A Type of Lithium-ion Battery Based on Aqueous electrolyte

1 Introduction A new type of rechargeable lithium ion battery with an aqueous electrolyte was announced by W. Li et al. in 1994[1].This type of battery uses the lithium intercalation compounds LiMn2O4 and VO2 as electrode materials and an alkaline aqueous electrolytic solution. By this combination, the disadvantages of the non-aqueous Li-ion battery type, i.e. high cost and safety problems could be faded away[2]. So this type of aqueous Li-ion battery was regarded as the promising power for electric veh...     

水溶液中相转化制备六方相三氧化钼及其电化学嵌锂性质

三氧化钼(MoO3)以三种常见的物相存在:正交相、六方相和单斜相,前者为热力学稳定相,后两者为热力学介稳相.相对于稳定的正交相MoO3,介稳的六方相MoO3较难制备.笔者采用对已商品化的正交相MoO3再次结晶的方法制得了纯六方相MoO3.通过透射电镜(TEM)观察可知产物为均匀的纳米棒.实验结果表明合成的六方相MoO3的首次放电容量比商品化的正交相MoO3高.六方相MoO3有望成为理想的锂离子电池阴极材料.     

石墨烯/Cu-MOF锂电池负极材料的制备及电化学性能研究

金属有机骨架化合物是一种由金属离子与有机配体通过配位键或共价键合成的新型的电极材料。然而,其低的电子导电率和严重的不可逆锂存储制约了该材料在锂电池领域的实际应用。石墨烯具有一系列独特属性,如高的导电率、高表面积、化学稳定性，机械强度和柔韧性,多孔结构。通常用来掺杂在电极材料中以提高循环性能和增加电池的容量。在本实验中,我们研究了Cu-MOF掺杂石墨烯(Cu-MOF/RGO)作为锂电负极材料的电化学性能。结果表明,在充放电电流密度为50 mA g-1时，充放电循环50次后，材料的放电比容量可达到520 mAh g-1。同时该材料也显示出较好的倍率性能和较高的库仑效率。由此可以看出Cu-MOF/RGO是一种具有前景的锂离子电池负极材料。     

水系负极材料磷酸钛锂的研究进展

介绍了水系锂离子电池的结构、原理、特点、发展现状,以及负极材料磷酸钛锂的特点,综述了磷酸钛锂性能提升改性方法,包括特殊结构改性、晶格掺杂、引入高效导电剂等磷酸钛锂的研究进展阐释了和发展前景.     

A Template Roure to Prepare Nanowire Arrays of Amorphous Cabon Nanotube-coated Single Crystal Tin Dioxide

1 Results Tin oxide is an important n-type semiconductor of wide band due to its numerous potential applications in resistors, gas sensors, dye-based solar cells, and transparent conducting coatings for glasses and electrodes. It is also prospective anode material for high-energy density lithium ion batteries[1]. So far much work has been conducted on one-dimensional (1-D) metal oxides because their large ratio of surface/volume and their congruence of the carrier screening length with their lateral dim...     

Silane as Electrolyte Additives for Lithium Ion Batteries

1 Results In order to overcome the inherent incompatibility of PC with graphite in the lithium ion battery system, improve their electrochemical performance at low temperature,phenyl tris-2-methoxydiethoxy silane (PTMS) has been studied as an additive to the PC-based electrolyte of lithium ion batteries with graphite anode. From the cyclic voltammogram for the graphite anode in the PC-based electrolyte,we find that in the case of the electrolyte without the additive,there is a large irreversible peak ne...     

导电高分子聚苯胺碳化材料的电化学性能

采用具有一维线状结构的导电高分子聚苯胺为原料进行高温处理，制备成导电碳材料，并将其做为二次锂电池的工作电极，组装成电池，进行电化学测试，结果表明：此方法制备的硕材料具有较高的充放电容量和较好的以放电可逆性。     

Sol-gel Method Synthesized Polyhedron SnO_2 Anode Material for Lithium Ion Battery

1 Introduction Tin-based oxides will be promising anode materials for lithium ion batteries due to its high specific capacity, low potential platform, and safety[1]. Many methods have been applied to synthesize SnO2 materials of different morphologies, such as chemical vapor deposition, spray, sol-gel method[2]. Triblock copolymer poly (ethylene oxide)-block-poly (propylene oxide)-block-poly (ethane oxide) (P123) has been used as surfactant to prepare nano-crystalline tin oxide particles[3]. In this pap...     

基于尼龙6和聚偏氟乙烯复合隔膜的凝胶聚合物电解质

通过连续静电纺丝法制备了具有三明治结构的尼龙6(PA6)/聚偏氟乙烯(PVDF)/尼龙6三层复合膜,并将其用作锂离子电池凝胶聚合物隔膜.通过扫描电子显微镜(SEM)观察到该隔膜由无序的纳米纤维交织而成,具有大量的相互贯通的3D孔道.用差示扫描量热法(DSC)分析了隔膜的热稳定性,其特殊的多孔三明治结构及2种材料的搭配可...     

Facile hydrothermal and sol-gel synthesis of novel Sn-Co/C composite as superior anodes for Li-ion batteries

As an anode material in lithium ion battery, the Sn-Co/C composite electrode materials have been successfully synthesized by hydrothermal and solgel methods, respectively. The resultant composites were mainly composed of Snbased oxides, nanometer Sn-Co alloy and carbon. Carbon and Co, acting as buffer materials, can accommodate to the large volume change of active Sn during the discharge-charge process, thus improving the cycling stability. Although charge/discharge curves revealed the excellent cycle performance for samples synthesized by both methods, composites obtained by the sol-gel showed a better dispersion effect of nanoparticles on the carbon matrix and possessed much more improved stable capacity with 624.9 mAh g-1 over 100 cycles and that by hydrothermal method only exhibited ～299.3 mAh g-1. Therefore, the Sn-Co/C composites obtained by solgel synthesis method could be a perfect candidate for anode material of Liion storage battery.     

Facile synthesis of CoFe2O4 nanoparticles anchored on graphene sheets for enhanced performance of lithium ion battery

Recently, metal oxides as high capacity anode materials had been investigated for lithium ion batteries.However, the fast capacity fading upon cycling leaded poor durability, which hindered their application as higher energy density of lithium ion battery. In this paper, a nanostructured nanocomposite with graphene supported CoFe_2O_4 nanoparticles(NPs) was prepared via simple hydrothermal reaction. The uniform CoFe_2O_4 NPs were anchored on graphene sheets, which brought a good performance on cyclability. Combined with the optimization of graphene content, the anode delivered a better capacity retention of 944 m A h g~(-1)over 50 cycles at current density of 100 m A g~(-1)and the good reversible capacity as 990 m A h g~(-1)when the rate returned from 5 A g~(-1)to 0.1 A g~(-1)after 60 cycles. The present work provided a desired structure for conversion anode materials or other electrode materials of large volume change.     

Li3N film modified separator with homogenization effect of lithium ions for stable lithium metal battery

Lithium metal anode with high theoretical capacity is considered to be one of the most potential anode materials of the next generation. However, the growth of lithium dendrite seriously affects the application of lithium metal anode and the development of lithium metal batteries (LMBs). Herein, an ultrathin Li₃N film modified separator to homogenize the lithium ions and protect the lithium metal anode was reported. Due to the intrinsic properties of Li₃N, the functional separator possessed good thermal stability, mechanical properties and electrolyte wettability, and the homogenization of the lithium ion was realized without increasing the interface impedance. With this functional separator, the Li/Li symmetrical cell could achieve a long cycle with low overpotential for 1000 ​h at a current density of 1 ​mA ​cm⁻². Furthermore, when the full battery was assembled with LiFePO₄ and the discharge capacity could be maintained at 151 mAh g⁻¹ after 400 cycles at 1 ​C. In addition, the full battery also showed good rate performance, and provided a high discharge capacity of 114 mAh g⁻¹ at 5 ​C.     

中间相沥青基介孔炭的表征及其用作锂离子电池负极材料的电化学性能

以中间相沥青为碳源、CaCO_3为模板,制备中间相沥青基介孔炭(MPMC)。采用XRD、SEM、TEM等手段表征所制介孔炭的结构和形貌,并将其用作锂离子电池的负极材料,测试电化学性能。结果表明,所制MPMC具有丰富的介孔结构和较大的比表面积及孔体积,随着CaCO_3质量分数的增加,MPMC的比表面积和孔体积先增加后减小,当CaCO_3的质量分数为70%时,所制MPMC的比表面积和孔体积最大;MPMC用作锂离子电池负极材料具有良好的电化学性能,能有效提高锂离子电池的可逆比容量,具有良好的循环稳定性和倍率性能。     

锂离子电池电极材料的研究进展

综述了国内近年来锂离子电池的正极和负极材料的研究进展，对正极材料中LICoO2，LiNiO2和LiMnO4，负极材料中的碳素和非碳素材料以及合金等的研究现状及发展趋势分别作了评述.。     

Effect of Calcining Temperature on the Structure of Li_4Ti_5O_(12)

1 Introduction Recently there had considerable interest in Li4Ti5O12 as a potential anode for use in Li-ion batteries. Usually, it was used as an anode combined with a high voltage cathode[1-5]. It has many advantages compared to the currently used graphite. For example, it presents virtually unlimited cycle life due to zero strain or volume change when lithium intercalates into and de-intercalates from[6]. Generally, Li4Ti5O12 was prepared by a solid-state reaction from stoichiometric amounts of Li2CO3...     

Inorganic-Organic Composite Materials for Lithium Batteries

1 Results In order to develop high capacity anode materials for enhancing the performance of lithium-ion batteries,silicon (Si) and a variety of metals that alloy with lithium,such as Sn,Sb,and Al,were studied and found to be promising candidates as anode materials[1-4].Among them,Si appears to be the most attractive candidate due to its large theoretical lithium insertion capacity of 4 200 mAh g-1[1].Unfortunately,there is one severe problem with the application of Si anode,i.e., the large volume chang...     

高性能锂离子电池SiO/C复合负极材料研究

以SiO为硅源,柠檬酸为碳源,通过高能球磨和高温热解制备了一种循环性能优异的锂离子电池SiO/C复合负极材料.采用X-射线衍射仪（XRD）、扫描电子显微镜（SEM）对复合材料的物相和形貌进行了表征.具有孔状结构的柠檬酸热解碳对纳米SiO不仅具有良好的包覆效果,也能有效缓冲电化学嵌脱锂过程中硅颗粒释放出来的体积变化.电化学性能测试表明,SiO/C复合负极材料电极循环100次后容量仍高达803.1mA.h/g,容量保持率为89%.     

Optimizing the Synthetic Conditions of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 from a Carbonate Co-precipitation Method

1 Introduction As a promising cathode material for lithium ion batteries,LiNi1/3Co1/3Mn1/3O2 attracted intensive attentions.Owing to high specific capacity,long circle life and excellent safety,it may be an alternative candidate for LiCoO2.As a complex composite,however,it is difficult to synthesize phase-pure LiNi1/3Co1/3Mn1/3O2 by a simple mixed calcination method[1].From this concern,carbonate co-precipitation method,which can prepare homogeneous LiNi1/3Co1/3Mn1/3O2 with typical layered structure,bec...     

Annealing temperature-dependent electrochemical properties of Aeroxide P25 TiO_2 nanoparticles as anode material for lithium storage

TiO_2 has been widely studied as an important electrode material for electrochemical energy storage.Understanding its relationship between textural properties and electrochemical characteristics is essential to boosting its practical performances. Herein, Aeroxide P25 TiO_2 nanoparticles annealing at different temperatures(400–600 °C) were investigated as an anode material of lithium ion battery. Their evolution in crystal phase and microstructural characteristics were characterized by XRD and BET surface analysis, and their lithium storage properties in half-cells were evaluated by various electrochemical analyses, including cyclic voltammetry, cycling testing, and electrochemical impedance spectroscopy. It was found that the lithium storage properties were critically dependent on the size of TiO_2 anode materials. Pristine P25 initially exhibited the highest initial discharge specific capacity due to its smallest particle size; however, rapid capacity loss occurred during extended cycling. The annealing process was found to effectively enhance the cycling stability of TiO_2 although possessing a large particle size and smaller surface area. Typically, P400 showed the best performances in cycling stability, capacity retention ratio, and rate capability, which is mainly attributed to the synergistic effect of high crystallinity, reasonable particle size, and less internal resistance. This study provides an instance of optimizing the textural properties of metal oxides for advanced LIB anode material applications.     

Synthesis of dandelion-like TiO2 microspheres as anode materials for lithium ion batteries with enhanced rate capacity and cyclic performances

Dandelion-like TiO₂ microspheres consisting of numerous rutile single-crystalline nanorods were synthesized for the first time by a hydrothermal method. Their crystal structure, morphology and electrochemical properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and galvanostatic charge and discharge tests. The results show that the synthesized TiO₂ microspheres exhibit good rate and cycle performances as anode materials of lithium ion batteries. It can be found that the dandelion-like structure provides a larger specific surface area and the single-crystalline nanorod provides a stable structure and fast pathways for electron and lithium ion transport, which contribute to the rate and cycle performances of the battery.