Affiliation:
1. School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South University Changsha 410083 P. R. China
2. Zhongyuan Critical Metals Laboratory School of Chemical Engineering Zhengzhou University Zhengzhou 450001 P. R. China
3. International Center for Materials Nanoarchitectonics (WPI‐MANA) National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba 305‐0044 Japan
Abstract
AbstractLiNO3 is an effective additive for improving the performance of Li metal anodes. However, the practical application of LiNO3 is limited due to its poor solubility. Here, a novel electrolyte additive of MgAl layered double hydroxides (LDHs) with open interlayered anionic vacancies is proposed. The electropositive MgAl LDHs promote the spontaneous coordination of NO3− into anionic vacancies of LDH interlayers via memory effect, rehydrating to original NO3−‐MgAl LDHs structure and accelerating LiNO3 dissolution. The reconstructed NO3−‐MgAl LDHs play a crucial role as sustainable nitrate resources, preventing partial NO3− from participating in the Li+ solvent sheath to reduce the solvation binding energy. Moreover, MgAl LDHs absorb the anions due to electrostatic attraction, accounting for more dissociated Li+ and active Li+ migration in carbonate electrolytes. NO3− stored in MgAl LDHs is also preferentially reduced to form Li3N‐rich solid electrolyte interphase (SEI), decreasing the activation energy barrier for Li+ transport and striving to form a uniform Li deposition. The cells assembled with MgAl LDHs and LiNO3 additives deliver high Coulombic efficiency, excellent rate capability, and high capacity retention. This strategy provides new insights into LiNO3‐promotor design and excavates the potential of LDHs materials for Li metal batteries.
Funder
National Natural Science Foundation of China
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment
Cited by
11 articles.
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