高镍NCM811正极材料的储存性能研究  

Study on the storage performance of high-nickel NCM811 cathode materials

作　　者：苏柏涛 SU Baitao(Jiangmen Kanhoo Industry Co.,Ltd.,Jiangmen,Guangdong Province,529000,China)

机构地区：[1]江门市科恒实业股份有限公司,广东江门529000

出　　处：《电池工业》2024年第6期293-298,共6页Chinese Battery Industry

摘　　要：高镍三元正极材料凭借其卓越的能量密度优势,在商业应用中展现出广泛前景。随着镍含量(质量分数)的增加,虽然比容量得以提升,但材料的残碱量也随之增加,这对制浆加工性能及电池安全(如胀气问题)构成了挑战。本研究深入探讨了高镍三元正极材料及其典型改性方法,包括H_(3)BO_(3)包覆、水洗处理,以及水洗后再施以H_(3)BO_(3)包覆等,观察在大气暴露12天期间,残碱量、pH值及水分随时间的变化规律。研究结果显示,水洗后的高镍材料虽然残碱量得到很好的控制,但更易变质,而后续的包覆工艺有效抑制了这一退化趋势,说明了改性策略的实效性。值得注意的是,H_(3)BO_(3)包覆加速了材料的吸水速率,为水分调控策略带来了新的启示。本项工作为改善高镍三元正极材料的长期稳定性和加工适宜性提供了实验数据与理论支撑。High-nickel ternary cathode materials,benefiting from their remarkable energy density,exhibit a vastly promising landscape in commercial applications.As the nickel content(mass fraction)increases,although the specific capacity is enhanced,the residual alkalinity of the material also increases,posing challenges to slurry processing efficiency and battery safety,particularly regarding gas generation.This study delves into the in-depth analysis of high-nickel ternary cathode materials and several typical modification techniques,including H_(3)BO_(3) coating,water washing,and H_(3)BO_(3) coating after washing,examining the intricate temporal variations of residual lithium content,pH,and water content during a 12-day open-air exposure period.Findings reveal that although post-waterwashed high-nickel materials effectively manage residual lithium,they become more susceptible to degradation;however,succeeding coating procedures effectively inhibit this degradation,thereby validating the efficacy of modification strategies.Significantly,the accelerated water absorption induced by H_(3)BO_(3) coating presents novel insights for moisture management strategies.This research significantly contributes essential experimental data and theoretical foundations to reinforce the longterm stability and processing adaptability of high-nickel ternary cathode materials.

关 键 词：正极材料 包覆改性 高镍三元 水洗 储存性能 

分 类 号：TM911[电气工程—电力电子与电力传动]