Synthesis and performance improvement mechanism of high-efficiency B doped LiNi0.5Co0.2Mn0.3O2 cathode materials for Li-ion batteries

被引：0
|
作者：
Zhu H. [1 ]
Yu H. [1 ]
Jiang Q. [1 ]
Yang Z. [1 ]
Jiang H. [1 ]
Li C. [1 ]
机构：
[1] Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 01期
关键词：
B doping; High voltage; Li-ion batteries; LiNi[!sub]0.5[!/sub]Co[!sub]0.2[!/sub]Mn[!sub]0.3[!/sub]O[!sub]2[!/sub;
D O I：
10.11949/0438-1157.20200836
中图分类号：
学科分类号：
摘要：
High-efficiency doping of strong-bonding energy heteroatoms is an effective strategy to stabilize high-voltage LiNi0.5Co0.2Mn0.3O2 (NCM) ternary cathode materials and improve their electrochemical performance. Herein, a strategy with boron-containing precursor surface enrichment and diffusion-reinforcement by high-temperature calcination is proposed to construct high-efficiency B-doped LiNi0.5Co0.2Mn0.3O2 cathode material (NCM-B). The high B-O bond energy (809 kJ•mol-1) greatly inhibits the evolution of oxygen atoms, hence steadying the oxygen ion framework. Moreover, the LiO2-B2O3 coating layer with high Li+ conductivity can stabilize the electrode-electrolyte interface. Compared with pure NCM, the NCM-B exhibits a high reversible capacity of 193.7 mA•h•g-1 within 3.0-4.5 V and delivers a superior high-rate performance of 120 mA•h•g-1 at 10 C (only 78.2 mA•h•g-1 for NCM). Furthermore, the capacity retention after 100 cycles at 1 C can be improved from 73% to 90%. The present surface-enrichment and diffusion-reinforcement strategy is expected to realize high-efficiency doping of other cathode materials. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：609 / 618
页数：9
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