A Study on the Safety of Lithium Ion Batteries under

锂离子电池作为可靠的能源已经广泛应用于小型电源驱动设备，但由于存在安全性问题，使其在大型电池(例如：电动汽车EV、混合动力汽车HEV、电动工具等)方面的应用受到严重限制。随着锂离子电池的大型化，系统、深入地研究电池的安全性能十分重要，本文着重研究了电池的过充安全性能。向电解液中加入耐过充添加剂是人们研究的一个热点。同时，对锂离子电池LiCoO2材料表面包覆也是提高了电池过充安全性能的重要手段之一。本文在这两个方面开展了系统的工作。电解液方面，根据锂离子电池中电解液添加剂应满足的条件，选用了二甲苯和环己基苯两种电解液添加剂。通过循环伏安的方法研究添加剂的聚合电位，并通过SEM、EIS、XRD等方...Lithium ion batteries have been widely used in various electronic equipment driven by power supply . But they are restricted to apply for large-scale(for example, Electric Vehicle, Hybrid-Electric Vehicle, Electric Instrument) because of safety problems arising from abuse or thermal stabilities. With the large-scale development and application of lithium ion batteries, it is important to research...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：20032512

Study on overcharging additives of Li-ion battery

[中文文摘]环己基苯和二甲苯作为耐过充添加剂加入锂离子电池电解液中。环己基苯和二甲苯分别在4.70 V、4.66 V(vs.Li/Li+)处发生电聚合反应。聚合物几乎全部覆盖在隔膜表面,阻断了反应,改善了电池的安全性。添加5%添加剂的电池,均可耐3C1、0 V过充电,且对电池正常充放电时的电化学性能影响很小。[英文文摘]Cyclohexyl benzene(CB) and xylene as overcharging additives were added into Liion battery electrolyte.CB and xylene could be electrochemically polymerized at 4.70 V and 4.66 V(vs.Li/Li~+),respectively.The polymer mainly deposited on the separator,restrained the reaction and improved the safety performance of the battery.The batteries with the additives could resist overcharge of 3 C,10 V when the content of additive was 5%.There was only a slight influence on the electrochemical performance of the batteries with normal charge-discharge.973项目(2002CB211800); 国家自然科学基金(20373058)；厦门市科技计划项目(3502Z20055018)

Preparation and properties of nano-structured α-MnO_2 as electrode material of supercapacitor

[中文文摘]用KMnO4和MnSO4水溶液作为原料,用液相沉淀法制备无定形-αMnO2.nH2O。对样品进行比表面积测定(BET)、XRD、SEM等测试。通过循环伏安法和恒流充放电测试研究了样品的电化学行为。合成的无定形-αMnO2.nH2O在0.5mol/L的Na2SO4电解液中,在0~0.9 V(vs.SCE)范围内,电流为10 mA,2 mV/s的扫描速度下的比电容可达126.4 F/g。无定形-αMnO2.nH2O是较好的超级电容器电极材料。[英文文摘]Amorphous α-MnO_2·nH_2O was synthesized with chemical coprecipitation method by using KMnO_4 and MnSO_4(aqueous) solution as raw materials.The sample was characterized by BET,XRD and SEM.The electrochemical characteristics of the sample were characterized by CV and constant current charge-discharge tests.The specific capacitance of the amorphous α-MnO_2·nH_2O was 126.4 F/g in 0.5 mol/L Na_2SO_4 electrolyte at the scan rate of 2 mV/s,the current of 10 mA,in the range of 0～(0.9 V)(vs.SCE).The amorphousα2MnO2·nH2O was an excellent electrode material for supercapacitor.973项目(2002CB211800); 国家自然科学基金(20373058); 福建省科技项目(2003H044)

Development of cathode material LiFePO_4 in lithium ion battery

[中文文摘]LiFePO4作为一种新型的锂离子电池正极材料,安全性好,价格低廉,环境友好,循环性能稳定。结合本实验室的研究工作,从合成方法,表征手段,循环性能和电导率等方面综述了近年来LiFePO4的发展概况,并提出了LiFePO4进一步可能的发展趋势。[英文文摘]As a cathode material of lithium ion battery, LiFePO4 possesses some excellent characteristics such as good safety, low cost, environment friendly and satisfactory cycle stability. In this paper, the development of LiFePO4 in recent years is discussed in terms of synthesizing methods, characterization ways, cycling performance and electronic conductivity. The prospect of LiFePO4 in the future is also presented.973项目(2002CB211800); 国家自然科学基金(20373058); 福建省科技项目(2003H044)资助

Effects of Eelectrolyte Salt to the SEI Layer of LiCoO_2 Material

[中文文摘]研究L iPF6、L iC lO4和L iBF43种电解质对L iCoO2材料界面特性的影响.结果表明:化成后的L iCoO2表面存在固态电解质膜(SEI膜);在不同成分的电解液中,L iCoO2表面SEI膜的形成电位、形貌特征以及材料的可逆容量、平均放电电压和电化学反应阻抗不同.[英文文摘]The character of the solid electrolyte interface(SEI layer) on the surface of LiCoO_(2) formed in the electrolytes contained different salt such as LiPF_(6)、LiClO_(4) and LiBF_(4) were studied in this paper.The results showed that the SEI film exists in all three electrolytes after the processes of charge and discharge.The morphological character and the formation voltage of the SEI layer of LiCoO_(2) were different in different electrolytes.The electrochemical performance of the battery such as reversible capacity, average discharge voltage and electrochemical impedance were affected significantly by SEI film formed in different electrolytes.973项目(2002CB211800); 国家自然科学基金(20373058); 厦门市科技计划项目(3502Z20055018)资助

Interaction of 1-Hydroxypyrene with BSA Using Fluorescence Anisotropy and Synchronous Fluorescence Analysis Methods

在模拟生理条件下,应用荧光各向异性法研究了多环芳烃(PAHS)代谢标志物1-羟基芘(1-OHP)与牛血清白蛋白(bSA)的相互作用,并结合同步荧光法研究作用过程中bSA的构型变化,初步探讨了二者的结合方式.研究结果表明,1-OHP与bSA有较强的结合作用,形成1∶1复合物,平均结合平衡常数为3.63x106l/MOl,且其结合作用强弱随着bSA浓度大小发生变化.1-OHP可与bSA的色氨酸残基结合,使bSA构型发生变化,进而使色氨酸残基周围环境的疏水性降低.Fluorescence anisotropy was employed to investigate the interaction of 1-hydroxypyrene( 1-OHP),the metabolism biomarker of PAHs in vivo,with a model transport protein of bovine serum albumin( BSA)under simulated physiological conditions.Combined with synchronous fluorescence spectra,the conformation transition of BSA was also investigated.The experiment results showed that 1-OHP can bind to BSA strongly and a 1 ∶ 1 complex was formed,with an average binding equilibrium constant of 3.63×106L / mol.Also as the amounts of BSA differ,the interaction of 1-OHP and BSA was dominated by strong and weak binding modes alternately.Moreover,1-OHP can bind to tryptophan residues and induce the conformational and microenvironmental changes of BSA,increasing the tryptophan residue of BSA exposuring to a less hydrophobic micro-environment.国家自然科学基金(批准号:21075102;21177102); 中央高校基本科研业务费专项资金(批准号:2013121052); 国家级大学生创新创业项目基金(批准号:DC2013035)资助~

Effects of Eelectrolyte Salt to the SEI Layer of LiCoO_2 Material

研究L iPF6、L iC lO4和L iBF43种电解质对L iCoO2材料界面特性的影响.结果表明:化成后的L iCoO2表面存在固态电解质膜(SEI膜);在不同成分的电解液中,L iCoO2表面SEI膜的形成电位、形貌特征以及材料的可逆容量、平均放电电压和电化学反应阻抗不同.The character of the solid electrolyte interface(SEI layer) on the surface of LiCoO_(2) formed in the electrolytes contained different salt such as LiPF_(6)、LiClO_(4) and LiBF_(4) were studied in this paper.The results showed that the SEI film exists in all three electrolytes after the processes of charge and discharge.The morphological character and the formation voltage of the SEI layer of LiCoO_(2) were different in different electrolytes.The electrochemical performance of the battery such as reversible capacity,average discharge voltage and electrochemical impedance were affected significantly by SEI film formed in different electrolytes.作者联系地址：厦门大学化学化工学院化学系固体表面物理化学国家重点实验室,厦门大学化学化工学院化学系固体表面物理化学国家重点实验室,厦门大学化学化工学院化学系固体表面物理化学国家重点实验室,厦门大学化学化工学院化学系固体表面物理化学国家重点实验室,厦门大学化学化工学院化学系固体表面物理化学国家重点实验室 福建厦门361005,厦大宝龙电池研究所,福建厦门361005,福建厦门361005,厦大宝龙电池研究所,福建厦门361005,福建厦门361005,福建厦门361005,福建厦门361005Author's Address: 1,2,DONG Quan-feng~*1,2,ZHU Ya-wei~1,ZHAN Ya-ding~1,LIN Zu-geng~11.Department of Chemistry and The state Key Laboratory for Physical Chemistry of Solid Surface,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen,Fujian 361005,Fujian,China,2.Xiamen Univ-PowerLong Battery Institute,Xiamen Fujian 361005,Fujian,Chin