材料科学
阳极
石墨烯
阴极
锂(药物)
成核
复合数
纳米技术
化学工程
复合材料
电极
医学
工程类
内分泌学
物理化学
有机化学
化学
作者
Qingshuai Xu,Xianfeng Yang,Mumin Rao,Dingchang Lin,Kai Yan,Ruian Du,Jiantie Xu,Yuegang Zhang,Daiqi Ye,Shihe Yang,Guangmin Zhou,Yingying Lü,Yongcai Qiu
标识
DOI:10.1016/j.ensm.2019.12.028
摘要
The big challenge for practical lithium metal batteries is how to make full and reversible utilization of lithium anode. The preformed three-dimensional (3D) porous framework with numerous lithium nucleation sites is able to guide the lithium deposition in the cavity of 3D framework, suppressing the dendrite growth and dimensional change. Herein, we design a nanocapsule structure for lithium metal anodes consisting of 3D graphene with MgxLiy seeds inside. The 3D composite anode not only can be prepared in a simple and scalable process, but also can meet the requirements for both high energy density and long cycle life in the practical cells. During the observation of lithium deposition by transmission electron microscope, it was found that lithium metal was mainly deposited around the MgxLiy seeds within 3D graphene. Thereafter, when the composite anodes are well paired with the commercial LiFePO4 cathodes in coil cells and NCM811 (LiNi0.8Co0.1Mn0.1O2) cathodes in pouch batteries, they are able to deliver the energy density exceeding 350 Wh·kg−1 and long cycle life (>150 cycles) with high energy retention (>85%). The 3D lithium metal/graphene composite anode in the present work provides a promising new avenue for the fabrication of high energy density Li-metal batteries.
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