journal article·2025-01-10

Regulating Solvation Shell to Fortify Anion–Cation Coordination for Enhanced Sodium Metal Battery Stability

Zhangbin Cheng, Zehui Zhang, Feilong Qiu, Zheng Gao, Haijiao Xie, Zhen Xu, Min Jia, Xiaoyu Zhang, Haoshen Zhou

ACS Energy Letters· Volume 10· Issue 1
Publisher page

Abstract

The use of sodium metal as an anode presents a promising avenue for high energy density sodium rechargeable batteries given its high specific capacity and low redox potential. However, sodium metal batteries (SMBs) encounter significant challenges, including interfacial parasitic reactions and dendrite growth. Developing a robust solid electrolyte interphase (SEI) is crucial for SMB engineering. This study introduces hydrofluoroether as a diluent in high-concentration electrolytes, effectively modifying the solvation structure to enhance ion-pair coordination, which leads to an inorganic-rich SEI, mitigating sodium depletion and dendrite formation. Consequently, localized high concentration electrolytes achieve a 98.3% Coulombic efficiency in Na||Cu batteries, while the Na||NaFe 1/3 Ni 1/3 Mn 1/3 O 2 battery retains 86.4% capacity after 750 cycles at 1C. Additionally, the Na||Na 3 V 2 (PO 4 ) 3 battery achieves an exceptional average Coulombic efficiency of 99.97% at 1C, with a capacity retention of 95.4% after 517 days. This study provides a framework for enhancing efficiency and longevity in SMBs that can be applied to other battery systems.
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Research context

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Extraction and Separation Processes

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Affiliations

School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, P. R. China

Center of Energy Storage Materials & Technology, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Micro-structures, and Collaborative Innovation Center of Advanced Micro-structures, Nanjing University,Nanjing 210093, P. R. China

School of Integrated Circuits, East China Normal University, Shanghai 200241, P. R. China

Hangzhou Yanqu Information Technology Co., Ltd, Y2, second Floor, Building 2, Xixi Legu Creative Pioneering Park, No. 712 Wen’er West Road, Xihu District, Hangzhou City, Zhejiang Province 310003, P. R. China

School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353 P. R. China

Funding

National Natural Science Foundation of China · Jiangsu Province Carbon Peak and Neutrality Innovation Program

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