A Highly Efficient All‐Solid‐State Lithium/Electrolyte Interface Induced by an Energetic Reaction
A Highly Efficient All‐Solid‐State Lithium/Electrolyte Interface Induced by an Energetic Reaction
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DOI：
10.1002/anie.202004477
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发表时间：
2020-06
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影响因子：
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通讯作者：
Y. Zhong;Yujun Xie;Sooyeon Hwang;Qian Wang;Judy J. Cha;Dong Su;Hailiang Wang
中科院分区：
文献类型：
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作者：
Y. Zhong;Yujun Xie;Sooyeon Hwang;Qian Wang;Judy J. Cha;Dong Su;Hailiang Wang
Zn（NO3）2和Li之间的高能化学反应用于在Li金属和Li6.4 La 3 Zr1.4 Ta0.6 O 12（LLZTO）电解质之间产生固态界面。该中间层由Zn、ZnLix合金、Li 3 N、Li 2 O和其它物质组成，具有与Li金属和LLZTO两者的强亲和力，并为Li+通过界面的传输提供高效的导电通路。夹层的独特结构和性质导致Li金属阳极与在液体电解质中操作的当前最佳Li金属电极相比具有更长的循环寿命、更高的效率和更好的安全性，同时保持相当的容量、速率和过电位。全固态锂||锂电池可以在4 mA cm-2 - 8 mAh cm-2的非常苛刻的电流容量条件下工作。在库仑效率> 99.5%的情况下实现了数千小时的连续循环，而没有枝晶形成或与电解质的副反应。
The energetic chemical reaction between Zn(NO3 )2 and Li is used to create a solid-state interface between Li metal and Li6.4 La3 Zr1.4 Ta0.6 O12 (LLZTO) electrolyte. This interlayer, composed of Zn, ZnLix alloy, Li3 N, Li2 O, and other species, possesses strong affinities with both Li metal and LLZTO and affords highly efficient conductive pathways for Li+ transport through the interface. The unique structure and properties of the interlayer lead to Li metal anodes with longer cycle life, higher efficiency, and better safety compared to the current best Li metal electrodes operating in liquid electrolytes while retaining comparable capacity, rate, and overpotential. All-solid-state Li||Li cells can operate at very demanding current-capacity conditions of 4 mA cm-2 -8 mAh cm-2 . Thousands of hours of continuous cycling are achieved at Coulombic efficiency >99.5 % without dendrite formation or side reactions with the electrolyte.