Improved electrochemical performance of a LiFePO4-based composite cathode
Improved electrochemical performance of a LiFePO4-based composite cathode
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DOI：
10.1016/s0013-4686(01)00631-4
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发表时间：
2001-08-10
影响因子：
6.6
通讯作者：
Pasquali, M
中科院分区：
文献类型：
--
作者：
Prosini, PP;Zane, D;Pasquali, M
LiFePO4 是在高表面积炭黑存在下合成的。在晶相形成之前将碳添加到前体中。 SEM 显微照片证实细碳粉的添加减小了 LiFePO4 晶粒尺寸。碳均匀地分散在晶粒之间，确保良好的电子接触。电化学测试表明，添加10wt.%碳获得的材料在提高实际容量和充电/放电速率方面具有增强的性能。发现比容量随着温度的升高而增加。当电池在 80°C 和 C/10 倍率下放电时，获得满容量 (170 mA h g (-1))。在室温和 C/2 倍率下测试材料的循环性能。电池循环超过 230 个周期，平均比容量约为 95 mA h g (-1)。(C) 2001 Elsevier Science Ltd. 保留所有权利。
LiFePO4 was synthesized in the presence of high-surface area carbon-black. The carbon was added to the precursors before the formation of the crystalline phase. SEM micrographs confirmed that the addition of the fine carbon powder reduces the LiFePO4 grain size. The carbon is uniformly dispersed between the grains, ensuring a good electronic contact. Electrochemical tests showed that the material obtained by adding 10 wt.% of carbon gives enhanced performance in terms of improved practical capacity and charge/discharge rate. The specific capacity was seen to increase on increasing temperatures. The full capacity (170 mA h g (-1) was delivered when discharging the cell at 80 degreesC and C/10 rate. The cyclability of the material was tested at room temperature and C/2 rate. The cell was cycled for over 230 cycles with an average specific capacity of about 95 mA h g (-1). (C) 2001 Elsevier Science Ltd. All rights reserved.