Construction of Na3V2(PO4)3/CN/rGO Composite Cathode Material and Its Sodium Storage Performance
WANG Shijie1, XIAO Hui1, REN Yurong1, HUANG Xiaobing2, WANG Haiyan3
1 Jiangsu Province Engineering Research Center of Intelligent Manufacturing Technology for the New Energy Vehicle Power Battery, Changzhou Key Laboratory of Intelligent Manufacturing and Advanced Technology for Power Battery, Changzhou Key Laboratory of the Vital Technology for Power Battery and Management System, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China 2 Hunan Province Cooperative Innovation Center for the Construction & Development of Dongting Lake Ecological Economic Zone, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde 415000, China 3 Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
Abstract: Na3V2(PO4)3 is regarded as a viable and promising cathode material in sodium-ion batteries because of its high capacity and NASICON structure. However, the low conductivity leads to unsatisfactory electrochemical performance under high current charge and discharge conditions. In this work, Na3V2(PO4)3/CN/rGO (NVP/CN/rGO)cathode material on the basis of nitrogen doped carbon and reduced graphene oxide (rGO) decorated are prepared via the solid phase method, and the influence of different contents of rGO on the microscopic morphology and electrochemical performance of the NVP/CN/rGO cathode material, are systematically studied by the aid of material characterization methods and electrochemical analysis techniques. The results reveal that NVP/CN/rGO-2 particles are very uniform, and they display an excellent electrochemical performance, which is confirmed by high discharge specific capacity (116.4 mAh·g-1 at 0.2 C) and long-term lifetime (97.2% capa-city retention after 1 500 cycles). The main reason for the excellent performance of the composites is that the special conductive network structure of grapheme can connect the isolated NVP/CN particles and further improve its conductivity, thereby showing excellent storage sodium perfor-mance.
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2021, Vol. 35 
