Affiliation:
1. Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China
2. University of Chinese Academy of Sciences Beijing 100049 China
3. Tianmu Lake Institute of Advanced Energy Storage Technologies Liyang Jiangsu 213300 China
4. Yangtze River Delta Physics Research Center Liyang Jiangsu 213300 China
5. Nano Science and Technology Institute University of Science and Technology of China Suzhou 215123 China
Abstract
AbstractMetal fluoride–lithium batteries with potentially high‐energy densities are regarded as promising candidates for next‐generation low‐cost rechargeable batteries. However, liquid‐electrolyte metal fluoride–lithium batteries suffer from sluggish reaction kinetics, high voltage hysteresis due to side reactions, poor rate capability, and rapid capacity drop during cycling. Moreover, the research on sulfide all‐solid‐state batteries (ASSBs) with metal fluoride cathode is still lacking. Herein, four kinds of iron fluoride materials are applied to the sulfide all‐solid‐state lithium battery system for the first time to investigate the best cathode and corresponding methods. Electrochemical tests showed the cycling performance at different current densities (0.1, 0.3, and 1 C) and rate performance of the four cathodes with the following rules: FeF3‐HT > FeF3‐RT > FeF3·0.33H2O > FeF3·3H2O. The reversible capacities of FeF3‐HT AASB are 519.9 mAh g−1 after 120 cycles at 0.3C and still maintains 340.7 mAh g−1 after 400 cycles even at a high rate of 1 C. In addition, electro impedence spectroscopy and cyclic voltammetry tests of the above four cathodes show that different contents of crystal water, morphologies, and particle sizes have a great influence on the lithium storage mechanism of cathode. Moreover, the reason for the FeF3‐HT cathode's superior specific capacity and rate performance compared with other cathodes at high current densities is revealed, according to cyclic voltammogram tests under different scan rates. The cause is that FeF3‐HT has the highest proportion of the contribution capacity of the cathode surface control process. The above research opens up a new avenue for FeF3‐HT, FeF3‐RT, FeF3·0.33H2O, and FeF3·3H2O cathodes in sulfide ASSBs.
Funder
National Natural Science Foundation of China
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment
Cited by
22 articles.
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