期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 860, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158482
关键词
Lithium-ion batteries; LiMn2O4@Al2O3 cathode; Conductive additives; Oxidized Ketjen Black; Electrochemical performance
资金
- National Natural Science Foundation of China [51902108, 51762006, 51964013]
- Guangxi Innovation Driven Development Subject [GUIKE AA19182020, GUIKE AA19254004]
- Natural Science Foundation of Guangdong Province [2018A030313944]
- Guangxi Technology Base and Talent Subject [GUIKE AD18126001]
- Special Fund for Guangxi Distinguished Expert
This study prepared Al2O3-modified LMO and constructed a LMO@AO/KBO electrode through self-assembly method, forming a highly conductive network that significantly improved rate performance and long-term cycling stability.
Metal oxide modified LiMn2O4(LMO) is an effective method to improve the cycling performance. However, the metal oxide usually has low electronic conductivity, which lead to poor rate performance. Herein, Al2O3 modified LMO (LMO@AO ) with enough oxygen vacancies have been prepared, and further constructed a highly conductive network of LMO@AO/KBO electrode though a self-assembly method using oxidized Ketjen Black (KBO) as conductive carbon additives. The KBO with a large number of oxygen-containing groups and show a negative charge state, while LiMn2O4@Al2O3 particles have a positive charge state. Therefore, the KBO can uniformly adsorption on the surface of LMO@AO particles, forming a continuously conductive network by self-assembly process. In this constructed architecture, a continuously conductive network can not only enhance the electronic conductivity but also facilitate the Li ions transport. As a result, the LMO@AO/KBO-3 electrode still shows excellent rate capability (a high reversible capacity of 83.3 mAh g(-1) can be achieved at ultrahigh rate of 10 C) and superior long-term cycling stability (with a high capacity retention of 85.2% at 10 C even after 900 cycles). (C) 2020 Elsevier B.V. All rights reserved.
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