Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (7): 2119-2133.doi: 10.19799/j.cnki.2095-4239.2023.0212

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Mechanisms of gas evolution and suppressing strategies based on the electrolyte in lithium-ion batteries

Chong XU(), Ning XU, Zhimin JIANG, Zhongkai LI, Yang HU, Hong YAN, Guoqiang MA()   

  1. Zhejiang Chemical Industry Research Institute Co. Ltd. , Hangzhou 310023, Zhejiang, China
  • Received:2023-04-10 Revised:2023-05-20 Online:2023-07-05 Published:2023-07-25
  • Contact: Guoqiang MA E-mail:xuchong01@sinochem.com;maguoqiang@sinochem.com

Abstract:

Rapid development of portable devices, electric vehicles, and energy storage power stations has led to the increasing need of optimizing the cost, cycling life, charging time, and safety of lithium-ion batteries (LIBs). Gas generation during cycling and storage causes volume expansion and electrode/separator dislocation, which can increase electrochemical polarization and lead to decreased battery lifespan or safety hazards. Herein, we summarize the mechanisms with respect to the primary gases that evolve in LIBs, including oxygen, hydrogen, alkenes, alkanes, and carbon oxide, and describe the effect of operating temperature, voltage window, and electrode materials on gas generation. We also describe the relationship between this gas generation and LIB performance. We further propose several electrolyte-based strategies that focus on increasing the stability of the electrolyte and electrode/electrolyte interface. Specifically, the electrolyte stability is increased by employing functional additives to scavenge trace water, hydrofluoric acid, and active oxygen species, reducing the proportion of cyclic carbonates, and by using fluorinated solvents in the electrolyte. The adoption of film-forming additives can effectively improve the stability of the electrode/electrolyte interface, suppressing gas generation. In addition, we discuss the challenges and urgent issues related to gas generation in LIBs and provide unique perspectives on the intrinsic mechanism for developing increasingly efficient gas-suppression methods.

Key words: gas evolution, suppressing strategies, additives, electrolyte, lithium-ion batteries

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