Regulating ion transport in lithium metal batteries via metal‐organic frameworks electrolyte modulator

Author:

Yan Jiaxing1,Li Jiaqi1,Fang Wenqiang1,Gao Yuanhang1,Qin Zuosu1,Sun Mingwei1,Yuan Peng2,Chen Gen1ORCID

Affiliation:

1. School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South University Changsha, Hunan 410083 China

2. Chuangming Battery Technology Co. Ltd. Dongguan, Guangdong 523808 China

Abstract

AbstractLow Li+ transference number in liquid electrolytes can lead to uneven lithium deposition and dendrite growth, reducing coulombic efficiency and cycle life of lithium metal batteries. In this study, metal‐organic frameworks (MOFs) are used as electrolyte modulator to regulate Li+ transport. The ‐NH2 group introduced into MOFs can form hydrogen bonds with anions in the electrolyte, immobilizing these anions and thereby facilitating the migration of cations. As a result, a uniform and dense deposition morphology of lithium was achieved. The Li+ transference number is increased from 0.26 to 0.57. The assembled Li||Li symmetrical cell can stably cycle for over for 900 h with an average overpotential below 20 mV. In addition, the rate performance of the battery can be enhanced.

Publisher

Wiley

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