摘要
在锂离子电池充放电过程中,锂离子在正负极材料中反复嵌入与脱嵌,使LiCoO2活性材料的结构在多次收缩和膨胀后发生改变,同时导致LiCoO2发生层间松动而脱落,使内阻增大,电化学比容量减小。本文主要针对这些问题,提出在LiCoO2表面包覆一层Al2O3。包覆Al2O3后可避免LiCoO2与电解液直接接触,减少电化学比容量损失,从而提高Li-CoO2的电化学比容量,改善其循环性能,延长使用寿命。本文通过扫描电子显微镜、透射电子显微镜、X-射线衍射和电化学性能测试等分析研究,说明了这种表面修饰对改进材料的电化学性能是十分有意义的。
lithium ion battery embed and take off again and again, it makes construction of activated material changed after many constriction and inflate. At the same time, it makes granule of LiCoO2 loosen and then it shed off, make the resistance enlarged, the capacity decreased. Aims at these problems primarily, this text makes suggestions that coating a layer oxide in the LiCoO2 surface, for example： the Al2O3. Coating Al2O3 can avoid the LiCoO2 getting in touch with electrolyte directly, so it can reduce the capacity loss, and increase Li- CoO2 capacity, improve its circulating function, extend its using life. Scanning electron microscope （SEM）, transmission electron microscope （TEM）, X- ray diffraction （XRD） and electrochemical studies indicate that surface modification improves the cycle stability of the material significantly.
出处
《有色矿冶》
2006年第4期37-39,36,共4页
Non-Ferrous Mining and Metallurgy
