锂电池方面知识点锂电池方面知识点.doc

高电压正极材料 LiNi0.5Mn1.5O4的制备及电化学性能 引用知识点 1.LiMn2O4作为锂离子电池正极材料因其资源丰富，成本低，无毒性，具有较高电压平台，一直受到广泛关注[1–2] [1] PARK O K, CHO Y, LEE S, et al. Who will drive electric vehicles,olivine or spinel [J]. Energy Environ Sci, 2011, 4: 1621–1633. [2] 伊廷锋, 岳彩波, 朱彦荣, 等. 动力锂离子电池正极材料的研究评述[J]. 稀有金属材料与工程, 2009, 38: 1687–1692.YI Tingfeng, YUE Caibo, ZHU Yanrong, et al. Rare Metal MaterEng(in Chinese), 2009, 38: 1687–1692. 2. 但是，由于存在 Jahn-Teller 效应以及 Mn3+的溶解，导致 LiMn2O4在循环过程中容量衰减严重，这也成为了制约其发展的重要因素[3–4] [3] RODRI′GUEZ-CARVAJAL J, ROUSSE G, MASQUELIER C, et al.Electronic crystallization in a lithium battery material: columnar or dering of electrons and holes in the spinel LiMn2O4[J]. Phys Rev Lett,98, 81: 4660–4663. [4] HUANG H T, VINCENT C A, BRUCE P G. Capacity loss of lithium manganese oxide spinel in LiPF6/ethylene carbonate-dimethyl carbon-ate electrolytes [J]. J Electrochem Soc, 1999, 146: 481–485. 3. 研究发现，通过在 LiMn2O4中掺杂少量金属离子形成 LiMxMn1.5–xO4型化合物，可以减少材料中 Mn3+的含量，从而改善其循环性能。在这些材料中，LiNi0.5Mn1.5O4具有较高的理论容量(146.7mA?h/g)、高电压平台(4.7 V)以及优异的循环性能[5–8] [5] AMINE K, TUKAMOTO H, YASUDA H, et al. Preparation and elec-trochemical investigation of LiMn2–xMexO4(Me: Ni, Fe, and x = 0.51.0) cathode materials for secondary lithium batteries [J]. J PowerSources, 1997, 68: 604–608. [6] CABALLERO A, CRUZ M, HERNA′N L, et al. Oxygen deficiency asthe origin of the disparate behavior of LiM0.5Mn1.5O4(M = Ni, Cu)nanospinels in lithium cells [J]. J Electrochem Soc, 2005, 152: A552–A559. [7] 刘国强, 其鲁. 高电压锂离子正极材料的制备和性能[J]. 电池,2005, 35: 261–262.LIU Guoqiang, QI Lu. Battery Bimonthly (in Chinese), 2005, 35:261–262. [8] BHASKAR A, BRAMNIK N N, SENYSHY A, et al. Synthesis, char-acterization, and comparison of electrochemical properties ofLiM0.5Mn1.5O4(M = Fe, Co, Ni) at different temperatures [J]. J Elec-trochem Soc, 2010, 157: A689–A695. 4. 目前，制备 LiNi0.5Mn1.5O4材料的方法主要有固相法[9]、溶胶–凝胶法[10]、浸渍法[11] 、熔盐法[12]、共沉淀法[13]等。 [9] HAGH N M, AMATUCCI G G. A new solid-state process for synthesisof LiMn1.Ni0.5O4?ξspinel [J]. J Power Sources