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Three-Dimensional Superlithiophilic Interphase for Dendrite-Free Lithium Metal Anodes.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-01-10 , DOI: 10.1021/acsami.9b18315
Yun Qiao 1, 2 , Qingling Li 1, 2 , Xin-Bing Cheng 3 , Fuxia Liu 4 , Yange Yang 1, 2 , Zhansheng Lu 4 , Jin Zhao 1, 2 , Jiawei Wu 1, 2 , He Liu 3 , Shuting Yang 1, 2 , Yang Liu 1
Affiliation  

Lithium metal is among the most promising anode candidates of high-energy-density batteries. However, the formed dendrites result in low Coulombic efficiency and serious security issues. Designing lithiophilic sites is one of the effective strategies to control Li deposition. Herein, we propose a three-dimensional lithiophilic N-rich carbon nanofiber with the decoration of ZnO granules as a protective layer for a dendrite-free lithium metal anode. Theoretical evaluation indicates the synergistic effects of lithiophilic ZnO and N-containing functional groups enhance lithium adsorption and trigger uniform deposition. With the lithiophilic interlayer, the lithium deposition overpotential is only ∼20, 50, and 74 mV at 1, 3, and 6 mA cm-2, respectively, which are much lower than those without the functional interlayer (∼55, 130, and 238 mV). The average Coulombic efficiency of lithium stripping and plating is up to ∼97.4% (94.0% for that without the interlayer) at 0.5 mA cm-2. Meanwhile, the Li|LiFePO4 full cell with the superlithiophilic interlayer demonstrates a high capacity retention rate of 99.6% (91.0% for that without the interlayer) over 200 cycles at 1 C. The introduction of the lithiophilic interphase could provide a convenient strategy and guidance to design the configuration for the practical application of Li metal batteries.

中文翻译:

不含树突的锂金属阳极的三维超亲石相。

锂金属是高能量密度电池最有希望的负极材料之一。但是,形成的树枝状晶体导致库仑效率低和严重的安全问题。设计亲锂性位点是控制锂沉积的有效策略之一。在本文中,我们提出了一种具有ZnO颗粒装饰的三维富硫亲硫碳纳米纤维,作为无树突状锂金属阳极的保护层。理论评估表明,亲硫的ZnO和含N的官能团的协同作用增强了锂的吸附并触发了均匀的沉积。对于亲硫中间层,在1、3和6 mA cm-2处,锂沉积超电势分别仅为〜20、50和74 mV,这比没有功能性中间层时的低得多(〜55、130和238 mV)。在0.5 mA cm-2时,锂剥离和镀覆的平均库仑效率高达〜97.4%(对于没有中间层的库仑效率为94.0%)。同时,具有超亲石性中间层的Li | LiFePO4全电池在1 C的200个循环中表现出99.6%的高容量保持率(不具有中间层的情况下为91.0%)。引入亲硫性中间相可提供便利的策略和指导为锂金属电池的实际应用设计配置。
更新日期:2020-01-23
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