首页|一步法实现Rb+/Cl-双位点共掺杂高性能锂离子电池正极材料LiNi0.8Co0.1Mn0.1O2

一步法实现Rb+/Cl-双位点共掺杂高性能锂离子电池正极材料LiNi0.8Co0.1Mn0.1O2

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针对LiNi0.8Co0.1Mn0.1O2(NCM)正极材料在循环过程中结构不稳定的问题,提出了Rb+/Cl-双位点共掺杂NCM材料的策略.NCM晶格中Rb+/Cl-双位点共掺杂的协同效应提高了Li+扩散速率,缓解了内部应变,抑制了高截止电压循环时Li+/Ni2+的混排.电化学测试结果表明,Li0.99Rb0.01(Ni0.8Co0.1Mn0.1)O1.99Cl0.01(RbCl-NCM)材料在电流密度 10C下放电容量高达 176.9 mAh/g;RbCl-NCM材料在电流密度 1C下首次放电容量 203.5 mAh/g,且具有优异的循环性能,经 200 个循环后,容量保持率高达 87.8%,而NCM材料在相同测试条件下的容量保持率仅 57.3%.
Rb+and Cl-Co-doped LiNi0.8Co0.1Mn0.1O2 Cathode Material for High-Performance Lithium Ion Batteries by One-Step Method
To solve the problem of structural instability of cathode material(LiNi0.8Co0.1 Mn0.1O2)(NCM))during cycling,a strategy of co-doping of Rb+and Cl-was proposed for NCM materials.The synergistic effect of co-doping of Rb+and Cl-in the NCM lattice can increase the diffusion rate of Li+and relieve the internal strain,thus hindering the mixing of Li+/Ni2+during high cut-off voltage cycling.Electrochemical test results show that Li0.99Rb0.01(Ni0.8Co0.1Mn0.1)O1.99Cl0.01(RbCl-NCM)has a discharge capacity up to 176.9 mAh/g at a current density of 10C.The initial discharge capacity at 1C is 203.5 mAh/g.After 200 cycles,its capacity retention ratio is as high as 87.8%,showing an excellent cycling performance,while the capacity retention ratio of NCM material is only 57.3%.

lithium-ion batteryternary cathode materialsnickel-rich laminated oxidedouble-site dopingdischarge capacitycurrent densitycycling performancecapacity retention

杨桂芬、杨广场、方明、杨怡诗、赖飞燕

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深圳市计量质量检测研究院,广东 深圳 518055

贺州学院 广西碳酸钙资源综合利用重点实验室,广西 贺州 542899

锂离子电池 三元正极材料 富镍层状氧化物 双位点掺杂 放电容量 电流密度 循环性能 容量保持率

汽车标准化公益性开放课题国家自然科学基金广西自然科学基金广西自然科学基金广西自然科学基金广西自然科学基金

CATARC-Z-2022-01353519640132024GXNSFAA0105152022GXNSFAA035610桂科AD230260382020GXNSFBA297152

2024

矿冶工程
长沙矿冶研究院有限责任公司 中国金属学会

矿冶工程

CSTPCD北大核心
影响因子:1.137
ISSN:0253-6099
年,卷(期):2024.44(2)
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