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湿浸渍法合成LiMnBO_3/C复合材料及其电化学性能（英文）

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稀有金属材料与工程 2017年第1期46卷 78-82页

作者：唐安平何则强徐国荣彭荣华宋海申湖南科技大学理论有机化学与功能分子教育部重点实验室湖南湘潭411201 吉首大学湖南吉首416000

以三维网络结构的科琴黑(KB)为模板和导电骨架,采用湿浸渍法合成了六方结构的LiMnBO_3/C复合材料。用X射线衍射、扫描电镜和氮吸附等测试技术分别对样品的微观结构、形貌和比表面积进行了表征。用恒流充放电和循环伏安对复合材料的电化... 详细信息

以三维网络结构的科琴黑(KB)为模板和导电骨架,采用湿浸渍法合成了六方结构的LiMnBO_3/C复合材料。用X射线衍射、扫描电镜和氮吸附等测试技术分别对样品的微观结构、形貌和比表面积进行了表征。用恒流充放电和循环伏安对复合材料的电化学性能进行了研究。当LiMnBO_3/C复合材料以C/20倍率进行锂离子脱嵌性能测试时,30周循环后放电容量保持率为87.4%,表现出优良的循环稳定性。当电流从C/20、C/10增至C/5时,复合材料的首次放电比容量依次为138.8、124.5和100.5 m Ah·g^(-1),表明复合材料具有良好的倍率性能。

关键词： LiMnBO3 锂离子电池正极

沥青调制温度对活性炭材料结构及电容特性的影响

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中国有色金属学报 2007年第3期17卷 481-486页

作者：李劼宋海申李荐李晶赖延清张治安卢海中南大学冶金科学与工程学院长沙410083

以煤焦油沥青为原料,在不同温度下调制得到碳质微晶结构的中间相沥青,采用化学活化法制得超级电容器用高比表面积活性炭。以制备的活性炭作电极材料组装模拟电容器,6mol/L KOH溶液为电解液,考察了中间相沥青的调制温度对活性炭结构和电... 详细信息

以煤焦油沥青为原料,在不同温度下调制得到碳质微晶结构的中间相沥青,采用化学活化法制得超级电容器用高比表面积活性炭。以制备的活性炭作电极材料组装模拟电容器,6mol/L KOH溶液为电解液,考察了中间相沥青的调制温度对活性炭结构和电容行为的影响。结果表明:随着调制温度的提高,活性炭比表面积先增加后减小,在450℃时达到最大值,为3250m2/g;制备的活性炭孔径主要集中在1～4nm范围内;在350℃时,无定形结构的中间相沥青有利于扩孔,制得的活性炭具有较高的中孔含量;随着调制温度的继续提高,中孔含量下降;活性炭比电容量随着调制温度的提高先增大后减小,450℃时达到最大值,为215F/g。

关键词：超级电容器中间相沥青活性炭化学活化

LiPF_6/LiBOB混合锂盐改善LiFePO_4/石墨动力电池高温循环性能研究

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功能材料 2013年第19期44卷 2849-2853页

作者：宋海申赖延清李劼刘业翔张治安中南大学冶金科学与工程学院湖南长沙410083 中南大学深圳研究院深圳高性能电池材料与器件工程研究中心广东深圳518057

分别以LiPF6、LiBOB和LiPF6/LiBOB混合盐为电解质,研究了不同电解液对LiFePO4/石墨动力电池高温循环性能的影响。结果表明,LiBOB盐抑制了正极溶铁行为,并提高了正极高温循环充放电效率;由于LiBOB基电解液对正极的保护及在负极表面良好... 详细信息

分别以LiPF6、LiBOB和LiPF6/LiBOB混合盐为电解质,研究了不同电解液对LiFePO4/石墨动力电池高温循环性能的影响。结果表明,LiBOB盐抑制了正极溶铁行为,并提高了正极高温循环充放电效率;由于LiBOB基电解液对正极的保护及在负极表面良好的成膜作用,使得LiFePO4/石墨电池高温循环性能得到明显改善,但是增大了电池阻抗。LiPF6/LiBOB混合盐可以发挥LiBOB盐的优点增加正极稳定性,在石墨表面形成致密的SEI膜并能够有效改善电池高温循环性能,同时避免了单纯使用LiBOB盐时阻抗较高的缺点。使用LiPF6/LiBOB混合盐,利用LiPF6盐低阻抗特性及LiBOB盐对正、负电极的保护作用,可以有效提高电池电化学性能。

关键词：动力电池 LiBOB 混合盐 LiFePO4 循环高温

Effect of vinylene carbonate as electrolyte additive on cycling performance of LiFePO_4/graphite cell at elevated temperature

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Transactions of Nonferrous Metals Society of China 2014年第3期24卷 723-728页

作者：宋海申曹政张治安赖延清李劼刘业翔中南大学冶金与环境学院长沙410083 中南大学深圳研究院深圳高性能电池材料与器件工程研究中心深圳518057

Effects of film-forming additive on stability of electrode and cycling performance of LiFePO4/graphite cell at elevated temperature were studied. Two 18650 cells with and without VC additive were investigated by galvanostatic cycling, electrochemical impedance spectroscopy, scanning electron microscopy, energy-dispersive X-ray analysis and Raman spectroscopy. The results show that in the presence of VC additive, dissolution of Fe from LiFePO4 material is greatly depressed and stability of graphite structure is improved; the additive can not only reduce reaction of electrolyte on surface of LiFePO4 electrode but also suppress reduction of solvent and thickening of the solid electrolyte interface （SEI） layer on graphite surface. Electrolyte with VC is considered to be a good candidate for improving cycling performance of the LiFePOa/graphite cell at elevated temperature.

关键词： LiFeP04 vinylene carbonate electrolyte additive cycling performance

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活化剂种类对活性炭结构及性能的影响

中南大学学报（自然科学版） 2011年第4期42卷 865-870页

作者：王新宇孙晓峰张治安宋海申赖延清刘业翔中南大学冶金科学与工程学院湖南长沙410083

以石油焦为前驱体,分别以KOH,NaOH,K2CO3和Na2CO3为活化剂通过化学活化制备活性炭,采用振实密度仪和全自动N2吸附仪研究活性剂对活性炭结构的影响,并以制备的活性炭为电极材料,1 mol/L Et4NBF4/PC为电解液组装模拟电容器,采用LAND快速... 详细信息

以石油焦为前驱体,分别以KOH,NaOH,K2CO3和Na2CO3为活化剂通过化学活化制备活性炭,采用振实密度仪和全自动N2吸附仪研究活性剂对活性炭结构的影响,并以制备的活性炭为电极材料,1 mol/L Et4NBF4/PC为电解液组装模拟电容器,采用LAND快速采样电池测试仪和电化学工作站考察不同活化剂对活性炭电化学性能的影响。研究结果表明:KOH具有最强的活化能力,其活化制备的活性炭具有较高的微孔含量和发达的孔隙结构,比表面积达2 362 m2/g,孔容达到1.263 cm3/g,以其作电极材料,表现出良好的电容行为,质量比容量最高达到128.0 F/g,随着活化剂碱性的降低,活化能力大幅度降低,制备的活性炭比表面积和孔容急剧减小,K2CO3和Na2CO3不适合用作活化石油焦制备活性炭的活化剂。

关键词：超级电容器活性炭石油焦活化剂

二步煅烧法合成Li_4Ti_5O_(12)材料的性能

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中国有色金属学报 2012年第4期22卷 1235-1241页

作者：宋海申李涛高宏权张治安赖延清李劼刘业翔中南大学冶金科学与工程学院长沙410083 中国铝业股份有限公司郑州研究院郑州450041

采用超声活化对原材料Li2CO3和TiO2进行预处理,并采用二步煅烧方法制备Li4Ti5O12材料。利用X射线衍射仪、扫描电镜和电池充放电测试仪研究二步煅烧条件对材料结构、形貌及电化学性能的影响,并得到二步煅烧的最佳工艺。结果表明:采用600... 详细信息

采用超声活化对原材料Li2CO3和TiO2进行预处理,并采用二步煅烧方法制备Li4Ti5O12材料。利用X射线衍射仪、扫描电镜和电池充放电测试仪研究二步煅烧条件对材料结构、形貌及电化学性能的影响,并得到二步煅烧的最佳工艺。结果表明:采用600℃预烧温度制备的材料具有较高的纯度和结晶度;800℃高温煅烧温度下制备的Li4Ti5O12材料具有均一分散的颗粒结构;超声活化制备Li4Ti5O12的最佳煅烧工艺是600℃预烧8 h后800℃高温煅烧10 h,制备的材料在0.1C倍率下首次放电容量达170.6 mA.h/g,0.2C倍率下20次循环后的放电比容量由152 mA.h/g降至150 mA.h/g,容量保持率为98.7%。

关键词： Li4Ti5O12 超声活化二步煅烧锂离子电池

Influence of KOH activation techniques on pore structure and electrochemical property of carbon electrode materials

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Journal of Central South University of Technology 2006年第4期13卷 360-366页

作者：李晶李劼赖延清宋海申张治安刘业翔 School of Metallurgical Science and Engineering Central South University

Taking the selection of coal-tar pitch as precursor and KOH as activated agent, the activated carbon electrode material was fabricated for *** surface area and the pore structure of activated carbon were analyzed by Nitro adsorption method. The electrochemical properties of the activated carbons were determined using two-electrode capacitors in 6 mol/L KOH aqueous electrolytes. The influences of activated temperature and mass ratio of KOH to C on the pore structure and electrochemical property of porous activated carbon were investigated in detail. The reasons for the changes of pore structure and electrochemical performance of activated carbon prepared under different conditions were also discussed theoretically. The results indicate that the maximum specific capacitance of 240 F/g can be obtained in alkaline medium, and the surface area, the pore structure and the specific capacitance of activated carbon depend on the treatment methods; the capacitance variation of activated carbon cannot be interpreted only by the change of surface area and pore structure, the lattice order and the electrolyte wetting effect of the activated carbon should also be taken into account.

关键词： supercapacitor activated carbon chemical activation pore structure specific capacitance

Preparation and properties of pitch carbon based supercapacitor

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Journal of Central South University of Technology 2007年第5期14卷 601-606页

作者：刘业翔李晶赖延清宋海申张治安 School of Metallurgical Science and Engineering Central South University

Using the mesophase pitch as precursor, KOH and CO2 as activated agents, the activated carbon electrode material was fabricated by physical-chemical combined activated technique for supercapacitor. The influence of activated process on the pore structure of activated carbon was analyzed and 14 F supercapacitor with working voltage of 2.5 V was prepared. The charge and discharge behaviors, the properties of cyclic voltammetry, specific capacitance, equivalent serials resistance （ESR）, cycle properties, and temperature properties of prepared supercapacitor were examined. The cyclic voltammetry curve results indicate that the carbon based supercapacitor using the self-made activated carbon as electrode materials shows the desired capacitance properties. In 1 mol/L Et4NBF4/AN electrolyte, the capacitance and ESR of the supercapacitor are 14.7 F and 60 mΩ respectively, The specific capacitance of activated carbon electrode materials is 99.6 F/g; its energy density can reach 2,96 W.h/kg under the large current discharge condition, There is no obvious capacitance decay that can be observed after 5000 cycles, The leakage current is below 0,2 mA after keeping the voltage at 2.5 V for l h, Meanwhile, the supercapacitor shows desired temperature property; it can be operated normally in the temperature ranging from -40 ℃to 70 ℃,

关键词： carbon based supercapacitor physical-chemical combined activation specific capacitance equivalent serials resistance temperature property

Preparation of activated carbons from mesophase pitch and their electrochemical properties

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Journal of Central South University of Technology 2007年第5期14卷 633-637页

作者：赖延清李晶宋海申张治安李劼刘业翔 School of Metallurgical Science and Engineering Central South University

The influences of molar ratio of KOH to C and activated temperature on the pore structure and electrochemical property of porous activated carbon from mesophase pitch activated by KOH were investigated. The surface areas and the pore structures of activated carbons were analyzed by nitrogen adsorption, and the electrochemical properties of the activated carbons were studied using two-electrode capacitors in organic electrolyte. The results indicate that the maximum surface area of 3 190 m2/g is obtained at molar ratio of KOH to C of 5:1, the maximum specific capacitance of 122 F/g is attained at molar ratio of KOH to C of 4:1, and 800 ℃ is the proper temperature to obtain the maximum surface area and capacitance.

关键词： supercapacitor activated carbon mesophase pitch chemical activation pore structure electrochemical properties