阳极
材料科学
电化学
阴极
锂(药物)
离子电导率
碳纤维
离子键合
化学工程
电极
功率密度
纳米技术
制作
扩散
多孔性
碳纳米管
离子
电解质
复合材料
化学
热力学
物理化学
功率(物理)
内分泌学
工程类
物理
复合数
病理
有机化学
医学
替代医学
作者
Liming Jin,Ruiqi Gong,Junsheng Zheng,Cunman Zhang,Yongyao Xia,Jim P. Zheng
标识
DOI:10.1002/celc.201900169
摘要
Abstract Li 2 TiSiO 5 was recently proposed as a Ti‐based anode material for lithium‐ion batteries (LIBs), with the desirable characteristics of low discharge potential and relatively high specific capacity. However, the intrinsically poor electronic and ionic conductivities give rise to its sluggish electrochemical performance. In this work, Li 2 TiSiO 5 modified with a dual‐carbon network (C@LTSO/CNT) is developed by performing a facile synthesis. The obtained dual‐carbon network coupled with small‐sized LTSO particles delivers enhanced electron conductivity frameworks, abundant active interfaces, and a notably higher inner porosity for multidirectional ion diffusion. Such a unique architecture leads to a high specific capacity as well as an ultrafast electrochemical process for LTSO through remarkable electronic and ionic transfer. C@LTSO/CNT electrodes with a low discharge plateau at 0.28 V achieve an extremely competitive specific capacity of over 430 mAh g −1 at 0.5 C, a superb high‐rate performance over 125 mAh g −1 up to 10 C, and a stable cycle lifespan of 1500 cycles without any degradation, displaying significant potential as an ideal anode candidate. Thus, a high‐performance LIB full cell is fabricated with a C@LTSO/CNT anode and a LiFePO 4 cathode. This cell shows an energy density of 200 Wh kg −1 with greatly improved properties of high‐power density and pronounced cycling stability.
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