Authors
Jiawen Huang, Xiaoyang Zheng, Xingguo An, Zhenzhen Wang, Jinlong Jiang, Han Lin, Xin Hui, Kuan Wu, Weiran Zhang, Hua-Kun Liu, Shi-Xue Dou, Chao Wu
Published in
Advanced materials (Deerfield Beach, Fla.). Pages e75231. Oct 05, 2026. Epub Oct 05, 2026.
Abstract
Anode-free sodium metal batteries, without excess metallic anode, promise high energy density and cost-effectiveness. However, their practicality is impaired by limited cycling life and poor Na plating/stripping reversibility, especially under lean-electrolyte and high-rate conditions. Challenging the prevailing strategy of constructing dense sodiophilic layer, we design a discontinuous array of spatially dispersed sodiophilic sites upon depositing substrate via ultrasonic spray coating to regulate metal nucleation and planar growth. A nano-layer of alloy-conversion-type Bi0.4Sb1.6Te3 on Al foil enables ultralight and scalable current collector with minimal loading <0.092 mg cm-2 and low areal density ≈104 cm-2, yet still ensures lateral coalescence of uniform Na nuclei into compact deposits among the discrete Na-affinitive alloying domains and mitigate volume expansion and coating pulverization during sodiation. Importantly, the random matrix of spray-coated nanoparticles creates a rough and discontinuous interfacial architecture for improved electrolyte wetting and fast lean-electrolyte infiltration. As a result, high-loading NVP||BST@Al anode-free full cells prove 5C-fast charging over 400 cycles and a 2.75-Ah NFPP||BST@Al anode-free pouch cell demonstrates stable operation exceeding 110 cycles with lean electrolyte of 1.7 g Ah-1, yielding a high energy density of 205 Wh kg-1 and high-power density of 226 W kg-1 based on total pouch-cell weight.
PMID:
42834567
Bibliographic data and abstract were imported from PubMed on 06 Oct 2026.
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