期刊
JOURNAL OF POWER SOURCES
卷 327, 期 -, 页码 273-280出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.07.064
关键词
Lithium-ion batteries; Lithium-rich layered oxides; Boron doping; Tetrahedral sites
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010101]
- Science and Technology Service Network Initiative of the Chinese Academy of Science [KFJ-EW-STS-110]
- Ningbo Science and Technology Innovation Team [2012B82001]
- Cooperation of the Chinese Academy of Science
- United states Department of Energy [174433KYSB20150047]
Migration of transition metal (TM) ions to tetrahedral sites plays a crucial role on structural transformation and electrochemical behaviors for Li-rich layered oxides. Here, incorporating small B3+ in the tetrahedral interstice is employed to block the migration channel of TM ions and stabilize the crystal structure. Benefiting from their good structural stability, Li-rich layered materials with B-doped Li1.198Ni0.129Co0.129Mn0.535B0.01O2 and Li1.196Ni0.127Co0.127Mn0.529B0.02O2, exhibit excellent cycling performance and voltage stability. After 51 cycles at 0.2 C, 1 mol.% boron incorporated sample can deliver 211 mAh g(-1) with capacity retention of 89.9%, which is much higher than that of the undoped sample of 177 mAh g(-1), with the retention of 79.2%. Moreover, the declined voltage per cycle decreases from 3.6885 mV to 2.7530 mV after 2 mol.% boron doping. XRD patterns after extended cycling verified the suppression of the structural transformation by the incorporation of boron. (C) 2016 Elsevier B.V. All rights reserved.
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