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Research Article

Stable cycling of practical high-voltage LiCoO2 pouch cell via electrolyte modification

Chao Tang1,2,§, Yawei Chen1,§, Zhengfeng Zhang3,§, Wenqiang Li2, Junhua Jian2, Yulin Jie1, Fanyang Huang1, Yehu Han1, Wanxia Li1, Fuping Ai1, Ruiguo Cao1, Pengfei Yan3( ), Yuhao Lu2( ), Shuhong Jiao1( )
Hefei National Laboratory for Physical Science at Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Ningde Amperex Technology limited (ATL), Ningde 352100, China
Beijing Key Laboratory of Microstructure and Properties of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

§ Chao Tang, Yawei Chen, and Zhengfeng Zhang contributed equally to this work.

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Graphical Abstract

The electrochemical performance and the work mechanism of 1,3,6-hexanetricarbonitrile (HTCN) additive on high-voltage LiCoO2 cathode for practical pouch cells are comprehensively studied.

Abstract

Nitriles as efficient electrolyte additives are widely used in high-voltage lithium-ion batteries. However, their working mechanisms are still mysterious, especially in practical high-voltage LiCoO2 pouch lithium-ion batteries. Herein, we adopt a tridentate ligand-containing 1,3,6-hexanetricarbonitrile (HTCN) as an effective electrolyte additive to shed light on the mechanism of stabilizing high-voltage LiCoO2 cathode (4.5 V) through nitriles. The LiCoO2/graphite pouch cells with the HTCN additive electrolyte possess superior cycling performance, 90% retention of the initial capacity after 800 cycles at 25 °C, and 72% retention after 500 cycles at 45 °C, which is feasible for practical application. Such an excellent cycling performance can be attributed to the stable interface: The HTCN molecules with strong electron-donating ability participate in the construction of cathode-electrolyte interphase (CEI) through coordinating with Co ions, which suppresses the decomposition of electrolyte and improves the structural stability of LiCoO2 during cycling. In summary, the work recognizes a coordinating-based interphase-forming mechanism as an effective strategy to optimize the performance of high voltage LiCoO2 cathode with appropriate electrolyte additives for practical pouch batteries.

Keywords

LiCoO2high voltagenitrile additiveinterface adsorptionpouch cellelectrolyte modification

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Nano Research
Volume 16 Issue 3,
March 2023
Pages 3864-3871
DOI: 10.1007/s12274-022-4955-5
Cite this article:
Tang C, Chen Y, Zhang Z, et al. Stable cycling of practical high-voltage LiCoO2 pouch cell via electrolyte modification. Nano Research, 2023, 16(3): 3864-3871. https://doi.org/10.1007/s12274-022-4955-5
Topics:
Lithium batteries
Part of a topical collection:
Women’s Special Issue: Nanomaterials: Preparation, Applications, and ChallengesWomen’s special issuse in nanomaterials

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Received: 26 June 2022
Revised: 05 August 2022
Accepted: 24 August 2022
Published: 22 September 2022
© Tsinghua University Press 2022
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