LiBOB-PC/DEC电解液性质研究

合成锂离子电池新型电解质锂盐L iBOB,并与PC/DEC溶剂配成电解液.室温下研究了L iBOB-PC/DEC电解液电导率随锂盐浓度的变化规律及其用于L i/ARG电池充放电循环性能的最佳组成配比,为0.5mol.L-1L iBOB-PC/DEC(3∶7).应用交流阻抗和循环伏安法研究了该最佳电解液的电化学性质及其电极/界面状态,结果显示,石墨电极在这种电解液中可形成良好的SEI膜.     

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。     

锂离子电池有机电解液成膜添加剂研究进展

综述了锂离子电池有机电解液成膜添加剂的作用原理，从气体、液体、固体成膜添加剂三个方面综述了目前成膜添加剂的研究现状。重点论述了每一种添加剂的作用原理以及在碳负极上的还原机理，同时对它们的优缺点也作了适当的评述。     

锂离子电池电解液的研究进展(英文)

综述现今锂离子电池电解液的研究进展 .评估了电解液中锂盐、溶剂、填加剂以及杂质等对电解液的电导、固体电解质相界面 (SEI)的形成、电池循环寿命等的影响     

锂离子电池电解液低温导电性能的研究

本文研究了用于锂电池的LiPF6＿乙烯碳酸酯(EC)＿甲基乙酸酯(MA)电解液体系,测定了该体系在不同的溶剂配比和盐浓度下于20℃～-50℃时的电导率,给出该体系性能最佳的溶剂配比和盐浓度,以此进行循环伏安和充放电测试,并与商用电解液(LiPF6 EC 二乙基碳酸酯(DEC)进行了比较.     

纳米硅在含添加剂的高浓度电解液中循环特征及其表面协同成膜的研究

本文研究了在LiFSI-(PC)₃高浓度电解液中添加剂对于纳米硅材料的循环性能的影响,采用扫描电子显微镜、傅里叶变换红外光谱和X-射线光电子能谱分析了循环过程纳米硅材料及其电极的结构和表面SEI膜演化的特征. 结果表明,添加剂能够改善纳米硅材料的循环性能,在LiFSI-(PC)₃高浓度电解液中循环300周材料比容量为574.8 mAh·g^-1,而含有3%LiDFOB、3%FEC、3%TMSB的添加剂的高浓度电解液中,比容量分别为1142.9、1863.6和1852.2 mAh·g^-1. 作者分析认为,在LiFSI-(PC)₃浓溶液中LiFSI优先于PC在纳米硅表面发生成膜反应,形成的SEI膜由以无机物主导的内层膜和以有机物主导的外层膜组成,而在含添加剂的高浓度电解液中,添加剂和LiFSI协同参与SEI成膜反应,形成的内层膜能够减缓PC溶剂参与外层的成膜反应,由此形成的SEI膜能够抑制循环过程中SEI膜的过度生长,更好地抑制了纳米硅的粉化,纳米硅材料及其电极结构稳定性更好,材料表现出更好的循环性能.     

高电压锂离子电池用环丁砜基高浓度电解液

本文介绍了一种含双(三氟甲烷磺酰)亚胺锂(Li TFSI)和环丁砜(TMS)的高浓度电解液。采用FT-IR对样品进行结构表征,通过线性扫描伏安法(LSV)和循环伏安法(CV)研究电解液的电化学性能。结果表明,高浓度TMS/Li TFSI(摩尔比2∶1)电解液的电化学和化学稳定性良好,电化学窗口拓宽至5. 02V,可以有效抑制Al箔腐蚀,适用于5V级的镍锰酸锂(Li Ni_(0.5)Mn1. 5O4)正极材料。室温下,基于TMS/Li TFSI高浓度电解液的Li Ni_(0.5)Mn1. 5O4半电池经过大倍率充放电后,0. 1C的比容量基本回复到原始状态;在0. 2C的倍率下实现良好的循环,前25圈的库仑效率大于92%。     

腈基功能化有机硅基电解液在4.4V钴酸锂/石墨锂离子电池中的性能研究

研究了3-丙基腈-甲氧基乙氧基-二甲基硅烷(SN1)作为电解液共溶剂对高电压钴酸锂/石墨全电池电化学性能的影响.在商业烷基碳酸酯电解液里掺入30%SN1(体积分数),钴酸锂/石墨全电池在4.4 V截止电压下仍表现出良好的循环稳定性和倍率性能:以0.5 C充放电,首次放电比容量为154 mA h/g,循环150周后,容量保持率为92.9%;当放电倍率增加到1和1.5 C时,放电容量分别为143和133 mA h/g.电化学阻抗谱、扫描电镜和傅里叶红外光谱的结果表明,耐高电压腈基功能化有机硅化合物的引入有效抑制了共溶剂电解液在正极材料表面的分解,压制了循环过程中电极极化的增长,为电极/电解液界面的Li+扩散和电荷转移提供了有利的动力学条件.     

白藜芦醇对长期贮存锂离子电池电解液性能的影响

锂离子电池电解液从制造完成到使用,一般都会经历灌装、运输和贮存的过程,了解长期贮存过程对锂离子电池电解液性能的影响,对锂离子电池的生产具有一定的理论指导意义.本文运用电化学阻抗谱(EIS)测试并结合循环伏安法(CV)测试、充放电测试、扫描电子显微镜(SEM)等研究了1 mol.L-1 LiPF6-EC:EMC 基础电解...     

新型成膜电解液添加剂亚硫酸丁烯酯的电化学行为

合成制备了一种新的环状亚硫酸酯类有机溶剂——亚硫酸丁烯酯(BS). 量子化学计算结果表明, 亚硫酸丁烯酯有机溶剂分子的总能、LUMO值比碳酸丙烯酯有机溶剂的低, 具有较强的得电子能力, 不易被氧化. 其作为添加剂与碳酸丙烯酯(PC)混合应用于锂离子电池中, 可有效地抑制PC在石墨电极中的共插入, 能显著改善循环性能.     

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.     

Lithium Bis(oxalate)borate Additive for Self-repairing Zincophilic Solid Electrolyte Interphases towards Ultrahigh-rate and Ultra-stable Zinc Anodes

The artificial solid electrolyte interphase (SEI) plays a pivotal role in Zn anode stabilization but its long-term effectiveness at high rates is still challenged. Herein, to achieve superior long-life and high-rate Zn anode, an exquisite electrolyte additive, lithium bis(oxalate)borate (LiBOB), is proposed to in situ derive a highly Zn²⁺-conductive SEI and to dynamically patrol its cycling-initiated defects. Profiting from the as-constructed real-time, automatic SEI repairing mechanism, the Zn anode can be cycled with distinct reversibility over 1800 h at an ultrahigh current density of 50 mA cm⁻², presenting a record-high cumulative capacity up to 45 Ah cm⁻². The superiority of the formulated electrolyte is further demonstrated in the Zn||MnO₂ and Zn||NaV₃O₈ full batteries, even when tested under harsh conditions (limited Zn supply (N/P≈3), 2500 cycles). This work brings inspiration for developing fast-charging Zn batteries toward grid-scale storage of renewable energy sources.     

YSZ电解质薄膜的制备方法

固体氧化物燃料电池(solid oxide fuel cells, SOFC)和固体氧化物电解池(solid oxide electrolytic cells, SOEC)制备的关键技术之一是在保证致密性的前提下将Y2O3稳定ZrO2(yttria-stabled zirconia, YSZ)电解质薄膜化.本文将YSZ电解质薄膜制备方法归类为陶瓷粉末法、化学法和物理法,综述了近年来这些方法的研究进展.通过对每种方法技术特点的说明和实例举证,探讨了这些方法的优、缺点和适用场合.最后,通过分析和比较,对YSZ薄膜化方法未来的发展进行了展望.     

Microscopic Elucidation of Solid‐Electrolyte Interphase (SEI) Film Formation via Atomistic Reaction Simulations: Importance of Functional Groups of Electrolyte and Intact Additive Molecules

Secondary batteries such as Li‐ion battery are expected to be utilized as not only ubiquitous electric power sources such as mobile phones but also large‐scale electricity storage devices. Therefore, it is urgent to develop the higher performance secondary batteries. Their lifetime and stability are found to be strongly dependent on the nature of passivation film called solid electrolyte interphase (SEI) film formed on the anode surface in the initial charge‐discharge cycle. However, since it is difficult to directly observe the film formation processes in experiment, its microscopic mechanism is still not found. On the other hand, although the theoretical methods are useful complement to the experiment, some new methodologies are necessary to understand the long‐term processes of SEI film, which is produced as a result of that a lot of chemical reactions proceed simultaneously. Under the circumstances, we have developed Red Moon method that can simulate such complex chemical reaction systems, and were able to analyze for the first time the SEI film formation processes on the anode surface at the atomistic level. Then, we clarified theoretically the microscopic mechanism of the additive effect which is essential to improve the Na‐ion battery performance so as to enhance the SEI film formation. This new microscopic insight must provide an important guiding principle for use in designing the most suitable electrolytes for developing high‐performance secondary batteries.     

PEO-12-钨磷酸掺杂的质子导电聚合物电解质膜

以聚氧乙烯(PEO)为基质,在其中掺杂适量的钨磷酸,制备PEO-H3PW12O40质子导电聚合物电解质膜.XRD及IR测试表明体系中Keggin阴离子与PEO链相互作用形成新的化合物;Keggin阴离子的存在有利于水合质子的形成.PEO-H3PW12O40复合膜的电导率室温最高可达4.0×10-3S·cm-1.     

Influence of Electrolyte on the Electrode/Electrolyte Interface Formation on InSb Electrode in Mg-Ion Batteries

Achieving the full potential of magnesium-ion batteries (MIBs) is still a challenge due to the lack of adequate electrodes or electrolytes. Grignard-based electrolytes show excellent Mg plating/stripping, but their incompatibility with oxide cathodes restricts their use. Conventional electrolytes like bis(trifluoromethanesulfonyl)imide ((Mg(TFSI)₂) solutions are incompatible with Mg metal, which hinders their application in high-energy Mg batteries. In this regard, alloys can be game changers. The insertion/extraction of Mg²⁺ in alloys is possible in conventional electrolytes, suggesting the absence of a passivation layer or the formation of a conductive surface layer. Yet, the role and influence of this layer on the alloys performance have been studied only scarcely. To evaluate the reactivity of alloys, we studied InSb as a model material. Ex situ X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy were used to investigate the surface behavior of InSb in both Grignard and conventional Mg(TFSI)₂/DME electrolytes. For the Grignard electrolyte, we discovered an intrinsic instability of both solvent and salt against InSb. XPS showed the formation of a thick surface layer consisting of hydrocarbon species and degradation products from the solvent (THF) and salt (C₂H₅MgCl−(C₂H₅)₂AlCl). On the contrary, this study highlighted the stability of InSb in Mg(TFSI)₂ electrolyte.     

Electrical Responses and Stable Behavior of Polyaniline-polyurethane Concave Lens Array Film in Electrolyte

We present a synthetic methodology of polyaniline-polyurethane(PANI-PU) copolymer using interfacial in situ polymerization. PANI-PU copolymer was obtained through in situ polymerization of aniline precursor and the concave lens array film was molded by water drops. The fabrication of unique structured film was obtained through a solvent evaporation self-formed system. The detailed nanostructures of the film were illustrated by scanning electron microscopy(SEM) images, which showed homogeneous structure in a close-packed hexagonal arrangement. The dimension of well-structured hexagon ranged from 10.8 μm to 12.9 μm. Sensitive electrical responses of the concave lens array film resulted in the changes of swelling/shrinkage ratio in electrolyte under various conditions. Dimensional control of the film was achieved via adjusting a series of parameters including time, voltage, concentration and type of electrolyte. The electrical responses resulted rearranged molecular chain caused by redox reaction via powered PANI. Most importantly, the film maintained its response characteristics after 16 cycles. The high stability of film could be directly attributed to PU doping, which could help the PANI enhancing the mechanical strength and chemical solubility in solution.     

偏转法研究普鲁士蓝及六氰亚铁铟膜与电解质溶液间的离子效应

用现场偏转法结合循环伏安法研究了普鲁士蓝（ＰＢ）及六氰亚铁铟（ＩｎＨＣＦ）膜的电化学氧化还原过程。证实了ＰＢ膜的离子交换的机理为：且酸性条件下还原ＰＢ膜是Ｈ~＋先于Ｋ~＋进入膜内。还原态的ＩｎＨＣＦ膜氧化时，溶液中的阴阳离子同时参与了该反应，但随着阴离子的增大，Ｋ~＋成为该反应的主要参与者。     

Film Formation and Redispersion of Waterborne Latex Coatings

Poly(vinyl acetate-co-ethylene) latex dispersions are prepared and their films investigated with a focus on the effect of composition upon redispersion. Films of dispersions containing sufficient amounts of poly(vinyl alcohol) (PVA) can be redispersed in water. This property is lost in the presence of surfactant, a fact which suggests a procedure to control film formation. It is demonstrated that redispersion is due to a PVA-membrane which separates the particles. Loss of redispersibility in the presence of surfactant proceeds with the breakup of the membranes and a corresponding change of film properties. Experimental data is provided by light microscopy, mechanical testing, and TEM in conjunction with a staining method new to the field. The hypothesis is developed that interaction with surfactant leads to imperfect PVA-membranes that are no longer able to prevent latex polymer interdiffusion. Fluorescence correlation spectroscopy demonstrates the formation of surfactant micelles, as well as the simultaneous adsorption and aggregation of PVA onto the micelles. It is concluded that the competing surface of the surfactant micelles traps enough PVA to cause thinning and fragmentation of the membranes surrounding the particles, which enables interdiffusion of latex polymer. This effect can be used to convert the system from one forming a redispersible coating to one forming a nonredispersible (permanent) film. Copyright 2000 Academic Press.