Controlled synthesis of spherical hierarchical LiNi_{1 − x − y}Co_xAl_yO₂ (0<x, y<0.2) via a novel cation exchange process as cathode materials for High-Performance Lithium Batteries

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• 作者：Weihua Chen^a ; ^{chenweih@zzu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{shary_hua@163.com" class="auth_mail" title="E-mail the corresponding author} ; Yanyang Li^a ; Dan Yang^a ; Xiangming Feng^a ; Xinxin Guan^a ; Liwei Mi^b ; ^{mlwzzu@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Li-ion battery ; ion exchange ; hierarchical ; spherical
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：190
• 期：Complete
• 页码：932-938
• 全文大小：1957 K

文摘

A series of spherical hierarchical LiNi_{1 − x − y}Co_xAl_yO₂ (0 < x, y < 0.2) were successfully synthesized via a novel and simple cation exchange process. Specifically, spherical flowerlike Ni_{1 − x − y}Co_xAl_y(OH)_2 + y (0 < x, y < 0.2) were obtained from (Ni_0.85Co_0.15)₃(NO₃)₂(OH)₄ via the cation exchange between Al ion and Ni/Co ions while maintaining its morphology. Then, after calcination, the hierarchical spherical LiNi_{1 − x − y}Co_xAl_yO₂ (0 < x, y < 0.2) could be easily obtained. Among these materials, the hierarchical spherical LiNi_0.84Co_0.14Al_0.02O₂ performs the discharge capacity of 190 mAh g⁻¹ at 20 mA g⁻¹ at the second cycle, while the material LiNi_0.85Co_0.15O₂ obtained using the (Ni_0.85Co_0.15)₃(NO₃)₂(OH)₄ without ion exchange performs a discharge capacity of 165 mAh g⁻¹. Furthermore, the hierarchical spherical LiNi_0.84Co_0.14Al_0.02O₂ maintains the high capacity retention of 84.0% after 225 cycles at 200 mA g⁻¹. This work exploits a new and facile way to synthesize high capacity Al-contained layered metal oxides cathode materials.