期刊
JOURNAL OF POWER SOURCES
卷 315, 期 -, 页码 284-293出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.03.024
关键词
Coating layer; Surface modification; Lithium phosphate; Lithium-rich layered oxide; Cathode; Lithium-ion battery
资金
- National Research Foundation of Korea Grant - Korean Government (MEST) [NRF-2012M1A2A2671792]
- Korea Institute of Science and Technology (KIST) institutional program [2E25304]
- Ministry of Science, ICT & Future Planning, Republic of Korea [2E25304] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The facile surface modification of transition-metal hydroxide precursors with ammonium dihydrogen phosphate was performed by ball-milling before the calcination process. The prepared precursors were mixed with the required amount of lithium hydroxide and then simply calcined to obtain lithium phosphate-coated lithium transition metal oxide cathodes during the one-pot calcination process. A thin, homogeneous Li3PO4 coating is firstly formed on the surface of the precursor owing to the abundance of lithium at a lower-temperature range, and subsequent formation of lithium transition metal oxide is achieved at a higher-temperature range during the calcination process. The Li3PO4-coated cathode electrode with the high loading level over 12 mg cm(-1) exhibits a discharge capacity of 106 mAh g(-1) at 5C at ambient temperature. Furthermore, it delivers 90% capacity retention after 50 cycles at 60 degrees C. (C) 2016 Elsevier B.V. All rights reserved.
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