期刊
ADVANCED MATERIALS
卷 30, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705575
关键词
cathode materials; energy quality; high capacity batteries; voltage decay
类别
资金
- National Key R&D Program of China [2016YFA0202500]
- National Natural Science Foundation of China [51225204, U1301244, 21127901]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010000]
- DOE Office of Science [DE-SC0012704]
- U.S. Department of Energy, Office of Vehicle Technologies [DE-SC0012704]
Electrochemical energy storage devices with a high energy density are an important technology in modern society, especially for electric vehicles. The most effective approach to improve the energy density of batteries is to search for high-capacity electrode materials. According to the concept of energy quality, a high-voltage battery delivers a highly useful energy, thus providing a new insight to improve energy density. Based on this concept, a novel and successful strategy to increase the energy density and energy quality by increasing the discharge voltage of cathode materials and preserving high capacity is proposed. The proposal is realized in high-capacity Li-rich cathode materials. The average discharge voltage is increased from 3.5 to 3.8 V by increasing the nickel content and applying a simple after-treatment, and the specific energy is improved from 912 to 1033 Wh kg(-1). The current work provides an insightful universal principle for developing, designing, and screening electrode materials for high energy density and energy quality.
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