A step-channel gel polymer electrolyte for solid-state sodium batteries

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ID: 314972
2026
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Abstract
Abstract Gel polymer electrolytes (GPEs) paired with abundant sodium (Na) and high-voltage polyanion cathode, offer improved energy density and superior safety, positioning them as scalable candidates for resource-limited lithium batteries. However, such technologies are plagued by critical interfacial engineering challenges: existing GPEs fail to sustain (electro)-chemical stability and mechanical close contact at high-loading cathode and high-reactive anode. Here, we report a rationally-engineered GPE featuring biphasic polymer, creating step channels and polymer-solvent dipole adsorption to address the key issues. The volume-constrained bidirectional transport of infilling linear ether and cyclic carbonate solvents and differential polymer mechanical viscoelasticity bearing high-loading cathode and ductile Na anode. Therefore, a high-energy-density full cell of Na||Na3V2(PO4)3 (34.1 mg cmcathode−2, 194.4 Wh kg−1, based on total cell mass) and a stable pouch cell of 4.5 V-class Na||Na2.466Fe1.724Mg0.043(SO4)3 (18.7 mg cmcathode−2, ~100% after 100 cycles) were demonstrated, with safety validation included. The design principles were established for this new chemical engineering pathway towards practical solid-state batteries.
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Authors Xiaoniu Guo, Shuai Guo, Shaohua Ge, Longfei Wen, Zhichao Gong, Yi Yang, Junyu Li, Ruixue Wang, Zhengkun Xie, Jiyu Zhang, Jun Luo, Jianqiang Kang, Lingfei Zhao, J J Lu, Junhua Shao, W G Chen
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Journal national science review
Year 2026
DOI
10.1093/nsr/nwag291
URL
https://doi.org/10.1093/nsr/nwag291
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