期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 12, 页码 4900-4907出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b13438
关键词
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资金
- Beijing Natural Science Foundation [L182050]
- National Natural Science Foundation of China [51672282]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
The development of high energy electrode materials for lithium ion batteries is challenged by their inherent instabilities, which become more aggravated as the energy densities continue to climb, accordingly causing increasing concerns on battery safety and reliability. Here, taking the high voltage cathode of LiNi0.5Mn1.5O4 as an example, we demonstrate a protocol to stabilize this cathode through a systematic phase modulating on its particle surface. We are able to transfer the spinel surface into a 30 nm shell composed of two functional phases including a rock-salt one and a layered one. The former is electrochemically inert for surface stabilization while the latter is designated to provide necessary electrochemical activity. The precise synthesis control enables us to tune the ratio of these two phases, and achieve an optimized balance between improved stability against structural degradation without sacrificing its capacity. This study highlights the critical importance of well-tailored surface phase property for the cathode stabilization of high energy lithium ion batteries.
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