锂氧电池关键技术研究

锂氧电池是一种用金属锂作负极,以氧气作为正极反应物的金属空气电池,由于其具备较高的理论比能量且环境友好等优势,近年来开始备受关注。本文主要概述了锂氧电池关键技术的最新研究进展,包括正极材料、催化剂、电解质、负极及电池结构等,并在此基础上对其未来发展趋势进行了展望,以期对其他金属空气电池的研究提供新思路和手段。     

锂离子电池硅-锰复合材料的电化学性能

The Si-Mn composites were synthesized by ball-milling mixtures of four different atomic ratios of Si/Mn. The phases of composites were analyzed with X-ray diffraction. Their charge-discharge performance as negative electrodes in Li-ion batteries were tested and the formation of SEI film was studied by differential capacity plots. The results show that materials prepared by ball-milling technology are composites consisting of Si and Mn. The insertion of lithium ions leads to the formation of amorphous Li-Si alloy. The initial reversible capacity and efficiency of Si-Mn composites are increased and the cycle life is enhanced obviously，especially after their heat treatment. The composite of Si∶Mn=4∶6 exhibits a reversible capacity of 546.0 mAh·g^-1 and a charge-discharge efficiency of 70%. The reversible capacity maintains at 374.2 mAh·g^-1 after 40 cycles.