储能科学与技术

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钠离子电池正极预钠化技术进展

李昱1(), 李丹丹2, 谢飞1(), 唐彬2, 容晓晖1,2, 梁沁沁2, 胡勇胜1()   

  1. 1.中国科学院物理研究所,北京 100190
    2.广西电力装备智能控制与运维重点实验室,广西电网有限责任公司电力科学研究院,广西,南宁,530023
  • 收稿日期:2024-11-19 修回日期:2024-11-25
  • 通讯作者: 谢飞,胡勇胜 E-mail:3510709270@qq.com;fxie@iphy.ac.cn;yshu@iphy.ac.cn
  • 作者简介:李昱(1998—),男,博士研究生(在读),研究方向为钠离子电池界面,E-mail:3510709270@qq.com
  • 基金资助:
    国家重点研发计划项目(2022YFB2402500);国家自然科学基金项目(22339001);广西电网电力科学研究院科技项目(GXKJXM20210260)

Recent progress of cathode presodiation strategies in sodium ion batteries

Yu Li1(), Dandan Li2, Fei Xie1(), bin Tang2, Xiaohui Rong1,2, Qinqin Liang2, Yongsheng Hu1()   

  1. 1.Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    2.Guangxi Key Laboratory of intelligent Control and Maintenance of Power Equipment, Electric Power Research Institute of Guangxi Power Grid Co. , Ltd. , Nanning 530023, Guangxi, China
  • Received:2024-11-19 Revised:2024-11-25
  • Contact: Fei Xie, Yongsheng Hu E-mail:3510709270@qq.com;fxie@iphy.ac.cn;yshu@iphy.ac.cn

摘要:

钠离子电池凭借原材料来源广泛、成本低廉等优势,被视作下一代非常重要的电化学储能技术。预钠化技术可通过引入额外的钠源,对首周充电时因生成界面而不可逆消耗的钠离子进行有效补充,进而有效提升电池的循环寿命与能量密度,在钠离子电池实际生产应用中具有重要价值。预钠化技术主要分为负极预钠化技术和正极预钠化技术,正极预钠化技术里的自牺牲型补钠剂预混法,因其操作简便,无需额外增添设备,有利于大规模推广。本文首先简单介绍了补钠剂的分类,然后梳理了这一方法在实际生产应用过程中存在的问题,具体涵盖生产储存环节的安全性与稳定性问题、电极制造过程中补钠剂的碱性以及粒径大小的问题,还有电池循环时分解电位过高、分解产物及其分解后对极片产生的影响等问题。随后本文归纳了近年来预钠化相关文献与专利中对应的解决方案,还对这一方法在无负极钠电池中的应用情况作了介绍。最后,本文对未来补钠剂的开发提出了相应的设计原则,并有望为正极预钠化技术的应用提供一定的指导与启发。

关键词: 钠离子电池, 预钠化, 自牺牲型补钠剂, 专利分析

Abstract:

Sodium-ion batteries are regarded as one of the crucial next-generation electrochemical energy storage technologies due to the advantages such as the wide availability of raw materials and low cost. The presodiation technique can effectively replenish the sodium ions that are irreversibly consumed due to the formation of the interface during the first-cycle charging by introducing an additional sodium source, and thus can effectively improve the cycle life and energy density of the batteries. It holds significant value in the practical production and application of sodium-ion batteries.The presodiation technique is mainly divided into anode presodiation technique and cathode presodiation technique. The self-sacrificial sodium supplement agent pre-mixing method within the cathode presodiation technique, due to its simple operation and without the necessity of adding extra equipment, is conducive to large-scale promotion. This article first briefly introduces the classification of sodium supplement agents. Then, it sorts out the problems existing in the practical production and application process of the self-sacrificial sodium supplement agent pre-mixing method. Specifically, these problems cover the safety and stability issues in the production and storage stage, the alkalinity and particle size aspects of the sodium supplement agent in the electrode manufacturing process, as well as issues such as excessive decomposition potential during battery cycling, decomposition products and their impacts on the electrode sheet after decomposition. Subsequently, this article summarizes the corresponding solutions in the presodiation-related literature and patents in recent years. Moreover, it also presents an introduction to the application of this method in anode-free sodium-metal batteries. Finally, this article puts forward corresponding design principles for the future development of sodium supplement agents and is expected to provide certain guidance and inspiration for the application of the cathode presodiation technique.

Key words: Sodium-ion batteries, Presodiation, Self-sacrificial sodiation supplement agents, Patent analysis

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