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Citation: GAN Hui, TONG Qing-Song, WANG Bing-Bing, XU Wei, LIAN Jin-Ming. Synthesis of LiFePO₄/C from PAA-Li and Its Charge/Discharge Performance and Capacity Loss[J]. Chinese Journal of Applied Chemistry, ;2006, 23(2): 179-183. shu

Synthesis of LiFePO₄/C from PAA-Li and Its Charge/Discharge Performance and Capacity Loss

1.
College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007

Corresponding author: GAN Hui,
Received Date: 22 April 2005
Available Online: 20 September 2005
Fund Project: 福建省教育厅基金资助项目(JA03030) (JA03030)福建省自然科学基金资助项目(E0110021) (E0110021)教育部重点项目(03065) (03065)

Lithium polyacrylate(PAA-Li) prepared in our lab was used as the carbon source and part of the lithium source to synthesize LiFePO₄/C.The sample AA75625 synthesized from 75%(molar fraction) PAA-Li and 25% LiOH·H₂O displayed a discharge capacity of 161 mA·h/g at the 10^th cycle at a current density of 0.04×10^-3 A/cm² and 20℃,showing good cycling performance.It was proved by XRD that the main crystalline phase of all the samples was LiFePO₄.Impurity was found in the samples calcinated at 550℃ or lower,and some peaks attributed to Fe₃O₄ were found for the sample synthesized by 100% LiOH·H₂O at 500℃.The X-ray energy spectrum was used to detect the value of Fe:P(molar ratio) at different randomly chosen areas of the sample AA75625.It was discovered that the molar ratio of Fe to P was inhomogeneous and the average value was 2.2,while the significance interval was(1.3,3.1);therefore,it deviated from(1:1) significantly,which meant that Fe and P distributed inhomogeneously on the surface of the particles.The probable reason causing the inhomogeneous molar ratio of Fe to P was discussed,and it was pointed out that the phenomenon caused the capacity loss.
- lithium ion battery,
- lithium iron(Ⅱ) phosphate,
- PAA,
- capacity loss
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Synthesis of LiFePO4/C from PAA-Li and Its Charge/Discharge Performance and Capacity Loss

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通讯作者: 陈斌, bchen63@163.com

Synthesis of LiFePO₄/C from PAA-Li and Its Charge/Discharge Performance and Capacity Loss