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Ionic liquid assisted electrochemical coating zinc nanoparticles on carbon cloth as lithium dendrite suppressing host
Science Bulletin ( IF 18.9 ) Pub Date : 2020-03-10 , DOI: 10.1016/j.scib.2020.03.007
Yuhan Li 1 , Yuankun Wang 1 , Yuchuan Shi 1 , Hu Wu 1 , Jiacheng Zeng 1 , Huaitian Bu 2 , Min Zhu 1 , Chunhui Xiao 1 , Yanfeng Zhang 1 , Guoxin Gao 1 , Shujiang Ding 1
Affiliation  

The application of lithium metal anode with high specific capacity and energy density is limited by the volume expansion and pulverization caused by dendrite growth during cycle process. We propose a composite lithium anode by immersing molten lithium on the flexible three-dimensional (3D) carbon cloth scaffold with the zinc nanoparticles. The lithiophilic zinc nanoparticles layer of framework is synthesized by fast and easy electrochemical deposition from ionic liquid avoiding high temperature, high pressure and toxic reagent. The lithium is infused into the 3D lithiophilic framework, the composite anode is obtained. The steady network structure can confine the lithium and lead to Li dendrite restraining and reducing volume change due to the low interfacial resistance and reduce the effective current density, which induced the homogeneous Li growth. Benefiting from this, the Li infused 3D carbon cloth-Zn symmetric battery exhibits a low stripping/plating overpotential (~30 mV) and can be stable over 900 h at 1 mA cm−2. The Li//LiFePO4 battery delivers higher reversible capacity (140 mAh g−1 at 2 C and 120 mAh g−1 at 5 C) and stable cycling for 1500 and 2000 cycles than bare Li.



中文翻译:

离子液体辅助电化学包覆锌纳米碳布作为锂枝晶抑制主体

具有高比容量和能量密度的锂金属负极的应用受到循环过程中枝晶生长引起的体积膨胀和粉化的限制。我们提出了一种复合锂阳极,将熔融锂浸入带有锌纳米颗粒的柔性三维 (3D) 碳布支架上。框架的亲锂锌纳米颗粒层是通过离子液体快速简便的电化学沉积合成的,避免了高温、高压和有毒试剂。将锂注入3D亲锂骨架中,得到复合负极。稳定的网络结构可以限制锂并导致锂枝晶由于低界面电阻而抑制和减少体积变化并降低有效电流密度,这诱导了锂的均匀生长。受益于此,注入锂的 3D 碳布-锌对称电池表现出较低的剥离/电镀过电位(~30 mV),并且在 1 mA cm 下可以稳定超过 900 小时-2。与裸锂相比,Li//LiFePO 4电池具有更高的可逆容量(2 C 时为 140 mAh g -1和 5 C 时为 120 mAh g -1)和 1500 和 2000 次循环的稳定循环。

更新日期:2020-03-10
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