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journal article·2026-03Open access

Lewis Acid‐Base Effects on Molecular Structure and Charge Density in Solid Polymer Electrolytes for Solid‐State Batteries

Wonmi Lee, Seung‐Min Lee, Min Kyung Kim, Juho Lee, Junhyeok Hwang, Jeongsik Choi, Sungbin Jang, Seok Ju Kang, Sung‐Kyun Jung, Hyun‐Wook Lee, Jinsoo Kim

Small· Volume 22· Issue 17
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Abstract

ABSTRACT Solid polymer electrolytes (SPEs) are critical for advancing the safety and performance of solid‐state batteries (SSBs). However, challenges such as low ionic conductivity, limited mechanical strength, and narrow electrochemical stability windows hinder their widespread adoption. This study investigates the role of lithium salt formulation, specifically lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and a binary mixture of the two, on the molecular structure and charge density of poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP)‐based SPEs. Through comprehensive characterization, we demonstrate that the choice of lithium salt profoundly affects the crystallinity, dehydrofluorination degree, and ionic conductivity of SPEs. Notably, the binary salt mixture provides a balanced improvement in ionic conductivity (4.93 × 10 −4 S/cm at 20°C) and mechanical strength (127 MPa), alongside a broad electrochemical stability window. These findings suggest that strategic lithium salt formulation can significantly enhance the overall performance of SPEs, paving the way for their effective use in next‐generation SSBs.
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Research context

Energy storagePolymers

OpenAlex topics: Advanced Battery Materials and Technologies · Dielectric materials and actuators · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Ulsan Advanced Energy Technology R&D Center Korea Institute of Energy Research Ulsan Republic of Korea

Department of Chemical Engineering Kongju National University Chungnam Republic of Korea

Department of Energy Engineering School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan Republic of Korea

Department of Nano Fusion Technology Pusan National University Busan Republic of Korea

Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu Republic of Korea

School of Transdisciplinary Innovations Seoul National University (SNU) Seoul Republic of Korea

Research Institute of Advanced Materials (RIAM) Seoul National University (SNU) Seoul Republic of Korea

Institute for Rechargeable Battery Innovations Research Seoul National University (SNU) Seoul Republic of Korea

Funding

National Research Council of Science and Technology · National Research Foundation

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