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Improvement of electrochemical performance of LiNi(0.8)Co(0.1)Mn(0.1)O(2)cathode material via Li2.09W0.9Nb0.1O4Li-ion conductive coating layer

Authors
  • Zhang, Xinghan
  • Ma, Fei
  • Wei, Guangye
  • Lei, Ze
  • Qu, Jingkui
Publication Date
Jun 30, 2020
Source
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
Keywords
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Abstract

Recently, niobium tungsten oxide has garnered considerable attention owing to its excellent Li-ion diffusion rate and prominent structural stability during charge-discharge cycles. Here, a cathode material (LiNi0.8Co0.1Mn0.1O2, NCM811) for Li-ion batteries is successfully coated with Li-ion conductive Li(2.09)W(0.9)Nb(0.1)O(4)using a simple wet-chemical coating method followed by high-temperature sintering. A physicochemical phase analysis reveals that a 4-5-nm-thick coating with a Li(2.09)W(0.9)Nb(0.1)O(4)crystal structure is evenly distributed on the surface of the cathode particles. Among cathodes coated with different amounts of material, the one coated with 0.5 wt% Li(2.09)W(0.9)Nb(0.1)O(4)yielded the best overall performance, with a high discharge capacity of 136.8 mAh g(-1)at 10 C and long-term cycling stability with a capacity retention of 91.7% after 100 cycles at 1 C. This excellent electrochemical performance can be attributed to the coating's ability to prevent the impedance from increasing and the Li-ion diffusion coefficient from decaying. In addition, it protects the cathode from side reactions and stabilizes the structure during cycling.

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