硅/聚丙烯腈(Si/PAN)纳米纤维通过简单的电纺丝方法制备出锂离子电池的电极材料,并对其进行干燥、热处理和碳化处理制得Si/C自支撑锂离子电池负极材料。该材料尺寸可调,且具有良好的柔性。通过XRD、SEM、TG-DSC、拉曼光谱和电化学性能测试分别对其结构、形貌和电化学性能等进行分析测试。结果表明,硅含量较低时,自支撑结构碳纤维能够有效缓解纳米硅的体积膨胀,提供了足够的空间来适应充电/放电期间的体积膨胀。Si的加入能够有效地增加其容量,当纳米硅粉含量为0.025g时,自支撑材料表现出最佳的综合性能,并且材料柔性极佳,可直接作为锂离子电池负极使用。
The Si/PAN nanofiber was prepared by electrospinning method,and subjected to heat treatment and carbonization treatment to obtain silicon-carbon (Si/C) free-standing nanofiber material for lithium ion battery negative electrode.The Si/C material prepared had adjustable size and good flexibility.XRD,SEM,TG-DSC,Raman and electrochemical performance tests were used to analyze and test its structure,morphology and electrochemical performance.The results showed that when the silicon content was low,the free-standing structure carbon fiber can effectively alleviate the volume expansion of nano-silicon,and provided enough space to adapt to the volume expansion during charging/discharging.The addition of Si can effectively increase its capacity.When the nano silicon powder content was 0.025g,the material showed the best comprehensive performance,and the material was extremely flexible,which can be directly used as the negative pole of lithium ion battery.
[1] Wu H,Zheng G,Liu N,et al.Engineering empty space between Si nanoparticles for lithium-ion battery anodes[J].Nano Letters,2012,12(2):904-909.
[2] Sui D,Xie Y,Zhao W,et al.A high-performance ternary Si composite anode material with crystal graphite core and amorphous carbon shell[J].Journal of Power Sources,2018,384:328-333.
[3] Sourice J,Quinsac A,Leconte Y,et al.One-step synthesis of Si@C nanoparticles by laser pyrolysis:high-capacity anode material for lithium-ion batteries[J].ACS Applied Materials & Interfaces,2015,7(12):6637-6644.
[4] Dou F,Shi L,Song P,et al.Design of orderly carbon coatings for SiO anodes promoted by TiO2 toward high performance lithium-ion battery[J].Chemical Engineering Journal,2018,338:488-495.
[5] Guo X,Sun B,Su D,et al.Recent developments of aprotic lithium-oxygen batteries:functional materials determine the electrochemical performance[J].Science Bulletin,2017,62(6):442-452.
[6] Abraham K M.Prospects and limits of energy storage in batteries[J].Journal of Physical Chemistry Letters,2015,6(5):830-844.
[7] Scrosati B,Hassoun J,Sun YK.Lithium-ion batteries.a look into the future[J].Energy & Environmental Science,2011,4:3287-3295.
[8] Zhuang X,Chen G,Shi L,et al.Coralloid-like nanostructured c-nSi/SiOx@Cy anodes for high performance lithium ion battery[J].ACS Applied Materials & Interfaces,2017,9(34):28464-28472.
[9] Wu H,Cui Y.Designing nanostructured Si anodes for high energy lithium ion batteries[J].Nano Today,2012,7(5):414-429.
[10] Wang X,Lv L,Cheng Z,et al.High-density monolith of N-doped holey graphene for ultrahigh volumetric capacity of Li-ion batteries[J].Advanced Energy Materials,2016,6(6):1502100.
[11] Zhang W J.A review of the electrochemical performance of alloy anodes for lithium-ion batteries[J].Journal of Power Sources,2011,196(1):13-24.
[12] Maruyama H,Nakano H,Ogawa M,et al.Improving battery safety by reducing the formation of Li dendrites with the use of amorphous silicon polymer anodes[J].Scientific Reports,2015,5(1):13219.
[13] Liang B,Liu Y,Xu Y.Silicon-based materials as high capacity anodes for next generation lithium ion batteries[J].Journal of Power Sources,2014,267:469-490.
[14] Luo W,Chen X,Xia Y,et al.Surface and interface engineering of silicon-based anode materials for lithium-ion batteries[J].Advanced Energy Materials,2017,7(24):1701083.1-1701083.1-1701083.28.
[15] Ling M,Xu Y,Zhao H,et al.Dual-functional gum arabic binder for silicon anodes in lithium ion batteries[J].Nano Energy,2015,12:178-185.
[16] Idrees M,Batool S,Kong J,et al.Polyborosilazane derived ceramics-Nitrogen sulfur dual doped graphene nanocomposite anode for enhanced lithium ion batteries[J].ElectrochimicaActa,2019,296,925-937.
[17] Zhou X,Yin Y X,Wan L J,et al.Self-assembled nanocomposite of silicon nanoparticles encapsulated in graphene through electrostatic attraction for lithium-ion batteries[J].Advanced Energy Materials,2012,2(9):1086-1090.
[18] Kim Y Y,Lee J H,Kim H J.Nanoporous silicon flakes as anode active material for lithium-ion batteries[J].Physica E:Low-dimensional Systems and Nanostructures,2017,85:223-226.
[19] Wen Z,Lu G,Mao S,et al.Silicon nanotube anode for lithium-ion batteries[J].Electrochemistry Communications,2013,29:67-70.
[20] Chen L,Yan B,Xu J,et al.Bicontinuous structure of Li3V2(PO4)3 clustered via carbon nanofiber as high-performance cathode material of Li-ion batteries[J].ACS Appl Mater Interfaces,2015,7(25):13934-13943.
[21] 高鹏飞.锂离子电池硅基复合负极材料的制备及电化学研究[D].上海:上海交通大学,2013.
[22] Wu J,Qin X,Miao C,et al.A honeycomb-cobweb inspired hierarchical core-shell structure design for electrospun silicon/carbon fibers as lithium-ion battery anodes[J].Carbon,2016,98:582-591.
[23] Zhu J,Ren Y,Yang B,et al.Embedded Si/graphene composite fabricated by magnesium-thermal reduction as anode material for lithium-ion batteries[J].Nanoscale Research Letters,2017,12(1):627.
基金资助
四川省科技计划项目(2018FZ0071);四川省科技创新苗子工程资助项目(2019069);四川轻化工大学研究生创新基金(y2020039)
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