Lei Meina, Wang Jian-Gan, Ren Lingbo, Nan Ding, Shen Chao, Xie Keyu, Liu Xingrui
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering , Northwestern Polytechnical University and Shaanxi Joint Lab of Graphene (NPU) , Xi'an 710072 , China.
School of Materials Science and Engineering , Inner Mongolia University of Technology , Aimin Street 49 , Hohhot 010051 , China.
ACS Appl Mater Interfaces. 2019 Aug 28;11(34):30992-30998. doi: 10.1021/acsami.9b09975. Epub 2019 Aug 16.
Lithium metal is considered to be a holy grail of the battery anode chemistry due to its large specific capacity. Nevertheless, the uncontrollable formation of lithium dendrites resulting from uneven lithium nucleation/growth and the associated safety risk and short cyclability severely impede the practical use of lithium metal anodes. Herein, we demonstrate a highly lithiophilic cobalt nitride nanobrush on a Ni foam (CoN/NF) current collector as a stable three-dimensional (3D) framework to inhibit the dendrite formation of lithium. The 3D CoN/NF nanobrush electrode could enable a low nucleation overpotential for homogeneous deposition of dendrite-free lithium. Compared to the CoO/NF counterpart and the bare Cu foil/Ni foam, the CoN/NF nanobrush host is of great benefit for enhanced Coulombic efficiencies and longer lifespan at various current densities. The present work will offer a new insight for the exploration of the highly lithiophilic scaffold based on metal nitrides toward high-performance lithium metal anodes.
锂金属因其高比容量而被认为是电池负极化学领域的圣杯。然而，锂不均匀成核/生长导致的锂枝晶不可控形成以及相关的安全风险和短循环寿命严重阻碍了锂金属负极的实际应用。在此，我们展示了一种在泡沫镍（CoN/NF）集流体上的高亲锂氮化钴纳米刷，作为抑制锂枝晶形成的稳定三维（3D）框架。3D CoN/NF纳米刷电极能够实现较低的成核过电位，以实现无枝晶锂的均匀沉积。与CoO/NF对应物和裸铜箔/泡沫镍相比，CoN/NF纳米刷主体在各种电流密度下对提高库仑效率和延长寿命具有很大益处。目前的工作将为探索基于金属氮化物的高亲锂支架用于高性能锂金属负极提供新的见解。
