Bissannagari Murali, Shaik Mahammad Rafi, Cho Kuk Young, Kim Jihoon, Yoon Sukeun
Division of Advanced Materials Engineering, Kongju National University, Chungnam 31080, Republic of Korea.
Department of Materials Science and Chemical Engineering, Hanyang University, Gyeonggi 15588, Republic of Korea.
ACS Appl Mater Interfaces. 2022 Aug 10;14(31):35613-35622. doi: 10.1021/acsami.2c07551. Epub 2022 Jul 27.
With the growing interest in suppressing greenhouse gas emissions from fossil fuel combustion, the implementation of electrical energy storage devices for efficiently utilizing renewable energy is expanding worldwide. Zn-ion batteries are attractive for energy storage because of their safety, eco-friendliness, high energy density, and low cost. However, their commercialization is hindered by the poor rechargeability of the zinc anode because of Zn dendrite growth and hydrogen evolution. Herein, we present the application of an artificial layer composed of bimodal BaTiO particles on Zn metal to boost the dielectric properties and thus enhance the reversibility of Zn anodes during long-term cycling. The BaTiO layer induces electric polarization under external electric fields, causing the Zn ions to move sequentially toward the Zn anode. Moreover, its mechanical characteristics alleviate the volume changes between the BaTiO layer and Zn metal. Consequently, Zn dendrite growth is effectively inhibited, and the electrochemical performance is significantly improved in Zn|Zn symmetric cells, resulting in a low overvoltage (39 mV) and stable cycling (800 h) at 1 mA cm. Moreover, the Zn-ion full cell using an α-MnO cathode exhibits consistent capacity retention up to 380 cycles. This study demonstrates a new strategy to economically and readily suppress dendrite formation by using bimodal dielectric particles as artificial layers to stabilize metal-based batteries.
随着人们对抑制化石燃料燃烧产生的温室气体排放的兴趣日益浓厚，用于高效利用可再生能源的电能存储设备在全球范围内的应用正在不断扩大。锌离子电池因其安全性、生态友好性、高能量密度和低成本而在能量存储方面具有吸引力。然而，由于锌枝晶生长和析氢导致锌负极的充电性能较差，阻碍了它们的商业化。在此，我们展示了一种由双峰BaTiO颗粒组成的人工层在锌金属上的应用，以提高介电性能，从而增强锌负极在长期循环过程中的可逆性。BaTiO层在外部电场下会产生电极化，使锌离子依次向锌负极移动。此外，其机械特性减轻了BaTiO层与锌金属之间的体积变化。因此，在Zn|Zn对称电池中，锌枝晶的生长得到有效抑制，电化学性能显著提高，在1 mA cm下实现了低过电压（39 mV）和稳定循环（800 h）。此外，使用α-MnO正极的锌离子全电池在高达380次循环中表现出一致的容量保持率。这项研究展示了一种新策略，即通过使用双峰介电颗粒作为人工层来稳定金属基电池，从而经济且容易地抑制枝晶形成。
