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Acta Phys. -Chim. Sin.
Optimizing the Hydrothermal Synthesis of Micro-Sized Olivine LiFePO4
SUN Xiao-Fei1,2, XU You-Long1,2, LIU Yang-Hao3, LI Lu1,2
1 Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, P. R. China;
2 International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, P. R. China;
3 Department of Chemistry, Xi’an Jiaotong University, Xi’an 710061, P. R. China
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The low tap density of LiFePO4 is hindering the energy and power density of lithium-ion batteries in portable electronics, electric vehicles, and stationary electricity storage applications. As part of our work to investigate the pathological mechanism of performance degradation in large particle LiFePO4, micro-sized pristine LiFePO4 without modifications, such as surface coating or bulk doping, was first prepared hydrothermally by optimizing the synthesis parameters in this work. The influences of precursor concentration, solution pH, hydrothermal temperature, and heating time on the phase structure, particle size, and morphology of the products were systematically investigated. It was found that the particle size of LiFePO4 increases with decreasing pH value, increasing precursor concentration, increasing hydrothermal temperature, and increasing heating time during hydrothermal synthesis. The performance degradation of large particle LiFePO4 was demonstrated by these intrinsic samples. The specific discharge capacity decreased from 152 to 80 mAh·g-1 at 0.1C rate when the particle size was increased from 0.7 to 16.5 μm. Moreover, less capacities were retained after 100 cycles at 1C rate for larger particle materials. Finally, the optimized LiFePO4 with a distorted diamond shape was prepared for later investigation of the plausible mechanism of performance degradation in large particle LiFePO4. Its electrochemical performance was preliminarily discussed, and will need to be improved in future to obtain practical high energy/power density LiFePO4 cathodes for lithium-ion batteries.

Key wordsLithium iron phosphate      Hydrothermal synthesis      Micro-sized particles      Performance degradation      Cathode material      Lithium-ion battery     
Received: 03 July 2012      Published: 27 September 2012
MSC2000:  O646  
Cite this article:

SUN Xiao-Fei, XU You-Long, LIU Yang-Hao, LI Lu. Optimizing the Hydrothermal Synthesis of Micro-Sized Olivine LiFePO4. Acta Phys. -Chim. Sin., 2012, 28(12): 2885-2892.

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