尖晶石型锰酸锂是最有希望替代LiCx，02、LiNi02成为锂离子电池正极的材料。根据掺杂元素的性质从阴离子掺杂、阳离子掺杂和复合掺杂几个方面综述了近年来锂离子电池正极材料尖晶石型LiMn204的掺杂改性的研究成果，并对该材料的未来发展进行了展望。

容量衰减是阻碍尖晶石锂锰氧化物商品化的主要障碍，正极活性材料的溶解、电解液的分解、钝化膜的形成等现象会引起充放电过程中不必要的副反应，这将导致电池容量的损失及衰减。本文总结了以尖晶石Li-Mn-O为阴极材料的电池的各种衰减现象的机理，并对各种机理做了比较和评价。提出了减少容量衰减的几种方法，并对尖晶石Li-Mn-O的发展作出展望。

SEM). The electrochemical properties of composite electrolyte membranes were studied. The ionic conductivityof the polymer electrolyte composed of 75wt. % 1MLiBF4 in ethylene carbonate (EC) and dimethyl carbonate (DMC) (EC:DMC=1:1by weight) was about 2.6×10−3 S cm−1 at ambient temperature. The electrochemical window of the polymer electrolyte was about 4. 6Vdetermined from the linear sweep voltammetry plot. The lithium ion polymer batteries were assembled by sandwiching gel polymer electrolytebetween LiCoO2 cathode and mesophase carbon fibre (MPCF) anode. Charge-discharge test results display that lithium ion batteries withthese gel polymer electrolytes have good electrochemical performance.

安全性是高容量及动力型锂离子电池商品化的主要障碍。当在热冲击、过充、过放、短路等滥用状态下，电池内部的活性物质及电解液等组分间将发生化学、电化学反应，产生大量的热量与气体，当积累到一定程度就会引起电池的着火、爆炸。本文综述了电池内部热量的来源和产生的原因，分析了电池在加热、过充、短路等状态下的爆炸机理，并提出了解决电池爆炸问题的具体措施。

Spinel LiMn2O4 powders were prepared using two•step synthesis method consisting of、solidstate reaction method and citrate modified solgel method. The effects of the calcination temperature and the Li/Mn ratio ofraw materials were studied on the physic0chemical and electrochemical properties of the spinel LiMmO4 powders, such as crystallinity. 1attice constant and density. The title compound was characterized by powder X•ray diffraction(XRD), scanning electron microscopy(SEM)and transmission electron microscopy(TEM). Polycrystalline LiMn204 powers calcined at 750 c(=were found to be composed of very uniformlysized microcrvstal with an aver. age particle size of 300nm. The improvement in electrochemical properties was mainly attributed to the process of re. grinding by absolute alcoho1.