Wang Xiaomei, Ruan Xiaopeng, Du Cheng-Feng, Yu Hong
State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University Xi'an, Shaanxi, 710072, P. R. China.
Northwestern Polytechnical University, Chongqing Technology innovation Center, Chongqing, 400000, P. R. China.
Chem Rec. 2022 Oct;22(10):e202200119. doi: 10.1002/tcr.202200119. Epub 2022 Jun 22.
Ni-rich layered cathodes with high energy densities reveal an enormous potential for lithium-ion batteries (LIBs), however, their poor stability and reliability have inhibited their application. To ensure their stability over extensive cycles at high voltage, surface/interface modifications are necessary to minimize the adverse reactions at the cathode-electrolyte interface (CEI), which is a critical factor impeding electrode performance. Therefore, this review provides a comprehensive discussion on the surface engineering of Ni-rich cathode materials for enhancing their lithium storage property. Based on the structural characteristics of the Ni-rich cathode, the major failure mechanisms of these structures during synthesis and operation are summarized. Then the existing surface modification techniques are discussed and compared. Recent breakthroughs in various surface coatings and modification strategies are categorized and their unique functionalities in structural protection and performance-enhancing are elaborated. Finally, the challenges and outlook on the Ni-rich cathode materials are also proposed.
具有高能量密度的富镍层状正极在锂离子电池（LIBs）中显示出巨大潜力，然而，它们较差的稳定性和可靠性限制了其应用。为确保其在高电压下长时间循环的稳定性，必须进行表面/界面改性，以尽量减少阴极-电解质界面（CEI）处的不良反应，这是阻碍电极性能的关键因素。因此，本综述对富镍正极材料的表面工程进行了全面讨论，以提高其锂存储性能。基于富镍正极的结构特征，总结了这些结构在合成和运行过程中的主要失效机制。然后对现有的表面改性技术进行了讨论和比较。对各种表面涂层和改性策略的最新突破进行了分类，并阐述了它们在结构保护和性能增强方面的独特功能。最后，还提出了富镍正极材料面临的挑战和展望。
