Construction of CoS2 Reduction Accelerator-Modified Sulfurized Polyacrylonitrile Nanofibers as High-Performance Cathode Materials for Practical Lithium–Sulfur Batteries,ACS Applied Energy Materials

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Construction of CoS2 Reduction Accelerator-Modified Sulfurized Polyacrylonitrile Nanofibers as High-Performance Cathode Materials for Practical Lithium–Sulfur Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-08-13 , DOI: 10.1021/acsaem.3c01284
Yongbing Li _{1,

2,

3} , Runhe He _{1,

2,

3} , Hao Liu _{1,

2,

3} , Yun Zhang _{1,

2,

3} , Haihui Liu _{1,

2,

3} , Na Han _{1,

2,

3} , Xingxiang Zhang _{1,

2,

3}

Affiliation

Sulfurized polyacrylonitrile (SPAN) is an attractive cathode material for lithium–sulfur batteries because of its high theoretical energy density, good cyclic stability, and low self-discharging rate. However, the slow reaction kinetics enormously limits the actual capacity and rate performance of SPAN cathodes. In the present work, SPAN nanofibers containing a certain amount of CoS₂ were used to prepare high-performance cathode materials for lithium–sulfur batteries, and the redox kinetics of sulfur conversion was promoted by imparting catalytic activities to SPAN. Specifically, Co was uniformly distributed in CoS₂-SPAN nanofibers in the form of CoS₂, which reduced the charge transfer impedance in the electrode, accelerated the conversion of short-chain polysulfide to Li₂S/Li₂S₂, increased the migration rate of lithium ions, and improved the kinetics of the redox reaction. Hence, after the sulfurization of polyacrylonitrile nanofibers containing 4 wt % of CoCO₃, CoS₂-SFPAN manifested a high reversible capacity of 762 mAh g^–1_composite at 0.2 C, an excellent multiplicative performance of 592 mAh g^–1_composite at 4.0 C, and an extremely stable cycle life of more than 500 cycles at 1.0 C. When the cathode was tested under a high areal loading (S) of 5.5 mg cm^–2 and a lean electrolyte (E) condition of E/S = 10 μL mg^–1, it maintained high reversible capacities of 710 mAh g^–1_composite at 0.1 C and 652 mAh g^–1_composite at 0.2 C.

中文翻译：

CoS2还原促进剂改性硫化聚丙烯腈纳米纤维作为实用锂硫电池高性能正极材料的构建

硫化聚丙烯腈（SPAN）因其高理论能量密度、良好的循环稳定性和低自放电率而成为锂硫电池的一种有吸引力的正极材料。然而，缓慢的反应动力学极大地限制了SPAN正极的实际容量和倍率性能。在本工作中，含有一定量CoS ₂的SPAN纳米纤维被用来制备高性能锂硫电池正极材料，并通过赋予SPAN催化活性来促进硫转化的氧化还原动力学。_{具体来说，Co以CoS 2}的形式均匀分布在CoS _{2 -SPAN纳米纤维中。}_{，降低了电极中的电荷转移阻抗，加速了短链多硫化物向Li 2} S/Li ₂ S ₂的转化，提高了锂离子的迁移速率，改善了氧化还原反应的动力学。因此，含4 wt% CoCO ₃的聚丙烯腈纳米纤维硫化后，CoS _{2 -SFPAN表现出0.2 C下762 mAh g}^–1_复合材料的高可逆容量， 4.0 C下592 mAh g ^–1_复合材料的优异倍增性能，并且在 1.0 C 下具有超过 500 次循环的极其稳定的循环寿命。当阴极在 5.5 mg cm ^{–2的高面积负载 (S) 下进行测试时}^{在E/S = 10 μL mg –1}的贫电解质（E）条件下，它在0.1 C下保持了710 mAh g ^–1_复合材料的高可逆容量，在0.2 C下保持了652 mAh g ^–1_{复合材料的高可逆容量。}

更新日期：2023-08-13

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