| 球磨方式对锂离子正极材料LiFePO4性能的影响(英文) |
| Effects of Ball-milling on the Preparation of LiFePO4 Cathode Material for Lithium-ion Batteries |
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| 摘要: 采用高温固相合成法制备橄榄石型的LiFePO4正极材料，在合成过程中分别采用湿法球磨和干法球磨两种球磨方式。用X-射线衍射，扫描电镜，激光粒度测试等对合成材料进行表征，并对以LiFePO4为正极的电池进行电化学性能测试。结果表明，相对于干法球磨，湿法球磨制备的LiFePO4样品具有更好的电化学性能，0.2C放电的首次放电比容量为134.9 mAh·g-1，并有优良的大电流放电性能及循环性能。这主要是因为采用湿法球磨制备的LiFePO4材料物相较纯、粒径均匀，与导电添加剂的接触更加紧密，从而提高了LiFePO4材料电化学性能。 |
| 关键词: 磷酸铁锂 球磨 粒径 正极材料 锂离子电池 |
| 基金项目: |
| Abstract: Olivine LiFePO4 / C composite powders were synthesized by solid-state reaction with wet ball-milling procedure. The powder properties and the electrochemical characteristics of the prepared samples were investigated in comparison with those samples obtained by dry ball-milling. The crystal structure and the electrochemical performance were characterized by XRD， SEM， laser particle-size distribution measurement and electrochemical performance testing. The olivine LiFePO4 obtained from wet ball-milling shows a maximum discharge capacity of 134.9 mAh·g-1 at the C/5 rate. The composite also displays a better rate capability， a higher charge-discharge capacity and a more stable cycle-life than those samples from dry ball-milling. The improved electrode performance of samples by wet ball-milling originates mainly from very fine particles of sub-micron size and a homogeneous surface morphology. These powder characteristics increase the surface area of LiFePO4 particles and maximize the contact area with the conductor additives， resulting in enhanced electrochemical performance. |
| Keywords: lithium iron(Ⅱ) phosphate ball-milling particle size cathode material lithium-ion batteries |
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| 摘要点击次数: 2002 |
| 全文下载次数: 2003 |
| 唐致远,高 飞,薛建军.球磨方式对锂离子正极材料LiFePO4性能的影响(英文)[J].无机化学学报,2007,23(8):1415-1420. |
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