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journal article·2025-02Open access

Iron as a Sulfidation‐Resistant Current Collector for Negative Electrode in Sulfide‐Based All‐Solid‐Batteries

Hyejun Kim, Hyojoo Lee, Gyeong Hyeon Kwon, Jiyun Kim, Daeboem Jeong, Hun‐Gi Jung, Jong‐Seong Bae, Daiha Shin, Jiung Cho, Jung Ho Kim, Hyun‐seung Kim, Junyoung Mun, Ohmin Kwon

Small· Volume 21· Issue 5
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Abstract

Abstract The demand for all‐solid‐state batteries (ASSBs) featuring credible Li6PS5Cl argyrodite (LPSCl) electrolytes is increasing, driving interest in exploring suitable current collectors for ASSBs. Copper (Cu), used as a current collector in traditional lithium‐ion batteries, exhibits significant instability in LPSCl‐ASSBs. In this study, the effectiveness of iron (Fe) is systematically investigated as an alternative current collector in LPSCl‐ASSBs and compare its performance to that of Cu. Electrochemical analyses reveal that Cu undergoes unfavorable side reactions with LPSCl, forming copper sulfides and leading to pitting corrosion. In contrast, Fe, with its thick native oxide layer, effectively mitigates sulfide sub‐reactions, enhancing the stability of the current collector‐LPSCl electrolyte interface. Density function theory calculations and thermal tools using XRD and linear thermammetry confirm the higher stability of Fe with LPSCl compared to Cu. Replacing the Cu current collector with Fe significantly improves the long‐term stability of graphite‐based negative electrodes in ASSBs, achieving exceptional long cycleability exceeding 1000 cycles. These findings identify Fe as a promising current collector for ASSBs and provide valuable insights into the metal‐electrolyte interactions that govern the performance of these advanced battery systems.
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Research context

Energy storageMetals & alloys

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced battery technologies research

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

Affiliations

School of Advanced Materials Science and Engineering Sungkyunkwan University Seobu‐ro, Jangan‐gu Suwon‐si Gyeonggi‐do 2066 Republic of Korea

Energy Storage Research Center Korea Institute of Science and Technology Seoul 02792 Republic of Korea

KIST‐SKKU Carbon‐Neutral Research Center Sungkyunkwan University Suwon 16419 Republic of Korea

Busan Center Korea Basic Science Institute (KBSI) 30, Gwahaksandan 1‐ro 60beon‐gil, Gangseo‐gu Busan 46742 Republic of Korea

Metropolitan Seoul Center Korea Basic Science Institute (KBSI) Seoul 03759 Republic of Korea

Department of Materials Science and Engineering Hongik University 2639 Sejong‐ro Sejong Republic of Korea

Institute for Superconducting and Electronic Materials Faculty of Engineering and Information Sciences University of Wollongong, Squires Way North Wollongong NSW 2500 Australia

Advanced Batteries Research Center Korea Electronics Technology Institute 25 Saenari‐ro Seongnam 13509 Republic of Korea

SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University 2066, Seobu‐ro, Jangan‐gu Suwon‐si Gyeonggi‐do 16419 Republic of Korea

LiB Materials Research Group Research Institute of Industrial Technology and Science (RIST) POSCO Global R and D Center Sondohwahak‐ro 100, Yeonsu‐gu Incheon 21985 Republic of Korea

Funding

Institute of Civil-Military Technology Cooperation

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