High‐Capacity Cathode Material with High Voltage for Li‐Ion Batteries |
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| Authors: | Ji‐Lei Shi Dong‐Dong Xiao Mingyuan Ge Xiqian Yu Yong Chu Xiaojing Huang Xu‐Dong Zhang Ya‐Xia Yin Xiao‐Qing Yang Yu‐Guo Guo Lin Gu Li‐Jun Wan |
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| Affiliation: | 1. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, P. R. China;2. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, P. R. China;3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing, P. R. China;4. Brookhaven National Laboratory, Upton, NY, USA |
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| Abstract: | 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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| Keywords: | cathode materials energy quality high capacity batteries voltage decay |
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