Li(1.2)Mn(0.54)Ni(0.13)Co(0.13)O(2) nanosheets with porous structure as a high-performance cathode material for lithium-ion batteries.
Li(1.2)Mn(0.54)Ni(0.13)Co(0.13)O(2) nanosheets with porous structure as a high-performance cathode material for lithium-ion batteries.
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多孔结构Li1.2Mn0.54Ni0.13Co0.13O2纳米片作为高性能锂离子电池正极材料
DOI：
10.1039/d1ra06420g
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发表时间：
2021-11-10
期刊：
影响因子：
3.9
通讯作者：
Yuan, Huiling
中科院分区：
文献类型：
--
作者：
Gao, Zhi;Sun, Wenliang;Pan, Xiaoliang;Xie, Shikun;Liu, Lijun;Xie, Chengning;Yuan, Huiling
电极材料的形貌和结构优化是提高其电化学性能的有效途径。在此，我们报告了一种简单的共沉淀和随后的煅烧方法来制造Li1.2Mn0.54Ni0.13Co0.13O2纳米片，其由互连的初级纳米颗粒和贯穿整个厚度的开孔组成。通过比较纳米片和团聚纳米颗粒的形貌和结构对电化学性能的影响。具体地，纳米片在0.5C下表现出210 mA h g-1的放电容量，在100次循环后具有85%的容量保持率。改进的电化学性能可以归因于它们的形态和结构的改进，这可以促进充/放电过程中充分的电解质接触、短的扩散路径和良好的结构完整性。该研究为制备具有二维形貌和多孔结构的富锂层状氧化物正极材料提供了一条可行的途径，并揭示了其形貌、结构与电化学性能之间的关系。
The morphological and structural optimizations of electrode materials are efficient ways to enhance their electrochemical performance. Herein, we report a facile co-precipitation and subsequent calcination method to fabricate Li1.2Mn0.54Ni0.13Co0.13O2 nanosheets consisting of interconnected primary nanoparticles and open holes through the full thickness. By comparing the nanosheets and the agglomerated nanoparticles, the effects of the morphology and structure on the electrochemical performance are investigated. Specifically, the nanosheets exhibit a discharge capacity of 210 mA h g−1 at 0.5C with a capacity retention of 85% after 100 cycles. The improved electrochemical performance could be attributed to their morphological and structural improvements, which may facilitate sufficient electrolyte contacts, short diffusion paths and good structural integrity during the charge/discharge process. This work provides a feasible approach to fabricate lithium-rich layered oxide cathode materials with 2D morphology and porous structure, and reveals the relationships between their morphology, structure and electrochemical performance.
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