[Sodium-ion: CAS DICP achieves breakthrough in low-cost Fe-Mn phosphate cathode]

Published: Nov 11, 2026 14:20 (GMT+8)
Researchers at the Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, have made new progress in low-cost iron-manganese composite phosphate cathode materials for sodium-ion batteries. The team revealed how intrinsic oxygen vacancies trigger structural degradation and limit sodium storage performance, and proposed a defect-healing strategy combining orbital tuning and charge compensation. The modified cathode lifts first-cycle Coulombic efficiency from 87.0% to 97.0% and reversible specific capacity to 125.7 mAh/g, close to the theoretical value, with cathode-level specific energy of 421.1 Wh/kg; pouch full cells paired with hard carbon retain 93.6% capacity after 1,000 cycles at 1C. A 100-tonne pilot line has been built and fully commissioned, and the team has set up industrialization partnerships with China Sodium Battery Group and other companies.

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