Engineering the Li-ion flux and interfacial chemistry toward a stable Li metal anode via a simple separator coating strategy

Due to its remarkably high specific capacity of 3860 mA h g −1 and low reduction potential (−3.04 V vs. SHE), lithium metal has been identified as an ideal anode candidate for high-energy density lithium-ion cells. However, the growth of lithium dendrites caused by the deposition of lithium metal ca...

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Bibliographic Details
Published in:New journal of chemistry 2023-05, Vol.47 (17), p.7986-7994
Main Authors: Zhao, Sheng, Ma, Mingze, Gao, Liangyu, Gu, LanHui, Chen, Minfeng, Han, Guangdong, Yang, Tingrui, Chen, Jizhang, Qi, Dongfeng, Wang, Peng, Han, Xiang
Format: Article
Language:English
Subjects:
Coating
Deposition
Discharge
Electric cells
Indium tin oxides
Ion channels
Ion flux
Lithium
Lithium-ion batteries
Separators
Short circuits
Voltage stability
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Summary:Due to its remarkably high specific capacity of 3860 mA h g −1 and low reduction potential (−3.04 V vs. SHE), lithium metal has been identified as an ideal anode candidate for high-energy density lithium-ion cells. However, the growth of lithium dendrites caused by the deposition of lithium metal can affect the charge and discharge behavior of a cell and lead to short circuit, which is a safety concern and hinders its practical applications. Here, we prepare a composite separator polypropylene-Li 1+ x Al x Ti 2− x (PO 4 ) 3 -indium tin oxide (PP–LATP–ITO) via a simple slurry coating method. The coating of LATP-ITO demonstrates unique advantages of Li-ion deposition as well as interfacial chemistry. Firstly, lithiophilic PP-ITO helps to reduce the energy barrier for Li deposition. In addition, the three-dimensional ion channels can regulate the transport of lithium ions and induce uniform Li metal plating and stripping. Furthermore, the in situ formed interface comprising of a Li–In alloy, Li 3 PO 4 and LiF enables stable interfacial chemistry. As a result, compared with the PP separators, the voltage stability of the composite separators in Li–Li symmetric cells is greatly improved during the charge and discharge cycling. In addition, LCO/Li cells with the composite separator PP–LATP–ITO exhibit a higher specific capacity (140 mA h g −1 ) and good capacity maintenance during cycling. This work proposes a separator coating strategy that can inhibit dendrite formation and stabilize the lithium metal interface.
ISSN:1144-0546
1369-9261
DOI:10.1039/D3NJ01086D