Lithium-sulfur (Li-S) batteries offer high theoretical energy density and low cost,making them promising candidates for energy storage applications.However,the poor conductivity and low melting point of sulfur as cathode material hinder their development to a great extent.Nano sulfur was mixed with carbon nanofibers with good conductivity,and then the sulfur-carbon hybrid materials (S/C) were placed in two atmospheres of gas (air) and liquid (cyclohexane) and applied with pressure to obtain two types of bulk materials (recorded as air-S/C and cyclohexane-S/C).Finally,the sulfur-carbon composites were obtained by heating at 220℃ for 8h (recorded as air-S@C and cyclohexane-S@C).The thermal stability,micro morphology and electrochemical properties of the materials were analyzed and tested by thermogravimetric analyzer,field emission scanning electron microscope and electrochemical workstation.The results showed that the pressurization effect was directly affected by the atmosphere conditions during the pressing process,and the pressurization effect of liquid atmosphere of cyclohexane was better than that of air atmosphere.cyclohexane-S/C had higher strength and lower sulfur loss during high-temperature sintering,which was conducive to improving the utilization rate of active sulfur material.The Li-S batteries using cyclohexane-S@C as the cathode material not only provided an initial capacity of up to 1358mAh/g at 0.1C rate,but also maintained a specific capacity of 815mAh/g after 100 cycles at 0.2C rate.
You Yingying, Ni Junze, Cai Yingying, Xiong Qianhui, Chen Xinyu, Zhang Hanping
. Preparation and properties of cathode materials for lithium-sulfur batteries[J]. New Chemical Materials, 2025
, 53(3)
: 137
-140
.
DOI: 10.19817/j.cnki.issn1006-3536.2025.03.001
[1] Chen S R,Zhai Y P,Xu G L,et al.Ordered mesoporous carbon/sulfur nanocomposite of high performances as cathode for lithium-sulfur battery[J].Electrochimica Acta,2011,56(26):9549-9555.
[2] Diao Y,Xie K,Xiong S,et al.Analysis of polysulfide dissolved in electrolyte in discharge-charge process of Li-S battery[J].Journal of the Electrochemical Society,2012,159(4):421-425.
[3] Xu S,Zhang Z,Li J,et al.Nanoporous carbon microspheres as matrix of sulfur to prepare sulfur/carbon cathode material for lithium-sulfur battery[J].Ionics,2018,24(9):2509-2521.
[4] Yeon S H,Jung K N,Yoon S,et al.Improved electrochemical performances of sulfur-microporous carbon composite electrode for Li/S battery[J].Journal of Applied Electrochemistry,2013,43(3):245-252.
[5] Wu Y,Gao M,Li X,et al.Preparation of mesohollow and microporous carbon nanofiber and its application in cathode material for lithium-sulfur batteries[J].Journal of Alloys and Compounds,2014,608:220-228.
[6] Yin L,Wang J,Lin F,et al.Polyacrylonitrile/graphene composite as a precursor to a sulfur-based cathode material for high-rate rechargeable Li-S batteries[J].Energy & Environmental Science,2012,5(5):6966-6972.
[7] Ji X,Lee K T,Nazar L F.A highly ordered nanostructured carbon-sulphur cathode for lithium-sulphur batteries[J].Nature Materials,2009,8(6):500-506.
[8] Liang C,Dudney N J,Howe J Y.Hierarchically structured sulfur/carbon nanocomposite material for high-energy lithium battery[J].Chemistry of Materials,2009,21(19):4724-4730.
[9] Li S H,Xia X H,Wang Y D,et al.Reconstruction of multidimensional carbon hosts with combined 0D,1D and 2D networks for enhanced lithium-sulfur batteries[J].Journal of Power Sources,2017,342:224-230.
[10] Yu Z,Huang X,Zheng M,et al.Self-assembled macrocyclic copper complex enables homogeneous catalysis for high-loading lithium-sulfur batteries[J].Advanced Materials,2023,35(26):2300861.
[11] Yuan C,Song X,Zeng P,et al.Precisely optimizing polysulfides adsorption and conversion by local coordination engineering for high-performance Li-S batteries[J].Nano Energy,2023,110:108353.
[12] Hu X,Silva S R P,Zhang P,et al.A multifunctional fire-retardant gel electrolyte to enable Li-S batteries with higher Li-ion conductivity and effectively inhibited shuttling of polysulfides[J].Chemical Engineering Journal,2023,467:143378.
[13] Kang H S,Sun Y K.Freestanding bilayer carbon-sulfur cathode with function of entrapping polysulfide for high perfor-mance Li-S batteries[J].Advanced Functional Materials,2016,26(8):1225-1232.
[14] Ahn S,Mikuriya H,Kojima E,et al.Synthesis of Li conductive polymer layer on 3D structured S cathode by photo-polymerization for Li-S batteries[J].Journal of the Electrochemical Society,2022,169(3):30546.
[15] Kwack H,Lee J,Jo W,et al.Rational design of highly packed,crack-free sulfur electrodes by scaffold-supported drying for ultrahigh-sulfur-loaded lithium-sulfur batteries[J].ACS Applied Materials & Interfaces,2019,11(33):29849-29857.
