材料科学
镍
兴奋剂
锂(药物)
阴极
冶金
纳米技术
光电子学
电气工程
工程类
医学
内分泌学
作者
Zhizhan Li,Xumin Huang,Jianing Liang,Jinlei Qin,Rui Wang,Jinguo Cheng,Deli Wang
标识
DOI:10.1016/j.jechem.2022.11.002
摘要
The high-nickel layered cathodes Li[NixCoyMn1−x−y]O2 (x≥0.8) with high specific capacity and long cycle life are considered as prospective cathodes for lithium-ion batteries. However, the microcrack formation and poor structural stability give rise to inferior rate performance and undesirable cycling life. Herein, we propose a dual modification strategy combining primary particle structure design and element doping to modify Li[Ni0.95Co0.025Mn0.025]O2 cathode by tungsten and fluorine co-doped (W-F-NCM95). The doping of W can convert the microstructure of primary particles to the unique rod-like shape, which is beneficial to enhance the reversibility of phase transition and alleviate the generation of microcracks. F doping is conducive to alleviating the surface side reactions. Thus, due to the synergistic effect of W, F co-doping, the obtained W-F-NCM95 cathodes deliver a high initial capacity of 236.1 mA h g−1 at 0.1 C and superior capacity retention of 88.7% over 100 cycles at 0.5 C. Moreover, the capacity still maintains 73.8% after 500 cycles at 0.5 C and the texture of primary particle is intact. This work provides an available strategy by W and F co-doping to enhance the electrochemistry performance of high-nickel cathodes for practical application.
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