Citation: Hao Liu, Qiang Xu, Yun Zhang, Na Han, Haihui Liu, Xingxiang Zhang. Multifunctional heterostructure CoS₂/FeS₂ catalysts for enhancing high-performance lithium–sulfurized polyacrylonitrile batteries through intrinsic electric fields[J]. Chinese Chemical Letters, ;2026, 37(8): 111084. doi: 10.1016/j.cclet.2025.111084 shu

Multifunctional heterostructure CoS₂/FeS₂ catalysts for enhancing high-performance lithium–sulfurized polyacrylonitrile batteries through intrinsic electric fields

Hao Liu ^{a, b, c, d} ,
Qiang Xu ^{a, b, c, d} ,
Yun Zhang ^{a, b, c, d} ,
Na Han ^{a, b, c, d} ,
Haihui Liu ^{a, b, c, d, *,} ,
Xingxiang Zhang ^{a, b, c, d, *,}

a.
School of Material Science and Engineering, Tiangong University, Tianjin 300387, China
b.
State Key Laboratory of Advanced Separation Membrane Materials, Tianjin 300387, China
c.
Municipal Key Laboratory of Advanced Fiber and Energy Storage, Tianjin 300387, China
d.
Industrial Technology Research Institute of Membranes, Cangzhou Institute of Tiangong University, Cangzhou 061000, China

liuhaihui@tiangong.edu.cn

zhangpolyu@aliyun.com

Received Date: 13 January 2025
Revised Date: 7 March 2025
Accepted Date: 12 March 2025
Available Online: 13 March 2025

Figures(6)

Lithium-sulfurized polyacrylonitrile (Li-SPAN) batteries have attracted attention as a unique subset of lithium-sulfur batteries owing to their effectiveness in mitigating the shuttle effect caused by the dissolution of polysulfides. However, traditional SPAN electrodes typically exhibit an active material loading capacity of < 40 wt% and demonstrate suboptimal reaction kinetics, which limits their actual performance. In this study, a composite film (CoS₂/FeS₂@SeSPAN/CNTs) was developed, which is poised to serve as the cathode in commercial Li-SPAN batteries. The film was fabricated by forming a PAN framework through casting, subsequently growing Fe-ZIF-67 on it via hydrothermal processing, and converting it into CoS₂/FeS₂ heterostructure and SeSPAN through heat treatment. The porous structure of this material provided numerous sites for active material storage. This effect led to an active material loading capacity of 61 wt%. Experimental results and density functional theory simulations indicated that, owing to the shielding effect of the cathode solid electrolyte interface, the additionally stored active material exhibited an extended all-solid-state reaction mechanism. Furthermore, the internal electric field generated by the CoS₂/FeS₂ heterostructure effectively enhanced the adsorption and catalytic conversion of solid polysulfides, thereby improving lithium-ion migration efficiency. As a result, the active material stored in dual-mode exhibited high utilization rates. At a current density of 1 C, the capacity retention of the CoS₂/FeS₂@SeSPAN/CNTs cathode was 97.9% after 800 cycles. This result demonstrated that the design and development of the CoS₂/FeS₂@SeSPAN/CNTs composite film significantly enhanced the electrochemical performance of Li-SPAN batteries while paving the way for the commercial exploration of other heterostructural materials in energy storage systems.
- Lithium-sulfurized polyacrylonitrile batteries,
- High active material content,
- Cathode electrolyte interphase,
- Heterostructure,
- Intrinsic electric fields
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沈阳化工大学材料科学与工程学院沈阳 110142

Multifunctional heterostructure CoS2/FeS2 catalysts for enhancing high-performance lithium–sulfurized polyacrylonitrile batteries through intrinsic electric fields

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通讯作者: 陈斌, bchen63@163.com

Multifunctional heterostructure CoS₂/FeS₂ catalysts for enhancing high-performance lithium–sulfurized polyacrylonitrile batteries through intrinsic electric fields