High power Nb-doped LiFePO4 Li-ion battery cathodes; pilot-scale synthesis and electrochemical properties

JOURNAL OF POWER SOURCES

卷:326

Article

Johnson, Ian D.¹  Blagovidova, Ekaterina¹  Dingwall, Paul A.¹  Brett, Dan J. L.²  Shearing, Paul R.²  Darr, Jawwad A.¹ 

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

[2] UCL, Dept Chem Engn, London WC1E 7JE, England

关键词: Cathode material;    Li-ion battery;    Doped;    LiFePO4;    Niobium;    Continuous hydrothermal;   

DOI  :  10.1016/j.jpowsour.2016.06.128

来源: Elsevier

【 摘 要 】

High power, phase-pure Nb-doped LiFePO4 (LFP) nanoparticles are synthesised using a pilot-scale continuous hydrothermal flow synthesis process (production rate of 6 kg per day) in the range 0.01-2.00 at% Nb with respect to total transition metal content. EDS analysis suggests that Nb is homogeneously distributed throughout the structure. The addition of fructose as a reagent in the hydrothermal flow process, followed by a post synthesis heat-treatment, affords a continuous graphitic carbon coating on the particle surfaces. Electrochemical testing reveals that cycling performance improves with increasing dopant concentration, up to a maximum of 1.0 at% Nb, for which point a specific capacity of 110 mAh g(-1) is obtained at 10 C (6 min for the charge or discharge). This is an excellent result for a high power cathode LFP based material, particularly when considering the synthesis was performed on a large pilot-scale apparatus. (C) 2016 The Authors. Published by Elsevier B.V.

【 授权许可】

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