Self-limited and reversible surface hydration of Na2Fe(SO4)2 cathodes for long-cycle-life Na-ion batteries

被引：3
作者：
Zheng, Zhilin [1 ]
Li, Xiaoqiao [1 ]
Wang, Yong [1 ]
Zhang, Yunlong [1 ,2 ]
Jiang, Yufeng [3 ]
He, Yu-Shi [1 ]
Niu, Chao [5 ]
Che, Haiying [2 ]
Li, Linsen [1 ,6 ]
Ma, Zi-Feng [1 ,2 ,4 ]
机构：
[1] Shanghai Jiao Tong Univ, Shanghai Electrochem Energy Device Res Ctr SEED, Dept Chem Engn, Shanghai 200240, Peoples R China
[2] Zhejiang NaTRIUM Energy Co Ltd, Shaoxing 312000, Zhejiang, Peoples R China
[3] BYD Lithium Battery Co Ltd, Shenzhen 518000, Peoples R China
[4] Shanghai Jiao Tong Univ, Shaoxing Res Inst Renewable Energy & Mol Engn, Shaoxing 312300, Peoples R China
[5] Shandong Yonghao New Mat Technol Co Ltd, Zibo 255400, Shandong, Peoples R China
[6] Shanghai Jiao Tong Univ, Sichuan Res Inst, Chengdu 200240, Sichuan, Peoples R China
来源：
ENERGY STORAGE MATERIALS | 2025年 / 74卷
关键词：
Na-ion batteries; Sodium iron sulfate; Air sensitivity; Reversible hydration; Pouch cells; CATHODE MATERIALS; LOW-COST; GRAPHENE; PROGRESS;
D O I：
10.1016/j.ensm.2024.103882
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Air stability is a crucial factor in the practical application of a battery material, as it profoundly affects the material's preparation, storage, and electrode fabrication processes. Sodium iron sulfate cathodes, despite their attractive attributes in cost and electrochemical performance, are widely believed to be unstable upon air exposure because of the sulfate group. Here we report remarkable air-stability of the Na2Fe(SO4)(2)-based (NFS) cathodes (minimal decay in 20 % RH air for 60 days, 91.9 % capacity retention after 3500 cycles in half cells) and their outstanding cycle performance in practically relevant pouch-type full cells (similar to 100 Wh kg(-1) specific energy, >1000 cycle-life). Although the NFS cathodes do react with moisture H2O to produce Na2Fe(SO4)(2)& sdot;4H(2)O but the hydration is spatially confined at the NFS particles' surface and not propagating into their bulk. Further, the structural changes are reversible when the surface-hydrated NFS particles are heated in the typical electrode vacuum-drying process, avoiding extra treatment and additional cost. This work reveals the promising properties of the NFS cathode materials towards high-performance and sustainable Na-ion batteries.
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页数：10
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