Se掺杂构建无钴高镍正极高电压稳定结构

李清安 ,  张伟 ,  金标 ,  王英舜 ,  贺成

航空材料学报 ›› 2026, Vol. 46 ›› Issue (2) : 81 -88.

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航空材料学报 ›› 2026, Vol. 46 ›› Issue (2) : 81 -88. DOI: 10.11868/j.issn.1005-5053.2024.000125
研究论文

Se掺杂构建无钴高镍正极高电压稳定结构

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Constructing high-voltage stable structures for cobalt-free high nickel cathode via Se doping

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摘要

围绕无钴高镍材料存在的容量衰减快、稳定性能差和结构相变等问题,采用高温固相法合成异质 Se 原子掺杂的无钴高镍层状正极材料 LiNi0.847Mn0.092Al0.061O2。借助多种谱学和电化学性能测试手段,表明 Se 掺杂有效地抑制了结构相变和微裂纹的形成和扩散,其中掺杂量为 1%(原子分数)的 LiNi0.837Mn0.092Al0.061Se0.01O2 正极材料的锂镍混排程度低,具有更好的结晶度和层状结构。在 4.5 V 的高电压下,LiNi0.837Mn0.092Al0.061Se0.01O2 的首圈放电比容量高达 207.61 mAh·g−1,在 1C 倍率下 100 圈循环后的容量保持率由未掺杂的 69.37% 增强至 85.45%。

Abstract

A series of heterogeneous Se-doped cobalt-free high nickel layered cathodes LiNi0.847Mn0.092Al0.061O2 are synthesized using the high-temperature solid-phase method to address the issues of rapid capacity decay,poor stability,and structural phase transition in cobalt-free high nickel materials. The results show that Se doping can effectively inhibit the formation and diffusion of structural phase transition and micro-cracks. Among them,the doping amount of 1% LiNi0.837Mn0.092Al0.061Se0.01O2 low degree of positive electrode material of lithium nickel are mixed,with better crystallinity and lamellar structure. At a high-voltage of 4.5 V,the specific discharge capacity of LiNi0.837Mn0.092Al0.061Se0.01O2 is as high as 207.61 mAh·g−1,and the capacity retention rate increased from 69.37% without doping to 85.45% after 100 cycles at 1C.

关键词

锂离子电池 / 无钴高镍正极 / 掺杂 / 高电压

Key words

lithium-ion batteries / cobalt-free high-nickel cathode / doping / high-voltage

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李清安,张伟,金标,王英舜,贺成. Se掺杂构建无钴高镍正极高电压稳定结构[J]. 航空材料学报, 2026, 46(2): 81-88 DOI:10.11868/j.issn.1005-5053.2024.000125

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基金资助

教育部产学合作协同育人项目(2310056952586489)

东莞市社会发展科技重点项目(20231800935832)

2022 年东莞市科技局东莞市电化学储能器件工程技术研究中心(20221600402072)

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