期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 5, 页码 3308-3318出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b11199
关键词
lithium ion battery; Li-excess layered oxide; surface modification; electrochemical properties; thermal safety
资金
- Ministry of Science and Technology of China [2015CB251103]
- National Natural Science Foundation of China [51472104, 21473075, 51272088, 51572107]
- Defense Industrial Technology Development Program of China [B1420133045]
- Jilin Provincial Science and Technology Department [20140101083JC, 20150204078GX]
The Li(Li0.18Ni0.15Co0.15Mn0.52)O-2 cathode material is modified by a Li4M5O12-like heterostructure and a BiOF surface layer. The interfacial heterostructure triggers the layered-to-Li4M5O12 transformation of the material which is different from the layered-to-LiMn2O4 transformation of the pristine Li(Li0.8Ni0.15Co0.15Mn0.52)O-2. This Li4M5O12-like transformation helps the material to keep high working voltage, long cycle life and excellent rate capability. Mass spectrometry, in situ X-ray diffraction and transmission electron microscope show that the Li4M5O12-like phase prohibits oxygen release from the material bulk at elevated temperatures. In addition, the BiOF coating layer protects the material from harmful side reactions with the electrolyte. These advantages significantly improve the electrochemical performance of Li(Li0.18Ni0.15Co0.15Mn0.52)O-2. The material shows a discharge capacity of 292 mAh g(-1) at 0.2 C with capacity retention of 92% after 100 cycles. Moreover, a high discharge capacity of 78 mAh g(-1) could be obtained at 25 C. The exothermic temperature of the fully charged electrode is elevated from 203 to 261 degrees C with 50% reduction of the total thermal release, highlighting excellent thermal safety of the material.
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