Affiliation:
1. Key Laboratory for New Functional Materials of Ministry of Education Faculty of Materials and Manufacturing Beijing University of Technology Beijing 100124 China
2. Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China
Abstract
AbstractAchieving a high Li+ transference number is an effective strategy to inhibit the nucleation of lithium dendrites on the metal anode according to classical Sand's time principle. However, improving the Li+ transference number usually causes aloss of ionic conductivity of lithium metal batteries. Here, inspired by biological ion channels tuning ion transport, an electronegative nanochannels separator is developed to accelerate Li+ transport for enabling dendrite‐free and high‐rate lithium metal anodes. Benefiting from selective and fast Li+ transport, the electronegative nanochannels separator can simultaneously achieve high Li+ transference number (0.77) and high Li+ conductivity (1.36 mS cm−2) within a liquid lithium metal battery. Such an optimization of Li+ transport dynamics can significantly prolong the nucleation time of lithium dendrite and thus effectively suppress dendritic growth, which contributes to an extremely stable Li plating/stripping cycling for over 2000 h at a high current density of 5 mA cm−2. When assembled into lithium metal batteries, the electronegative nanochannels separator enables superior comprehensive electrochemical performance compared with the commercial polyolefin one. This work provides new insights into the design of functional separators toward dendrite‐free and high‐rate liquid lithium metal batteries.
Funder
Beijing Nova Program
Natural Science Foundation of Beijing Municipality
National Natural Science Foundation of China
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment
Cited by
35 articles.
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