用于稳定锂金属电池的原位形成的亲锂Ni3S2@Ni集流体,Sustainable Energy & Fuels

当前位置： X-MOL 学术 › Sustain. Energy Fuels › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

用于稳定锂金属电池的原位形成的亲锂Ni3S2@Ni集流体
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2023-08-29 , DOI: 10.1039/d3se00798g
Mengpei Qi _{1,

2} , Lingling Xie _{2,

3} , Qing Han _{1,

2} , Xuejing Qiu _{2,

3} , Swati Katiyar ₄ , Xinhua Liu ₅ , Shichun Yang ₅ , Limin Zhu _{1,

2} , Xianyong Wu ₄ , Libao Chen ₆ , Xiaoyu Cao _{1,

2}

Affiliation

与标准氢电极相比，锂金属负极作为锂存储材料引起了人们的极大兴趣，具有最高的比容量（3860 mA hg ^{-1 ）和最低的氧化还原电位（-3.04 V）以及可持续性。}然而，极端的枝晶生长、严重的锂沉积和巨大的体积变化严重阻碍了锂负极的实际进展。为了解决这些问题，研究人员提出构建三维（3D）集流体，它可以调节锂沉积并提高循环稳定性。在此，我们在多孔镍集流体上原位生长亲锂Ni ₃ S _{2纳米线阵列（以下表示为Ni}₃ S ₂@Ni）通过简单的水热反应，显着提高了锂金属负极的性能。这种Ni ₃ S ₂ @Ni复合集流体具有相对均匀和开放的微纳米结构，有利于Li ⁺离子的迁移/扩散，并改善电极-电解质界面性能。此外，Ni ₃ S _{2 @Ni复合集流体在2 mA cm}^-2下实现了900小时的延长的锂镀/脱锂寿命，并且在对称电池中没有短路。此外，由复合集流体和LiFePO _{4组装而成的全电池}正极表现出出色的循环稳定性，1C下循环500次后容量保持率为80.6%。我们提出的3D Ni ₃ S ₂ @Ni复合集电器将进一步推动稳定锂金属负极的发展。

"点击查看英文标题和摘要"

An in situ formed lithiophilic Ni3S2@Ni current collector for stable lithium metal batteries

Attracting immense interest as a lithium storage material, lithium metal anodes boast the highest specific capacity of 3860 mA h g⁻¹ and lowest redox potential of −3.04 V, compared to the standard hydrogen electrode, and sustainability. Nevertheless, extreme dendrite growth, severe lithium deposition, and enormous volume alteration have seriously impeded the practical progress of lithium anodes. To address these problems, researchers have proposed to construct three-dimensional (3D) current collectors, which can adjust Li deposition and improve cycle stability. Herein, we in situ grow lithiophilic Ni₃S₂ nanowire arrays on a porous nickel current collector (hereinafter denoted as Ni₃S₂@Ni) by a simple hydrothermal reaction, which significantly improved the Li metal anode performance. This Ni₃S₂@Ni composite current collector has a relatively uniform and open micro–nano structure, which facilitates Li⁺ ion migration/diffusion and also improves electrode–electrolyte interfacial properties. In addition, the Ni₃S₂@Ni composite current collector achieves a prolonged lithium plating/stripping lifespan of 900 hours at 2 mA cm⁻² without short circuit in symmetrical batteries. Furthermore, a full cell assembled with the composite current collector and a LiFePO₄ cathode demonstrates outstanding cycling stability, where the capacity retention is 80.6% after 500 cycles at 1C. Our proposed 3D Ni₃S₂@Ni composite current collector will further boost the development of stable Li metal anodes.

更新日期：2023-08-29

点击分享查看原文

点击收藏

阅读更多本刊新发论文