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Synthesis and Electrochemical Performances of Carbon Coated LiFe0.5Co0.5PO4 Solid Solution as Cathode Materials
Author NameAffiliationE-mail
ZHONG Yan-Jun School of Chemical Engineering, Sichuan University, Chengdu 610065, China  
WU Zhen-Guo School of Chemical Engineering, Sichuan University, Chengdu 610065, China  
TIAN Hai School of Chemical Engineering, Sichuan University, Chengdu 610065, China  
GUO Xiao-Dong School of Chemical Engineering, Sichuan University, Chengdu 610065, China  
ZHONG Ben-He School of Chemical Engineering, Sichuan University, Chengdu 610065, China  
WANG Xin-Long School of Chemical Engineering, Sichuan University, Chengdu 610065, China wangxl@scu.edu.cn 
Abstract: Cabon coated LiFe0.5Co0.5PO4 solid solution (LiFe0.5Co0.5PO4/C, LFCP/C) were synthesized via a facile rheological phase method using iron phosphate tetrahydrate (FePO4·4H2O) and iron oxalate dihydrate (FeC2O4·2H2O) as iron source, respectively. The phase composition, particle morphology and electrochemical performance for the as-prepared materials were characterized by methods including X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and galvanostatic charge-discharge measurements. Results demonstrate that both LFCP/C samples possess olivine structure with high crystallinity, while there are significant difference in particle size distribution, carbon coating effect and electrochemical properties. As cathode for lithium ion batteries (LIBs), the LFCP/C obtained by FeC2O4·2H2O as reactant exhibits better electrochemical performance than that by FePO4·4H2O, delivering a specific discharge capacity of 137.5 mAh·g-1 at 0.1C (1C=150 mA·g-1) rate in the voltage range of 2.5~5.0 V, and even at 10C rate, a specific capacity of 57.6 mAh·g-1 is still maintained. Meanwhile, it shows excellent cyclability with a capacity retention rate of 78.1% after 100 cycles at 0.5C. The better electrochemical performance of LFCP/C obtained by FeC2O4·2H2O can be mainly ascribed to its smaller average particle size, higher BET specific surface area, and more appealing carbon coating effect.
Keywords: lithium ion battery  LiFe0.5Co0.5PO4/C  rheological phase method  iron source  electrochemical performance
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ZHONG Yan-Jun,WU Zhen-Guo,TIAN Hai,GUO Xiao-Dong,ZHONG Ben-He,WANG Xin-Long.Synthesis and Electrochemical Performances of Carbon Coated LiFe0.5Co0.5PO4 Solid Solution as Cathode Materials[J].Chinese Journal of Inorganic Chemistry,2018,34(8):1581-1589.
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Chinese Journal of Inorganic Chemistry