Affiliation:
1. Pen‐Tung Sah Institute of Micro‐Nano Science and Technology College of Materials Xiamen University Xiamen 361005 P. R. China
2. College of Materials Science and Engineering Chongqing University Chongqing 400044 P. R. China
Abstract
AbstractSodium‐ion batteries (SIBs) are promising alternatives for large‐scale energy storage owing to the rich resource and cost effectiveness. However, there are limitations of suitable low‐cost, high‐rate cathode materials for fast charging and high‐power delivery in grid systems. Herein, a biphasic tunnel/layered 0.80Na0.44MnO2/0.20Na0.70MnO2 (80T/20L) cathode delivering exceptional rate performance through subtly regulating the sodium and manganese stoichiometry is reported. It delivers a reversible capacity of 87 mAh g−1 at 4 A g−1 (33 C), much higher than that of tunnel Na0.44MnO2 (72 mAh g−1) and layered Na0.70MnO2 (36 mAh g−1). It proves that the one‐pot synthesized 80T/20L is able to suppress the deactivation of L‐Na0.70MnO2 under air‐exposure, which improves the specific capacity and cycling stability. Based on electrochemical kinetics analysis, the electrochemical storage of 80T/20L is mainly based on pseudocapacitive surface‐controlled process. The thick film of 80T/20L cathode (a single‐side mass loading over 10 mg cm−2) also has superior properties of pseudocapacitive response (over 83.5% at a low sweep rate of 1 mV s−1) and excellent rate performance. In this sense, the 80T/20L cathode with outstanding comprehensive performance could meet the requirements of high‐performance SIBs.
Funder
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
4 articles.
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