喷雾热解法制备钨替代钴的高镍正极材料

侯子涵; 郭利生; 付显龙; 郑鸿贤; 戴雨晴; 王志兴; 段惠; 董明霞; 彭文杰; 颜果春; 王接喜

doi:10.1007/s12613-024-2824-9

Volume 31 Issue 10

Oct. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(10): 2244-2252

Zihan Hou, Lisheng Guo, Xianlong Fu, Hongxian Zheng, Yuqing Dai, Zhixing Wang, Hui Duan, Mingxia Dong, Wenjie Peng, Guochun Yan, and Jiexi Wang, Spray pyrolysis feasibility of tungsten substitution for cobalt in nickel-rich cathode materials, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2244-2252. https://doi.org/10.1007/s12613-024-2824-9

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Zihan Hou, Lisheng Guo, Xianlong Fu, Hongxian Zheng, Yuqing Dai, Zhixing Wang, Hui Duan, Mingxia Dong, Wenjie Peng, Guochun Yan, and Jiexi Wang, Spray pyrolysis feasibility of tungsten substitution for cobalt in nickel-rich cathode materials, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2244-2252. https://doi.org/10.1007/s12613-024-2824-9

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研究论文

喷雾热解法制备钨替代钴的高镍正极材料

1)
中南大学冶金与环境学院先进电池材料教育部工程研究中心, 湖南省高附加值冶金重点实验室, 长沙 410083, 中国
2)
巴斯夫杉杉电池材料有限公司, 长沙 410205, 中国

通讯作者:
彭文杰 E-mail: pwj_csu@163.com

王接喜 E-mail: wangjiexikeen@csu.edu.cn

文章亮点

(1) 系统研究了偏钨酸铵的热解行为。

(2) 合成了具有优异电化学性能的钨替代高镍低钴正极材料。

(3) 研究了钨替代改善材料电化学性能的机理。

中文摘要

钴在高容量高镍正极材料中起着稳定晶格结构的作用。然而，其高昂的成本和毒性仍然限制了其后续发展。通常可以通过过渡金属置换以降低Co含量。然而由于各元素浓度和沉积速率存在差异，传统共沉淀法无法满足多元素共沉淀和元素均匀分布的要求。本文使用喷雾热解法制备LiNi_0.9Co_0.1−xW_xO₂ (LNCW)，并且分析了偏钨酸铵的热解行为与W替代Co的可行性。所得含Ni−Co−W的氧化物前驱体元素分布均匀，有利于W在最终材料中的均匀替代。随着W的替代，材料一次颗粒尺寸从338.06 nm减小到71.76 nm，锂镍混排程度最低低至3.34%。表现出显著改善的电化学性能。优化条件下，LiNi_0.9Co_0.0925W_0.0075O₂在200次循环后的容量保持率高达82.7%。这项工作表明，W可以在一定程度上弥补钴缺乏造成的损失。

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Research Article

Spray pyrolysis feasibility of tungsten substitution for cobalt in nickel-rich cathode materials

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Abstract

Abstract

Cobalt (Co) serves as a stabilizer in the lattice structure of high-capacity nickel (Ni)-rich cathode materials. However, its high cost and toxicity still limit its development. In general, it is possible to perform transition metal substitution to reduce the Co content. However, the traditional coprecipitation method cannot satisfy the requirements of multielement coprecipitation and uniform distribution of elements due to the differences between element concentration and deposition rate. In this work, spray pyrolysis was used to prepare LiNi_0.9Co_0.1−xW_xO₂ (LNCW). In this regard, the pyrolysis behavior of ammonium metatungstate was analyzed, together with the substitution of W for Co. With the possibility of spray pyrolysis, the Ni–Co–W-containing oxide precursor presents a homogeneous distribution of metal elements, which is beneficial for the uniform substitution of W in the final materials. It was observed that with W substitution, the size of primary particles decreased from 338.06 to 71.76 nm, and cation disordering was as low as 3.34%. As a consequence, the prepared LNCW exhibited significantly improved electrochemical performance. Under optimal conditions, the lithium-ion battery assembled with LiNi_0.9Co_0.0925W_0.0075O₂ (LNCW-0.75mol%) had an improved capacity retention of 82.7% after 200 cycles, which provides insight into the development of Ni-rich low-Co materials. This work presents that W can compensate for the loss caused by Co deficiency to a certain extent.
- lithium-ion batteries;
- Ni-rich;
- low-cobalt;
- W substitution;
- spray pyrolysis

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