Work

The Modulation of Cross-Linking Density in Gel Polymer Electrolyte for the Inhibition of Lithium Dendrite

Year: 2024

Type: article

Abstract: The high theoretical capacity and low electrochemical potential make lithium metal the most promising material to replace graphite anode. However, lithium dendrites growth is the key problem that limits the development of lithium metal batteries (LMB). As a solid electrolyte, gel polymer electrolyte (GPE) possesses a certain ability to inhibit the growth of lithium dendrites compared with liquid electrolyte (LE), but the inhibition mechanism is not very clear. In this work, through the regulation of GPE crosslinking density, we verify that the crosslinked GPE network has a certain influence on the solvation structure of lithium ions. The increased crosslinking density of GPE induces the Li+ solvated sheath dominated by CIPs/SSIPs and AGGs, which is conducive to the formation of stable LiF-rich SEIs to resist lithium dendrites. The high crosslinked GPE-based LiFePO4 full battery also exhibits a pretty high capacity retention rate of 99.7% even after 220 cycles at a rate of 0.2C and 99.3% after 140 cycles at a rate of 0.5C. The inhibiting mechanism of lithium dendrites by the crosslinked GPE is described for the first time, which provides a better idea for the design of new GPE.

Source: ACS Applied Electronic Materials

DOI: 10.1021/acsaelm.4c01573

Authors: Huashuo Jin, Wei Hao, Cancan Zhang, Feng Yu, Yong Chen

Institutions: Hainan University, State Key Laboratory of Marine Resource Utilization in South China Sea, Foshan University

Language: English

Topic: Advanced Battery Materials and Technologies

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: green

Funder: National Natural Science Foundation of China