摘要
为解决富镍层状正极材料离子电导率低、容量衰减快、循环性能差等多重问题, 通过两步球磨法并精确控制LiFePO4和LiMn2O4的包覆质量比, 合成了不同包覆量的LiNi0.815Co0.15Al0.035O2@LiFePO4@LiMn2O4 (NCA@LFP@LMO, 简称AFM) 系列正极材料。其中, 包覆质量比为8:1:1的NCA、LFP和LMO正极材料 (A8F1M1)呈现出更理想的纳米复合涂层, 并且在 1.0C下循环200次后仍可提供151.67 mAh·g-1的放电比容量 (容量保持率为 94.52%)。此外, dQ/dV曲线和电化学阻抗谱 (EIS) 表明A8F1M1 可以有效抑制由有害的H2↔H3 相变在4.2 V附近引起的内部结构损伤, 降低电荷转移电阻 (Rct) 并提高Li+(D +Li )的扩散系数。鉴于此, 我们的工作有望为先进正极材料的设计、开发和应用提供新的思路。
Graphical Abstract
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This study was financially supported by the Natural Science Foundation of Qinghai (No. 2018-ZJ-727).
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Lan, ZW., Zhang, JR., Li, YY. et al. LiFePO4 and LiMn2O4 nanocomposite coating of LiNi0.815Co0.15Al0.035O2 cathode material for high-performance lithium-ion battery. Rare Met. 41, 2560–2566 (2022). https://doi.org/10.1007/s12598-022-01993-4
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DOI: https://doi.org/10.1007/s12598-022-01993-4