Regulating lithium deposition behavior by electrokinetic effects in a high-zeta-potential h-BN/zinc-lithium alloy for high-performance lithium metal anodes. Issue 10 (21st February 2022)

• Record Type: Journal Article
• Authors: Liu, Shipeng; Zhao, Jingteng; Li, Fang; Zhao, Yingjie; Li, Guoxing
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 10(2022)
• Page Start: 5221
• Page End: 5229
• Publication Date: 2022-02-21
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta10200a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A high-zeta-potential h-BN-doped LiZn alloy promotes strong electrokinetic effects to significantly improve Li-ion transport kinetics, which can effectively suppress Li dendrite growth and enable stable Li metal anodes under harsh conditions. Abstract : The commercial application of lithium metal anodes is impeded by the uncontrollable growth of lithium dendrites and the serious volume change during the cycling process. Here we develop a high-zeta-potential h-BN-doped zinc-lithium alloy (Li-ZB) as an anode to self-drive electrokinetic effects and regulate the lithium deposition behavior to achieve high-performance lithium metal batteries. The high-zeta-potential h-BN in Li-ZB promotes electrokinetic surface conduction and electroosmosis within the porous Zn-BN framework formed after lithium stripping, which in turn greatly enhances lithium-ion transport kinetics. Uniform Zn distribution in Li-ZB enables homogenous lithium nucleation and a reduced nucleation barrier. The synergistic effect of electrokinetic effect enhanced lithium-ion transport and regulated lithium nucleation behavior effectively suppresses lithium dendrite growth and mitigates the volume change issue at high deposition capacities (8 mA h cm −2 ), high current densities (10 mA cm −2 ), and a high rate (5C). The Li-ZB‖LiNi0.8 Co0.1 Mn0.1 O2 full cells exhibit excellent cycling stability and capacity retention, as well as significantly enhanced CE, even under lean-electrolyte conditions ( e.g., 3 μL mA h −1 ). The designed Li-ZB anodes show great potential application for next-generation lithium metal batteries with high energy density.