共查询到18条相似文献,搜索用时 140 毫秒
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六氟磷酸锂是一种理想的锂离子电池电解质材料,由于具有极易吸潮,热稳定性较差等特点,目前难以制备出高纯度的产品。为了更好地研究六氟磷酸锂制备工艺,本文对国内外六氟磷酸锂的制备:亡艺进行了综述,并对各种方法的优缺点进行了分析。 相似文献
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六氟磷酸锂(LiPF6)为三方晶系白色晶体,是锂离子电池电解液的关键材料. 近年来随着新能源汽车的高速发展,锂离子电池及相应电解质盐(LiPF6)需求快速增长. LiPF6易潮解、热稳定性差、腐蚀性强,合成中需采用多种有毒且强腐蚀性的原料,操作需在无水无氧环境下进行,涉及多步高低温处理过程,开发一种可工业化的高纯电子级晶体制备工艺具有重大意义. 目前已有多家国内企业开发了规模化制备工艺,但仍有很大改进和提升空间. 本工作综述了LiPF6的主要合成方法和国内主要生产企业的工艺开发进展,为未来LiPF6生产工艺升级改造提供参考和指导. 对锂离子电池的市场需求、电解质在锂离子电池中的作用、LiPF6规模制备工艺及最新LiPF6项目增产、投产状况进行了论述和分析. 相似文献
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介绍了锂电子电池的主要材料组成,以及锂电子电池电解液的主要成分,总结了重要电解质材料六氟磷酸锂的制备工艺及其改进技术。 相似文献
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六氟磷酸锂(LiPF6)是目前锂离子二次电池中使用最广泛的电解质,纯度要求高,制备难度大。综述了六氟磷酸锂的制备方法,包括气-固法、溶剂法和离子交换法。认为以醚类或酯类作为合成溶剂的方法具有腐蚀小、毒性小、分离提纯简便等优点,可能是今后最有发展前景的生产工艺;同时对制备过程中的难点进行了简要分析。 相似文献
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通过碳炔类似物与单质硫共热的办法制备了多硫化碳炔,利用Raman、XRD等手段对其进行了表征。考察了多硫化碳炔分别在1 mol/L LiPF_6/EC DEC和1 mol/L LiClO_4/DOL DME电解液中的电化学性能,结果表明:多硫化碳炔在1 mol/L LiClO_4/DOL DME电解液中首次放电比容量为747 mAh/ g,60次循环比容量为236 mAh/g,容量保持率仅为31%,效率低于92%,容量衰减较快。在1 mol/L LiPF_6/EC DEC电解液中电池首放电比容量可达799 mAh/g,60次循环后比容量仍能到达520 mAh/ g,容量保持率可达65%,效率几乎100%,并讨论了多硫化碳炔在这两种电解液中的差异。 相似文献
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S.R. Sivakkumar Patrick C. Howlett Bjorn Winther-Jensen Maria Forsyth Douglas R. MacFarlane 《Electrochimica acta》2009,54(27):6844-11263
A polyterthiophene (PTTh)/multi-walled carbon nanotube (CNT) composite was synthesised by in situ chemical polymerisation and used as an active cathode material in lithium cells assembled with an ionic liquid (IL) or conventional liquid electrolyte, LiBF4/EC-DMC-DEC. The IL electrolyte consisted of 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) containing LiBF4 and a small amount of vinylene carbonate (VC). The lithium cells were characterised by cyclic voltammetry (CV) and galvanostatic charge/discharge cycling. The specific capacity of the cells with IL and conventional liquid electrolytes after the 1st cycle was 50 and 47 mAh g−1 (based on PTTh weight), respectively at the C/5 rate. The capacity retention after the 100th cycle was 78% and 53%, respectively. The lithium cell assembled with a PTTh/CNT composite cathode and a non-flammable IL electrolyte exhibited a mean discharge voltage of 3.8 V vs Li+/Li and is a promising candidate for high-voltage power sources with enhanced safety. 相似文献
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高性能六氟磷酸锂是动力锂离子电池关键材料。根据动力锂离子电池对电解质盐的要求,分析了高性能六氟磷酸锂对电池的影响。通过电感耦合等离子体质谱仪(ICP-MS)、扫描电镜(SEM)、X射线衍射仪(XRD)等检测手段,分析了国内外不同厂家制备的六氟磷酸锂产品(包括多氟多化工股份有限公司产品)的化学、物理性能,并利用电化学平台对制成的动力电池的性能进行了比较。结果表明,不同厂家制备的六氟磷酸锂产品,由于工艺控制的差异,使得产品的纯度、晶型、粒度各不相同,对电解液的质量和生产控制均有影响,最终会影响锂离子电池的循环性能和倍率性能。 相似文献
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Sn-Co-artificial graphite composite as anode material for rechargeable lithium batteries 总被引:1,自引:0,他引:1
Tao Huang 《Electrochimica acta》2010,56(1):476-482
Nanosized Sn-Co prepared by ultrasonic-assisted chemical reduction is milled with artificial graphite (AG) to form Sn-Co-AG composite. The as-prepared materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectrometry and Brunauer-Emmett-Telle (BET) surface area measurement. XRD patterns show that Sn-Co particles are poorly crystallized and artificial graphite has a typical hexagonal graphite structure phase. The diffraction peaks of Sn-Co particles remain the same but some of AG obviously change after milling Sn-Co with AG. BET areas of AG, Sn-Co and Sn-Co-AG are 1.569, 13.187 and 6.754 m2 g−1, respectively. SEM images display the as-prepared Sn-Co particles have a size distribution ranging from 20 to 70 nm in diameter. After milling Sn-Co with AG, Sn-Co particles keep similar morphology but there is a perceptible change in AG. Electrochemical tests show that Sn-Co-AG composite possesses much improved electrochemical performance than the state-of-the-art graphite. This composite has great potential as an alternative material for improving the energy density of a lithium ion secondary battery. 相似文献
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Indole monomer was chemically polymerized to produce polyindole (PI) powder for use as a positive electrode material for lithium
rechargeable batteries. Although the PI obtained was an oligomer with a low molecular weight corresponding to just 3 indole
units, its electrochemical properties exhibited high d.c. electric conductivity comparable to that of the highly conducting
polyaniline-LiPF6 or LiAsF6. A charge separation mechanism was also suggested to describe charge/discharge behavior of the oligo-indole (OI) protonated
and/or lithiated in the Li||OI battery. Moreover, the lithium rechargeable battery adopting the OI as a positive electrode
showed good cycleability with a discharge capacity of ∼55 mAh g−1, which did not decay until after more than 100 cycles. 相似文献
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Sulphur-polypyrrole composite positive electrode materials for rechargeable lithium batteries 总被引:1,自引:0,他引:1
J. Wang J. Chen K. Konstantinov S.H. Ng G.X. Wang Z.P. Guo H.K. Liu 《Electrochimica acta》2006,51(22):4634-4638
A novel conducting sulphur-polypyrrole composite material was prepared by the chemical polymerization method with sodium p-toluenesulphonate as the dopant, 4-styrenesulphonic sodium salts as the surfactant, and FeCl3 as the oxidant. The new material was characterized by Raman spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Nanosize polypyrrole particles were uniformly coated onto the surface of the sulphur powder, which significantly improved the electrical conductivity, the capacity and the cycle durability in a lithium cell compared with the bare sulphur electrode. 相似文献
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以异佛尔酮二异氰酸酯、聚碳酸酯二元醇和一缩二乙二醇为原料,合成硬段质量分数为30%的聚碳酸酯型聚氨酯(PCPU),将合成的聚氨酯和双三氟甲烷磺酰亚胺锂(LiTFSI)复合制得不同锂盐质量分数的固态聚合物电解质(SPE)。通过红外光谱分析了聚氨酯结构,采用TG、DSC测试了聚氨酯及电解质的热学性能,并采用交流阻抗、线性扫描伏安测试探究了不同LiTFSI质量分数对电解质电化学性能的影响。结果表明,随着LiTFSI质量分数的增加,聚氨酯基固态聚合物电解质的室温离子电导率呈现先增大后减小再增大的趋势,当锂盐质量分数为70%时,制备的电解质离子电导率达到最大值(1.28×10~(–8)S/cm),以此固态电解质与LiFePO4正极组装的固态电池在60℃、0.2 C电流密度时放电比容量为153 mA·h/g,循环100次容量保持率为84%。 相似文献