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Energy, Environmental, and Catalysis Applications
Electrochemical properties of 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, and Feng Wu ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b04167 • Publication Date (Web): 23 May 2018 Downloaded from http://pubs.acs.org on May 23, 2018
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ACS Applied Materials & Interfaces
Electrochemical properties of LiNi0.6Co0.2Mn0.2O2 cathode material modified by lithium tungstate under high voltage Jiale Fu a, Daobin Mu a,*, Borong Wu a,b,*, Jiaying Bi a, Hui Cui a, Hao yang a, Hanfeng Wu c, Feng Wu a,b a
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing Key Laboratory of Environment Science and Engineering, Beijing 100081,China b
c
Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081,China
School of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China
*
Corresponding author: E-mail addresses:
[email protected] (D. Mu),
[email protected] (B. Wu).
Keywords: lithium tungstate; high cut-off voltage; LiNi0.6Co0.2Mn0.2O2 cathode; interface; lithium ion batteries Abstract An amount (5wt.%) of lithium tungstate (Li2WO4) as an additive significantly improves the cycle and rate performances of LiNi0.6Co0.2Mn0.2O2 electrode at the cut-off voltage of 4.6V. The 5wt.% Li2WO4-mixed LiNi0.6Co0.2Mn0.2O2 electrode delivers a reversible capacity of 199.2 mAhg-1 and keeps 73.1% capacity for 200 cycles at 1C. It retains 67.4% capacity after 200 cycles at 2C and delivers a discharge capacity of 167.3mAh g-1 at 10C, while those of the pristine electrode are only 44.7% and 87.5mAh g-1, respectively. It is shown that the structure of LiNi0.6Co0.2Mn0.2O2 cathode material is not affected by mixing Li2WO4. The introduced Li2WO4
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effectively restrains the LiPF6 and carbonate solvents decomposition by consuming PF5 at high cutoff voltage, forming a stable cathode/electrolyte interface film with low resistance. 1.
Introduction Layered LiNi1-x-yCoxMnyO2 (0
