Yao Ye, Zhang Lu, Gao Yu, Chen Gang, Wang Chunzhong, Du Fei
Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) State Key Laboratory of Superhard Materials, College of Physics, Jilin University China
RSC Adv. 2018 Jan 15;8(6):2958-2962. doi: 10.1039/c7ra13441j. eCollection 2018 Jan 12.
Reduced graphene oxide (rGO) was used to encapsulate NaV(PO)F@Carbon nanoparticles to overcome its inherent low electronic conductivity and achieve superior sodium storage performance. This as-prepared cathode delivers a remarkable rate performance with a discharge capacity of 64 mA h g at 70C and an ultra-long-term cyclability over 4000 cycles with great capacity retention of 81% at 30C. This excellent performance can be attributed to the favorable combination of fast ionic conductivity of the NASICON structure and the interpenetrating conductive carbon framework; thus bringing a good pseudocapacitive quality to this material. Furthermore, thanks to the good sodium storage properties at low potential, a symmetric full cell can be assembled using NaV(PO)F@C@rGO as both cathode and anode. The full cell delivers a high discharge capacity of 53 mA h g at 20C rate, further demonstrating the feasibility of this hybrid material for smart grids.
还原氧化石墨烯（rGO）被用于包裹NaV(PO)F@碳纳米颗粒，以克服其固有的低电子导电性，并实现优异的钠存储性能。这种制备好的阴极展现出卓越的倍率性能，在70C时放电容量为64 mA h g，并且具有超过4000次循环的超长期循环稳定性，在30C时容量保持率高达81%。这种优异的性能可归因于NASICON结构的快速离子导电性与互穿导电碳骨架的良好结合；从而赋予该材料良好的赝电容性质。此外，由于在低电位下具有良好的钠存储性能，可使用NaV(PO)F@C@rGO作为阴极和阳极组装对称全电池。该全电池在20C倍率下具有53 mA h g的高放电容量，进一步证明了这种混合材料用于智能电网的可行性。
