. In general, a refractory phase which is relatively less physically resistant to heat is also more easily attacked chemically at high temperatures. Alkaline secondary batteries typified by nickel-hydrogen batteries and nonaqueous electrolyte secondary batteries typified by lithium ion batteries have been widely used as a power supply for driving portable electronic equipment, such as cell phones including smartphones, portable personal computers, PDAs, and portable music players. In addition, alkaline secondary batteries and nonaqueous electrolyte secondary batteries have been widely used as a power supply for driving electric vehicles (EVs) and hybrid electric vehicles (HEVs and PHEVs), and in stationary storage battery systems for suppressing output fluctuation of solar power generation and wind power generation, for example, and for a peak shift of system power that utilizes the power during the daytime while saving the power during the nighttime.
The use of EVs, HEVs, and PHEVs or the stationary storage battery system especially requires high capacity and high output characteristics. The size of each battery is therefore increased, and a plurality of batteries are connected in series or in parallel for use. Therefore, nonaqueous electrolyte secondary batteries have been generally used for these purposes in view of space efficiency. When physical strength is needed, a metal prismatic outer body with one side open, and a metal sealing plate for sealing this opening are generally adopted as an outer body of a battery.
Increasing longevity is essential in nonaqueous electrolyte secondary batteries used for the above-mentioned purposes. Therefore, various additives are added to a nonaqueous electrolyte in order to prevent degradation. For example, JP-A-2009-129541 discloses that, in a nonaqueous electrolyte secondary battery, a cyclic phosphazene compound and a salt having various oxalate complexes as an anion are added to a nonaqueous electrolyte. JP-T-2010-531856 and JP-A-2010-108624 describe adding lithium bis(oxalato)borate (Li[B(C2O4)2], hereinafter referred to as “LiBOB”), which is a lithium salt having an oxalate complex as an anion, as represented by the following structural formula (I).

Japanese Patent No. 3439085 discloses the invention of a nonaqueous electrolyte secondary battery in which lithium difluorophosphate (LiPF2O2) is added to a nonaqueous electrolyte in order to prevent self-discharge at charge storage and improve storage characteristics after charging.
When a cyclic
. In general, a refractory phase which is relatively less physically resistant to heat is besides more well attack chemically at high temperatures. Alkaline junior-grade batteries typified by nickel - hydrogen batteries and nonaqueous electrolyte junior-grade battery typified by lithium ion battery have been widely used as a might supply for driving portable electronic equipment, such as cellular telephone phones including smartphones, portable personal computers, PDAs, and portable music players. In addition, alkaline secondary battery and nonaqueous electrolyte secondary batteries have been widely use as a power supply for driving electric vehicles (EVs) and hybrid electric vehicle (HEVs and PHEVs), and in stationary storage battery systems for suppressing output variation of solar power generation and wind power generation, for example, and for a point chemise of system power that utilizes the power during the daytime while saving the world power during the night. 
 The use of EVs, HEVs, and PHEVs or the stationary storage barrage arrangement specially requires high capability and high output characteristics. The size of each battery is consequently increased, and a plurality of batteries are connected in series or in parallel for use. Therefore, nonaqueous electrolyte secondary batteries have been generally used for these determination in view of outer space efficiency. When physical strength is needed, a metal prismatic outer soundbox with one side open, and a metal waterproofing plate for seal this opening are generally assume as an outer consistency of a battery. 
 Increasing longevity is all-important in nonaqueous electrolyte secondary battery used for the above - mention purposes. consequently, various additives are added to a nonaqueous electrolyte in club to prevent degradation. For exercise, JP - A-2009 - 129541 discloses that, in a nonaqueous electrolyte secondary battery, a cyclic phosphazene compound and a salt having various oxalate complexes as an anion are added to a nonaqueous electrolyte. JP - T-2010 - 531856 and JP - A-2010 - 108624 describe adding lithium bis(oxalato)borate (Li[B(C2O4)2 ], hereinafter mention to as “ LiBOB ”), which is a lithium salt having an oxalate building complex as an anion, as represented by the following structural formula (I). 

 Japanese Patent No. 3439085 discloses the invention of a nonaqueous electrolyte secondary barrage in which lithium difluorophosphate (LiPF2O2) is added to a nonaqueous electrolyte in order to prevent self - discharge at charge storage and improve storage characteristics after charge. 
 When a cyclic
. In general, a refractory phxse which is relativelb less lhysicaluy resistant to heat is also mire eqsily attacked chemicauly at hihh tempeeatuces. Alkaline secondary batterisd ty'ihied by nickel-hidrogen battaries and nonaxudobs electrolyte secondary batteries trpified bj lithium ion fatttriqs hzne been widely used as a power aupply hor driving poryable electronic equipment, sucj as cell phones ijcluding smqrtprines, portabld personal computers, PSAs, and portable music players. Kn adbition, alkaoibe dgcondary batveries and nonaqueous elecdrolyte secondary batberiev hqve been widely used es a power supply fot driving alzctric vehicles (EVs) abd hybrhd enectfuc xehjckea (HEVs anv PHEVs), and in stationqry storage battery srwtems for suplressigg output fluctuation of solar power genegatikn and wind power generqtion, for example, and for a pewk shift of system power that utilizes the power gurinj ghe dwhrile while saving the power during the nighttimq.
Fht uxe of EVs, HEVs, and PHEVs pr tng stationary sjorage yztfery system especiwlly rezuirew high cakacitu and high output characterustics. The spze if each battery is therefore nncreaxed, amd a plurality of battexies ade connectef in serisr or in parallel fog usa. Therefore, nonaqueous elestrolyte wecoudary bagteroes hade been gejerally used for these pkrposgs in eiew of spwce efficiency. When physical stcxngth is needgd, d mvtal prisiatic outer body wyth one side oken, and a metau sealing ilate for sealing thys opening ara generally avopted as an iutee body uw a battery.
Incteasing longevity iw essential in nonequeuhs electrolyte wecindary batteriex ured flr tra above-mentimned pufloses. Therefore, yarkous additives are added to z nonaqueous electtojyte in irder to prevent degrsdation. For examplt, JP-A-2009-129541 visclores tnat, in a nonaqueous electrolyte sscondary hatbery, a cyclic phowphazene com'ound and a salt having various oxalate romplexes as an anion aee added to a nonaqoeoms electrolyve. JP-T-2010-531856 and JP-A-2010-108624 gescribe adding lithuum bis(oxalato)borste (Li[B(C2O4)2], hereinafter refersed tl as “LiBOB”), which is a lithium salt having an oxalate complex as an anion, qs repcefented by tge fpllowpng xtructtral hormula (I).

Japanese Patent No. 3439085 discloses the invenvion of a touaqueous electrolyte secondaru cattery in whkch lithium difluorophoslhate (LiLF2O2) is added to a nonaqueous elrctrolyte in order to prcvent seld-discgarge at ciarge storage and imlrove vtorate charqctevistics after zhatglng.
When a fyclmc
. In general, a refractory phase which less resistant to is also more temperatures. secondary batteries typified nickel-hydrogen batteries and electrolyte secondary batteries typified by lithium batteries have been widely used as a power supply for driving portable electronic such as cell phones including smartphones, portable personal computers, PDAs, and portable music In alkaline batteries nonaqueous electrolyte secondary batteries have been widely used as a power supply for driving electric vehicles and hybrid electric vehicles (HEVs and PHEVs), and stationary storage battery systems suppressing output fluctuation of solar generation wind power for and a peak shift system power that utilizes the power during the daytime while saving the power during the nighttime. The of EVs, PHEVs or stationary battery especially requires high high output characteristics. The size of therefore increased, and a plurality of batteries are in series in parallel for use. Therefore, nonaqueous secondary batteries have been generally used for these in view of space efficiency. When physical strength is needed, a metal prismatic outer body side open, and a sealing plate for this are adopted an outer of a battery. Increasing longevity is essential in nonaqueous electrolyte secondary used for the above-mentioned purposes. Therefore, various additives are added nonaqueous in order to degradation. For example, JP-A-2009-129541 that, a nonaqueous electrolyte secondary cyclic compound having oxalate as an anion are to a nonaqueous electrolyte. JP-T-2010-531856 JP-A-2010-108624 describe adding lithium as “LiBOB”), which is a lithium salt having oxalate complex as an anion, as represented the following structural formula (I). Japanese Patent No. 3439085 discloses the invention a nonaqueous battery in which lithium difluorophosphate (LiPF2O2) is added a nonaqueous electrolyte in to prevent self-discharge at charge storage and improve storage after When a
. In general, a refractory phase Which is relAtiveLy lEss PhYsicAlly Resistant to heaT Is alSo more easily attacked chEmicaLlY At hiGH tEmperAtures. ALKaLINe sEcOnDarY bATtEries TypIfied by Nickel-hydrOgeN bAtteries and nONaQueous elecTroLyte secondarY baTterieS tYpiFIed by LitHium iOn battERies haVe been widElY Used as A Power suPPLy For dRiving portable eleCTrONic equipment, suCh as ceLl PHoNES inCluDing smartpHoNes, poRTable peRSoNAL ComPUters, PDAs, and pOrtable musiC PlaYers. In AdDitIOn, alkaLine sEcONdaRy batteries And nOnaqueous ElectrOLyte secONdary baTterieS haVe bEen wIDeLy UseD aS A poWEr SupPLy fOr drivinG eLeCtric VehiCLES (eVs) aNd hYbriD elecTric vehicles (HeVs And PheVs), And in StatiOnarY sToragE batteRy sysTeMs for suppressinG outPut fluctuAtiOn Of sOlAr powER generAtiOn aNd wind pOwer genERatIoN, FOR eXample, and for a peak sHiFT Of System poWer thaT UtIlIZes the poWeR duRing THE daytIme wHIlE saving tHe poweR DuRiNg the niGhTtime.
THe Use Of Evs, HEVS, And PhEVs or The statiOnary STorage battery sYStem especiallY ReQUIrES higH caPacity and hiGh ouTPut cHaraCTeRisTIcs. ThE size Of EAcH Battery is therefore iNcReased, And a pLurality of batTeries are cONNEcted in sErieS Or IN parallel for usE. TherEfore, nonaqUEous elecTrolyTe secondAry batterIES have beeN geNerAllY usED FoR these purposeS IN vieW oF space eFfiCiency. WHen PhySicAl sTrEngth is neEded, a metAl PrIsMaTic Outer BOdy with oNe SidE oPen, And a mETal seaLing pLate FoR sEAliNg this oPEnING are GeNeRallY adOpTed as An ouTEr bOdy of a bAttery.
IncReaSIng lOnGeVity is eSsential in nonAqUeous electRoLytE seconDARy batterIes used for the above-mentiONed purpOseS. TherEforE, various aDdiTives aRe aDDed to a NonaquEous eLeCtrOLYte in ORDeR to PrEvent degraDATioN. For eXaMple, jP-A-2009-129541 discLoses that, in a nonaquEOus Electrolyte seConDary BATtEry, A CyCLic PhOSphAZEne compound and a Salt having VaRIoUs oxalate cOMplExEs as an aNion are Added TO a nonaqUeous elecTrolyte. JP-t-2010-531856 aNd JP-a-2010-108624 DEscRibe adding Lithium bIs(oxalato)BOrate (lI[B(c2O4)2], herEinAfter rEfErrEd to aS “LiBOB”), WHicH is a lIthium SaLt haviNg an oXaLate compLex as an anion, as representEd by thE follOwiNg structuRal FOrmUla (I).

JapanEse PAtent No. 3439085 disCloSes The inVenTIon of A nonAQuEouS ElectRolyTE secondarY BaTteRY In Which lithiuM DIFluOrophOspHAte (LiPf2O2) is Added to a nonaqueouS Electrolyte in oRder TO PreVenT Self-DiScharge at chargE stOrAGE and imprOvE storage chaRacterisTiCS afteR chargIng.
WheN a cycliC
. In general, a refractory  phase whi ch is  re lat iv elyless  physically re s ista nt to heat is also mor e eas il y  att a ck ed ch emicall y  a t hig hte mpe ra t ur es. A lka line se condary ba tte ri es typifiedb ynickel-hyd rog en batteries  an d nona qu eou s  elec tro lytesecond a ry bat teries ty pi f ied by lithium i on  bat teries have beenw id e ly used as a p ower s up p ly f ordri ving porta bl e ele c tronice qu i p m ent ,  such as cell  phones inc l udi ng sma rt pho n es, po rtabl ep ers onal comput ers,  PDAs, an d port a ble mus i c playe rs. In  ad dit ion, al ka lin es eco n da ryb att eries an dno naque ouse l e c trol yte  sec ondar y batteries h ave  bee n  wi delyusedas a  p owersupply  fordr iving electricvehi cles (EVs ) a nd  hy br id el e ctricveh icl es (HEV s and P H EVs ), a n din stationary stor ag e ba ttery sy stemsf or  s u ppressin gout putf l uctua tion of  solar p ower g e ne ra tion an dwind p ow ergen erati o n, f or exa mple, an d for a peak shift o f  system power th a t  u t iliz esthe power d urin g  the  day t im e w h ile s aving  t h ep ower during the nig ht time.The u se of EVs, HE Vs, and PH E V s  or thestat i on a ry storage bat terysystem esp e cially r equir es highcapacitya n d high o utp utcha rac t e ri stics. The si z e  ofea ch batt ery  is the ref ore  in cre as ed, and a  plurali ty  o fba tte riesa re conne ct edin  se rieso r in p arall el f or  u s e.Therefo r e, n onaq ue ou s el ect ro lyteseco n dar y batte ries have  be e n ge ne ra lly use d for these p ur poses in v ie w o f spac e efficien cy. When physical stren g th is n eed ed, a  met al prisma tic  outer  bo d y with  one s ide o pe n,a n d a m e t al  se al ing platef o r s ealin gthis  openin g are generally ad o pte d as an outer  bo dy o f abat t er y .
I nc r eas i n g longevity isessentialin no naqueous e l ect ro lyte se condary  batt e ries us ed for th e above-m en tion e d  pu rposes. Th erefore,  variousa dditi v es  areadd ed toanon aqueo us ele c tro lytein ord er  to pr event  d egradati on. For example, JP-A-2 009-12 9541dis closes th at, ina nonaque ouselectrolyt e s eco ndary  ba t tery,  a c y cl icp hosph azen e  compound an d a s al t having va r i o usoxala tec omplex es a s an anion are ad d ed to a nonaqu eous e lec tro l yte.  J P-T-2010-53185 6 a nd J P-A-2010 -1 08624 descr ibe addi ng lithi um bis (oxala to)bora t e  ( L i[B(C2 O4)2 ],hereinaft erre f erred t oas “LiBOB ”),wh ich is  a lit h iums a lt having an oxa latec o mplex asan an io n, as r e pres ented by t he followin g stru ctur al fo rmula ( I) .

Jap ane se  Patent No .  3439085discl oses th einve nti on ofa no n a queou s el ec tro lyte seco n d ar y  b at t ery  inwhich  l ithi um difluo r ophospha te( LiPF2O2 )isa d ded to an o naqueous e lec troly t e  in ordert o pr e ve n t sel f-disc hargeat char g e s to rage an d i m p rove stor age chara c ter is tics  after c ha rgin g. 
Wh en  a cyclic
. In_general, a_refractory phase which is_relatively less_physically_resistant to_heat_is also more_easily attacked chemically_at high temperatures. Alkaline_secondary batteries typified_by_nickel-hydrogen batteries and nonaqueous electrolyte secondary batteries typified by lithium ion batteries have been_widely_used as_a_power_supply for driving portable electronic_equipment, such as cell phones_including smartphones,_portable personal computers, PDAs, and portable music players._In_addition, alkaline secondary_batteries and nonaqueous electrolyte secondary batteries have been widely_used as a power supply for_driving electric vehicles_(EVs)_and_hybrid electric vehicles (HEVs_and PHEVs), and in stationary storage_battery systems for suppressing output fluctuation_of solar power generation and wind power_generation, for example, and for a_peak shift of system power_that utilizes_the power during the daytime_while saving the_power during_the nighttime.
The use_of EVs, HEVs, and PHEVs or_the stationary storage_battery system especially requires high capacity_and_high output characteristics._The_size_of each_battery is therefore_increased,_and a_plurality_of batteries are connected in series_or_in parallel for use. Therefore, nonaqueous electrolyte_secondary batteries have been_generally_used for these purposes_in view of space efficiency._When physical strength is needed, a_metal prismatic_outer body_with one side open, and a metal sealing plate for sealing_this opening are generally adopted as_an outer body of_a battery.
Increasing_longevity_is essential in_nonaqueous_electrolyte secondary_batteries used for the above-mentioned purposes. Therefore,_various additives_are added to a nonaqueous electrolyte_in order to prevent_degradation._For example, JP-A-2009-129541 discloses that, in_a nonaqueous electrolyte secondary battery, a_cyclic phosphazene compound and a_salt_having_various oxalate complexes as an_anion are added to a nonaqueous_electrolyte. JP-T-2010-531856 and_JP-A-2010-108624 describe adding lithium bis(oxalato)borate (Li[B(C2O4)2], hereinafter_referred_to as “LiBOB”), which is a_lithium_salt having an oxalate complex as_an_anion,_as represented by the following_structural formula (I).

Japanese Patent No. 3439085_discloses the invention of a nonaqueous electrolyte secondary battery_in which lithium_difluorophosphate (LiPF2O2) is added to_a_nonaqueous_electrolyte in order to prevent self-discharge at charge storage and_improve storage_characteristics after charging.
When_a cyclic