The 3D-bimetal-organic frameworks precursors were obtained by precipitation reaction in aqueous solution using Co(NO3)2 and K3Fe(CN)6.And the series of carbonizing products were obtained by additional polydopamine envelope and annealing at different temperature,which used as the cathode material of lithium-sulfur (Li-S) battery.The morphology and structure of the different samples were compared by X-ray diffractometer (XRD),scanning electron microscope (SEM),transmission electron microscope (TEM),thermal gravimetric analyzer (TG),etc.And the difference in carbonization process of different samples were analysis.The Electrochemical performance of Li-S batteries with different samples as cathode materials were tested by electrochemical impedance test (EIS),cyclic voltampere test (CV),and charge and discharge performance test.The results shown that the polydopamine envelope and annealing temperature can affect the carbonization product structure.The polydopamine coating can prevent material reunion during carbonization.And the spatial domain restriction of the intact shell was helpful to anchor S and polysulfide inside the structure.Excessive annealing temperature can disrupt the integrity of the nuclear shell structure,and too low annealing temperatures can cause incomplete carbonization of the material.As the best one,the Li-S batteries with CoFeCN@C-750 cathode performed excellent cycling stability with the capacity decay rate of 0.1% per cycle at 1C after 300 cycles.
[1] Liu Y,Li X,Haridas A K,et al.Biomass-derived graphitic carbon encapsulated Fe/Fe3C composite as an anode material for high-performance lithium ion batteries[J].Energies,2020,827,13(4):1-10.
[2] Wu K S,Hu Y,Shen Z,et al.Highly efficient and green fabrication of a modified C nanofiber interlayer for high-performance Li-S batteries[J].Journal of Materials Chemistry A,2018,6(6):2693-2699.
[3] Deng N P,Liu Y,Li Q X,et al.Functional mechanism analysis and customized structure design of interlayers for high performance Li-S battery[J].Energy Storage Materials,2019,23(23):314-349.
[4] 姚真东,魏巍,王久林,等.锂硫二次电池正极研究进展[J].物理化学学报,2011,27(5):1005-1016.
[5] Xiang Y Y,Wang Z,Qiu W J,et al.Interfacing soluble polysulfides with a SnO2 functionalized separator:an efficient approach for improving performance of Li-S battery[J].Journal of Membrane Science,2018,563:380-387.
[6] Li Z,Zhang J T,Chen Y M,et al.Pie-like electrode design for high-energy density lithium-sulfur batteries[J].Nature Communications,2015,6:1-8.
[7] Wang Y,Huang J Y,Lu J G,et al.Fabricating ultrathin ZrB2/Graphene oxide/carboxymethocel layer onto cathode as effective polysulfide shuttling barrier for Li-S battery[J].Electrochimica Acta,2019,321:134694.
[8] Zhu F S,Zhang M G,Cao X Y.CeO2/GR interlayer prepared to reinforce the cathode and promote the electrochemical performance of lithium-sulfur batteries[J].Synthetic Metals,2021,282:116955.
[9] 邓磊,徐赛男,吴锋,等.金属有机骨架材料在锂硫电池正极中的应用[J].中国材料进展,2020,39(7):9.
[10] Park G D,Kang Y C.Aerosol-assisted synthesis of porous and hollow carbon-carbon nanotube composite microspheres as sulfur host materials for high-performance Li-S batteries[J].Applied Surface Science,2019,495:143631.
[11] Wu J,Zhang X X,Zhao Z,et al.Hierarchical carbon microtubes from willow catkins for Li-S batteries[J].Materials Letters,2020,261:127079.
[12] Zhu F S,Zhang M G,Wang L,et al.Synthesis and electrochemical performance of CeO2@CNTs/S composite cathode for Li-S batteries[J].Journal of Solid State Electrochemistry,2021,25(10-11):2625-2637.
[13] Ahn H,Kim Y,Bae J,et al.A multifunctional SnO2-nanowires/carbon composite interlayer for high-performance lithium-sulfur batteries[J].Chemical Engineering Journal,2020,401:126042.
[14] Li C X,Li Z Q,Li Q,et al.MOFs derived hierarchically porous TiO2 as effective chemical and physical immobilizer for sulfur species as cathodes for high-performance lithium-sulfur batteries[J].Electrochimica Acta,2016,215:689-698.
[15] Waqas M,Han Y P,Chen D J,et al.Molecular ‘capturing’ and ‘seizing’ MoS2/TiN interlayers suppress polysulfide shuttling and self-discharge of Li-S batteries[J].Energy Storage Materials,2020,27:333-341.
[16] Qiao Z S,Zhou F,Zhang Q F,et al.Chemisorption and electrocatalytic effect from CoxSny alloy for high performance lithium sulfur batteries[J].Energy Storage Materials,2019,23:62-71.
[17] Wang Y Z,Hu R S,Liu Y,et al.The enhanced catalytic performance of Mg2+-doped CuCr2O4 catalyst in ethane oxychlorination[J].Journal of Catalysis,2019,373:228-239.
[18] Li Z,Wu H B and Lou X W.Rational designs and engineering of hollow micro-/nanostructures as sulfur hosts for advanced lithium-sulfur batteries[J].Energy & Environmental Science,2016,9(10):3061-3070.
[19] Lv C C,Liang B L,Li K X,et al.Boosted activity of graphene encapsulated CoFe alloys by blending with activated carbon for oxygen reduction reaction[J].Biosensors & Bioelectronics,2018,117:802-809.
[20] Hu Y,Cheng C,Yan T R,et al.Catalyzing polysulfide redox conversion for promoting the electrochemical performance of lithium-sulfur batteries by CoFe alloy[J].Chemical Engineering Journal,2021,421:129997.
[21] Yuan T Z,Jiang Y Z,Sun W P,et al.Ever-increasing pseudocapacitance in RGO-MnO-RGO sandwich nanostructures for ultrahigh-yate lithium storage[J].Advanced Functional Materials,2016,26(13):2198-2206.
[22] Belgibayeva A,Taniguchi I.Insights into the improved electrochemical performance of lithium-sulfur battery with free-standing SiO2/C composite nanofiber mat interlayer[J].Journal of Power Sources,2021,484:229308.
[23] Li Y D,Wang Q,Zheng D G,et al.The effect of cerium oxide addition on the electrochemical properties of lithium-sulfur batteries[J].Journal of Alloys and Compounds,2019,787:982-989.
基金资助
山西省高等学校科技创新项目(2021L576)
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