Preparation of dense LiFePO4/C composite positive electrodes using spark-plasma-sintering process
Preparation of dense LiFePO4/C composite positive electrodes using spark-plasma-sintering process
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DOI：
10.1016/j.jpowsour.2005.03.099
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发表时间：
2005-08
影响因子：
9.2
通讯作者：
T. Takeuchi;M. Tabuchi;A. Nakashima;Tatsuya Nakamura;Y. Miwa;H. Kageyama;K. Tatsumi
中科院分区：
文献类型：
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作者：
T. Takeuchi;M. Tabuchi;A. Nakashima;Tatsuya Nakamura;Y. Miwa;H. Kageyama;K. Tatsumi
采用放电等离子烧结（SPS）技术制备了适用于高电流密度循环的锂离子二次电池复合正极材料LiFePO 4/C。碳含量为20 wt.%的LiFePO 4/C复合正极结果表明，在600°C的SPS过程中，LiFePO 4颗粒被细小的碳颗粒包裹，形成了约10μm的团聚体。这导致更高的电极密度。使用LiFePO 4/C复合正极的电池的充电/放电测试显示，与使用常规混合的LiFePO 4 +C复合正极的电池相比，在17- 850 mAhg-1（0.1-5C）的倍率下具有上级的循环性能。电池性能的提高归因于LiFePO 4与碳粉之间的强结合。因此，即使在高电流速率下，电网络在电化学氧化还原循环期间也几乎保持不变。
Composite positive electrodes LiFePO4/C, applicable for rechargeable lithium-ion batteries cycled at high current density, were prepared using spark-plasma-sintering (SPS) technique. LiFePO4/C composite positive electrodes with carbon content of 20wt.% was synthesized at 600°C in the SPS process, and it was found that LiFePO4particles were covered with fine carbon particles and they formed agglomerates with the size of about 10μm. It resulted in higher electrode density. Charge/discharge tests for the cell using LiFePO4/C composite positive electrodes showed superior cycle performance at the rates of 17–850mAhg−1(0.1–5C) compared with the cell using the conventionally blended LiFePO4+C composite positive electrodes. The improvement of the cell performance was attributed to strong binding between LiFePO4and carbon powders. Consequently, the electrical network remained almost unchanged during electrochemical redox cycling, even at high current rates.