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高容量的富镍层状氧化物是二次锂基电池系统中很有前途的正极材料。然而，其较差的离子导电性和电极/电解液界面处的副反应导致其倍率和循环性能不理想。本文利用离子导电率优异的二维材料g-C_3N4对富镍材料LiNi0.9Co0.05Mn0.05O2实现均匀包覆，包覆层g-C_3N4可有效抑制富镍材料寿命过程中的结构退化和晶间裂纹，并阻止活性材料与电解液的直接接触，从而稳定电极/电解液界面，防止副反应的发生。此外，g-C_3N4的包覆增强了表观锂离子扩散系数方面的锂脱/嵌动力学，所合成的包覆材料在3～4.5 V、1 C下循环200次后的容量高达175.2 mAh/g,而在5 C下仍能获得154.3 mAh/g的可逆容量，大大优于未包覆材料性能表现。本研究为构建具有优异综合性能的高镍三元金属氧化物正极超薄界面层提供了新思路。
Abstract：High-capacity nickel-rich layered oxides are promising cathode materials for secondary lithium-based battery systems.However, its poor conductivity and side reactions at the electrode/electrolyte interface lead to unsatisfactory rate and cycle performance.Herein, the two-dimensional material g-C_3N4 with excellent conductivity is used to uniformly coat the nickel-rich material LiNi0.9Co0.05Mn0.05O2.The coating g-C_3N4 can effectively inhibit the structural degradation and intergranular cracks during the life of nickel-rich materials, and physically prevent the direct contact between the active material and the electrolyte, thereby stabilizing the electrode/electrolyte interface and preventing the occurrence of harmful side reactions.In addition, the coating of g-C_3N4 enhances the lithium deintercalation/intercalation kinetics in terms of apparent lithium ion diffusion coefficient.The synthesized coated material has a capacity of up to 175.2 mAh/g after 200 cycles at 1 C in the voltage range of 3～4.5 V,and can still obtain a reversible capacity of 154.3 mAh/g at 5 C,which is much better than the performance of the uncoated material.This work sparks new ideas on constructing ultra-thin interface layers with excellent comprehensive performance for high-nickel ternary-metal oxide cathodes.
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基本信息:
DOI：10.19996/j.cnki.ChinBatlnd.2024.03.004
中图分类号:TM912;TB34
引用信息:
[1]段振亮,邱祥云,郭向欣.氮化碳包覆LiNi_(0.9)Co_(0.05)Mn_(0.05)O_2正极用于高能量密度和长寿命锂电池[J].电池工业,2024,28(03):142-149.DOI:10.19996/j.cnki.ChinBatlnd.2024.03.004.
基金信息:
国家重点研发计划项目(2023YFB2503900); 国家自然科学基金项目(52372203)
2024-05-24
2024-05-24
2024-05-24