Significant research efforts have been dedicated to enhancing the ionic conductivity in Lithium Super Ionic Conductors (LISICONs). In 1978, Hong identified poor ionic conductivity (10 -7 S cm -1 at ambient temperature) in Li 14 Zn(GeO 4 ) 4 and related materials such as Li 4 GeO 4 -LiVO 4 , Li 2+2x Zn 1-x GeO4, Li 2 O-V 2 O 5 -SiO 2 , and Li 4 SiO 4 -Li 3 PO 4 , which were synthesized around the same period and exhibited slightly improved ionic conductivity . However, a significant breakthrough in lithium-ion (Li + ) conductivity was achieved when Kamaya et al. discovered a material with ionic conductivity reaching 10 -2 S cm -1 at RT, surpassing that of liquid organic electrolytes.