化工新型材料

化工新型材料 ›› 2024, Vol. 52 ›› Issue (12) : 164-169. DOI: 10.19817/j.cnki.issn1006-3536.2024.12.015

科学研究

V₂O₅/Ca_xV₂O₅复合材料的合成及其电化学性能研究

作者信息 +

Synthesis and electrochemical properties of V₂O₅/Ca_xV₂O₅ composites

Peng Liangkui, Chen Hongyou, Yuan Yifan, Zhang Jincheng, Cheng Lu, Zhou Huimin

Author information +

文章历史 +

Received		Published
2023-10-18		2024-12-20
Issue Date	Revised Date
2024-12-12	2023-10-18

PDF

摘要

为了改善五氧化二钒的电化学稳定性,采用水热法一步合成了V与Ca摩尔比不同的五氧化二钒/钙掺杂五氧化二钒(V₂O₅/Ca_xV₂O₅)复合材料,以V₂O₅/Ca_xV₂O₅作为正极,金属锂片作为负极组装成电池,通过扫描电子显微镜、X射线衍射仪、X射线光电子能谱仪等对复合材料的微观形貌、结构和元素组成进行了分析,通过电化学工作站对复合材料进行阻抗测试和循环伏安测试,研究了微观形貌和元素掺杂对复合材料电化学性能的影响。结果表明:Ca元素的掺杂使V₂O₅由纳米棒转化为纳米线,并且有利于提高电极的容量保持率,但Ca_xV₂O₅放电比容量较V₂O₅低,过量添加Ca元素会严重影响材料的储锂性能;当n(V)∶n(Ca)=1∶0.12时,V₂O₅/Ca_xV₂O₅复合材料储锂性能和循环稳定性达成平衡,初始放电比容量为100.7mAh/g,循环100圈容量保持率为58.9%,循环100圈总放电比容量为7332mAh/g。

Abstract

To enhance the electrochemical stability of V₂O₅,V₂O₅/Ca_xV₂O₅ composites with different molar ratios of V to Ca were synthesized in a single step using a hydrothermal method.Batteries were assembled using V₂O₅/Ca_xV₂O₅ as the cathode and lithium metal sheets as the anode.The microstructure,structure,and elemental composition of the composites were analyzed using scanning electron microscopy,X-ray diffraction,and X-ray photoelectron spectroscopy.Impedance testing and cyclic voltammetry were performed on the composites using an electrochemical workstation to investigate the effects of microstructure and element doping on the electrochemical performance of the composites.The results indicated that the doping of Ca transformed V₂O₅ from nanorods to nanowires and was beneficial for improving the capacity retention rate of the electrode.However,the specific discharge capacity of Ca_xV₂O₅ was lower than that of V₂O₅,and excessive addition of Ca significantly affected the lithium storage performance of the material.When the molar ratio of n(V)∶n(Ca) was 1∶0.12,the V₂O₅/Ca_xV₂O₅ composite achieved a balance between lithium storage performance and cycle stability,with an initial specific discharge capacity of 100.7mAh/g,a capacity retention rate of 58.9% after 100 cycles,and a total specific discharge capacity of 7332mAh/g after 100 cycles.

关键词

五氧化二钒 / 钙掺杂 / 电化学性能 / 水热法 / 复合材料

Key words

V₂O₅ / Ca doping / electrochemical properties / hydrothermal method / composite material

引用本文

引用格式 ▾

V₂O₅/Ca_xV₂O₅复合材料的合成及其电化学性能研究[J]. 化工新型材料, 2024, 52(12): 164-169 DOI:10.19817/j.cnki.issn1006-3536.2024.12.015

登录浏览全文

4963

注册一个新账户忘记密码

参考文献

原文顺序 | 出版日期 | 本文引用

[1] Wang L,Wu Z,Zou J,et al.Li-free cathode materials for high energy density lithium batteries[J].Joule,2019,3(9):2086-2102.
[2] Cao J,Xu H,Zhong J,et al.Dual-carbon electrode-based high-energy-density potassium-ion hybrid capacitor[J].ACS Applied Materials & Interfaces,2021,13(7):8497-8506.
[3] Fang R,Zhao S,Wang D W,et al.Micro-macroscopic coupled electrode architecture for high-energy-density lithium-sulfur batteries[J].ACS Applied Energy Materials,2019,2(10):7393-7402.
[4] Kim J Y,Park J,Lee M J,et al.Diffusion-dependent graphite electrode for all-solid-state batteries with extremely high energy density[J].ACS Energy Letters,2020,5(9):2995-3004.
[5] Ray A,Roy A,Sadhukhan P,et al.Electrochemical properties of TiO₂-V₂O₅ nanocomposites as a high performance supercapacitors electrode material[J].Applied Surface Science,2018,443:581-591.
[6] Huan N P,Park S K,Shin K H,et al.Hierarchically structured vanadium pentoxide/reduced graphene oxide composite microballs for lithium ion battery cathodes[J].Journal of Power Sources,2019,436:226854.
[7] Natarajan S,Kim S J,Aravindan V.Restricted lithiation into a layered V₂O₅ cathode towards building “rocking-chair” type Li-ion batteries and beyond[J].Journal of Materials Chemistry A,2020,8(19):9483-9495.
[8] 韦玉红,华骏,彭商权,等.TiO₂包覆对V₂O₅锂离子电池负极材料电化学性能的影响[J].稀有金属与硬质合金,2023,51(2):90-97.
[9] Zhang Y,Zou Z,Liu J,et al.Effect of Ga doping on structure and properties of V₂O₅ lithium-ion batteries[J].Materials Technology,2020,35(13/14):887-895.
[10] 李建科,刘颖,陈绍贝,等.三维多级结构的V₂O₅/C锂离子电池正极材料的制备[J].炭素技术,2022,41(4):33-37;88.
[11] Peng X,Zou Z,Ling W,et al.Fe-doped V₂O₅ layered nanowire cathode material with high lithium storage performance[J].Nanotechnology,2023,34(23):235602.
[12] Tolosa A,Fleischmann S,Grobelsek I,et al.Electrospun hybrid vanadium oxide/carbon fiber mats for lithium-and sodium-ion battery electrodes[J].ACS Applied Energy Materials,2018,1(8):3790-3801.
[13] Deng S Y,Jiang Y,Huang D,et al.Driving intercalation kine-tic through hydrated Na⁺ insertion in V₂O₅ for high rate performance aqueous zinc ion batteries[J].Journal of Alloys and Compounds,2022,891:161946.
[14] 马艺宁.层状结构钒氧基化合物的制备及电化学性能研究[D].上海:中国科学院大学(中国科学院上海硅酸盐研究所),2018.
[15] Wang B,Huang Y,Han Y,et al.Single tungsten atoms modified porous V₂O₅ nanoflowers with enhanced electrochromic performance[J].Cell Reports Physical Science,2023,4(5):101408.
[16] Zhang H,Rong Y,Jia W,et al.Simple solvent-free synthesis of rod-like Cu-doped V₂O₅ for high storage capacity cathode materials of lithium ion batteries[J].Journal of Alloys and Compounds,2019,802:139-145.
[17] Chen P,Zheng G,Guo G,et al.Ce-doped V₂O₅ microspheres with improved electrochemical performance for high-power rechargeable lithium ion batteries[J].Journal of Alloys and Compounds,2019,784:574-583.
[18] Xue L,Li Y,Lin W,et al.Electrochemical properties and facile preparation of hollow porous V₂O₅ microspheres for lithium-ion batteries[J].Journal of Colloid and Interface Science,2023,638:231-241.
[19] He Y,Xu H,Liu F,et al.Structural evolution of dendritic-structured Mg0.01V₂O₅ film electrodes of lithium-ion batteries during cycling[J].Electrochimica Acta,2023,446:142078.
[20] Cao Z,Zuo C,Liu Z.Controlled solution combustion synthesis of Ni incorporated rice-shape V₂O₅ cathode material for stable lithium ion battery[J].Materials Chemistry and Physics,2023,309:128375.