Regulating Li electrodeposition by constructing Cu–Sn nanotube thin layer for reliable and robust anode-free all-solid-state batteries

IF 19.5 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Carbon Energy Pub Date : 2024-09-12 DOI:10.1002/cey2.610
Jaeik Kim, Seungwoo Lee, Jeongheon Kim, Joonhyeok Park, Hyungjun Lee, Jiseok Kwon, Seho Sun, Junghyun Choi, Ungyu Paik, Taeseup Song
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Abstract

Anode-free all-solid-state batteries (AF-ASSBs) have received significant attention as a next-generation battery system due to their high energy density and safety. However, this system still faces challenges, such as poor Coulombic efficiency and short-circuiting caused by Li dendrite growth. In this study, the AF-ASSBs are demonstrated with reliable and robust electrochemical properties by employing Cu–Sn nanotube (NT) thin layer (~1 µm) on the Cu current collector for regulating Li electrodeposition. LixSn phases with high Li-ion diffusivity in the lithiated Cu–Sn NT layer enable facile Li diffusion along with its one-dimensional hollow geometry. The unique structure, in which Li electrodeposition takes place between the Cu–Sn NT layer and the current collector by the Coble creep mechanism, improves cell durability by preventing solid electrolyte (SE) decomposition and Li dendrite growth. Furthermore, the large surface area of the Cu–Sn NT layer ensures close contact with the SE layer, leading to a reduced lithiation overpotential compared to that of a flat Cu–Sn layer. The Cu–Sn NT layer also maintains its structural integrity owing to its high mechanical properties and porous nature, which could further alleviate the mechanical stress. The LiNi0.8Co0.1Mn0.1O2 (NCM)|SE|Cu–Sn NT@Cu cell with a practical capacity of 2.9 mAh cm−2 exhibits 83.8% cycle retention after 150 cycles and an average Coulombic efficiency of 99.85% at room temperature. It also demonstrates a critical current density 4.5 times higher compared to the NCM|SE|Cu cell.

Abstract Image

通过构建铜-锡纳米管薄层调节锂的电沉积,实现可靠、稳健的无阳极全固态电池
无阳极全固态电池(AF-ASSB)因其高能量密度和安全性而作为下一代电池系统受到广泛关注。然而,这种系统仍然面临着一些挑战,如库仑效率低和锂枝晶生长引起的短路。在本研究中,通过在铜集流器上使用铜-锰纳米管(NT)薄层(约 1 µm)来调节锂的电沉积,证明了 AF-ASSBs 具有可靠而稳定的电化学特性。锂化 Cu-Sn 纳米管层中具有高锂离子扩散率的 LixSn 相与其一维中空几何形状一起实现了锂的便捷扩散。在这种独特的结构中,锂通过科布尔蠕变机制电沉积在 Cu-Sn NT 层和集流器之间,通过防止固态电解质(SE)分解和锂枝晶生长,提高了电池的耐用性。此外,NT 铜硒层的大表面积确保了与 SE 层的紧密接触,从而降低了锂过电位。此外,由于铜-锡新界层具有较高的机械性能和多孔性,它还能保持结构的完整性,从而进一步减轻机械应力。实用容量为 2.9 mAh cm-2 的 LiNi0.8Co0.1Mn0.1O2 (NCM)|SE|Cu-Sn NT@Cu 电池在室温下经过 150 次循环后显示出 83.8% 的循环保持率和 99.85% 的平均库仑效率。它的临界电流密度也比 NCM|SE|Cu 电池高出 4.5 倍。
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来源期刊
Carbon Energy
Carbon Energy Multiple-
CiteScore
25.70
自引率
10.70%
发文量
116
审稿时长
4 weeks
期刊介绍: Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.
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