三维连续结构Li_4Ti_5O_(12)/石墨烯纳米复合材料:制备和其锂离子电池超长循环性能(英文)  

Ultra-Long-Term Cyclability of Li_4Ti_5O_(12)/Graphene Nanocomposite Anode Material with Three-Dimensional Continuous Structure for Lithium-Ion Batteries

作　　者：林子夏[1] 王刚[1] 郑明波[1] 赵斌[1] 李念武[1] 濮林[1] 施毅[1] 

机构地区：[1]南京微结构国家实验室,南京大学电子科学与工程学院,南京210093

出　　处：《无机化学学报》2013年第7期1465-1470,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家重点基础研究发展计划(No.2013CB932900;2011CB922100);国家自然科学基金(No.51202106;60990314;61106089);江苏省自然科学基金(No.KB2011011)资助项目

摘　　要：利用具有三维连续纳米孔结构的热剥离石墨烯为骨架制备Li4Ti5O12/石墨烯纳米复合材料。通过乙醇挥发法在热剥离石墨烯的纳米孔道内引入前驱物,进一步高温热处理,在热剥离石墨烯的孔道内原位形成Li4Ti5O12纳米粒子。利用复合材料作为锂离子电池电极材料。电化学反应过程中,热剥离石墨烯的三维连续结构确保了Li4Ti5O12纳米粒子与石墨烯在长循环过程中的有效接触。因此,复合材料表现出优异的循环稳定性。在5C下,5 000次循环后,其容量保持率高达94%。Li4Ti5O12/graphene nanocomposite was synthesized using thermally exfoliated graphene with a three- dimensional continuous nanoporous structure as the matrix. The precursors were introduced into the interior nanopores of thermally exfoliated graphene by the ethanol evaporation method. After heat treatment, Li4Ti5O12 nanoparticles were formed in sire in the nanopores of thermally exfoliated graphene. As an anode material for lithium-ion batteries, the three-dimensional continuous structure of thermally exfoliated graphene ensures sufficient contact between Li4Ti5O12 and graphene during the long cycling. Consequently, the nanocomposite shows superior cyclic stability. The capacity retentiou is still as high as 94% after 5 000 cycles at 5C.

关 键 词：LI4TI5O12 石墨烯 纳米复合材料 负极材料 锂离子电池 

分 类 号：O614.111[理学—无机化学]