期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 41, 页码 22233-22241出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm35550g
关键词
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资金
- NSFC [91022018, 21025104]
- National Basic Research Program of China [2011CB935904]
- FJIRSM [SZD08002-3, SZD09003-1]
The majority of electrode materials suffer from severe capacity fading on cycling at elevated temperatures or poor conductivity and diffusion of Li+ at low temperatures, which have made it very difficult for lithium-ion batteries to operate at low temperatures and/or elevated temperatures without loss of electrochemical performance. In this work, we report on a new strategy for tackling this issue through low-concentration donor-doping of higher valence Mn ions in Li CoO2, a typical commercial cathode for many lithium-ion batteries. Firstly, low-concentration Mn-doped LiCoO2 was successfully synthesized using a molten-salt method, in which solvent NaOH provides an alkaline environment that makes the reactant mixture uniform in reaction process and ensures the valence state of Mn ion at +4. Secondly, the chemical compositions for all samples were systematically tuned, while retaining the single-phase nature. The electrochemically inert Mn4+ was found to significantly enhance the structure stability, conductivity, and diffusion rate of Li CoO2. As a consequence, the cathode material with a composition of LiCo0.95Mn0.05O2 exhibited an excellent electrochemical performance in a temperature range from -10.4 to 45.4 degrees C. The finding reported in this work will be conducive to the applications of lithium-ion batteries under different temperature conditions.
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