硼基锂盐电解质在锂离子电池中的应用

电解质材料是锂离子电池的关键材料之一,它直接影响电池的性能.新型硼酸锂盐由于种类繁多且环境友好而越来越引起人们的重视.双草酸硼酸锂(LiBOB)是一种新型的锂盐,具有很好的成膜性能和热稳定性,是一种很有潜力替代现有商品化锂盐LiPF6的物质.本文介绍了近期新型硼基锂盐的发展状况,归纳了LiBOB基电解质的研究概况,综述...     

锂离子电池LiBOB电解质盐研究

本文介绍了可用于锂离子电池的新型锂盐--双乙二酸硼酸锂(LiBOB)的基本性质,包括结构组成、合成方法、物理化学性能及其与结构的关系.综述了近年来在LiBOB新型电解质锂盐研究与探索方面的新成果,重点评价了BOB-阴离子对于石墨负极和金属氧化物正极材料表面的电化学性能.讨论了这种盐在锂离子系统中杂质和安全性等问题,归纳了其优缺点,指出今后电解质锂盐的研究发展方向.     

锂离子电池LiBOB电解质盐研究进展

本文介绍了可用于锂离子电池的新型锂盐--双乙二酸硼酸锂（LiBOB）的基本性质,包括结构组成、合成方法、物理化学性能及其与结构的关系。综述了近年来在LiBOB新型电解质锂盐研究与探索方面的新成果,重点评价了BOB-阴离子对于石墨负极和金属氧化物正极材料表面的电化学性能。讨论了这种盐在锂离子系中杂质和安全性等问题,归纳了其优缺点,指出今后电解质锂盐的研究发展方向。     

以γ-丁内酯为溶剂的LiBOB基电解液性能的研究

双乙二酸硼酸锂（LiBOB）被认为是一种很有潜力代替LiPF6应用在锂离子电池中的新型电解质锂盐，它不仅满足了电解质对锂盐的基本要求，而且具有良好的成膜性能和热稳定性，是近年来受到人们广泛关注的新型锂盐之一。     

锂离子电池电解质的新型锂盐——双乙二酸硼酸锂

介绍了一种新型锂盐--双乙二酸硼酸锂(LiBOB)的基本性质及制备进展,并重点综述了其在锂电中应用的有关研究,包括基于LiBOB电解液的导电性研究,对负极材料、正极材料的稳定性研究,与其他锂盐在锂离子电池中混合使用的性能研究等.     

锂离子电池电解质的新型锂盐――双乙二酸硼酸锂

介绍了一种新型锂盐――双乙二酸硼酸锂(LiBOB)的基本性质及制备进展,并重点综述了其在锂电中应用的有关研究,包括基于LiBOB电解液的导电性研究,对负极材料、正极材料的稳定性研究,与其他锂盐在锂离子电池中混合使用的性能研究等。     

以γ-丁内酯为溶剂的LiBOB基电解液性能的研究

双乙二酸硼酸锂(LiBOB)被认为是一种很有潜力代替LiPF6应用在锂离子电池中的新型电解质锂盐,它不仅满足了电解质对锂盐的基本要求,而且具有良好的成膜性能和热稳定性,是近年来受到人们广泛关注的新型锂盐之一.     

锂硫电池电解质研究进展

锂硫电池由于其高能量密度(理论高达2600 Wh/kg)、低成本、环境友好等优点而广受关注. 但是锂硫电池仍存在正极活性物质利用率低、循环性能差等问题. 造成这些问题的主要原因是易溶于有机电解液的中间产物聚硫锂Li₂S_n (4≤n≤8)和不溶于有机电解液的硫化锂造成的. 简要介绍了锂硫电池体系的主要问题,并结合本研究小组的研究,对锂硫电池用电解质体系从有机电解液组成、电解液添加剂、聚合物电解质和无机固体电解质等方面进行了详细的综述,最后对电解质的发展前景进行了展望.     

锂空气电池非水基电解液的优化与研究进展

锂空气电池是介于燃料电池和锂电池之间的一种新一代高性能绿色二次电池, 其理论比能量高达11140 Wh/kg (Li), 是锂离子电池的6～9倍, 同时具有输出电压稳定、环境友好等优点, 应用前景广阔. 电解液是电池中重要的组成部分, 在决定电池的电化学性能方面起着至关重要的作用. 综述了锂空气电池中有机电解液、离子液体和固态电解质等三种非水基电解质的研究进展, 系统阐述了各电解液不同化学性质(电化学稳定性、离子导电率、极性)、物理性质(如介电常数、黏度、氧气溶解度、吸湿性)和物理化学性质(对阴极材料的浸润能力等)对锂空气电池放电比容量、大电流放电能力和循环性能的影响, 并对其未来的发展方向进行了展望.     

全固态锂金属电池表界面化学的研究进展

传统的锂金属电池存在电解液易泄漏、 易燃等安全隐患, 因此开发不燃性全固态电解质对于解决锂金属电池安全问题至关重要, 而如何有效降低固体电解质与电极之间的界面电阻是发展高性能全固态锂金属电池的关键. 针对如何优化全固态锂金属电池表界面的问题, 本文综述了全固态锂金属电池电极和电解质表面修饰的最新研究进展, 对提高界面接触和降低界面电阻的传统方法进行了探讨, 分析并点评了新型的表面修饰技术, 为进一步提高全固态锂金属电池的综合性能提供新思路. 最后, 对全固态锂金属电池的研究前景进行了展望.     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.