Electrochemical Properties of the LiNi0.6Co0.2Mn0.2O2 Cathode Material Modified by Lithium Tungstate under High Voltage

Jiale Fu; Daobin Mu; Borong Wu; Jiaying Bi; Hui Cui; Hao Yang; Hanfeng Wu; Feng Wu

doi:10.1021/acsami.8b04167

Electrochemical Properties of the LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Material Modified by Lithium Tungstate under High Voltage

Jiale Fu, Daobin Mu^*, Borong Wu, Jiaying Bi, Hui Cui, Hao Yang, Hanfeng Wu, Feng Wu

^*Corresponding author for this work

School of Material Science and Engineering

Research output: Contribution to journal › Article › peer-review

62 Citations (Scopus)

Abstract

An amount (5 wt %) of lithium tungstate (Li₂WO₄) as an additive significantly improves the cycle and rate performances of the LiNi_0.6Co_0.2Mn_0.2O₂ electrode at the cutoff voltage of 4.6 V. The 5 wt % Li₂WO₄-mixed LiNi_0.6Co_0.2Mn_0.2O₂ 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 LiNi_0.6Co_0.2Mn_0.2O₂ cathode material is not affected by mixing Li₂WO₄. The introduced Li₂WO₄ effectively restrains the LiPF₆ and carbonate solvent decomposition by consuming PF₅ at high cutoff voltage, forming a stable cathode/electrolyte interface film with low resistance.

Original language	English
Pages (from-to)	19704-19711
Number of pages	8
Journal	ACS applied materials & interfaces
Volume	10
Issue number	23
DOIs	https://doi.org/10.1021/acsami.8b04167
Publication status	Published - 13 Jun 2018

Keywords

LiNiCoMnO cathode
high cut-off voltage
interface
lithium ion batteries
lithium tungstate

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Access to Document

10.1021/acsami.8b04167

Cite this

@article{4088ce5ba3834ff183b6345910edac8b,

title = "Electrochemical Properties of the LiNi0.6Co0.2Mn0.2O2 Cathode Material Modified by Lithium Tungstate under High Voltage",

abstract = "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 PF5 at high cutoff voltage, forming a stable cathode/electrolyte interface film with low resistance.",

keywords = "LiNiCoMnO cathode, high cut-off voltage, interface, lithium ion batteries, lithium tungstate",

author = "Jiale Fu and Daobin Mu and Borong Wu and Jiaying Bi and Hui Cui and Hao Yang and Hanfeng Wu and Feng Wu",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

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AU - Fu, Jiale

AU - Mu, Daobin

AU - Wu, Borong

AU - Bi, Jiaying

AU - Cui, Hui

AU - Yang, Hao

AU - Wu, Hanfeng

AU - Wu, Feng

PY - 2018/6/13

Y1 - 2018/6/13

N2 - 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 PF5 at high cutoff voltage, forming a stable cathode/electrolyte interface film with low resistance.

AB - 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 PF5 at high cutoff voltage, forming a stable cathode/electrolyte interface film with low resistance.

KW - LiNiCoMnO cathode

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KW - lithium ion batteries

KW - lithium tungstate

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