Reversible epitaxial electrodeposition of metals in battery anodes
Reversible epitaxial electrodeposition of metals in battery anodes
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DOI：
10.1126/science.aax6873
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发表时间：
2019-11-01
期刊：
影响因子：
56.9
通讯作者：
Archer, Lynden A.
中科院分区：
文献类型：
--
作者：
Zheng, Jingxu;Zhao, Qing;Archer, Lynden A.
金属在液-固界面处形成不规则和非平面电沉积物的倾向已经成为使用金属阳极的高能可再充电电池的基本障碍。我们报告了一种外延机制来调节金属阳极的成核、生长和可逆性。晶体学，表面纹理，和电化学标准的金属可逆外延电沉积的定义和其有效性证明使用锌（Zn），一种安全，低成本，高能量密度的电池阳极材料。石墨烯，具有低的晶格失配的锌，被证明是有效的驱动沉积的锌与锁定的晶体取向关系。所得的外延Zn阳极在中等和高速率下在数千次循环中实现了优异的可逆性。金属的可逆电化学外延提供了通向具有高可逆性的能量密度电池的一般途径。
The propensity of metals to form irregular and nonplanar electrodeposits at liquid-solid interfaces has emerged as a fundamental barrier to high-energy, rechargeable batteries that use metal anodes. We report an epitaxial mechanism to regulate nucleation, growth, and reversibility of metal anodes. The crystallographic, surface texturing, and electrochemical criteria for reversible epitaxial electrodeposition of metals are defined and their effectiveness demonstrated by using zinc (Zn), a safe, low-cost, and energy-dense battery anode material. Graphene, with a low lattice mismatch for Zn, is shown to be effective in driving deposition of Zn with a locked crystallographic orientation relation. The resultant epitaxial Zn anodes achieve exceptional reversibility over thousands of cycles at moderate and high rates. Reversible electrochemical epitaxy of metals provides a general pathway toward energy-dense batteries with high reversibility.