Cai Kangning, Zhong Geng, Zheng Han, Kang Guohuang, Yin Rui, Jia Tianqi, Huang Shifei, Yu Kuang, Peng Lele, Kang Feiyu, Cao Yidan
Shenzhen Geim Graphene Center, Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen518055, China.
Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen518055, China.
ACS Appl Mater Interfaces. 2022 Oct 12;14(40):45433-45443. doi: 10.1021/acsami.2c13359. Epub 2022 Sep 30.
The compatibility of current collectors with reactive Li is key to inducing stable Li cycling and prolonged cycle life of lean Li-metal batteries. Herein, a thin and uniform layer of Ni-P complex was built on the surface of a Cu current collector (NiP@Cu) via an efficient, controllable, and cost-effective electroless plating method. The thickness, morphology, composition, and roughness of the Ni-P deposition were successfully regulated. Lithiophilicity of the current collector was greatly improved by Ni-P deposition, which effectively reduced the Li nucleation overpotential and suppressed the Li dendrite growth. In addition, NiP@Cu promoted an inorganic LiF/LiP-rich solid electrolyte interphase to facilitate interfacial charge transfer and eliminate excessive side reactions between Li and the electrolyte. As a result, the Coulombic efficiency of half-cells remained above 98.5% for more than 400 cycles at 0.5 mA/cm and 98.2% for more than 250 cycles at 1 mA/cm. Full cells with NiP@Cu also showed superior performance compared to those with bare Cu. This work proposes a promising surface modification method to develop a stable, dendrite-free, and cost-effective anode current collector for high-energy-density lean Li-metal batteries.
集流体与活性锂的兼容性是实现贫锂金属电池稳定锂循环和延长循环寿命的关键。在此，通过一种高效、可控且经济高效的化学镀方法，在铜集流体（NiP@Cu）表面构建了一层薄而均匀的Ni-P复合物层。成功调控了Ni-P沉积层的厚度、形貌、成分和粗糙度。通过Ni-P沉积，集流体的亲锂性大大提高，有效降低了锂成核过电位并抑制了锂枝晶生长。此外，NiP@Cu促进了富含无机LiF/LiP的固体电解质界面的形成，以促进界面电荷转移并消除锂与电解质之间过多的副反应。结果，半电池在0.5 mA/cm下400多个循环的库仑效率保持在98.5%以上，在1 mA/cm下250多个循环的库仑效率保持在98.2%以上。与裸铜集流体相比，含NiP@Cu的全电池也表现出优异的性能。这项工作提出了一种有前景的表面改性方法，以开发用于高能量密度贫锂金属电池的稳定、无枝晶且经济高效的阳极集流体。
