Volume 17, Issue 40 2103819
Research Article

Grain Boundary Design of Solid Electrolyte Actualizing Stable All-Solid-State Sodium Batteries

Chengzhi Wang

Chengzhi Wang

Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Zheng Sun

Zheng Sun

Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Yongjie Zhao

Corresponding Author

Yongjie Zhao

Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China

E-mail: [email protected], [email protected], [email protected]

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Boyu Wang

Boyu Wang

Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Changxiang Shao

Changxiang Shao

Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Chen Sun

Chen Sun

Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Yang Zhao

Corresponding Author

Yang Zhao

Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081 China

E-mail: [email protected], [email protected], [email protected]

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Jingbo Li

Jingbo Li

Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Haibo Jin

Haibo Jin

Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Liangti Qu

Corresponding Author

Liangti Qu

Department of Chemistry, Tsinghua University, Beijing, 100084 China

E-mail: [email protected], [email protected], [email protected]

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First published: 01 September 2021
Citations: 23

Abstract

Advanced inorganic solid electrolytes (SEs) are critical for all-solid-state alkaline metal batteries with high safety and high energy densities. A new interphase design to address the urgent interfacial stability issues against all-solid-state sodium metal batteries (ASSMBs) is proposed. The grain boundary phase of a Mg2+-doped Na3Zr2Si2PO12 conductor (denoted as NZSP-xMg) is manipulated to introduce a favorable Na3−2δMgδPO4-dominant interphase which facilitates its intimate contact with Na metal and works as an electron barrier to suppress Na metal dendrite penetration into the electrolyte bulk. The optimal NZSP-0.2Mg electrolyte endows a low interfacial resistance of 93 Ω cm2 at room temperature, over 16 times smaller than that of Na3Zr2Si2PO12. The Na plating/stripping with small polarization is retained under 0.3 mA cm-2 for more than 290 days (7000 h), representing a record high cycling stability of SEs for ASSMBs. An all-solid-state NaCrO2//Na battery is accordingly assembled manifesting a high capacity of 110 mA h g-1 at 1 C for 1755 cycles with almost no capacity decay. Excellent rate capability at 5 C is realized with a high Coulombic efficiency of 99.8%, signifying promising application in solid-state electrochemical energy storage systems.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Research Data are not shared.

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