Study on Electro-Chemical Properties of LiMn0.6Fe0.4PO4 Coated by Linear-Surface Dimension Carbon Mixed with Low-Cobalt NCM
The lithium-ion battery LiFePO4 has approached the limit energy-density.To increase the energy density,reduce the cost of battery and meet the needs of consumers,a low-cost,high-energy-density material needs to be developed.LiMn0.6Fe0.4PO4 has both the long-cycle capability of LiFePO4 and the high-voltage platform characteristics of LiMnPO4,which can well combine the advantages of LiMnPO4 and LiFePO4.The theoretical capacity of lithium both are 172 mAh/g,but the electrode potential of LiMnPO4 relative to Li+/Li is 4.1 V,which is much higher than 3.2V of LiFePO4,and its energy density is 15％higher than that of LiFePO4.However,LiMn0.6Fe0.4PO4 has poor cycling performance because of Mn Dissolution,and its conductivity is low,and the low-temperature performance is deteriorated seriously.In order to improve the cycling and low-temperature performance,it is necessary to modify LiMn0.6Fe0.4PO4.In this paper,LiMn0.6Fe0.4PO4 is coated by linear-surface dimension carbon,and mixed with NCM of low-cobalt to achieve long cycle,high low-temperature capacity retention,without double-voltage platform of excellent electro-chemical performance.
LiMn0.6Fe0.4PO4NCMcoating with Ccycle performancelow-temperature performance
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