高容量锂合金负极在充放电过程中有大的体积变化，易造成电接触丧失和循环性能下降。已报道的以硅为代表的一些纳米结构的复合材料和电极表明优异的循环性能，但大多难以大规模或低成本制备，或仅仅是在较低电极载量条件下有效，锂合金负极的实际应用仍面临严峻挑战。我们提出本项目的研究，旨在采用易得的硅基和铝基储锂材料，通过预先电化学生成均匀的固体电解质界面相（SEI）膜再使液体电解质原位聚合,形成界面稳定且机械强度高的一体化电池结构，并与直接电解液原位聚合进行比较。优化的SEI与固化的聚合物电解质紧密接触有望改善活性相体积变化时界面的稳定性，并避免液体电解质不断渗入再分解以及锂化的铝与电解液不断反应造成失活，从而从根本上解决高载量合金电极循环效率偏低和稳定性差的问题，并改善电池安全性，推动下一代高能锂离子电池的实用化。

High capacity Li-alloy negative electrodes suffer from big volume changes during charge and discharge, leading to a loss of electronic contact and degradation of the cycling performance. Some reported nanostructured composite materials and electrodes, represented by silicon, demonstrate excellent cycling performances. However, most of them are difficult to be prepared in large-scale or low-cost, or it is valid only under a relatively low electrode loading. The practical application of the Li-alloy negative electrodes still meets the serious challenge. We propose this project, in which easily available Si- and Al-based Li-storage materials are adopted, and an integrative battery structure with the stable interface and high mechanical strength is formed by the electrochemical formation of a homogeneous solid electrolyte interphase (SEI) layer and the following in-situ polymerization of the liquid electrolytes. In addition, this approach will be compared with the direct in-situ polymerization of the liquid electrolyte. Close contact between the optimized SEI and solid polymer electrolyte will improve the interfacial stability under the volume change of the active phase, and avoid the constant permeation and decomposition of the liquid electrolytes and deactivation of the lithiated aluminum caused by its continuous reaction with the electrolyte solution. By this way, the problems of the relatively low cycle efficiency and the poor cycle stability could be fundamentally solved for the high loading alloy electrodes and the battery safety could be improved. This work will push the development of the next generation of Li-ion batteries with high energy density.