Improved performance of Li-Se battery based on a novel dual functional CNTs@graphene/CNTs cathode construction
来源期刊：Rare Metals2017年第5期
论文作者：Jing Li Chen Zhang Cheng-Jun Wu Ying Tao Lei Zhang Quan-Hong Yang
文章页码：425 - 433
摘 要：A dual functional CNTs@graphene/CNTs cathode for Li–Se battery was constructed by a CNTs@graphene network and a CNTs interlayer. CNTs were first integrated with graphene to form a three-dimensional（3D） framework and work together as a conductive matrix for Se confinement. The optimized composite cathode delivers a high initial capacity of 575 mAh·g-1 at 0.5 A·g-1 and good rate capacity with a retained capacity of 479 mAh·g-1 at 2.0 A·g-1(73% of the capacity at 0.2 A·g-1). CNTs were further served as an interlayer to confine the diffusion of polyselenides by constructing a thin CNTs layer outside the CNTs@graphene network. An improved initial capacity of 616 mAh·g-1 at 0.5 A·g-1 is achieved with a retained capacity of 538 mAh·g-1 after 80 cycles, indicating the effective dual function of CNTs in this novel cathode construction and great application potential for Li–Se battery.
Jing Li1,2，Chen Zhang3，Cheng-Jun Wu1,2，Ying Tao1,2，Lei Zhang1,2，Quan-Hong Yang1,2
1. School of Chemical Engineering and Technology, Tianjin University2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)3. School of Marine Science and Technology, Tianjin University
摘 要：A dual functional CNTs@graphene/CNTs cathode for Li–Se battery was constructed by a CNTs@graphene network and a CNTs interlayer. CNTs were first integrated with graphene to form a three-dimensional（3D） framework and work together as a conductive matrix for Se confinement. The optimized composite cathode delivers a high initial capacity of 575 mAh·g-1 at 0.5 A·g-1 and good rate capacity with a retained capacity of 479 mAh·g-1 at 2.0 A·g-1(73% of the capacity at 0.2 A·g-1). CNTs were further served as an interlayer to confine the diffusion of polyselenides by constructing a thin CNTs layer outside the CNTs@graphene network. An improved initial capacity of 616 mAh·g-1 at 0.5 A·g-1 is achieved with a retained capacity of 538 mAh·g-1 after 80 cycles, indicating the effective dual function of CNTs in this novel cathode construction and great application potential for Li–Se battery.
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