首页|Rapid lithium-ion insertion/extraction and migration behavior of Na2WO4-encapsulated lithium-rich layered oxide cathode
Rapid lithium-ion insertion/extraction and migration behavior of Na2WO4-encapsulated lithium-rich layered oxide cathode
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Due to the low cost,high working voltage and high storage capacity,Li-rich Mn-based layered com-pounds show promise as the cathode materials for lithium-ion batteries(LIBs).However,the side reactions at the solid-liquid interface of the cathode will lead to rapid capacity decay and inferior rate performance.Herein,this article proposes a liquid-phase dispersion strategy to introduce a Na2WO4 layer on the Li1.2Ni0.13-Co0.13Mn0.54O2 cathode,which can reduce the side effects between raw materials and electrolyte and promote the insertion/extraction rate of Li+,thus enhancing the material stability and rate performance.As a result,the capacity retention rate is 96.9％after 200 cycles under 2C.More-over,the capacities are 177.5,149.5,111.1 and 58.3 mAh·g-1 at 1C,2C,5C and 10C,implying a superior fast charging performance.The exceptional performance can be ascribed to both the increased conductivity and enhanced structural stability of the cathode material.What's more,based on the investigation of ion insertion/extraction behavior in electrode materials and the ion migration kinetics in the electrolyte,this study suggests that coating Li-rich Mn-based materials with Na2WO4 can be a promising strategy to improve their performance in LIBs.
School of Materials Science and Engineering,Northeastern University,Shenyang,Shenyang 110819,China
Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China
Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology,College of Chemistry and Chemical Engineering,Liaocheng University,Liaocheng 252059,China
National Natural Science Foundation of ChinaNatural Science Foundation of Hebei ProvinceScience and Technology Research Youth Fund Project of Higher Education Institutions of Hebei ProvinceFundamental Research Funds for the Central UniversitiesNatural Science Foundation of Hebei Province of China
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