Advanced Mesoporous Spinel Li4Ti5O12/rGO Composites with Increased Surface Lithium Storage Capability for High-Power Lithium-Ion Batteries
Advanced Mesoporous Spinel Li4Ti5O12/rGO Composites with Increased Surface Lithium Storage Capability for High-Power Lithium-Ion Batteries
复制标题
先进介孔尖晶石 Li4Ti5O12/rGO 复合材料，提高高功率锂离子电池的表面储锂能力
DOI：
10.1021/acsami.6b01644
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发表时间：
2016-04-13
影响因子：
9.5
通讯作者：
Wu, Gang
中科院分区：
文献类型：
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作者：
Ge, Hao;Hao, Tingting;Wu, Gang
尖晶石 Li4Ti5O12 (LTO) 和还原氧化石墨烯 (rGO) 因其独特的电化学性能而成为锂离子电池 (LIB) 极具吸引力的负极材料。在此，我们报告了一种简便的一步水热法制备纳米复合阳极，该纳米复合阳极由分散良好的介孔 LTO 颗粒组成，位于 rGO 上。一个重要的反应步骤涉及葡萄糖作为合成过程中的新型连接剂和还原剂。人们发现它可以防止 LTO 颗粒聚集，并在纳米复合材料中产生介孔结构。此外，GO在水热过程中被葡萄糖上的羟基还原成rGO。与之前报道的LTO/石墨烯电极相比，新制备的LTO/rGO纳米复合材料具有介孔特性，并提供额外的表面储锂能力，优于传统的LTO基锂离子电池材料。这些独特的性能显着提高了电化学性能。特别是，该纳米复合材料负极在0.5 C下具有193 mAh g(-1)的超高可逆容量，并且在30 C、1.0至2.5 V之间保持168 mAh g(-1)的优异倍率性能。因此，新制备的具有增强表面储锂能力的介孔LTO/rGO纳米复合材料将为开发高功率锂离子电池负极材料提供新的机遇。
Spinel Li4Ti5O12 (LTO) and reduced graphene oxide (rGO) are attractive anode materials for lithium-ion batteries (LIBs) because of their unique electrochemical properties. Herein, we report a facile one-step hydrothermal method in preparation of a nanocomposite anode consisting of well-dispersed mesoporous LTO particles onto rGO. An important reaction step involves glucose as a novel linker agent and reducing agent during the synthesis. It was found to prevent the aggregation of LTO particles, and to yield mesoporous structures in nanocomposites. Moreover, GO is reduced to rGO by the hydroxyl groups on glucose during the hydrothermal process. When compared to previously reported LTO/graphene electrodes, the newly prepared LTO/rGO nanocomposite has mesoporous characteristics and provides additional surface lithium storage capability, superior to traditional LTO-based materials for LIBs. These unique properties lead to markedly improved electrochemical performance. In particular, the nanocomposite anode delivers an ultrahigh reversible capacity of 193 mA h g(-1) at 0.5 C and superior rate performance capable of retaining a capacity of 168 mA h g(-1) at 30 C between 1.0 and 2.5 V. Therefore, the newly prepared mesoporous LTO/rGO nanocomposite with increased surface lithium storage capability will provide a new opportunity to develop high-power anode materials for LIBs.