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。     

锂离子电池隔膜技术研究进展

本文介绍了锂离子电池隔膜材料的作用及性能、研究与发展现状和技术领域的热点问题。探讨了隔膜的生产技术,重点介绍了微孔聚烯烃隔膜、改性聚烯烃隔膜、无纺布隔膜、涂层复合膜、纳米纤维膜和固体电解质膜,并展望了电池隔膜的未来发展方向。     

微孔碳材料修饰的隔膜用于高性能锂硫电池

锂硫电池具有较高的能量密度,是有发展前景的能量存储体系之一。但“穿梭效应”严重制约了锂硫电池的实际应用,为解决该问题,本文通过简单的一步热解法合成了孔径均匀的微孔碳材料,探究了微孔碳材料修饰隔膜后对锂硫电池性能的影响。结果表明,制备的微孔碳材料孔径集中在0.56nm左右,修饰隔膜后不仅能够有效抑制“穿梭效应”的产生,还有利于加快锂离子的传输,确保正极一侧溶解的多硫化物的再次利用。在0.1C的电流密度下,采用微孔碳材料修饰隔膜的电池首次放电比容量为1359mAh/g,循环100次之后容量能保持在966mAh/g,而修饰之前的传统聚丙烯隔膜,循环100次之后的比容量仅为409mAh/g;在1C的电流密度下循环500圈后,采用微孔碳材料修饰隔膜的电池容量保持率为88%,表现出优异的循环稳定性。     

Inorganic ceramic fiber separator for electrochemical and safety performance improvement of lithium-ion batteries

A separator based on ceramic fibers with excellent properties, utilized for powerful laminated lithium ion batteries, was prepared by low-cost production process. Physical and chemical characteristics of the separator and the electrochemical as well as the safety performance of lithium ion batteries were extensively investigated, and compared to commercialized polyethylene (PE) and ceramic-coating PE (C-PE) separators. The results demonstrated that inorganic ceramic fiber (CF) membrane exhibited higher porosity (85%), higher electrolyte uptake (381%) and higher ionic conductivity (1.48 mS/cm). Moreover, CF separator did not display thermal shrinkage at 160 °C for 1 h, manifesting that the separator possession of high thermal stability. The lithium nickel cobalt manganese oxide LiNi_0.5Co_0.2Mn_0.3O₂/ graphite battery employing the CF membrane displayed superior rate capability, which delivered the discharge capacities of 13.206 A h (0.2 C), 12.729 A h (0.5 C), and 12.074 A h (1 C), respectively. In addition, this battery improved cycle stability, with the capacity retention of 101.4% following 100 cycles at 1 C rate. Results of safety tests presented that batteries with CF separator passed both nail penetration and extrusion tests, implying that the safety performance was remarkably improved. Additionally, CF membrane had only 20 cents in cost for 1 Ah cells, which was ten times lower than commercial PE and C-PE separators. The perfect combination of good properties and low cost made it possible for the CF separator to be a promising separator for laminated lithium-ion batteries, which are especially used in electric vehicles.     

锂离子电池隔膜材料研究进展

近年来,锂离子电池技术发展迅速,隔膜作为电池中的核心材料之一,决定着锂离子电池的性能,因此隔膜材料及制备技术亟需被深入研究。目前,商业化的锂电池隔膜以聚烯烃隔膜为主,制备工艺正从干法向湿法过渡,但是近几年已经发展出了不同材料体系、不同制备工艺的隔膜。本文简要介绍了聚烯烃隔膜生产技术,重点综述了非织造隔膜材料、涂层以及新型隔膜制备技术的研究成果,并展望了锂电池隔膜的发展方向。     

聚丙烯腈/聚酯无纺布微孔复合锂电隔膜的制备及性能

为了改善锂电隔膜的耐热性、电解液亲和性和机械性能,本文以聚丙烯腈为主要材料,采用相转化法制备了聚酯无纺布支撑的聚丙烯腈微孔复合锂电隔膜,对隔膜的理化性能（孔道结构、机械性能、电解液性能和耐热性）和电池性能（循环性能、倍率性能）进行系统研究。结果表明,复合隔膜具有均匀的微孔结构,平均孔径约为425nm,孔隙率为74%,拉伸强度为30MPa;电解液亲和性良好,吸液率为385%,接触角接近0°,锂离子电导率较市售隔膜显著提高,达到1.65mS/cm;在150℃、0.5h的热处理条件下,复合隔膜的热收缩率为0。鉴于良好的理化特性,该隔膜所装配的钴酸锂/锂金属电池表现出优异的循环容量和倍率容量保持性,如在0.2C倍率下,经历200次循环后电池的放电容量保持率为95.2%,在10C倍率下电池的放电容量为0.5C倍率下的58.3%。因此,相转化法制备的聚丙烯腈基微孔复合隔膜在锂离子电池中显示出较好的应用前景。     

The effects of Ni and Li doping on the performance of lithium manganese oxide material for lithium secondary batteries

Layered Li_0.7[M_1/6Mn_5/6]O₂ (M=Li, Ni) was synthesized using a sol-gel method. P2-Na_0.7[M_1/6Mn_5/6]O₂ precursor was first synthesized by a sol-gel method, and then O2-Li_0.7[M_1/6Mn_5/6]O₂ was prepared by an ion exchange of Li for Na in P2-Na_0.7[M_1/6Mn_5/6]O₂ precursor. From charge/discharge curves, it was seen that Li_0.7[Li_1/6Mn_5/6]O₂ has two plateaus similar to those observed from a spinel structure, but Li_0.7[Ni_1/6Mn_5/6]O₂ holds a single plateau as observed from a typical layered structure. It was considered that Li_0.7[Li_1/6Mn_5/6]O₂ undergoes a phase transformation from layered to spinel structure during the charge/discharge cycle, but Li_0.7[Ni_1/6Mn_5/6]O₂ maintains O2-layered structure after the cycles. Li_0.7[Ni_1/6Mn_5/6]O₂ was higher in discharge capacity and retention rate than Li_0.7[Li_1/6Mn_5/6]O₂.     

A poly(ethylene terephthalate) nonwoven sandwiched electrospun polysulfonamide fibrous separator for rechargeable lithium ion batteries

A poly(ethylene terephthalate) nonwoven sandwiched electrospun polysulfonamide (PSA) fibrous separator was developed for application in lithium‐ion batteries (LIBs). The poly(ethylene terephthalate) nonwoven served as a mechanical support and the PSA layers provided the separators with nanoporous structures. This novel composite separator possessed better thermal stability and electrolyte wettability than commercial polypropylene separator and the sandwiched nonwoven endowed the separator with an improved mechanical strength (17.7 MPa) compared to the pure electrospun PSA separator. The cells assembled with this composite separator displayed excellent discharge capacity (122.0 mAh g^?1 after 100 cycles) and discharge C‐rate capacity. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44907.     

Effect of niobium doping on the structure and electrochemical performance of LiNi0.5Co0.2Mn0.3O2 cathode materials for lithium ion batteries

Key issues including poor rate capability and limited cycle life span should be addressed for the extended application of LiNi_0.5Co_0.2Mn_0.3O₂ cathode. The suppressed Li⁺/Ni²⁺ site exchange, enlarged LiO₂ inter-slab space and reduced impedance, which could facilitate the structure stability, were achieved by controlled Niobium (Nb) doping and contributed to enhanced performance even at elevated temperature (55 °C). The detailed role of the doped Nb was investigated thoroughly and systematically with the help of XRD, SEM, XPS and related electrochemical tests. The full and accurate results demonstrate that the Li(Ni_0.5Co_0.2Mn_0.3)_0.99Nb_0.01O₂ sample with appropriate Nb doping amount possess high capacity retention of 93.77% after 100 cycles at 1.0 C and improved rate performance with 125.5 mA h g⁻¹ at 5.0 C, which are much better than that of the LiNi_0.5Co_0.2Mn_0.3O₂. Moreover, at high temperature of 55 °C, Nb doping shows more remarkable effect on stabilizing the structure and 88.63% of the initial reversible capacity could be retained, which is ~20% higher than the LiNi_0.5Co_0.2Mn_0.3O₂. This study intensively determines that controlled Nb doping could be effectively maintain the structure stability of advanced LiNi_0.5Co_0.2Mn_0.3O₂ cathode and promote the development of high energy density lithium ion batteries.     

石墨烯/硅负极材料的制备及其电化学性能的研究

通过将亚微米硅与石墨烯进行原位还原复合(SG1)和机械混合(SG2)这2种方式制备了不同的石墨烯/硅复合锂离子电池负极材料。SEM结果显示,2种复合物中硅颗粒都被石墨烯片层所包夹,且分散均匀;充放电测试表明,这2种复合方式均使复合电极的首次容量损失大大减小,循环稳定性得到很大提高,其首次放电比容量分别为2 070.5mAh/g和1 534.2mAh/g,循环12次后均保持在1 000mAh/g以上;通过EIS阻抗谱对硅复合电极的导电性以及电极结构的初步研究,发现复合电极本身导电性以及材料的电接触性远优于纯硅,电极结构也相对稳定。     

海上石油平台油水分离罐的清洗

叙述了原油油泥的组成、成因及其清洗过程中的危险性和安全对策,介绍了ＨＺ２６－１海上石油平台油水分离罐的清洗方法和清洗步骤     

A phase inversion based sponge-like polysulfonamide/SiO2 composite separator for high performance lithium-ion batteries

In this work,a sponge-like polysulfonamide(PSA)/SiO_2 composite membrane is unprecedentedly prepared by the phase inversion method,and successfully demonstrated as a novel separator of lithium-ion batteries(LIBs).Compared to the commercial polypropylene(PP) separator,the sponge-like PSA/SiO_2 composite possesses better physical and electrochemical properties,such as higher porosity,ionic conductivity,thermal stability and flame retarding ability.The LiCoO_2/Li half-cells using the sponge-like composite separator demonstrate superior rate capability and cyclability over those using the commercial PP separator.Moreover,the sponge-like composite separator can ensure the normal operation of LiCoO_2/Li half-cell at an extremely high temperature of 90 °C,while the commercial PP separator cannot.All these encouraging results suggest that this phase inversion based sponge-like PSA/SiO_2 composite separator is really a promising separator for high performance LIBs.