Libf4 Induced Unique Surface Modification Enables Improved Electrochemical Performance of Lini0.8co0.1mn0.1o2 Cathode

31 Pages Posted: 19 Jan 2023

See all articles by Xiaolin Zhou

Xiaolin Zhou

Guilin University of Technology

Sihan Li

affiliation not provided to SSRN

Ze Feng

Central South University

Shan Zhang

affiliation not provided to SSRN

Xin Fan

Guilin University of Technology

Dan Sun

Central South University

Huanhuan Li

affiliation not provided to SSRN

Yougen Tang

Central South University

Haiyan Wang

Central South University

Abstract

LiNi0.8Co0.1Mn0.1O2 (NCM811) has been regarded as a potential cathode material for next-generation lithium-ion batteries. However, the electrochemical performance of this material is severely affected by structural deterioration and capacity degradation, and the residual lithium is one of the main culprits. Herein, we propose an effective strategy to design ultrathin coatings on the surface of NCM811 by using LiBF4 as the precursor. The homogeneous hybrid LiF-Li2B4O7 coating layers can be obtained due to the reaction between LiBF4 and the residual lithium, which not only can effectively reduce the residual lithium, but also improve interfacial lithium-ion diffusion kinetics and suppress side reactions. Accordingly, the LiBF4-modified samples exhibited significantly improved electrochemical performance. The coated sample of NCM811@LBF-0.7 delivers the 127.1 mAh g−1 discharge capacity with 69.8% capacity retention even after 300 cycles at 1C. While the pristine sample only shows 97.1 mAh g−1 and the capacity retention decreases to 31.0%. This method provides a simple and effective strategy to extend the service life and safety characteristics of high-energy-density lithium-ion batteries.

Keywords: LiNi0.8Co0.1Mn0.1O2, Electrochemical performance, LiBF4, coating layer, lithium-ion batteries

Suggested Citation

Zhou, Xiaolin and Li, Sihan and Feng, Ze and Zhang, Shan and Fan, Xin and Sun, Dan and Li, Huanhuan and Tang, Yougen and Wang, Haiyan, Libf4 Induced Unique Surface Modification Enables Improved Electrochemical Performance of Lini0.8co0.1mn0.1o2 Cathode. Available at SSRN: https://ssrn.com/abstract=4329619 or http://dx.doi.org/10.2139/ssrn.4329619

Xiaolin Zhou

Guilin University of Technology ( email )

Guilin 541004
China

Sihan Li

affiliation not provided to SSRN ( email )

No Address Available

Ze Feng

Central South University ( email )

Changsha, 410083
China

Shan Zhang

affiliation not provided to SSRN ( email )

No Address Available

Xin Fan

Guilin University of Technology ( email )

Guilin 541004
China

Dan Sun

Central South University ( email )

Huanhuan Li

affiliation not provided to SSRN ( email )

No Address Available

Yougen Tang

Central South University ( email )

Changsha, 410083
China

Haiyan Wang (Contact Author)

Central South University ( email )

Changsha, Hunan 410083
China

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