共查询到20条相似文献，搜索用时 125 毫秒
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目的:为提高锂离子电池循环稳定性和倍率性能,制备具有高容量、长寿命、强导电性的负极材料.方法:Hummers法制备氧化石墨烯(GO)作为复合材料的基底物质,水热法有效合成ZnSe/rGO复合电极材料.在硒化锌高的理论容量和石墨烯强的电子导电性的协同作用下,使合成的复合材料获得优异的锂离子电池性能.结果:将ZnSe/rGO复合物作为锂电负极材料进行性能测试,相较于纯ZnSe材料,不仅具有稳定循环性能(0.5 A/g电流密度下,循环200圈容量每圈仅衰减0.097％),还具有优异的倍率性能(高达10 A/g电流密度下,容量依然保持322 mAh/g).结论:ZnSe/rGO复合电极材料由于其独特的表面结构和增强的电导性,可以有效提高锂离子电池整体电化学性能. 相似文献
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成功制备了氧缺陷型Sb2O3-x/rGO复合材料.与纯Sb2O3材料相比,Sb2O3-x/rGO复合材料颗粒尺寸大大减小,导电性能得到提高,作为锂离子电池的负极材料,具有更高的可逆能力、更好的循环稳定性和良好的倍率性能.在电流密度为100 mAh·g^-1的情况下,Sb2O3-x/rGO复合材料的初始放电容量可达1336.6 mAh·g^-1.即使经过50次充放电循环后,其充放电容量依然可以保持在405.8 mAh·g^-1. 相似文献
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锡基氧化物在锂离子二次电池负极材料方面具有广阔的应用前景.本文简述了二氧化锡锂离子电池负极材料的研究进展与贮锂机理,总结了锡基氧化物的合成方法及其性能,并对其发展前景进行了展望. 相似文献
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以红磷、锡粉和还原氧化石墨烯作为主要反应物,利用机械球磨法成功合成磷化锡/还原氧化石墨烯(Sn_4P_3/RGO)复合材料,并用作钠离子电池的负极材料.采用X射线粉末衍射仪(XRD)、扫描电子显微镜(SEM)、蓝电测试系统和电化学工作站对所获得的样品粉末进行物相、微观形貌以及电化学性能表征.与纯相Sn_4P_3相比, Sn_4P_3/RGO复合材料作为钠离子电池负极材料展示出较为优异的电化学性能. 相似文献
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利用水热法成功合成了Fe2O3/石墨烯(RGO)锂离子电池负极材料.导电性能良好的石墨烯网络起到连接导电性能极差的Fe2O3和集流体的作用.电化学性能测试表明,180℃下得到的Fe2O3/RGO具有良好的比容量和循环稳定性.在不同倍率充放电过程中,初始放电比容量为1023.6mAh/g(电流密度为40mA/g),电流密度增加到800mA/g时,放电比容量维持在406.6mAh/g,大于石墨的理论放电比容量～372mAh/g.在其他较高的电流密度下比容量均保持基本不变.该Fe2O3/RGO有望成为高容量、低成本、低毒性的新一代锂离子电池负极材料. 相似文献
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锂离子二次电池用锡基负极材料具有高容量、低成本等优势,是目前高容量负极材料的研究热点之一。本文介绍了锂离子二次电池用锡基负极材料的特点及其储锂机理,综述了几种锡基材料的制备方法及性能,并讨论了它们的优缺点。 相似文献
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从石墨改性的本质出发,综述了锂离子电池石墨负极材料的改性方法:表面包覆法和掺杂其它元素等.通过改性处理,可有效降低石墨的比表面积,从而大幅度提高石墨负极材料的首次可逆容量和库仑效率,改善电池的循环性能. 相似文献
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《邢台职业技术学院学报》2019,(3):77-80
锂离子电池的安全性与电池的热性能有关,在充放电过程中对锂离子电池进行热分析有利于提高新能源汽车的安全性。对以Fe_3O_4/Fe-Go和Fe_3O_4/Go纳米复合材料为正极和负极制备的锂离子电池进行热分析,首先对锂离子电池进行数学建模,然后利用ANSYS FLUENT软件对电池温度分布进行了仿真,结果表明,电池表面对流传热系数可以抑制电池表面温度,通过改变电池组放电速率,电池组表面温差和电池内部温差也会增大。 相似文献
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《浙江大学学报(A卷英文版)》2020,(5)
目的:电动汽车和大规模储能的发展对锂离子电池的能量密度提出了更高的要求,但现有商业石墨负极容量难以满足要求。本文结合石墨烯高电导和高容量的优点以及中间相碳微球材料循环稳定性优良的优势,研究和报道一种容量高和循环性能好的石墨烯/中间相碳微球复合负极材料。方法:1.通过选择高电导率石墨烯和中间相碳微球,制备石墨烯和中间相碳微球复合负极材料。2.选用商业聚偏氟乙烯(PVDF)粘结剂,制备复合材料电极极片,测试和表征电极的形貌、电导以及半电池的充放电等电化学性能,并优化复合材料质量比。3.选择优化的复合负极材料(GMC(8:2)),研究其长循环性能。结论:中间相碳微球的球形结构能有效防止石墨烯的折叠团聚,从而发挥石墨烯的高电导性能。因此,石墨烯/中间相碳微球复合负极材料表现出了很好的倍率性能和循环性能,且其容量达到了421 mA·h/g以上,高于商业石墨的理论容量,具有潜在的应用前景。 相似文献
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采用水热法制备了锂离子电池正极材料LiV3O8,通过X射线衍射(XRD)、红外光谱(FT-IR)和扫描电子显微镜(SEM)表征研究了样品的结构和形貌特征;通过恒流充放电技术测试了样品的电化学性质.结果表明,水热法制备的LiV3O8样品由棒状颗粒组成,粒径约0.5μm,棒长约1-3μm.首次放电容量为276mAh/g.所制备LiV3O8材料具有较高的初始放电比容量和良好的循环性能. 相似文献
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橄榄石型结构的LiFePO4是一种新的锂离子电池正极材料。从提高材料的稳定性及降低锂离子电池的生产成本两方面出发,研究了用高温固相法合成橄榄石LiFePO4时,温度对其结构及电化学性能的影响。在氮气保护下,采用高温固相反应法在350oC预分解5h,650℃焙烧24h制备的LiFePO4具有较好的晶形、放电容量和循环性能,其首次放电容量达到92mAh／g,40次循环后放电容量达到77mAh／g,容量衰减16％。 相似文献
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以LiMn1.5Ni0.5O4为锂离子电池备选的正极活性物质,通过充放电试验、X射线衍射试验、循环伏安试验等,研究其作为正极材料的电化学性能。 相似文献
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作为镍氢电池负极活性物质,储氢合金是影响电极电化学性能的主要因素,对储氢合金进行表面处理可有效提高镍氢电池电极的电化学性能。实验采用电化学方法对储氢合金表面进行镍磷合金修饰处理,通过扫描电镜(SEM)及EDX能谱对电极表面进行了表征分析,测定了处理前后镍氢电池在1.5C和2C下的大电流放电性能,通过交流阻抗和循环伏安曲线对处理后电极进行了评价。测试结果表明,通过电化学修饰镍磷合金,储氢合金电极的大电流放电性能有所提高,电化学阻抗减小,循环寿命增长,有效提高了镍氢电池的性能。 相似文献
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In this study, a bulk composite material symbolized as NiCo LDH-rGO/Ni F was developed by a solvothermal process for the first time. This material was fabricated through simultaneous growth of nickel-cobalt layered double hydroxide(NiCo LDH) and reduced graphene oxide(rGO) on nickel foam. This bulk composite can be used directly as a binder-free electrode for supercapacitors(SCs). The physicochemical properties of this composite were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The electrochemical properties of the composite were measured by the cyclic voltammetry and galvanostatic charge-discharge. The results show that this composite had a hierarchical structure and exhibited a significantly enhanced specific capacitance of up to 3383 F/g at 1 A/g. The asymmetric SC using this composite as a positive electrode had a high energy density of 40.54 Wh/kg at the power density of 206.5 W/kg and good cycling stability. Owing to the synergies between the metal oxides and the rGO, the preparation method of in situ growth and its hierarchical structure, this bulk composite displayed excellent electrochemical performance and had a promising application as an efficient electrode for high-performance SCs. 相似文献
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Lithium-ion batteries(LIBs) have been developed for over 30 years; however, existing electrode materials cannot satisfy the increasing requirements of high-energy density, stable cycling, and low cost. Here, we present a perovskite-type LaNiO_3 oxide(LNO) as a new negative electrode material. LNO was successfully synthesized by a sol–gel method. The microstructure and electrochemical performance of LNO calcined at various temperatures have been systematically investigated. The LNO electrode shows a high rate capability and long cycling stability. In a C-rate test, a specific capacity of 77 mAh/g was exhibited at 6 C. LNO can also deliver a specific capacity of 92 mAh/g after 200 cycles at 1 C. This paper presents a type of binary metal oxide as a new anode material for high-performance LIBs. 相似文献
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《天津大学学报(英文版)》2020,(4)
FePS_3, a classical 2D layered material with transition metal phosphorous trichalcogenides, was investigated as an anode material for Mg ion batteries. We used density functional theory to calculate the Mg storage properties of FePS_3, such as Mg adsorption energy, theoretical specifi c capacity, average voltage, diff usion energy barriers, volume change, and electronic conductivity. The theoretical specifi c capacity of the FePS_3 monolayer is 585.6 mA h/g with a relatively low average voltage of 0.483 V(vs. Mg/Mg~(2+)), which is favorable to a high energy density. The slight change in volume and good electronic conductivity of bulk FePS 3 are benefi cial to electrode stability during cycling. 相似文献
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Potassium-ion batteries (KIBs) are considered the next powerful potential generation energy storage system because of substantial potassium resource availability and similar characteristics with lithium. Unfortunately, the actual application of KIBs is inferior to that of lithium-ion batteries (LIBs), in which the finite energy density, ordinary circular life, and underdeveloped fabrication technique dominate the key constraints. Various works have recently been directed to growing novel anode electrodes with superior electrochemical capability. Noticeably, metals/metal oxides materials (e.g., Sb, Sn, Zn, SnO2, and MoO2) have been widely investigated as KIBs anodes because of high theoretical capacity, suggesting outstanding promise for high-energy KIBs. In this review, the latest research of metals/metal oxides electrodes for potassium storage is summarized. The major strategies to control the electrochemical property of metals/metal oxides electrodes are discussed. Finally, the future investigation foreground for these anode electrodes has been proposed.
相似文献20.
The performance of Al-alloy anode in 4 mol/L KOH with and without stannate and o-aminophenol at 25℃and 55℃was studied by hydrogen collection,potentiodynamic polarization and electrochemical impedance spectrum,o-amino- phenol acts as a perfect inhibitor because of its adsorbability and forming chelate complex at its optimum concentration of 0.4 mol/L.Stannate enhances the inhibition of o-aminophenol and improves the activity of Al-alloy because of its reduction to tin.There is synergetic effect of stannate with o-aminophenol on the behavior of Al-alloy,and the inhibitive efficiency at 55℃is better than that at 25℃. 相似文献