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Ultrahigh Capacity Retention of Li2ZrO3-Coated Ni-rich LNCM811 Cathode Material through Covalent Interfacial Engineering
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  • Zhangxian Chen,
  • Qiuge Zhang,
  • Weijian Tang,
  • Zhaoguo Wu,
  • Juxuan Ding,
  • Cheng Huang,
  • Zeheng Yang,
  • Weixin Zhang
Zhangxian Chen
Hefei University of Technology
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Qiuge Zhang
Hefei University of Technology
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Weijian Tang
Hefei University of Technology
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Zhaoguo Wu
Hefei University of Technology
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Juxuan Ding
Hefei University of Technology
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Cheng Huang
Hefei University of Technology
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Zeheng Yang
Hefei University of Technology
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Weixin Zhang
Hefei University of Technology
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Abstract

Nickel-rich LiNi0.8Co0.1Mn0.1O2 (LNCM811) is a promising lithium-ion battery cathode material, whereas the surface-sensitive issues (i.e., side reaction and oxygen loss) occurring on LNCM811 particles significantly degrade their electrochemical capacity retentions. A uniform Li2ZrO3 coating layer can effectively mitigate the problem by preventing these issues. Instead of the normally used weak hydrogen-bonding interaction, we present a covalent interfacial engineering for the uniform Li2ZrO3 coating on LiNi0.8Co0.1Mn0.1O2 materials. Results indicate that the strong covalent interactions between citric acid and Ni0.8Co0.1Mn0.1(OH)2 precursor effectively promote the adsorption of ZrO2 coating species on Ni0.8Co0.1Mn0.1(OH)2 precursor, which is eventually converted to uniform Li2ZrO3 coating layers of about 7 nm after thermal annealing. The uniform Li2ZrO3 coating endows LNCM811 cathode materials with an exceptionally high capacity retention of 98.7% after 300 cycles at 1 C. This work shows the great potential of covalent interfacial engineering for improving the electrochemical cycling capability of Ni-rich lithium-ion battery cathode materials.