埃克森美孚生产新型锂电池隔膜

埃克森美孚化工近日宣布,其关联公司东燃化学株式会社巳开始在商业线上生产用于混合电动车和电动车的创新型微孔膜。该隔膜的设计旨在满足混合电动车和电动车对锂离子电池在安全性、叫靠性和功率     

埃克森美孚推出锂电池微孔隔膜

埃克森美孚化工在日本的关联公司——东燃化学株式会社(TCC)在10月23-28日在日本横滨举办的第22届国际电池、混合动力和燃料电池电动车年会暨展览会上,推出专为混合电动车锂离子电池设计的先进微孔隔膜。这种高性能隔膜可显著提高混合电动车所用锂离子电池的电容量和安     

锂电池电源新型复合隔膜的研制

重要赛事场馆备用电源是保障赛事顺利进行的重要设备,锂电池作为当前电力储备的关键模块,在重大赛事场馆备用电源系统建筑中应用十分广泛。隔膜材料是锂电池的关键部件,关系到电池性能的发挥。因此,本文制备一种锂电池应用的新型复合隔膜,并检测隔膜性能。结果表明：E-Li与有机蒙脱土之间形成了新的化学键,构成了交联结构,相比其他两种隔膜,新型复合隔膜的力学性能有大幅度提升;孔隙率和吸液率得到提升。电化学测试可知,新型复合隔膜能够有效降低的界面阻抗和内阻,0.1C倍率100次循环后仍有较高的容量保留率,且倍率性能优异。     

锂离子电池聚烯烃隔膜安全性能的探讨

锂离子电池的使用安全性广受关注。本文试图从锂离子电池结构、工作原理以及安全问题引发机理方面入手,提出电池安全设计对聚烯烃隔膜的性能需求,并分析探讨了不同聚烯烃隔膜的安全性能。     

住友化学锂电池隔膜产能将扩大2．3倍

住友化学宣布,将增强锂离子电池隔膜的产能。计划2014年秋季之前将大江工厂（日本爱媛县）的产能增至目前的1．9倍,在2015年春季之前增至目前的2．3倍。投资额约为50亿日元。     

锂电池隔膜标准正在修订

正由中国塑料加工工业协会、中国电池工业协会联合主办的2014锂电池、隔膜产业链市场与技术发展研讨会透露,《锂离子电池用聚烯烃隔膜》国家标准已经起草,目前正在进行数据验证与标准修订。该国家标准自2012年开始起草,2013年11月形成了标准送审稿,12月对标准进行了技术审查。目前正根据技术     

远宇集团新型电池隔膜及锂电池项目投产

江苏远宇电子集团常州中科来方能源科技有限公司建设的新型电池隔膜及锂离子动力与储能电池项目近期正式投产。目前,该公司生产的新型锂离子电池隔膜和水性粘合剂属国际首创,已申请日、韩、美三国专利．他们开发的锰系聚合物锂离子动力电池和锂超级电容器等也都极具应用前景。此次在常州实现规模化生产的聚合物锂离子电池．较一般的锂电池具有更高的安全性和更长的寿命,适用于通信、家电、汽车等多个行业。     

化学交联聚酰亚胺隔膜增强锂离子电池性能研究

隔膜作为锂离子电池的重要组成部分,用于阻隔阴极和阳极直接接触,同时为锂离子在电极间的传输提供有效通道。聚酰亚胺隔膜因其具有充放电循环寿命长、机械强度适中、良好的电绝缘性能以及自熄能力等优点,而受到广泛关注。以对苯二甲胺作为交联剂,将聚酰亚胺隔膜进行化学交联,研究了交联时间与隔膜形貌、结构及性能之间的构效关系。随着交联时间的增加,隔膜的孔隙率和吸液率逐渐降低,电解液接触角和机械强度逐渐增大。电化学测试表明,随着交联时间的增加,隔膜的本体阻抗逐渐增大,进而离子电导率逐渐降低,而交联隔膜的界面阻抗均远小于未交联隔膜,且交联隔膜的电化学窗口也均大于未交联隔膜。通过组装半电池测试发现,交联隔膜所组装电池的倍率性能和循环性能均优于未交联隔膜,当交联时间为48 h时,电池性能表现最优,循环100次以后,放电比容量为130.2 mA·h/g,容量保留率为91.1%。     

锂离子电池用隔膜高温性能检测

隔膜的热收缩率是指隔膜加热前后的尺寸变化率,是评价隔膜热性能的重要指标,锂离子电池要求隔膜的受热收缩率小,否则会引起短路,引发电池热失控,因此准确检测隔膜受热收缩率,对隔膜高温性能评价至关重要.     

锂离子电池隔膜研究与发展现状

介绍了锂离子电池隔膜的特性和类型。重点介绍了国内外聚烯烃隔膜的发展现状,通过专利和文献的检索了解到以聚烯烃为原料生产锂离子电池隔膜的发展历史和目前国外对锂离子电池隔膜开展研究较活跃的国家,最后介绍了锂离子电池隔膜的生产技术和国内市场情况,并提出了发展建议。     

Synthesis and electrochemical performance of Li4Ti5O12/Ag composite prepared by electroless plating

To improve the electrochemical and anti flatulence performance of Li₄Ti₅O₁₂, Ag modified Li₄Ti₅O₁₂ (LTO) with high electrochemical performance as anode materials for lithium-ion battery was synthesized successfully by two-step solid phase sintering and subsequent electroless plating process in the presence of silver. The effect of Ag modification on the physical and electrochemical properties were investigated by the extensive material characterization of X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM). The results showed that the samples possessed single spinel structure, it could be observed that the LTO/Ag composite and the pure LTO shared the same vibration frequencies, which indicated that the crystal structure of LTO didn’t change after electroless plating process, and the particles were uniformly and regularly shaped within 0.5–1.0 µm. Electrochemical performance of the samples were evaluated by the charging and discharging, cyclic voltammetry, electrochemical impedance spectroscopy, cycling and rate tests. It's obvious that the LTO/Ag composite prepared at the 10 min of electroless plating showed the highest performance with capacitance of 182.3 mA h/g at 0.2 C current rates. What's more, the LTO/Ag composites still maintained 92% of its initial capacity even after 50 charge/discharge cycles. Modification of appropriate Ag not only benefits the reversible intercalation and deintercalation of Li⁺, but also improves the diffusion coefficient of lithium ion. Besides, modification of appropriate Ag lower electrochemical polarization leads to higher conductivity and cycle performance of LTO, which is consistent with the results of the best reversible capacities.     

中空八面体锂离子电池正极材料LiFePO_4的制备及电化学性能

以醋酸锂、磷酸、七水合硫酸亚铁为原料,聚乙二醇为分散剂,通过一步水热法制备得到中空八面体LiFePO_4锂离子电池正极材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学性能测试仪对样品晶型、形电化学性能进行了表征测试。研究结果表明,在2.5~4.2 V电压范围内,以0.1 C(17 mA/g)倍率进行充放电,样品首次放电比容量为129.6 mA·h/g;0.2、0.5、1、2和5 C的充放电倍率时,首次放电比容量分别达到123.6、119.7、114.1、99.5g和90.6 mA·h/g。10 C的充放电倍率时首次放电比容量为84.3 mA·h/g,说明中空八面体LiFePO_4在高倍率下表现出优异的电化学性能。     

Surfactant-free microwave hydrothermal synthesis of SnO2 nanosheets as an anode material for lithium battery applications

SnO₂ nanosheets were synthesized using microwave hydrothermal method without using a surfactant and organic solvents. Formation of pure nanocrystalline rutile phase of SnO₂ sample was confirmed by X-ray diffraction (XRD) results and the average crystallite size of SnO₂ sample calculated using Scherrer's formula and XRD data is found to be 6 nm. HR-TEM, SAED and EDX results showed the formation of agglomerated nanosize sheets like morphology with high porous structured SnO₂ powder. Further, the formation of high porous structured SnO₂ powder was confirmed from BET surface area results (59.28 m² g^?1). The electrochemical performance of the lithium-ion battery made up of SnO₂ nanosheets, as an anode, was tested through the cyclic voltammetry and galvanostatic charge-discharge measurements. The galvanostatic charge-discharge results of the lithium-ion battery showed good discharge capacity of 257.8 mAh g^?1 after 50 cycles at a current density of 100 mA g^?1. The improved electrochemical properties may be due to the formation of a unique nanosize sheets type morphology with high porous structured SnO₂ powder. High porous structured nanosize sheets type morphology of SnO₂ can help to reduce the diffusion length and sustain the volume changes during the charging-discharging process.Hence, high porous structured nanosize sheets morphology of SnO₂ prepared using the microwave hydrothermal method without using a surfactant and organic solvents can be a better anode material for lithium ion battery applications.     

Performance of lithium-ion cells with a γ-ray radiated electrolyte

Lithium-ion cells are potential energy storage devices in planetary exploration due to their high energy density and long lifespan. The high intensity of γ-ray radiation in outer space poses a great challenge to lithium-ion cells. In this study, radioactive Co-60 was applied as the radiation source to investigate the performance of lithium-ion cells with the electrolyte radiated by γ-rays. Two kinds of cathode (LiMn₂O₄, LiNi_0.8Co_0.15Al_0.05O₂) and three kinds of anode (Li, graphite, Li₄Ti₅O₁₂) were examined. There are two new mechanisms in the cells with a radiated electrolyte which affect the cell voltage and cycling performance: (i) erosion of the lithium electrode in the radiated electrolyte in the cases of half cells and lithium symmetrical cells; and (ii) electrochemical reaction between carboxyl species and the lithium extracted from the cathode in the case of full cells.     

Electrochemical performance of carbon-coated Li3V2(PO4)3 cathode materials derived from polystyrene-based carbon-thermal reduction synthesis

Li₃V₂(PO₄)₃ cathode materials were synthesized by a simple carbon-thermal reduction method using polystyrene as a carbon source. The residual carbon produced by the pyrolysis of polystyrene produced fine particle sizes and uniform carbon distribution on the Li₃V₂(PO₄)₃ particle surface. By increasing the amount of polystyrene added in the range of 0-16 wt.%, the thickness of the carbon coating increased, and the coating thickness was found to influence the electrochemical performance of the Li₃V₂(PO₄)₃ significantly. Our results indicate that the 6 wt.% polystyrene added Li₃V₂(PO₄)₃ with a 0.5-1 nm thick carbon coating possesses the highest initial discharge capacity of 132.7 mAh g⁻¹ between 3.0 and 4.3 V at 0.1 C. However, at high current densities, the higher polystyrene added Li₃V₂(PO₄)₃/C with a thicker carbon coating shows better performance in terms of the discharge capacity and cycling stability than that with the thin carbon coating. The improved cycling performance at higher current densities is attributed to the relatively small particle size and the suppressed impedance increase because of the thicker carbon coating.     

LiFePO4/(C+Cu) composite with excellent cycling stability as lithium ion battery cathodes synthesized via a modified carbothermal reduction method

In order to improve the electronic conductivity of lithium iron phosphate (LiFePO₄), copper was added to modify LiFePO₄/C composite as cathode material for lithium-ion battery, which was successfully synthesized via a modified carbothermal reduction method using a low cost Fe³⁺ salt (Fe (NO₃)₃) as iron source. The morphology, particle size and electrochemical performances of olivine LiFePO₄ modified with carbon and copper were systematically investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and galvanostatics tests. The results show that the prepared composites were irregularity sphere with size of 100–200?nm, which were relatively even-distributed copper particles coated with a 3?nm carbon layer. The as-prepared composites exhibit an initial discharge capacity of 160.7?mA?h?g^-1 at current density of 0.1?C-rate, the capacity retention ratio is 98.6% at 0.5?C-rate after 200 cycles, and 96% at 5?C-rate after 500 cycles, respectively. The impedance tests reveal that the addition of copper further reduces the electric resistance of LiFePO₄/C. The well-designed synthesis method is hopeful to be applied to prepare other electrode materials of LIBs.     

非织造布在电池隔膜上的应用

湿法、熔喷法非织造布是锂离子电池隔膜的重要材料。简要阐述了用于电池隔膜的非织造布材料的技术特征,并着重介绍了聚合物纳米纤维、原纤化纳米纤维以及高性能纤维材料在电池隔膜材料中的研究及应用现状。