失效石墨负极的材料包覆修复技术研究进展

Progress of material coating repair technology for failed graphite anode

  • 摘要: 随着新能源汽车行业的快速发展,对大容量、高性能的电池需求量迅速上升,锂电池因其高能量密度、循环寿命长、低自放电率等优势在新能源汽车领域得到广泛应用。随着锂电池的大量使用,石墨负极的需求迅速上升。作为锂电池的关键组成部分,石墨凭借其低成本、高能量密度、优异的导电性和良好的循环稳定性成为了商业化锂电池中最主要的负极材料。然而,随着锂电池循环次数的增加,石墨负极表面会逐渐形成固体电解质(SEI)界面层和锂枝晶,导致石墨结构受损,电化学性能下降,这会导致大量的石墨资源浪费。为了实现石墨的可持续发展,我们需对失效石墨负极进行再生修复,再次投入试用。本文综述了材料包覆技术在修复失效石墨负极中的应用进展,介绍了失效石墨负极的除杂方法,着重介绍了沥青包覆修复、金属氧化物包覆修复和聚合物包覆修复这三种方法对失效石墨负极的修复作用。这些包覆技术能够有效修复失效石墨受损的结构,恢复其电化学性能。最后,本文提出了目前材料包覆技术所面临的挑战,并对未来研究方向提出了展望,以促进新能源电池产业的可持续发展。

     

    Abstract: With the rapid development of new energy automobile industry, the demand for large capacity, high performance battery is rising rapidly, lithium battery is widely used in new energy automobile field because of its high energy density, long cycle life, low self-discharge rate and other advantages. Accompanied by the large number of lithium batteries, the demand for graphite anode is rising rapidly. As a key component of lithium batteries, graphite has become the most dominant anode material in commercial lithium batteries by virtue of its lower cost, higher energy density, excellent electrical conductivity and good cycle stability. However, as the number of lithium battery cycles increases, solid electrolyte (SEI) interface layer and lithium dendrites will gradually form on the surface of graphite anode, leading to the damage of graphite structure and the decrease of electrochemical performance, which will lead to a large amount of wasted graphite resources. In order to achieve the sustainable development of graphite, we need to regenerate and repair the failed graphite anode and put it into trial again. In this paper, we review the progress of the application of material coating technology in the repair of failed graphite anode, we briefly introduce the decontamination methods of failed graphite anode, and then we focus on the repair of failed graphite anode by three methods, namely, asphalt coating repair, metal oxide coating repair and polymer coating repair. These coating techniques can effectively repair the damaged structure of the failed graphite and restore its electrochemical performance. Finally, this paper puts forward the challenges faced by the current material capping technology and puts forward an outlook on the future research direction to promote the sustainable development of the new energy battery industry.

     

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