软包装锂离子电池性能研究

研究了以塑料包装取代金属外壳所实现的新型软包装锂离子电池的电化学性能.从软包装锂离子电池的倍率放电性能、电池的高低温放电能力和充放电循环稳定性等方面的研究表明,软包装锂离子电池具有良好电化学性能.软包装锂离子电池既不同于金属外壳锂离子电池,也不同于聚合物锂离子电池,是锂离子电池的一种新型设计.     

低温环境对动力锂电池放电特性影响

针对锂离子电池在新能源汽车上的应用前景及其低温条件下的性能限制,尝试对锂离子电池在低温条件下进行放电实验,探讨其在低温条件下的放电性能.本文利用烤燃设备对5Ah锂离子电池充电、放电,通过示波器记录其端电压,观察低温时锂离子电池端电压的变化情况.实验后,静置24小时,测量锂离子电池电压恢复情况.然后对实验数据进行整理分析,通过取点绘制曲线,分别比较0.5C、1.0C放电电流情况下和-20~20℃各温度下锂离子电池的放电性能.综合分析可知,随着温度的降低,锂离子电池的放电性能变差;随着放电倍率的提高,电池的放电容量逐渐减小.     

用于锂离子电池热安全保护的正温度系数材料

研制了一种新型的正温度系数(PTC)材料取代锂离子电池用导电剂,利用其高温下的金属-绝缘体相变导致的电导率变化对锂离子电池进行高温保护.通过对比,研究了高温下常规锂离子电池和加入PTC材料的锂离子电池的抗高温性能以及PTC材料在电池中的电阻温度变化效应.结果表明,温度高于80 ℃时该PTC材料在电池中的PTC效应非常显著,有效地改善了锂离子电池的热安全性.     

锂离子动力电池充放电特性的试验研究

为了解锂离子动力电池的工作特性,评价其在电动车辆上的使用性能,对锂离子动力电池进行了性能测试.基于实验结果,给出了锂离子动力电池的工作电压、工作电压下降速率和温升特性曲线.对锂离子动力电池的工作特性进行了分析;对各单体电池间的一致性对电池组性能和寿命的影响进行了分析评价;对电池的使用规范提出了建议.分析表明:锂离子动力电池适合于电动车辆使用,但电池单体间的一致性还待进一步改善和提高.     

锂离子电池SEI成膜添加剂的研究

开发高效优质的固体电解质界面(SEI)成膜添加剂是提高锂离子电池性能的一种经济而有效的途径.本文从SEI成膜添加剂成膜机理的角度,分析和评价了已有的还原型添加剂、反应型添加剂及修饰型添加剂的作用效果;综述了理论计算在锂离子电池SEI成膜添加剂研究中的应用,并提出了"理论设计、材料合成、性能评估"三个研究环节无缝连接锂离子电池中SEI成膜添加剂创新研发的新思路.     

基于植酸钠热分解制备新能源电池碳基负极材料

通过控制温度在750℃和950℃煅烧植酸钠,制备两种结构和性质不同的碳材料作为锂离子电池和钠离子电池的负极材料.通过对两种材料在负极材料应用中的性能对比,判断材料的适用对象.结果表明,750℃下的碳材料作为锂离子电池负极时的性能更好,而950℃下的碳材料则更适合作为钠离子电池负极材料,展现了植酸钠制备的碳材料具有作为锂离子电池和钠离子电池双功能负极材料的潜力.     

基于ECTLBO-ELM模型的荷电状态估计

电池的荷电状态(SOC)表示电池的可用容量,是电池管理系统重要参数之一.以锂离子电池为例,准确的估计可以提高其性能.为了建立锂离子电池的精确计算模型,提出了一种基于增强混沌教与学优化算法(ECTLBO)优化极限学习机(ELM)的SOC估计模型(ECTLBO-ELM).在ECTLBO-ELM模型中,一是利用增强混沌优化策...     

锂离子动力电池特性研究

为深入了解锂离子动力电池的充放电特性,评价其在电动汽车上的使用性能,通过不同条件下的试验对两种锂离子动力电池进行了全面性能测试.介绍了动力电池性能试验方法,基于试验数据绘制了锂离子动力电池不同使用工况下的充放电特性曲线,得到了电池的各项性能参数.分析了锂离子动力电池的工作特性以及充放电率、环境温度等因素对电池性能的影响,提出了锂离子动力电池的合理使用建议和在低温情况下的合理应用方案.     

改进Elman网络在锂离子电池容量预测中的应用

为了准确估算锂离子电池的荷电状态(SOC),在分析影响锂离子电池剩余容量时变特性的基础上,综合国内外几种常用的预测锂离子电池方法,将改进Elman网络应用到锂离子电池的容量预测和模型建立中。实验结果表明:该网络不仅局部泛化能力好,而且有较好的动态性能和逼近能力,能够满足电池容量预测的误差要求。     

一种新型聚合物锂离子电池的制备和性能研究

采用一种新颖简单的方式处理负极片,并在其表面形成一层厚度均匀、孔隙丰富的聚合物膜。以此聚合物膜作为锂离子电池的隔膜组装聚合物锂离子电池并测试电池的电化学性能。性能测试显示聚合物锂离子电池性能优越,表明该方法可用于聚合物锂离子电池的工业化生产。     

电动汽车用锰酸锂与磷酸铁锂动力电池性能比较分析

尖晶石锰酸锂和橄榄石磷酸铁锂离子电池是当前电动汽车用动力电池的主体,采用实验比较研究的方法,对比了两种动力电池正极材料电化学特性,研究了两种材料制备成动力电池的能量密度、功率密度、温度特性、循环寿命以及应用特性.结果表明:除低温性能和功率密度外,磷酸铁锂动力电池在其他方面的性能均优于锰酸锂动力电池.     

Nanostructured TiO2（B）:the effect of size and shape on anode properties for Li-ion batteries

Reducing the dimensions of electrode materials from the micron to the nanoscale can have a profound influence on their properties and hence on the performance of electrochemical devices,e.g.Li-ion batteries,that employ such electrodes.TiO2(B) has received growing interest as a possible anode for Li-ion batteries in recent years.It offers the possibility of higher energy storage compared with the commercialized Li4Ti5O12.Bulk,nanowire,nanotube,and nanoparticle morphologies have been prepared and studied.However,to date these materials have not be compared in one article.In the current review we first summarize the different synthesis methods for the preparation of nanostructured TiO2(B);then present the effects of size and shape on the electrochemical properties.Finally TiO2(B) with nanometer dimensions exhibit a higher capacity to store Li,regardless of rate,due to structural distortions inherent at the nanoscale.     

Practical development and challenges of garnet-structured Li7La3Zr2O12 electrolytes for all-solid-state lithium-ion batteries: A review

All-solid-state Li-ion batteries (ASSLIBs) have been widely studied to achieve Li-ion batteries (LIBs) with high safety and energy density. Recent reviews and experimental papers have focused on methods that improve the ionic conductivity, stabilize the electrochemical performance, and enhance the electrolyte/electrode interfacial compatibility of several solid-state electrolytes (SSEs), including oxides, sulf-ides, composite and gel electrolytes, and so on. Garnet-structured Li7La3Zr2O12 (LLZO) is highly regarded an SSE with excellent application potential. However, this type of electrolyte also possesses a number of disadvantages, such as low ionic conductivity, unstable cubic phase, and poor interfacial compatibility with anodes/cathodes. The benefits of LLZO have urged many researchers to explore effective solutions to over-come its inherent limitations. Herein, we review recent developments on garnet-structured LLZO and provide comprehensive insights to guide the development of garnet-structured LLZO-type electrolytes. We not only systematically and comprehensively discuss the preparation, ele-ment doping, structure, stability, and interfacial improvement of LLZOs but also provide future perspectives for these materials. This review expands the current understanding on advanced solid garnet electrolytes and provides meaningful guidance for the commercialization of ASSLIBs.     

尖晶石锰酸锂动力电池性能及应用

100Ah动力电池采用尖晶石锰酸锂作为正极材料,400Ah电池组应用于纯电动车,实验表明电池具有良好的电化学性能和安全性能。     

Development and application of phase diagrams for Li-ion batteries using CALPHAD approach

Phase diagrams provide fundamental knowledge about design map of new electrode materials for Li-ion batteries. The CALPHAD (CALculation of PHAse Diagrams) approach is widely applied to the development of phase diagrams and property diagrams in a thermodynamic language. Within the CALPHAD framework, the theoretical modeling can be performed to predict phase equilibria, thermodynamics, electrochemical and physical properties of electrodes. This review provides the successful application of high quality calculated phase diagrams and thermodynamic property diagrams in CALPHAD investigation to both cathodes and anodes of Li-ion batteries, including Li–Co–O, Li–Ni–O, Li–Co–Ni–O, Li–Mn–O, Li–Cu–O, Li–Si, Li–Sb and Li–Sn systems with. The intensive CALPHAD-type research may also predict electrochemical properties, cell performance of the Li-ion batteries to achieve more efficient development of electrode materials.     

Safety characteristics of Li-ion batteries evaluated by in situ measurement techniques

Li-ion batteries hold an important place in the field of high power batteries because of their high open circuit voltage and associated high energy density. However, the safety is less satisfactory; therefore, the study of the factors that affect the safety of Li-ion batteries has much meaning to the safety design. In this paper, a set of apparatus was developed for in situ measurements, and several commercial materials including electrolyte, separator and electrode materials for Li-ion batteries were investigated by the in situ method. The results showed： 1） The electrolyte vapor pressure is influenced significantly by the component with low boiling point and increases rapidly with the increasing of temperature; 2） the shutdown of separator occurs at around 135℃ and the impedance increases approximately by two orders of magnitude; 3） carbon anode materials affect the most the volume changes of the cell, and the change for a graphite anode is much greater than that of a glassy carbon anode.     

电动汽车动力电池技术研究进展

 从锂离子电池材料技术、单体电池、电池系统等几个方面对锂离子动力电池的发展进行了评述。锰酸锂一般应用于轻型电动车辆,也可与三元材料混合提升新能源车辆用电池的安全性和倍率性能;磷酸铁锂适用于中等比能量要求的动力电池;三元材料通过材料、隔膜涂层和电池技术的改进提升安全性后适用于高比能量型电池;石墨负极目前仍然是广泛应用的负极材料,在碳负极材料中添加硅等高容量材料的努力仍在进行中,液体电解液在向高电压和宽工作温区方向发展;小圆柱电池、方形金属壳电池和软包电池各有特点,适应了多元化的电动汽车应用需求,国产制造设备技术水平持续提升,电池系统技术方面需要整车和电池方面合作努力以提升安全性和可靠性。锂离子动力电池是目前最具实用价值的动力电池,预期其比能量在不久的将来可提升至300 (W·h)/kg,满足新能源汽车产业未来10年的发展需求。     

尖晶石锰酸锂动力电池性能及应用

100Ah动力电池采用尖晶石锰酸锂作为正极材料,400Ah电池组应用于纯电动车,实验表明电池具有良好的电化学性能和安全性能。     

Effect of Polyaniline on Electrochemical Performance of LiFePO_4

1 Introduction LiFePO4 has received much attention as a kind of next-generation cathode materials for lithium ion batteries. To improve its electrochemical performance, researchers have been working to overcome two major disadvantages of LiFePO4 such as the low electrical conductivity and the small Li-ion diffusivity. The latter can be solved by reducing the particle size while the former can be improved by coating a layer of carbon on the surface of LiFePO4 particles[1]. More researchers have carried o...     

Low temperature synthesis of NiO/Co3O4 composite nanosheets as high performance Li-ion battery anode materials

NiO/Co3O4 composite nanosheets have been synthesized via a facile method at low temperature for the first time.The as prepared materials were characterized by X-ray powder diffraction(XRD) and transmission electron microscopy(TEM),and the performance of Li-ion batteries(LIBs) as anode materials were also studied.By controlling the atom ratio of Ni:Co,not only the size of the nanosheets can be controlled,the electrode’s conductivity and stability could also be greatly improved.The composite material showed a stable capacity retention during cycling(87% of the second capacity was retained after 15 cycles) even at a relatively large current rate(400 mA/g).The NiO/Co3O4 nanosheet might be promising candidate anode materials in high performance Li-ion batteries.