journal article·2024-07-02

Enhancing Proton Co-Intercalation in Iron Ion Batteries Cathodes for Increased Capacity

Ze He, Gao Wang, Ruohan Yu, Yalong Jiang, Meng Huang, Fangyu Xiong, Shuangshuang Tan, Michael F. L. De Volder, Qinyou An, Liqiang Mai

ACS Nano· Volume 18· Issue 26
Publisher page

Abstract

Recently, aqueous iron ion batteries (AIIBs) using iron metal anodes have gained traction in the battery community as low-cost and sustainable solutions for green energy storage. However, the development of AIIBs is significantly hindered by the limited capacity of existing cathode materials and the poor intercalation kinetic of Fe 2+ . Herein, we propose a H + and Fe 2+ co-intercalation electrochemistry in AIIBs to boost the capacity and rate capability of cathode materials such as iron hexacyanoferrate (FeHCF) and Na 4 Fe 3 (PO 4 ) 2 (P 2 O 7 ) (NFPP). This is achieved through an electrochemical activation step during which a FeOOH nanowire layer is formed in situ on the cathode. This layer facilitates H + co-intercalation in AIIBs, resulting in a high specific capacity of 151 mAh g –1 and 93% capacity retention over 500 cycles for activated FeHCF cathodes. We found that this activation process can also be applied to other cathode chemistries, such as NFPP, where we found that the cathode capacity is doubled as a result of this process. Overall, the proposed H + /Fe 2+ co-insertion electrochemistry expands the range of applications for AIBBs, in particular as a sustainable solution for storing renewable energy.
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Research context

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

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

Affiliations

Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Institute for Manufacturing, Department of Engineering, University of Cambridge, Cambridge CB3 0FS, U.K.

State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China

Sanya Science and Education Innovation Park of Wuhan University of Technology, Sanya 572000, China

College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China

Hubei Longzhong Laboratory, Xiangyang Demonstration Zone, Wuhan University of Technology, Xiangyang 441000, Hubei, China

Funding

National Key Research and Development Program of China · Natural Science Foundation of Hubei Province · National Natural Science Foundation of China · H2020 European Research Council · Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City · National Energy-Saving and Low-Carbon Materials Production and Application Demonstration Platform Program

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