Abstract Spray-freezing/freeze-drying technique was applied to the synthesis of Li2FeSiO4/C composite powders using solutions containing various carbon sources, water-soluble and colloidal carbon, followed by heat treatment. The effects of the carbon sources on the microstructure and battery performance of the synthesized composite powders were investigated. The microstructures of the composite powders were clearly different when different carbon sources were used, ascribed from the thermal behavior of the carbon sources during the heat treatment. It was possible to control the microstructures of Li2FeSiO4/C composite powders by combining different carbon sources, and the synthesized composite powders exhibited high discharge capacities by mixing with only a binder for cathode. The composite powders using glucose and Ketjenblack dispersion as carbon sources delivered 165 mAh/g at first discharge capacity at 0.1 C. The developed chain structure suitable for conducting paths in the electrodes and a higher-specific BET surface area, attributed from Ketjenblack, were likely responsible for the higher performance.

中文翻译：

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不同碳源组合喷雾冷冻/冻干工艺合成的高电池性能Li 2 FeSiO 4 /C复合粉末的微观结构

摘要 将喷雾冷冻/冷冻干燥技术应用于含有多种碳源、水溶性碳和胶体碳的溶液，然后进行热处理合成Li2FeSiO4/C复合粉体。研究了碳源对合成复合粉末微观结构和电池性能的影响。当使用不同的碳源时，复合粉末的微观结构明显不同，这归因于热处理过程中碳源的热行为。可以通过组合不同的碳源来控制 Li2FeSiO4/C 复合粉末的微观结构，并且合成的复合粉末通过仅与阴极粘合剂混合而表现出高放电容量。