Effective enhancement of electrochemical properties for LiFePO4/C cathode materials by Na and Ti co-doping

被引：106

作者：

Shu, Hongbo ^{[1
]}

Wang, Xianyou ^{[1
]}

Wen, Weicheng ^{[1
]}

Liang, Qianqian ^{[1
]}

Yang, Xiukang ^{[1
]}

Wei, Qiliang ^{[1
]}

Hu, Benan ^{[1
]}

Liu, Li ^{[1
]}

Liu, Xue ^{[1
]}

Song, Yunfeng ^{[1
]}

Zho, Meng ^{[1
]}

Bai, Yansong ^{[1
]}

Jiang, Lanlan ^{[1
]}

Chen, Manfang ^{[1
]}

Yang, Shunyi ^{[1
]}

Tan, Jinli ^{[1
]}

Liao, Yuqing ^{[1
]}

Jiang, Huimin ^{[1
]}

机构：

[1] Xiangtan Univ, Sch Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Hunan, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2013年 / 89卷

基金：

中国国家自然科学基金;

关键词：

Lithium ion batteries; LiFePO4/C cathode materials; Na and Ti co-doping; High-temperature solid-state method; Electrochemical performance; ELECTRONIC CONDUCTIVITY; PHOSPHO-OLIVINES; 1ST PRINCIPLES; ION BATTERIES; PERFORMANCE; GITT; FE; COMPOSITES; INTERCALATION; KINETICS;

D O I：

10.1016/j.electacta.2012.11.081

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Na and Ti co-doping Li1-xNaxFe1-xTixPO4/C (x = 0.00, 0.01, 0.03 and 0.05) composites were synthesized by a simple high-temperature solid-state method. The structure, morphology and electrochemical performance of the samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), charge/discharge tests, electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT). The results showed that the Na and Ti co-doped samples kept the olivine structure of LiFePO4, but Na and Ti co-doping can optimize the crystal microstructure, modify the particle morphology, decrease charge transfer resistance, enhance exchange current density, electrical conductivity and Li ion diffusion velocity, and thus improve the electrochemical performance of the LiFePO4/C. Among all the doped samples, Li0.97Na0.03Fe0.97Ti0.03PO4/C showed the best rate capability and cycling stability. The initial discharge capacity of Li0.97Na0.03Fe0.97Ti0.03PO4/C was 151.0 mAh g(-1) with the capacity retention ratio of 99.3% after 100 cycles at 1C. Especially, it still showed a high discharge capacity of over 97.3 mAh g(-1) even at a high rate of 20C. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：479 / 487

页数：9

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