Pilot-scale continuous synthesis of a vanadium-doped LiFePO4/C nanocomposite high-rate cathodes for lithium-ion batteries

JOURNAL OF POWER SOURCES

卷:302

Article

Johnson, Ian D.¹  Luebke, Mechthild¹  Wu, On Ying¹  Makwana, Neel M.¹  Smales, Glen J.^1,2  Islam, Husn U.¹  Dedigama, Rashmi Y.¹  Gruar, Robert I.¹  Tighe, Christopher J.¹  Scanlon, David O.^1,2  Cora, Furio¹  Brett, Dan J. L.³  Shearing, Paul R.³  Darr, Jawwad A.¹ 

[1] UCL, Dept Chem, London WC1H 0AJ, England

[2] Diamond Light Source Ltd, Didcot OX11 ODE, Oxon, England

[3] UCL, Dept Chem Engn, London WC1H 0AJ, England

关键词: Lithium-ion battery;    Phosphate;    Doped;    Continuous hydrothermal synthesis;    High power;    Cathode;   

DOI  :  10.1016/j.jpowsour.2015.10.068

来源: Elsevier

【 摘 要 】

A high performance vanadium-doped LiFePO4 (LFP) electrode is synthesized using a continuous hydrothermal method at a production rate of 6 kg per day. The supercritical water reagent rapidly generates core/shell nanoparticles with a thin, continuous carbon coating on the surface of LFP, which aids electron transport dynamics across the particle surface. Vanadium dopant concentration has a profound effect on the performance of LFP, where the composition LiFe0.95V0.05PO4, achieves a specific discharge capacity which is among the highest in the comparable literature (119 mA h g(-1) at a discharge rate of 1500 mA g(-1)). Additionally, a combination of X-ray absorption spectroscopy analysis and hybrid-exchange density functional theory, suggest that vanadium ions replace both phosphorous and iron in the structure, thereby facilitating Li+ diffusion due to Li+ vacancy generation and changes in the crystal structure. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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