Citation: CAO Yan-Bing, LUO Liang, DU Ke, PENG Zhong-Dong, HU Guo-Rong, JIANG Feng. Synthesis and Electrochemical Properties of LiFe_1-xNb_xPO₄/C Composite Cathode Material by Two-Step Synthesis Route[J]. Acta Physico-Chimica Sinica, ;2013, 29(07): 1507-1514. doi: 10.3866/PKU.WHXB201304231 shu

Synthesis and Electrochemical Properties of LiFe_1-xNb_xPO₄/C Composite Cathode Material by Two-Step Synthesis Route

1.
1 School of Metallurgical Science and Engineering, Central South University, Changsha 410083;
2 School of Materials Science and Engineering, Central South University, Changsha 410083

Received Date: 18 January 2013
Available Online: 23 April 2013
Fund Project: 国家科技支撑计划(2007BAE12B01) (2007BAE12B01) 中央高校基本科研业务费(2012QNZT018) (2012QNZT018) 中国博士后科学基金(2012M521546) (2012M521546)

LiFePO₄/C composite was prepared by two-step synthesis route, with LiH₂PO₄ and FeC₂O₄· 2H₂O as starting materials. In the process, the carbon sources polyvinyl alcohol (PVA) and glucose were added in a stepwise fashion. The well-crystallized LiFePO₄/C composite with homogeneous small particles was obtained after reacting at 700℃ for 4 h. This composite had a discharge specific capacity of 157.3 mAh·g^-1 at 0.1C rate and 138.4 mAh·g^-1 at 1C rate. On the basis of carbon coating modification, Nb-ion-doped LiFe_1-xNb_xPO₄/C (x=0.005, 0.01, 0.015, 0.02) composites were prepared. The optimized LiFe_0.99Nb_0.01PO₄/C cathode displayed a discharge specific capacity 160.5 mAh·g^-1 at 0.1C discharge rate, 136.0 mAh·g^-1 at 5C and maintained 134.8 mAh·g^-1 after 50 cycles, showing od rate properties and cycling stability. Cyclic voltammetry (CV) measurements indicated that aliovalent dopant substituting on the Fe sites can reduce the resistance of Li ion diffusion in the electrode process, increase phase transformation kinetics during cycling, and enhance the reversibility of LiFePO₄ electrodes.
- Polyanion cathode material,
- LiFePO₄,
- Two-step synthesis,
- Nb doping
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis and Electrochemical Properties of LiFe1-xNbxPO4/C Composite Cathode Material by Two-Step Synthesis Route

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通讯作者: 陈斌, bchen63@163.com

Synthesis and Electrochemical Properties of LiFe_1-xNb_xPO₄/C Composite Cathode Material by Two-Step Synthesis Route