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Y-Doped Na3V2(PO4)2F3 compounds for sodium ion battery cathodes: electrochemical performance and analysis of kinetic properties
被引:154
作者:

Liu, Wanqiu
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Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China

Yi, Hongming
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Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China
Univ Chinese Acad Sci, Beijing 100039, Peoples R China Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China

Zheng, Qiong
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Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China

Li, Xianfeng
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Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China
Collaborat Innovat Ctr Chem Energy Mat iChEM, Dalian 116023, Peoples R China Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China

Zhang, Huamin
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h-index: 0
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Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China
Collaborat Innovat Ctr Chem Energy Mat iChEM, Dalian 116023, Peoples R China Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China
机构:
[1] Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
[3] Collaborat Innovat Ctr Chem Energy Mat iChEM, Dalian 116023, Peoples R China
基金:
中国国家自然科学基金;
关键词:
LITHIUM-ION;
ELECTRODE MATERIAL;
HIGH-POWER;
CAPABILITY;
CHALLENGES;
COMPOSITE;
GRAPHENE;
CELL;
D O I:
10.1039/c7ta03133e
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:
To improve the intrinsic electronic conductivity and Na ion mobility of Na3V2(PO4)(2)F-3 (NVPF), Y(yttrium) atoms are introduced into the NVPF/C complex as a partial substitute for V(vanadium) through a sol-gel method. The effects of Y substitution on the crystal structure, morphology, electrochemical performance and kinetic properties of NVPF were investigated. Based on the battery performance comparison of the Na3V2-xYx(PO4)(3)/C (x = 0, 0.05, 0.1 and 0.2) samples, Na3V1.9Y0.1(PO4)(3)/C showed the best electrochemical performance and cycling stability. At a low rate of 0.5C, the 5 mol% Y-doped sample delivered a discharge capacity of 121.3 mA h g(-1), which was very close to the theoretical specific capacity. And even at a high rate of 50C, the discharge capacity achieved was higher than 80 mA h g(-1). After 200 cycles, the capacity retention of Na3V1.9Y0.1(PO4)(3)/C could still remain as high as 93.46% at 1C. From the morphology determination and analysis of kinetic properties, it was confirmed that the excellent electrochemical performance of Na3V1.9Y0.1(PO4)(3)/C was mainly due to the enhanced intrinsic electronic conductivity and Na ion mobility caused by introducing a moderate amount of Y to replace the V sites in the NVPF crystal structure. In order to get a better understanding of the relationship between the kinetic properties and the electrochemical performance in a sodium ion battery, a mass and electron transfer process model has been proposed for the first time in the present research.
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页码:10928 / 10935
页数:8
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