Liquid Bi-Sb-Sn Electrodes with Synergistic Stabilization Mechanism for Long-Lifespan Sodium-Based Liquid Metal Batteries

被引：0

作者：

Zhou, Hao ^{[1
,2
]}

Li, Haomiao ^{[1
]}

Feng, Shaoming ^{[2
]}

Yan, Shuai ^{[2
]}

Zhou, Xianbo ^{[1
]}

Zhang, Weixin ^{[2
]}

Guo, Yewei ^{[2
]}

Jiang, Kai ^{[1
]}

Wang, Kangli ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Elect & Elect Engn, State Key Lab Adv Electromagnet Technol, Wuhan 430074, Hubei, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2024年 / 16卷 / 43期

基金：

中国国家自然科学基金;

关键词：

liquid metal battery; sodium; alloy cathode; synergistic stabilization mechanism; long lifespan; POSITIVE CURRENT COLLECTOR; ENERGY-STORAGE; ANODES;

D O I：

10.1021/acsami.4c12881

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Sodium-based liquid metal batteries are well suited for stationary energy storage due to their long life, intrinsic safety, and ease of scale-up. However, the irreversible alloying reaction between the positive current collector (PCC) and the cathodes at high temperatures leads to severe capacity degradation of the battery, severely limiting its scale-up application. In this work, a Bi-Sb-Sn alloy cathode based on a synergistic stabilization mechanism was designed for the first time. Due to the density difference of Bi, Sb, and Sn and the compatibility difference of Bi and Sn with the PCC, a part of Bi and Sn is spontaneously distributed in the region close to the PCC. The protection of Sb is realized by blocking the contact of Sb with the PCC as well as removing the PCC material dissolved in the cathode to prevent the loss of active material. Based on such protection, the Na||Bi36Sb24Sn40 cell maintained 99% Coulombic efficiency for 450 cycles at a rate of 0.75 C, with a capacity retention of 99.56% and a capacity decay rate of 0.001% per cycle. In addition, the interaction of Bi, Sb, and Sn during discharge also promotes capacity release and energy efficiency. At 0.3 C, the Na||Bi36Sb24Sn40 cell achieved 89% capacity utilization and 82% energy efficiency. These results provide an idea for the design of other batteries based on liquid metal electrodes.

引用

页码：58668 / 58676

页数：9