Electrodes were manufactured to a coat weight of 135 gsm and calendered to densities of 2.15 g cm -3 (LFP, LMFP60 and LMFP64), 1.8 cm -3 (LMFP80) and 2.4 g cm -3 (LMFP/NMC blend). Cross-sectional imaging of the electrodes (Figure ) revealed layers approximately 75 -85 µm thick. The LMFP60 electrode consisted of LMFP particles largely well dispersed with carbon black, although some larger agglomerates of ~ 10 µm were visible (higher magnification image shown in Figure ). Achieving desirable high densities with LMFP80 was more difficult, with cracking/delamination occurring when the density was increased beyond ~ 1.8 g cm -3 . This was attributed to the presence of pores within the large secondary particles (highlighted in Figure ). The blend electrode consisted of NMC811 particles interspersed with LMFP60. The addition of NMC811 enabled greater electrode density through both the higher material density of NMC811 (4.76 g cm -3 ) compared with LMFP60 (3.48 g cm -3 ), and the bimodal particle size, as the smaller LMFP60 particles pack pores between larger NMC811. EDS mapping of the blend electrode (Figure ) confirmed that NMC was present solely as large polycrystalline particles dispersed throughout the coating. Table : XRF analysis of pristine phosphate powders Full coin cells (utilising graphite as anode) were produced using the range of cathode materials. Full cell testing (as opposed to half-cell) with a suitable N:P ratio is critical in extracting meaningful performance data. Firstly, the effect of Mn-content in LMFP was examined. Figure shows the discharge voltage profiles of LFP (i.e. no Mn), along with LMFP of 3 grades (60 %, 64 % and 80 % Mn), when the cells were discharged at C/20. LFP exhibited a single discharge plateau at around 3.25 V, while the LMFP materials exhibited dual plateaus at 3.9 V and 3.3 V (relating to the Mn 2+/3+ and Fe 2+/3+ redox reactions, respectively ). While all cathodes provided roughly the same specific discharge capacity (144 +/-3 mAh g -1 ), the advantage of the higher Mn content is clear, whereby the upper plateau is extended at the expense of the lower, and the total area under the curve (the discharge energy) is thereby increased. The precise values for specific capacity and gravimetric energy density are provide in Figure . A Mn-content of 80 % provided an 18 % energy density advantage over LFP.