Enhanced performance of graphite anode materials by AlF3 coating for lithium-ion batteries
Enhanced performance of graphite anode materials by AlF3 coating for lithium-ion batteries
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DOI：
10.1039/c2jm31015e
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Zhang, Ji-Guang
中科院分区：
文献类型：
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作者：
Ding, Fei;Xu, Wu;Zhang, Ji-Guang
利用化学沉淀法首次成功地在工业石墨粉表面制备了一层AlF3薄涂层。在石墨颗粒的体积结构没有明显变化的情况下，观察到一层薄（类似于2nm厚）且均匀的AlF3涂层，含量高达2wt %。与未涂覆石墨阳极相比，涂覆alf3的石墨阳极具有更高的初始放电容量和更高的倍率性能。此外，alf3涂层的石墨阳极比未涂层的石墨阳极具有更好的循环寿命。经过300次循环，阳极由1wt %的alf3涂层石墨和未涂层石墨制成的电池分别显示出92%和81%的容量保留。研究认为，在alf3包覆的石墨颗粒上形成了更加稳定和导电的固体电极间相层，提高了锂离子电池中石墨阳极的性能。
The surface of commercial graphite powders has been successfully modified with a thin AlF3 coating via chemical precipitation for the first time. A thin (similar to 2 nm thick) and uniform AlF3 coating up to 2 wt% content is observed without an evident change in the bulk structure of graphite particles. An AlF3-coated graphite anode delivers a higher initial discharge capacity with much improved rate performance when compared to an uncoated graphite anode. Additionally, the AlF3-coated graphite anode demonstrates a much better cycle life than the uncoated graphite. After 300 cycles, batteries with anodes made from 1 wt% AlF3-coated graphite and uncoated graphite show capacity retentions of 92% and 81%, respectively. It is believed that a more stable and conductive solid electrode interphase layer is formed on AlF3-coated graphite particles, which enhances the performance of graphite anodes in lithium-ion batteries.