Assembly of Na(3)V(2)(PO(4))(2)F(3)@C nanoparticles in reduced graphene oxide enabling superior Na(+) storage for symmetric sodium batteries.

Assembly of Na(3)V(2)(PO(4))(2)F(3)@C nanoparticles in reduced graphene oxide enabling superior Na(+) storage for symmetric sodium batteries.
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在还原氧化石墨烯中组装 Na3V2(PO4)2F3@C 纳米粒子,为对称钠电池提供卓越的钠存储

DOI:
10.1039/c7ra13441j
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发表时间:
2018-01-12
期刊:
影响因子:
3.9
通讯作者:
Du, Fei
Du, Fei
中科院分区:
化学3区
文献类型:
--
作者:
Yao, Ye;Zhang, Lu;Gao, Yu;Chen, Gang;Wang, Chunzhong;Du, Fei

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使用还原氧化石墨烯(rGO)封装Na 3 V2(PO 4)2F3@Carbon纳米颗粒,以克服其固有的低电子电导率并实现上级钠存储性能。该阴极具有良好的倍率性能,放电容量约为1000 mAh。在70 C时为64 mA h g−1,在30 C时具有超过4000次循环的超长期循环能力,容量保持率高达81%。这种优异的性能可以归因于NASICON结构的快速离子导电性和互穿导电碳框架的有利组合;从而为这种材料带来良好的赝电容质量。此外,由于在低电位下良好的钠储存性质,可以使用Na 3V 2(PO 4)2F3@C@rGO作为阴极和阳极两者来组装对称的全电池。全电池在20 C倍率下具有53 mA h g-1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。
Reduced graphene oxide (rGO) was used to encapsulate Na3V2(PO4)2F3@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 ca. 64 mA h g−1 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 Na3V2(PO4)2F3@C@rGO as both cathode and anode. The full cell delivers a high discharge capacity of 53 mA h g−1 at 20C rate, further demonstrating the feasibility of this hybrid material for smart grids.
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