Ultramicropore-Confined Solvation and Interphase Regulation Unlock High-Performance Hard Carbon Anodes for Sodium-Ion Batteries (IMAGE)
Caption
- An iodine-mediated oxidative cross-linking strategy enables the synthesis of spherical hard carbon with uniformly distributed ultramicropores (< 0.9 nm) and carbonyl-rich surfaces from starch precursors.
- Ultramicropore-confined solvation favors anion-enriched electrolyte structures, while carbonyl groups promote NaF-rich inorganic interphases, enabling synergistic interfacial regulation.
- The optimized hard carbon delivers high initial Coulombic efficiency (88.4%), large plateau contribution (64.1%), excellent rate capability (288.9 mAh g−1 at 5C), and stable cycling (95.6% retention after 200 cycles)
Credit
Shunyuan Tan, Zhiyuan Cheng, Jiahao Xing, Jingkai Gao, Zimo Huang, Hongshuai Hou, Zhongliang Tian, Yanqing Lai, Jie Li, Simin Li*, Xiaobo Ji*.
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CC BY-NC-ND