Nano Energy ( IF 16.8 ) Pub Date : 2017-05-11 , DOI: 10.1016/j.nanoen.2017.05.015
Chengbin Jin , Ouwei Sheng , Jianmin Luo , Huadong Yuan , Cong Fang , Wenkui Zhang , Hui Huang , Yongping Gan , Yang Xia , Chu Liang , Jun Zhang , Xinyong Tao
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Lithium metal as an attractive anode material has been widely used in the advanced energy storage technology such as lithium-sulfur and lithium-air batteries. However, suffering from the uncontrollable deposition, growth of lithium dendrite and the serious volume change within cycling process, the commercial application of lithium anode is impeded by the safety hazards and limited span-life. Here, we demonstrate a kind of bamboo-derived 3D hierarchical porous carbon decorated by ZnO quantum dots which can serve as a lithiophilic scaffold for dendrite-free Li metal anode. This carbon scaffold is stable against the serious volumetric change during cycles. In addition, the 3D porous scaffold can reduce the effective local current density. Most importantly, the lithiophilic ZnO quantum dots within the carbon can be used to induce lithium deposition. Notably, lithium metal up to 131 mAh cm−2 can be confined within [email protected], achieving acceptable volume expansion, considerable reduction in overpotential and effective dendrite suppression. Thus, 3D Li within [email protected] scaffold could exhibit better capability and much lower voltage hysteresis when compared with Li foil in cells paired with LiCoO2. The function of the ZnO decorated 3D hierarchical porous carbon scaffold might provide innovative insights into the design principles for metallic lithium anodes.
中文翻译:
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嵌入锂化多孔基质中的3D锂金属,用于稳定的锂金属电池
锂金属作为有吸引力的负极材料已广泛用于先进的储能技术,例如锂硫和锂空气电池。然而,由于循环过程中无法控制的沉积,锂枝晶的生长以及体积的严重变化,锂阳极的商业应用受到安全隐患和有限的使用寿命的限制。在这里,我们演示了一种由ZnO量子点修饰的竹制3D分层多孔碳,该碳可以用作无枝晶锂金属阳极的亲硫骨架。该碳支架在循环过程中抵抗严重的体积变化是稳定的。此外,3D多孔支架可以降低有效局部电流密度。最重要的是,碳中的亲硫性ZnO量子点可用于诱导锂沉积。可以将−2限制在[电子邮件保护的范围内],以实现可接受的体积扩展,显着降低过电势并有效抑制枝晶。因此,与LiCoO 2配对的电池相比,[受电子邮件保护的]支架中的3D Li可能表现出更好的性能和更低的电压滞后。ZnO装饰的3D分层多孔碳支架的功能可能为金属锂阳极的设计原理提供创新见解。