In Situ Conversion of Cu3P Nanowires to Mixed Ion/Electron‐Conducting Skeleton for Homogeneous Lithium Deposition,Advanced Energy Materials

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In Situ Conversion of Cu3P Nanowires to Mixed Ion/Electron‐Conducting Skeleton for Homogeneous Lithium Deposition
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-11-26 , DOI: 10.1002/aenm.201902989
Changzhi Sun _{1,

2,

3} , Aming Lin _{2,

3} , Wenwen Li _{1,

2,

3} , Jun Jin _{1,

2,

3} , Yiyang Sun _{2,

3} , Jianhua Yang _{1,

2,

3} , Zhaoyin Wen _{1,

2,

3}

Affiliation

The introduction of 3D wettable current collectors is one of the practical strategies toward realizing high reversibility of lithium (Li) metal anodes, yet its effect is usually insufficient owing to single electron‐conductive skeleton. Here, homogeneous Li deposition behavior and enhanced Coulombic efficiency is reported for electrochemically lithiated Cu₃P nanowires, owing to the formation of a mixed ion/electron‐conducting skeleton (MIECS). In particular, by evaluating the Gibbs free energy change, the possible chemical reaction between Cu₃P and molten Li is used to construct a MIECS containing Li₃P and Cu–Li alloy phase. The successful conversion of Cu₃P nanowires to Li₃P and Cu–Li alloy nanocomposite not only greatly reduces the surface energy between molten Li and Cu₃P, but also induces uniform Li stripping/plating behavior via balanced ion/electron transport. Thus, the as‐obtained Li@MIECS composite anode displays superior cycling stability in both symmetric cells and full cells. This work provides a promising option for the preparation of high‐performance composite Li anodes containing MIECS by thermally pre‐storing Li.

中文翻译：

Cu3P纳米线的原位转化为离子/电子混合骨架，用于均相锂沉积

引入3D可湿性集电器是实现锂（Li）金属阳极高可逆性的实用策略之一，但是由于单个电子导电骨架，其效果通常不足。在这里，由于形成了混合的离子/电子导电骨架（MIECS），据报道电化学锂化的Cu ₃ P纳米线具有均匀的Li沉积行为和增强的库仑效率。特别是，通过评估吉布斯自由能变化，Cu ₃ P和熔融Li之间可能发生的化学反应被用于构建包含Li ₃ P和Cu-Li合金相的MIECS 。Cu ₃ P纳米线成功转化为Li ₃P和Cu-Li合金纳米复合材料不仅大大降低了熔融Li和Cu ₃ P之间的表面能，而且还通过平衡的离子/电子传输引起均匀的Li剥离/镀覆行为。因此，如此获得的Li @ MIECS复合阳极在对称电池和全电池中均显示出优异的循环稳定性。这项工作为通过预热锂制备含MIECS的高性能复合锂阳极提供了一个有前途的选择。

更新日期：2020-01-22

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