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PVA-regulated construction of 3D rGO-hosted Na_(3)V_(2)(PO_(4))_(2)F_(3) for fast and stable sodium storage

Journal of Energy Chemistry 2024年第12期99卷 100-109页

作者： Shilong Xu Ying Zhu Xinyan Li Yamei Wang Dong Yan Xiaobin Niu Jingxia Jiang Rui Wu Jun Song Chen School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Medical and Pharmaceutical College Chongqing 401331China Institute for Advanced Study Chengdu UniversityChengdu 610054SichuanChina Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518000GuangdongChin

Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF) is shown to be an attractive cathode material for sodium storage due to its high theoretical capacity and suitable working ***,its low electronic conductivity and poor cycling stability have to be addressed in order for enhanced high-rate performance and cycle ***,we have prepared a 3D reduced graphene oxide (rGO) host-supported NVPF *** discover that polyvinyl alcohol (PVA) serves as an important structural directing agent that bridges between NVPF and rGO through the hydrogen bonding,and thus regulates the formation of the 3D r GO framework with NVPF nanocuboids embedded inside (NVPF@C@rGO).With such a unique construction,NVPF@C@rGO exhibits excellent cycling stability and rate performance for sodium storage,showing high reversible capacities of 121 m Ah/g and 113 mAh/g at 1C and 10C,respectively,and 103 mAh/g after 700cycles at 50C with 98.3%*** at an extremely high current of 100C,it also delivers a reversible capacity of 64 mAh/g,surpassing the performance of many recently reported NVPF-based *** voltammetry (CV) and galvanostatic intermittent titration technique (GITT) data confirm the much better kinetic properties of NVPF@C@rGO electrode than the control samples of NVPF@rGO and pure ***-situ XRD results reveal that the 3D rGO housing can effectively suppress the lattice variation of NVPF,with a maximum volume change of only 1.84%during ***,the in-situ temperature sensing reveals the more stable working temperature of NVPF@C@rGO compared to phase-pure NVPF,suggesting a higher temperature safety of the *** NVPF@C@rGO as the positive electrode and commercial hard carbon as the negative electrode,a sodium-ion full battery has been assembled with about 110 m Ah/g at 1C for 300 cycles,corresponding to an energy density of 291 Wh kg^(-1).The construction of 3D r GO housing as a conductive support offers an effective strategy for high-rate,long cyc

关键词： Sodium-ion battery polyanionic compound Reduced graphene oxide 3D carbon layers Na_(3)V_(2)(PO_(4))_(2)F_(3)

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