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[1]孙昊,刘涛,杜晓辉,等.葡萄糖作碳源时碳包覆量对LiFePO4及其锂电池性能的影响[J].石化技术与应用,2024,6:431-435.
　SUN Hao,LIU Tao,DU Xiao-hui,et al.Effect of carbon-coated amount on performances of FePO4 and its lithium battery under glucose as carbon source[J].Petrochemical technology & application,2024,6:431-435.
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葡萄糖作碳源时碳包覆量对LiFePO4及其锂电池性能的影响(PDF)

《石化技术与应用》[ISSN:1009-0046/CN:62-1138/TQ]

期数:
2024年6期
页码:
431-435
栏目:
出版日期:
2024-11-10

文章信息/Info

Title:
Effect of carbon-coated amount on performances of FePO4 and its lithium battery under glucose as carbon source
文章编号:
1009-0045（2024）06-0431-05
作者:
孙昊; 刘涛; 杜晓辉; 任世宏; 孙书红; 方华; 赵鸣芝; 张丽桦
中国石油石油化工研究院 兰州化工研究中心，甘肃 兰州 730060
Author(s):
SUN Hao; LIU Tao; DU Xiao-hui; REN Shi-hong; SUN Shu-hong; FANG Hua; ZHAO Ming-zhi; ZHANG Li-hua
Lanzhou PetroChemical Research Center，Petrochemical Research Institute，PetroChina，Lanzhou 730060，China
关键词:
LiFePO4; 葡萄糖; 碳包覆量; 前驱体; 锂离子电池; 充放电比容量; 充放电倍率; 电化学性能
Keywords:
lithium iron phosphate;  glucose;  carbon-coated amount;  precursor; lithium-ion battery; specific capacity of charge-discharge; C-rate ; electrochemical performance
分类号:
TQ 150.7
DOI:
10.19909/j.cnki.ISSN1009-0045.2024.06.0431
文献标识码:
B
摘要:
首先，以Li2CO3，NH4H2PO4，Fe（NO3）3·9H2O，葡萄糖、无水乙醇为原料，采用溶胶凝胶法合成FePO4前驱体，再采用碳热还原法制备了碳包覆的LiFePO4 （简称为LFP/C）；然后，考察了葡萄糖作为碳源时碳包覆量对LFP/C相纯度、粒径、形貌等的影响，并评价了LFP/C作为正极的锂离子电池的电化学性能。结果表明：当碳包覆量过少或过多时，均不利于LFP/C的高温成型过程，在Fe∶Li∶C（摩尔比）为1.00∶1.02∶0.15时，制得的LFP/C-2纯度更高、分散性更好、颗粒更均匀；以LFP/C-2作为正极制作的锂离子电池，在0.2 C充放电倍率下的初始充放电比容量分别为152.20，132.73 mAh/g，首次充放电效率达91.20%，并且在10.0 C充放电倍率下的充放电比容量能保持在94.70 mAh/g。
Abstract:
Firstly，FePO4 precursor was synthesized by sol-gel method with Li2CO3， NH4H2PO4，Fe(NO3)3·9 H2O，glucose and anhydrous ethanol as raw materials，and then carbon-coated lithium iron phosphate (hereinafter referred to as LFP/C) was prepared by carbothermal reduction method. Then the effects of the amount of glucose as a carbon source on the phase purity and particle size and morphology of LFP/C were investigated. The electrochemical performance of lithium-ion batteries with LFP/C as positive electrode was evaluated. The results showed that when the carbon-coated amount was too little or too much， it was not favorable for the high-temperature forming process on LFP/C. When the molar ratio of Fe∶ Li∶ C at 1.00∶1.02∶0.15，the LFP/C-2 obtained had higher purity，better dispersibility，and more uniform particles. The lithium-ion battery，which made from LFP/C-2 as the positive electrode，had the initial specific capacity of charge-discharge at 152.20，132.73 mAh/g on the premise of 0.2 C-rate (referred to the ratio of current to nominal capacitance of a battery when it was charged and discharged. )，respectively， and the initial charge- discharge efficiency was up to 91.20%. Meanwhile，the specific capacity of charge-discharge could be maintained at 94.70 mAh/g at 10.0 C-rate.

参考文献/References

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备注/Memo

备注/Memo:
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更新日期/Last Update: 2024-11-10