Sodium–gallium alloy layer for fast and reversible sodium deposition
Xiang Lv,
Fang Tang,
Yu Yao,
Chen Xu,
Dong Chen,
Lin Liu,
Yuezhan Feng,
Xianhong Rui,
Yan Yu
Affiliations
Xiang Lv
Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter School of Materials and Energy Guangdong University of Technology Guangzhou China
Fang Tang
Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter School of Materials and Energy Guangdong University of Technology Guangzhou China
Yu Yao
Hefei National Research Center for Physical Sciences at the Microscale Department of Materials Science and Engineering National Synchrotron Radiation Laboratory CAS Key Laboratory of Materials for Energy Conversion University of Science and Technology of China Hefei Anhui China
Chen Xu
Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen China
Dong Chen
Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter School of Materials and Energy Guangdong University of Technology Guangzhou China
Lin Liu
Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter School of Materials and Energy Guangdong University of Technology Guangzhou China
Yuezhan Feng
Key Laboratory of Materials Processing and Mold (Ministry of Education) Zhengzhou University Zhengzhou China
Xianhong Rui
Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter School of Materials and Energy Guangdong University of Technology Guangzhou China
Yan Yu
Hefei National Research Center for Physical Sciences at the Microscale Department of Materials Science and Engineering National Synchrotron Radiation Laboratory CAS Key Laboratory of Materials for Energy Conversion University of Science and Technology of China Hefei Anhui China
Abstract Sodium metal has been regarded as the potential alternative for metal batteries owing to its advantages of high theoretical capacity and abundant reserves. Nevertheless, propagation of Na dendrites can boost the interfacial instability of Na metal, retarding its practical implementation. Thus, the Na–Ga alloy layer is designed and fabricated by in situ rolling of metal Ga on the surface of Na metal. This alloy layer possesses good sodiophilicity, which can effectively protect Na metal and favor the uniform Na+ deposition, obtaining the inhibition of Na dendrites growth. Consequently, the symmetric cells assembled by the alloy‐layer protected Na metal electrodes (NGAL‐Na||NGAL‐Na) have a long lifetime (468 h) even under a high plating/stripping capacity of 6 mAh cm−2 in carbonate electrolyte. The full battery of NGAL‐Na||Na3V2(PO4)3 is able to sustain an excellent rate capability of 100 mAh g−1 after 500 cycles at 10 C under ambient temperature. This work provides a new route to prevent metal anodes from severe dendrite growth, and paves the way toward safer and stable‐performing metal‐based rechargeable batteries.
