Wu Yingqiang, Li Mengliu, Wahyudi Wandi, Sheng Guan, Miao Xiaohe, Anthopoulos Thomas D, Huang Kuo-Wei, Li Yangxing, Lai Zhiping
Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Core Labs, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
ACS Omega. 2019 Aug 19;4(9):13972-13980. doi: 10.1021/acsomega.9b01706. eCollection 2019 Aug 27.
A simple and low-cost polymer-aided sol-gel method was developed to prepare γ-AlO protective layers for LiNiCoMnO (NCM622) cathode materials. The selected polyvinyl alcohol polymer additive not only facilitates the formation of a uniform and thin γ-AlO layer on the irregular and rough cathode particle surface to protect it from corrosion but also serves as a pore-forming agent to generate micropores in the film after sintering to allow fast transport of lithium ions, which guaranteed the excellent and stable battery performance at high working voltage. Detailed studies in the full battery mode showed that the leached corrosion species from the cathode had a more profound harmful effect to the graphite anode, which seemed to be the dominating factor that caused the battery performance decay.
开发了一种简单且低成本的聚合物辅助溶胶-凝胶法，用于制备用于LiNiCoMnO（NCM622）正极材料的γ-AlO保护层。所选的聚乙烯醇聚合物添加剂不仅有助于在不规则且粗糙的正极颗粒表面形成均匀且薄的γ-AlO层，以保护其免受腐蚀，还作为造孔剂在烧结后在薄膜中产生微孔，以允许锂离子快速传输，这保证了在高工作电压下优异且稳定的电池性能。全电池模式下的详细研究表明，从正极浸出的腐蚀物质对石墨负极有更严重的有害影响，这似乎是导致电池性能衰减的主要因素。
