锂离子电池氧化物负极材料的研究

采用氨解法制备了SnO，Sb2O3，GeO2 3种氧化物粉末，将其分别作为锂离子电池负极材料的活性物质，利用恒电流电池测试仪研究其电化学性能．研究发现，这3种活性物质有较高的电化学容量，其首次放电容量分别为1520mAh/g(GeO2)，820mAh/g(Sb2O3)，1040mAh/g(SnO)；首次充电容量分别为800mAhg/(GeO2)，520mAh/g(Sb2O3)，800mAhg/(SnO)．同时还发现其不可逆容量损失也较大，讨论了产生这一结果的可能原因，提出了减少不可逆容量损失的办法．     

废旧锂离子电池负极材料回收利用研究进展

锂离子电池的广泛应用导致大量废旧锂离子电池产生,废旧锂离子电池具有危险废弃物和可用资源的双重属性,利用不同的回收工艺实现废旧锂离子电池的高效回收再利用对环境保护和资源再生均有重要意义.在论述锂离子电池的组成和回收其中有价金属的基础上,着重介绍废旧锂离子电池材料放电预处理、负极活性物质的分离回收及负极材料的再利用,以期找...     

锂离子电池负极材料的研究现状及研究方向

在简要介绍锂离子电池的工作原理的基础上,对锂离子电池负极材料的研究现状进行分析,比较各种负极材料的优缺点,并对未来的研究方向进行展望,指出对各类锂离子电池负极材料,应该结合其优缺点,有针对性和侧重点地单独研发,如开发高容量型合金负极、高功率/高安全型钛酸锂负极以及低成本型金属氧化物负极材料。     

锂离子电池硬碳负极材料的现状及展望

硬碳具有高容量,优异的倍率特性和良好的低温性能,成为电动车电池最具潜力的负极材料.综述了硬碳材料的研究和应用进展,指出任意堆积的石墨烯层结构决定了硬碳材料的性能;原材料和制备工艺会影响硬碳材料的规模化生产质量和应用.随着电动汽车产业的兴起和硬碳材料应用的增长,其相关应用研究将成为热点.     

纳米CoSb作为锂离子电池新型负极材料的研究

用溶剂热法合成了纳米尺寸的CoSb合金粉末，并研究了该合金粉末作为锂离子二次电池新型负极材料的电化学性能.合成的合金粉末经过了X射线衍射 (XRD)、透射电镜 (TEM) 和场发射扫描电镜 (FESEM) 的表征,研究发现，该合金粉末的首次可逆容量达到362 mA·h/g，经过了20个循环后，其可逆容量仍保持在320 mA·h/g. 与用悬浮熔炼/球磨工艺所得的微米尺寸的合金粉末相比，用溶剂热方法制得的纳米CoSb粉末的可逆容量和循环性能均显著提高.这是因为，纳米CoSb粉末颗粒尺寸较小，在充放电过程中绝对体积变化较小 (尤其在最初的几个循环中)，这显著地减缓了活性材料的粉化和剥落.     

碳包覆石墨作为锂离子电池负极材料的研究

将天然石墨(NG)用浓HNO3氧化处理后,在其表面包覆柠檬酸,在惰性气体气氛下700℃处理18h,制得了包覆改性石墨.采用XRD及电化学测试等手段对材料进行了结构表征和性能测试.考察了不同包覆比例对材料充放电性能的影响.XRD结果表明包覆改性对石墨的结构并没有明显的影响.充放电测试表明,与天然石墨相比,包覆改性石墨具有更好的电化学性能,其中又以石墨与柠檬酸质量比为2∶1时性能最好,其首次放电容量为345.1 mA h g1,经20次循环后容量仍保持在305 mA h g1以上,容量衰减率仅为11.01%.     

锂离子电池锡合金负极薄膜材料制备及性能

采用化学沉积的方法在铜箔上制备锡薄膜,通过改变沉积条件,制得三种不同厚度和结构的锡合金负极材料.运用XRD、SEM、充放电和循环伏安等多种方法对电极结构和性能进行表征和研究.研究表明:沉积时间为10min的锡薄膜负极材料具有四方晶系结构,其表面由尺寸在4μm左右的合金颗粒构成,颗粒有大小均匀的孔洞结构,增加了电极的比表面积.该锡薄膜电极具有较高的容量,在0.01～1.00V电压区间内,电极的首次放电容量为885.7mAh/g,循环100周后放电容量仍保持在460mAh/g以上.     

煤基碳负极材料在锂离子电池中的应用研究进展

随着碳达峰、碳中和成为全球共识,电化学储能技术和相关产业得到了飞速发展,与此同时电极材料的需求也与日俱增。因此,如何利用来源广泛、成本低廉的前驱体制备高性能负极材料成为国内外研究的热点。煤炭因具有碳含量高、储量丰富和价格低廉等特点成为最有潜力的负极材料前驱体。近年来,研究者以煤炭为原料制备了无定型碳、石墨、碳纳米管和石墨烯等负极材料,并对其在锂离子电池中的应用进行了深入研究。总结了三类典型的煤基碳负极材料在锂离子电池中应用的研究进展,并对其合成方法、优化改性及电化学性能等方面进行了综述,最后对煤基碳负极材料的发展及应用进行了展望。     

锂离子电池高性能硅基负极材料研究进展

硅基材料因其具有较高的理论比容量被认为是具有广阔前景的锂离子电池负极材料,在近年来得到广泛的研究;但是硅较差的电子导电性和在充放电过程中的巨大的体积膨胀问题,导致其具有较差的循环性能,阻碍了它的商业化应用。本文从介绍硅材料储锂机制及失效原理出发,重点综述了近年来对硅基材料的改性研究,主要包括对硅材料的纳米化及维度设计、硅复合材料的制备及其结构设计、新型粘结剂与电解液/电解液添加剂的研究和预锂化技术的研究。最后文章对硅基负极材料的结构设计、性能改进研究进行了总结,并展望了高容量硅基负极材料在高比能锂电池等领域的应用前景。     

锂离子电池硅/石墨复合负极材料的制备及性能研究

锂离子电池发展的重要目标之一是高容量的负极材料,而硅材料以其高达4 200 mAh/g的理论比容量成为研究热点;但是硅负极材料有较大的体积效应,从而造成其电化学循环性能的快速下降,限制了其在生产中的应用.本研究以纳米硅与石墨不同比例的掺杂,通过高能球磨与退火处理,表明当硅与石墨比例为2：1时,首次放电比容量可达2 136.4 mAh/g,同时首次的充放电效率为85.5%; 经过35次循环之后,其可逆容量的保持率85.3%,具有良好的电化学性能.硅/石墨复合材料良好的电化学性能,使其在锂离子电池负极材料的生产及应用中具有重要研究价值.     

Carbonaceous mesophase spherule/activated carbon composite as anode materials for super lithium ion capacitors

A series of carbonaceous mesophase spherule/activated carbon composites were prepared as anode materials for super lithium ion capacitors using carbonaceous mesophase spherules as the core materials and pitch as the active carbon shell precursor.The structures of the composites were examined by scanning electron microscopy and X-ray diffractometry.The electrochemical performance was investigated in electric double layer capacitor and half-cell.The results show that,the composite exhibits good performance in...     

Optimizing pyrolysis of resin carbon for anode of lithium ion batteries

1INTRODUCTION Lithiumionbatterieshaveattractedworldwide attentionandbeendevelopedrapidlyduetotheirhighenergydensity,goodcharge dischargeper formancesandlongcyclelife[14].Theseoutstand ingpropertiesresultfromtheuseofcarbonmateri alsasanodeinsteadoflithiummetal.However,thespecificcapacityofcarbonmaterialsisfar smallerthanthatoflithiummetal(3670mA·h/g).Muchefforthasbeenfocusedonimprovingca pacityofcarbonanodesduringthepastfew years[57].Recentworkindicatedthatdisorderedcar bons,obtainedbypy…     

Novel Nanosized Adsorbing Composite Cathode Materials for the Next Generational Lithium Battery

A novel carbon-sulfur nano-composite material was synthesized by heating sublimed sulfur and high surface area activated carbon （HSAAC） under certain conditions. The physical and chemical per- formances of the novel carbon-sulfur nano-composite were characterized by scanning electron microscopy （SEM）, Brunauer-Emmett-Teller （BET） and X-ray diffraction （XRD）. The electrochemical performances of nano-composite were characterized by charge-discharge characteristic, cyclic voltammetry and electrochemical impendence spectroscopy （EIS）. The experimental results indicate that the electrochemical capability of nano- composite material was superior to that of traditional S-containing composite material. The cathode made by carbon-sulfur nano-composite material shows a good cycle ability and a high specific charge-discharge capacity. The HSAAC shows a vital role in adsorbing sublimed sulfur and the polysulfides within the cathode and is an excellent electric conductor for a sulfur cathode and prevents the shuttle behavior of the lithium-sulfur battery.     

Soft chemical synthesis and electrochemical properties of tin oxide-based materials as anodes for lithium ion batteries

1　INTRODUCTIONWiththedevelopmentoflithiumionbatteries ,thereisanincreasingdemandforelectrodematerialspossessinghighcapacity .Muchresearchwasunder takentosearchfornewanodematerialsin placeofcarbon (theoreticalmaximumcapacityof 372mA·h·g- 1)toimproveenergydensityforrechargeablelithi umionbatteries[110 ] .Notably ,tinoxide basedmate rials ,aspossiblecandidatesforthenextgenerationanodematerialsforLi ionbatteriesduetotheirhighlithiumstoragecapacityandlow potentialoflithiumionintercalation ,…     

多孔碳包覆硅微球于锂离子电池负极中的应用

为了缓解纯硅负极材料在充放电过程中带来的巨大体积效应并降低电解质与电极之间的副反应程度,提出了一种简单高效的硅碳复合材料合成方法.以P123为分散剂、葡萄糖为碳源,利用水热法制备P-Si/C复合材料.结果表明,制备得到的复合材料可以极大地缓解充放电过程中产生的体积效应.当复合材料作为锂电池负极时,其首次放电比容量为1 800 mA·h/g,在500 mA/g电流密度下经100次循环后,其放电比容量能够稳定维持为521 mA·h/g,呈现出良好的循环性能.     

Nano-sized Sn/MWNTs and MWNTs Served as the Anode of Lithium Ion Battery

A chemical deposition was supposed to be an effwient method in preparation of nano-sized Sn/ MWNTs. The nanoconmposites of MWNTs and Sn/ MWNTs were both used as anodes of lithium ion battery. The special capacities and coulomb efficiencies of Snl MWNTs were studied by means of electrochemical methods. The coating of Sn on MWNTs observed by TEM was amorphous and nano-sized. The reversible capacity of Sn/ MWNTs , which was much larger than that of MWNTs , was 824 mAh/ g in the 1 st charge and discharge cycle. The coulomb efficiency of Sn/ MWNTs in the 1 st cycle was increased by 16% compared with that of MWNTs. The additional Sn, which was 37wt% of total Sn/ MWNTs＇ weight, introduced the additional reversible lithiation capacity at least 250 mAh/ g in the 40 charge and discharge cycles. The dispersing degree of Sn on MWNTs was the main reason for the influence of the electrochemical perfomance of the Sn/ MWNTs . Sn/ MWNTs is proved to be a promising candidate as an anode of lithium ion battery.     

Mild oxidation treatment of graphite anode for Li-ion batteries

1　INTRODUCTIONNumerous carbonaceous materials have beeninvestigated as anodes of lithium ion batteries dur ing the past several years[1 4]. Graphite is an at tractive material for anodes of lithium ion batteriesdue to its high reversible capacity (372 mA·h/g intheory), low and flat discharge potential (0.1 0.2 Vvs. Li)[5 8]. However, there are still some prob lems for the graphite in the application with respectto a low practically available capacity, and a largeir…