材料科学
镍
调制(音乐)
曲面(拓扑)
化学工程
冶金
几何学
数学
美学
工程类
哲学
作者
Shuping Zhang,Ju Wu,Ning Jiang,Han‐Dong Sun,Huanfang Yang,Lian Shen,Mingyue Zhou,Liping Wen,Henghui Zhou,Hailei Zhao
标识
DOI:10.1002/aenm.202401123
摘要
Abstract Nickel‐rich cathode materials have gained popularity in the development of lithium‐ion batteries (LIBs) due to their high energy density, which exceeds 250 Wh kg −1 . However, the instability of bulk and surface structures has significantly limited their industrial application. In this study, a three‐in‐one approach to synergistically modulate the structure of LiNi 0.83 Co 0.06 Mn 0.11 O 2 (NCM83) from surface to bulk by a phytic acid (PA) coating is proposed. This surface treatment leads to the spontaneous formation of an amorphous lithium phosphates coating layer on the outermost surface, a reconstructed NiO layer at the subsurface, and a gradient P doping in the NCM83 bulk. The resulting hierarchical and multifunctional structure provides a facilitated surface Li‐ion conduction, a NiO‐stabilized subsurface with strong resistance toward side reactions between the electrode and electrolyte, a fast Li ion bulk diffusion endowed by the enlarged LiO 6 slab due to the P doping, and an enhanced H2−H3 phase transition reversibility. As a result, the PA‐NCM83 sample exhibits excellent capacity retention with 72.4% after 300 cycles at 1 C within 2.8–4.45 V, and 69.8% after 200 cycles at an elevated temperature of 45 °C. This approach provides a facile and efficient method to stabilize Ni‐rich cathode materials for next‐generation high‐energy LIBs.
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