Breakthrough in Dual-Ion Battery Technology: High-Performing Gel-Polymer Electrolyte Ensures 88.3% Capacity Retention After 6000 Cycles

Strategic Insights -

Researchers at Soochow University in Jiangsu, People's Republic of China, have made a significant advance in dual-ion battery (DIB) technology by developing a gel-polymer electrolyte that mitigates oxidative decomposition of solvent at graphite cathodes and inhibits the generation of corrosive hydrogen fluoride (HF). This innovation has enabled the assembly of high-performance lithium-graphite DIBs that exhibit exceptional cycling stability, with a capacity retention of 88.3% after 6000 cycles at 25°C. The gel-polymer electrolyte, incorporating zeolite molecular sieve into a polyvinylidene fluoride and polyacrylonitrile matrix, has also been shown to improve the stability of the cathode/electrolyte interphase (CEI) layer during long-term cycling.

Key Takeaways:

  • The newly developed gel-polymer electrolyte exhibits excellent physicochemical and electrochemical properties, outperforming traditional liquid electrolytes in terms of CEI layer stability and HF generation inhibition.
  • The gel-polymer electrolyte's ability to resist oxidative decomposition of solvent at graphite cathodes and inhibit HF generation ensures the assembly of high-performance lithium-graphite DIBs with exceptional cycling stability.
  • The DIBs assembled with the gel-polymer electrolyte demonstrate an outstanding capacity retention of 88.3% after 6000 cycles at 25°C, outperforming existing DIBs in terms of cycling stability.
  • The gel-polymer electrolyte's unique properties also enable stable cycling at high temperatures (60°C) and high cutoff voltages (5.0-5.4 V).
  • The research has significant implications for the development of high-performance DIBs, which promise to revolutionize energy storage and electrochemical applications.
  • Qunting Qu, Baozhi Zhang, Weixing Xiong, Jie Shao, Longfei Wang, Ru Wang, and Honghe Zheng are the authors of this research, conducted under the supervision of Soochow University.

Statistics:

  • 88.3% capacity retention after 6000 cycles at 25°C
  • 25°C: stable cycling at high temperatures (60°C) and high cutoff voltages (5.0-5.4 V)
  • 6000 cycles: achievement of exceptional cycling stability with the newly developed gel-polymer electrolyte
  • 88.3%: capacity retention ratio achieved after 6000 cycles at 25°C

Sources:

  • "Trinitarian Stabilization of Electrolyte/Interphase/Cathode for 5.0-5.4 V Dual-Ion Batteries Realized by a Gel-Polymer Electrolyte Capable of HF Elimination." Small Methods, 2025.
  • NewsRx. Soochow University Reports Findings in Nanoscience and Nanotechnology (Trinitarian Stabilization of Electrolyte/Interphase/Cathode for 5.0-5.4 V Dual-Ion Batteries Realized by a Gel-Polymer Electrolyte Capable of HF Elimination). Nanotechnology Weekly. June 23, 2025; p 2904.