Straw–Brick‐Like Carbon Fiber Cloth/Lithium Composite Electrode as an Advanced Lithium Metal Anode,Small Methods

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Straw–Brick‐Like Carbon Fiber Cloth/Lithium Composite Electrode as an Advanced Lithium Metal Anode
Small Methods ( IF 10.7 ) Pub Date : 2018-04-30 , DOI: 10.1002/smtd.201800035
Sufu Liu ₁ , Xinhui Xia ₁ , Zhujun Yao ₁ , Jianbo Wu ₂ , Liyuan Zhang ₁ , Shengjue Deng ₁ , Chengao Zhou ₁ , Shenghui Shen ₁ , Xiuli Wang ₁ , Jiangping Tu ₁

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Because of its highest capacity and lowest anode potential, lithium (Li) metal anode is extremely attractive to the next‐generation rechargeable batteries. However, low Coulombic efficiency, uncontrolled dendritic growth, and poor solid electrolyte interphase (SEI) during the Li stripping/plating process hinder its practical application. Here, a novel straw–brick‐like carbon fiber cloth/lithium (CFC/Li) composite electrode is designed by embedding lithium into 3D carbon cloth matrix via a facile ZnO‐induced molten method. The ZnO layer on the CFC provides bonding interactions for encapsulation of molten Li metal to form straw–brick‐like CFC/Li composite electrode. Compared with bare Li metal electrode, the as‐obtained CFC/Li electrode presents much less fluctuant stripping/plating profiles with lower voltage hysteresis (120 mV at 3 mA cm⁻²) and more stable SEI structure. When coupled with a LiFePO₄ cathode, the CFC/Li anode demonstrates a good suitability in full cells. This reinforcement is due to the unique straw–brick‐like structure with good conductive framework leading to greatly decreased current density, and effective suppression of volume change and dendrite. This modification strategy on the Li metal provides an easy straightforward option for construction of advanced anodes for Li‐metal batteries.

中文翻译：

稻草砖样碳纤维布/锂复合电极作为高级锂金属阳极

由于锂（Li）金属阳极具有最高的容量和最低的阳极电势，因此对下一代可充电电池极具吸引力。然而，在Li汽提/电镀过程中，库仑效率低，树突生长不受控制以及固体电解质中间相（SEI）较差，阻碍了其实际应用。在这里，通过一种方便的ZnO诱导的熔融方法将锂嵌入3D碳布基体中，设计了一种新颖的类似草砖般的碳纤维布/锂（CFC / Li）复合电极。CFC上的ZnO层为熔融的Li金属的包封提供了键合相互作用，从而形成了类似草砖般的CFC / Li复合电极。与裸露的锂金属电极相比，如此获得的CFC / Li电极具有更低的电压滞后性（3 mA时为120 mV），波动的剥离/镀层轮廓要少得多^-2）和更稳定的SEI结构。当与LiFePO ₄阴极耦合时，CFC / Li阳极在全电池中显示出良好的适用性。这种增强是由于独特的稻草砖样结构以及良好的导电框架导致电流密度大大降低，并有效抑制了体积变化和枝晶。锂金属的这种改性策略为锂金属电池的高级阳极的构造提供了一个简单而直接的选择。

更新日期：2018-04-30

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