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Electrochemical Properties of the LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> Cathode Material Modified by Lithium Tungstate under High Voltage

DOI

71

Citations

41

References

2018

Year

Jiale Fu, Daobin Mu, Borong Wu, Jiaying Bi, Hui Cui, Hao Yang, Hanfeng Wu, Feng Wu
ACS Applied Materials & Interfaces

Abstract

An amount (5 wt %) of lithium tungstate (Li<sub>2</sub>WO<sub>4</sub>) as an additive significantly improves the cycle and rate performances of the LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> electrode at the cutoff voltage of 4.6 V. The 5 wt % Li<sub>2</sub>WO<sub>4</sub>-mixed LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> electrode delivers a reversible capacity of 199.2 mA h g<sup>-1</sup> and keeps 73.1% capacity for 200 cycles at 1 C. It retains 67.4% capacity after 200 cycles at 2 C and delivers a discharge capacity of 167.3 mA h g<sup>-1</sup> at 10 C, while those of the pristine electrode are only 44.7% and 87.5 mA h g<sup>-1</sup>, respectively. It is shown that the structure of the LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> cathode material is not affected by mixing Li<sub>2</sub>WO<sub>4</sub>. The introduced Li<sub>2</sub>WO<sub>4</sub> effectively restrains the LiPF<sub>6</sub> and carbonate solvent decomposition by consuming PF<sub>5</sub> at high cutoff voltage, forming a stable cathode/electrolyte interface film with low resistance.

References

YearCitations

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