Abstract
Olivine-phosphate cathodes re-attract enormous attentions due to their excellent thermal stability when the electric vehicles encountered the various combusting accidents. In contrast to LiFePO
4
, lithium manganese iron phosphate is more promising cathode due to advantages of good safety and high-energy. Here, we reinvestigate the energy-output of LiMn
1-x
Fe
x
PO
4
/C (
x
= 0.05, 0.1, 0.15, 0.2, and 0.3) which is synthesized via the developed DMSO-assisted co-precipitation method. Among the synthesized samples, the energy density reaches the highest value using LiMn
0.8
Fe
0.2
PO
4
/C and then diminishes as Mn ratio further augmenting. Beside working as the individual cathode, the addition of 2% LiMn
0.8
Fe
0.2
PO
4
/C improves the cyclic stability of LiNi
0.88
Co
0.09
Al
0.03
O
2
electrodes from 77 to 88% after 100 cycles without sacrificing energy density. Obviously LiMn
0.8
Fe
0.2
PO
4
/C could be directly utilized as the individual cathode to replace LiFePO
4
and as the additive to improve the cyclic stability of Ni-rich cathodes.