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摘要:
An amount (5 wt %) of lithium tungstate (Li2WO4) as an additive significantly improves the cycle and rate performances of the LiNi0.6Co0.2Mn0.2O2 electrode at the cutoff voltage of 4.6 V. The 5 wt % Li2WO4-mixed LiNi0.6Co0.2Mn0.2O2 electrode delivers a reversible capacity of 199.2 mA h g(-1)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(-1) at 10 C, while those of the pristine electrode are only 44.7% and 87.5 mA h g(-1), respectively. It is shown that the structure of the LiNi0.6Co0.2Mn0.2O2 cathode material is not affected by mixing Li2WO4. The introduced Li2WO4 effectively restrains the LiPF6 and carbonate solvent decomposition by consuming PF, at high cutoff voltage, forming a stable cathode/electrolyte interface film with low resistance.
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来源 :
ACS APPLIED MATERIALS & INTERFACES
ISSN: 1944-8244
年份: 2018
期: 23
卷: 10
页码: 19704-19711
9 . 5 0 0
JCR@2022
ESI学科: MATERIALS SCIENCE;
ESI高被引阀值:260
JCR分区:1