Highly efficient, fast and reversible multi-electron reaction of Na3MnTi(PO4)3 cathode for sodium-ion batteries

被引：174
作者：
Li, Huangxu [1 ,3 ]
Xu, Ming [4 ]
Gao, Chunhui [1 ]
Zhang, Wei [1 ]
Zhang, Zhian [1 ]
Lai, Yanqing [1 ]
Jiao, Lifang [2 ]
机构：
[1] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China
[2] Nankai Univ, Coll Chem, Minist Educ, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
[3] City Univ Hong Kong, Dept Chem, Kowloon, Hong Kong, Peoples R China
[4] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
来源：
ENERGY STORAGE MATERIALS | 2020年 / 26卷
基金：
中国国家自然科学基金;
关键词：
NASICON; Graphene; Na3MnTi(PO4)(3); Cathode; Sodium-ion batteries; LOW-COST; STORAGE; NATI2(PO4)(3); NA3V2(PO4)(3); PERFORMANCE; STABILITY; FE;
D O I：
10.1016/j.ensm.2019.11.004
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The sodium super ionic conductor (NASICON) structured Na3MnTi(PO4)(3) is attractive due to the eco-friendly and low-cost Na-Mn-Ti-P-O system. However, Na3MnTi(PO4)(3) suffers from low Coulombic efficiency, inferior electronic conductivity and limited specific capacity basing on two-sodium-exchange. To address these multifaceted issues, herein, an interpenetrating graphene encapsulated Na3MnTi(PO4)(3) particles with carbon-shell covering material (rGO@NMTP-C) was synthesized. By regulating cut-off voltages, a three-electron reaction was realized and Coulombic efficiency of the rGO@NMTP-C was found to increase from <96% to 100% due to the fast kinetics that enhanced by Ti3+/Ti4+ redox, which was verified by EIS and GITT. Sodium storage mechanism of the multielectron reaction was deeply studied by ex-situ XRD and DFT calculations. It shows that the enhanced reversibility synergizing with multifunctional 3D conductive network and the contribution of pseudocapacitance, makes rGO@NMTP-C a promising cathode candidate, which can exhibit a remarkable discharge capacity of 173 mA h g(-1). Additionally, for the first time, the rGO@NMTP-C achieves outstanding high rate capability of 92.4 mA h g(-1) at 50C, and cycling stability of 74.5% of capacity retention after 3500 cycles at 20C. High performance full cells were also realized for practical utilization of SIBs.
引用
收藏
页码：325 / 333
页数：9
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