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中文摘要：
以柠檬酸为碳源和络合剂。通过溶胶-凝胶法制备LiFePO4/C正极材料，研究了柠檬酸与氢氧化锂的加入比例对LiFePO4／C结构、形貌及电化学性能的影响。结果表明：柠檬酸的加入量明显地影响着LiFePO4／C的微观形貌，当柠檬酸与氢氧化锂的摩尔比例为1．5：1时，LiFePO4／C表面呈现出有利于电子和Li＋传导的疏松的孔状结构，对应地具有最佳的充放电性能。同时，考虑到碳包覆的影响，对以该比例制得的LiFePO4/C为正极材料的扣式电池中乙炔黑的加入量进行了优化。当正极片质量配比为LiFePO4／C：PVDF：乙炔黑=80：15：5时。充放电性能最好。此条件下制得的扣式电池在0．1C和0．2C充放电时，首次放电比容量分别为144．4、123．6mAh／g。循环10次后容量保持率均在95％以上。
英文摘要：
LiFePO4/C composite cathode materials were prepared by sol-gel method with citric acid as carbon source and complexing agent. Structure, morphology and electrochemical properties of the cathode materials with different molar ratios of citric to lithium hydroxide were studied. The results show that, the molar ratios of citric to lithium hydroxide influence the morphology of the cathode materials obviously. Especially, when the molar ratio is 1.5 ： 1, it displays porous structure on the particle surface which is beneficial to transfer electrons and Li-ions, and also gains the highest charge/discharge capacity. Considering the existence of carbon, the amount of acetylene black in process of coin cell is also optimized. When electrode contains 80% of LiFePO4/C, 15% of PVDF, and 5% of acetylene black, the cell gains the highest charge/discharge capacity. The initial discharge specific capacities of the cells reaches 144.4 mAh/g at 0.1 C, and 123.6 mAh/g at 0.2 C in this condition, and the capacity retentions of both conditions are over 95% after 10= cycle.
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