ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Na Yang,Jiyuan Zhang,Yuanxiao Ji,Weiye Zhang,Jiarui Xue,Xuexia He,Qi Li,Zhibin Lei,Zonghuai Liu,Jie Sun
Lithium–sulfur batteries are particularly prominent among many energy storage devices due to their excellent theoretical specific capacity (1675 mAh g–1) and energy density (2600 kW h–1), low cost, and environmental friendliness. However, such outstanding devices suffer from the low conductivity of elemental sulfur and discharge product, the drastic volume changes during charge and discharge processes, and the shuttle effect caused by soluble lithium polysulfides (LiPSs) dissolved in the electrolyte. In this work, we design and synthesize a poly(3,4-ethylenedioxythiophene) (PEDOT) decorated FeS2@C hollow nanospheres to act as the sulfur host to alleviate the above issues. The excellent catalytic properties of FeS2 together with the superior electrical conductivity and chemical adsorption capacity of the PEDOT coating are combined together to hinder the shuttle effect at the same time. Through the phase structure and morphology characterization, the optimized parameters of PEDOT coating have been confirmed to be 100 μL EDOT monomer addition and polymerization for 10 min. Based on the Li2S6 adsorption, cyclic voltammetry (CV) test of the symmetric cells, and Li2S nucleation experiment, the PEDOT@FeS2@C-4 wt % cathode was proved to exhibit the highest catalytic activity on LiPSs. Through the CV curves with different scan rates and the charge–discharge curves collected with the help of the galvanostatic intermittent titration technique (GITT), it is proved that appropriate PEDOT coating thickness is the key to improve the adsorption/catalytic ability on LiPSs. As a result, the PEDOT@FeS2@C/S-4 wt % cathode can exhibit the highest initial capacity of 1435 mAh g–1 at 0.1 C and remain at 893 mAh g–1 after 100 cycles. Moreover, the capacity decay rate of the PEDOT@FeS2@C/S-4 wt % cathode was confirmed to be 0.07% per cycle after 500 cycles at 1 C, also demonstrating an excellent cyclic stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 7
·期 2
·394-401
·
IF 5.934
Yushan Luo,Mengli Tao,Jianhua Deng,Renming Zhan,Bingshu Guo,Qianru Ma,Muhammad Kashif Aslam,Yuruo Qi,Maowen Xu
K-ion batteries (KIBs) are considered as one of the most promising devices for large-scale energy storage because of the comparable output voltage with lithium-ion batteries and the abundant reserves of potassium. FeS2 is regarded as a kind of very important anode material for KIBs due to its low cost and high capacity. However, the poor electronic conductivity and huge volume expansion of FeS2 during the discharge/charge process strongly inhibit the K-storage performance. To solve these problems, herein, unique core–shell FeS2@C nanocubes with nanoparticles in the interior and carbon shells in the exterior are designed. The inside FeS2 nanoparticles are beneficial for K+ diffusion and the penetration of the electrolyte, while the outside carbon shells can enhance the electronic conductivity and suppress the volume expansion. The unique core–shell structure displays outstanding K-storage performance with impressive specific capacity, excellent cycling stability, and superior rate capability with 73% capacity retention at 2 A g−1. This work not only provides solutions to obtain a superior anode material for KIBs but also offers insights into designing a hierarchical structure for energy storage systems.
研究领域:
材料科学
·
能源化学
·
纳米技术
·
电化学储能
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Menghang Sun,Xinyu Zhou,Lili Li,Bo Wen,Yunzi Miao,Xiaofeng Liu,Wei Yan,Guorui Yang,Shujiang Ding
Recycling spent cathode materials is crucial for sustainably developing lithium-ion battery technology. To achieve the high-value utilization of spent LiFePO 4 (LFP) cathodes, this paper proposes a method for preparing MIL-100(Fe) based on solid waste residues from spent LFP cathodes. R-FeS 2 @C derived from MIL-100(Fe) can serve as an anode material for potassium-ion batteries featuring a porous structure. Electrochemical tests demonstrate that the R-FeS 2 @C exhibits more stable cycling performance compared with the FeS 2 @C derived from the traditional MIL-100(Fe), reaching 525 mAh g −1 after 100 cycles at a current density of 100 mA g −1 . Impressively, R-FeS 2 @C also showcases excellent rate performance (343 mAh g −1 specific capacity at 5 A g −1 ). Furthermore, full cells assembled with PI@rGO cathodes also exhibit excellent rate performance and stable cycling performance. The porous structure of R-FeS 2 @C provides numerous voids to accommodate volume changes and introduces sufficient channels for electrolyte penetration. The higher carbon content enhances the electrical conductivity improving the kinetics of the K + migration reaction. These researches can provide guidance for the recycling of spent lithium-ion batteries and the design of sulfide electrodes for PIBs.
研究领域:
材料科学
·
能源存储技术
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fei Wang,Wenlong Zhang,Haihui Zhou,Hong Chen,Zhongyuan Huang,Zhanheng Yan,Rujia Jiang,Chuqing Wang,Zhong Tan,Yafei Kuang
Pyrite (FeS 2 ) is considered to be one of the most promising anode materials for sodium ion batteries (SIBs) due to its high theoretical capacity, natural abundance, low cost and low toxicity, but the commercial process of FeS 2 is always limited by its low conductivity and volume expansion during the charge-discharge process. Herein, a three-dimensional porous composite (FeS 2 -C/RG) is constructed using FeS 2 -C nanoparticles and reduced graphene oxide through one-step vulcanization of PB (Prussian blue)/GO (graphene oxide) gel. As the anode material of SIBs, FeS 2 -C/RG exhibits high electrochemical performance benefiting from the unique three dimensional structure and small FeS 2 -C nanoparticles. The initial specific capacity can reach 1196 mAh g −1 at 0.1 A g −1 and it can still remain 543.0 mAh g −1 after 100 cycles at 0.5 A g −1 . Even at 6 A g −1 , the capacity could maintain 291.7 mAh g −1 after 1000 cycles. The excellent rate and cycling performance of FeS 2 -C/RG indicate it is a promising anode material for rechargeable SIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 20
·3364
·
IF 2.972
Kefeng Pan,Yingying Zhai,Jiawei Zhang,Kai Yu
Electrolytic water splitting with evolution of both hydrogen (HER) and oxygen (OER) is an attractive way to produce clean energy hydrogen. It is critical to explore effective, but low-cost electrocatalysts for the evolution of oxygen (OER) owing to its sluggish kinetics for practical applications. Fe-based catalysts have advantages over Ni- and Co-based materials because of low costs, abundance of raw materials, and environmental issues. However, their inefficiency as OER catalysts has caused them to receive little attention. Herein, the FeS2/C catalyst with porous nanostructure was synthesized with rational design via thein situelectrochemical activation method, which serves as a good catalytic reaction in the OER process. The FeS2/C catalyst delivers overpotential values of only 291 mV and 338 mV current densities of 10 mA/cm2and 50 mA/cm2, respectively, after electrochemical activation, and exhibits staying power for 15 h.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）