Study on the storage performance of high-nickel NCM811 cathode materials
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 H3BO3 coating,water washing,and H3BO3 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-water-washed 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 H3BO3 coating presents novel insights for moisture management strategies.This research significantly contributes essential experimental data and theoretical foundations to reinforce the long-term stability and processing adaptability of high-nickel ternary cathode materials.
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