Self- propagating combustion synthesis nano LiFePO4 cathode material
LI Hang1,CHEN Xiu- juan1,2,ZHANG Peng- lin1
1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, Gansu, China 2. School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
Abstract：Nano- LiFePO4 cathode material has been successfully prepared by self- propagating high- temperature synthesis (SHS) process, and the synthesis reaction mechanism was studied by using combustion wave quenching experiments. The results of XRD and SEM analysis showed that LiFePO4 prepared by SHS was spherically distributed, high crystalline, olivine structure, and particle size distribution between 50- 100nm. LiFePO4 was synthetized under the condition that the adding amount of C6H12N4 was 30% and the ball feed ratio was 0. 5∶1.The first discharge specific capacity of the sample is 109. 3mA·h·g-1 when the current density was 0. 1C, and the capacity retention rate was 88. 7% after 50 cycles. Quenching experiments showed that the synthesis process of LiFePO4 consisted of two stages: the Fe3(PO4)2 of graftonite changes into Fe3(PO4)2 of sarcopside after ball milling, and then LiFePO4 was generated by carbon thermal reduction reaction of sarcopside Fe3(PO4)2 and Li2CO3.
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2018, Vol. 25 
