Synergistic Grain Refinement and Crystal Plane Reconstruction via Shot-Peening for Highly Reversible Zn Anodes

en This link goes to a English section zh This link goes to a Chinese section Aqueous Zn-ion batteries (AZIBs) are expected to become one of the most promising candidates for large-scale energy storage, but are impeded by uncontrollable dendrite growth and parasitic reactions. In this study, we propose a simple mechanical shot-peening (SP) approach for restructuring commercial Zn foils into highly exposed (002)-textured crystal planes while inducing grain refinement. The SP process effectively eliminates the surface passivation layer and structural defects, enhances the mechanical properties and corrosion resistance of the electrode surface, and provides abundant active sites for Zn nucleation. This promotes homogeneous and smooth deposition of zinc and ensures a uniformly distributed electric field, thereby suppressing dendrite growth and reducing side reactions. Consequently, the SP-treated Zn (SP-Zn) anode enables a symmetric cell that exhibits impressive reversibility and stable cycling for over 5000 h at 2 mA cm −2 , and an SP-Zn||MnVO full cell delivers 81% capacity retention after 2000 cycles at 5 A g −1 . This simple and cost-effective SP strategy offers a practical approach to fabricating high-performance Zn metal anodes, providing a scalable strategy for practical AZIB applications. 摘要 en This link goes to a English section zh This link goes to a Chinese section 水系锌离子电池(AZIBs)有望成为大规模储能领域最具前景的候选方案之一,但其发展受限于不可控的枝晶生长和寄生反应。本研究提出了一种简单的机械喷丸(SP)处理方法,对商用锌箔进行重构,以诱导高度暴露的(002)织构晶面,同时实现了晶粒细化。SP工艺有效去除了表面钝化层和结构缺陷,改善了电极的力学和耐腐蚀性能,并为锌成核提供了丰富的活性位点。可有效这促进锌的均匀沉积,确保了电场的均匀分布,从而抑制了枝晶生长并减少副反应。结果表明,经SP处理的锌(SP-Zn)负极组装的对称电池在电流密度为2 mA cm − 2 的测试条件下表现出优异的可逆性和稳定性,循环时间超过了5000小时,SP-Zn||MnVO全电池在5 A g −1 的测试条件下循环2000次后容量保持率达81%。该简便且低成本的SP策略为制备高性能锌金属负极提供了一种实用途径,为AZIBs的实际应用提供了一种可规模化的解决方案。