共查询到18条相似文献,搜索用时 171 毫秒
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介绍了锂离子电池用四氟硼酸锂的性质,概述了固相-气相法(三氟化硼法,包括气流式反应合成法、LiF悬浮液法)、BB络合物与LiF于乙醚中的非水溶液法、水溶液法(包括四氟硼酸法、偏硼酸锂法)制备电池用四氟硼酸锂方法,比较了他们的优缺点。认为固相-气相法合成的四氟硼酸锂因工艺本身的缺陷而使产品质量较差,难以满足电池级四氟硼酸锂的要求;目前国内生产技术尚不成熟。 相似文献
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文章综述了近年来锂离子电池豹新型锂盐一双乙二酸硼酸锂(LiBOB)研究的成果。介绍了双乙二酸硼酸锂的合成方法、组成与结构、化学和电化学性能及其与结构的关系。并重点综述了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。总结了LiBOB的优缺点,指出了其进一步的研究方向。 相似文献
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随着锂电池行业的快速发展,中国锂原料对外进口的依赖程度逐年增加。从粉煤灰中回收锂,既可以缓解中国锂供应量严重不足的现状,又可以有效解决粉煤灰污染环境的问题。在分析比较锂矿石、盐湖卤水和粉煤灰的组成及其特点的基础上,从浸出和提取两个方面综述了目前粉煤灰回收锂的工艺技术。锂浸出工艺受粉煤灰浸出铝工艺的影响,目前已较为成熟,主要有酸法浸出和碱法浸出工艺。锂提取技术则受锂浸出工艺的影响,酸法浸出工艺的浸出液杂质元素比较多,提锂过程比较复杂,目前主要有溶剂萃取法、煅烧浸出法和吸附法;碱法浸出工艺的浸出液杂质元素简单,提锂相对容易,目前主要采用的是吸附法。由于粉煤灰浸出液与盐湖卤水的成分相似,因此借鉴盐湖卤水的提锂技术经验,开发适用于粉煤灰浸出液的提锂技术,是未来粉煤灰回收锂的主要研究方向。 相似文献
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Studies on lithium salts to mitigate ASR-induced expansion in new concrete: a critical review 总被引:1,自引:0,他引:1
This paper provides a critical review of the research work conducted so far on the suppressive effects of lithium compounds on expansion due to alkali-silica reaction (ASR) in concrete and on the mechanism or mechanisms by which lithium inhibits the expansion. After a thorough examination of the existing literature regarding lithium salts in controlling ASR expansion, a summary of research findings is provided. It shows that all the lithium salts studied, including LiF, LiCl, LiBr, LiOH, LiOH·H2O, LiNO3, LiNO2, Li2CO3, Li2SO4, Li2HPO4, and Li2SiO3, are effective in suppressing ASR expansion in new concrete, provided they are used at the appropriate dosages. Among these compounds, LiNO3 appears to be the most promising one. Although the mechanism(s) for the suppressive effects of lithium are not well understood, several mechanisms have been proposed. A detailed discussion about these existing mechanisms is provided in the paper. Finally, some recommendations for future studies are identified. 相似文献
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单斜结构的磷酸钒锂[Li3V2(PO4)3]材料与其他锂离子电池正极材料相比具有较高的工作电压(3.0~4.8 V)、良好的离子迁移率和优良的热稳定性,是一种具有竞争优势和发展前景的大功率锂离子电池正极材料,成为了近年来研究的热点。综述了锂离子电池正极材料磷酸钒锂的结构特点及其充放电机理。磷酸钒锂的常用合成方法有碳热还原法、水热法、溶胶-凝胶法及流变相法等,着重阐述了磷酸钒锂的不同合成方法对所制备样品的形貌和电化学性能的影响。分析总结了不同合成方法的改进方法,以改善磷酸钒锂正极材料电子导电性和锂离子扩散系数较低的问题。最后,针对磷酸钒锂正极材料在锂离子电池的应用中所存在的问题展望了该材料未来可能的发展方向和研究热点。指出需要优化材料的制备方法以改善材料的颗粒形貌、提高电子导电率和扩散系数等,进而改善材料的循环性能、倍率性能和充放电性能等;需要改进制备流程、提高实验的安全性、简化反应流程和减少制备成本等,以实现磷酸钒锂正极材料的工业化应用。 相似文献
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M. M. Iovleva 《Fibre Chemistry》2001,33(3):172-176
After examining a number of polymer—aprotic solvent—lithium chloride systems to clarify the role and mechanism of action of lithium chloride, the following conclusions were drawn: for some polymers (poly-p-benzamide, Armos copolymer, cellulose), only addition of lithium chloride to the aprotic solvent makes them soluble; the lithium chloride contained in the aprotic solvent can decrease the effective viscosity of spinning solutions of some polymers by several times; the mechanism of action of lithium chloride in a solution of polymers in an aprotic solvent consists of its reaction with the polymer and the solvent — both in the form of individual lithium and chlorine ions and in the form of an ion pair; each of the two mechanisms can be manifested to a different degree for different polymers, resulting in a change in the intermolecular interactions in the solution and sometimes also the conformation of the macromolecules; the concepts discussed in the article could be useful in further elaboration of problems related to addition of lithium chloride and other salts to solutions of fibre-forming polymers. 相似文献
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Shanshan Wang 《Polymer》2010,51(13):2864-2871
Thermoplastic polyurethane (TPU) electrolytes with lithium salts were prepared by an in-situ polymerization method. Three different lithium salts were used to study the effects of the anion structure on the properties of polyurethane electrolytes: LiCl, LiClO4, LiN(SO2CF3)2 (LiTFSI). The effects of the anion structure on monomer (PTMG) prior to polymerization and on the properties of TPU electrolytes post polymerization were investigated. The anion structure of lithium salt has a significant influence on the ionic conductivity, thermal stability and tensile property of TPU electrolytes. The TPU electrolytes with LiTFSI demonstrated a high ionic conductivity up to 10−5 S/cm at 300 K. The ionic conductivity of polyurethane electrolytes with lithium salts is in the order: LiCl < LiClO4 < LiTFSI. It was found that the lithium salts with larger anions were easily dissociated in TPU and had stronger interaction with TPU, which provided more charge carriers and gave higher ionic conductivity. 相似文献
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主要论述了一种提纯盐湖锂矿和回收含氟碳酸锂的方法。工艺流程:盐湖锂矿(含氟碳酸锂)通过一次水洗涤除去其中所含的大部分可溶性杂质后,按一定配比将其投入到石灰乳料浆中加热到90~95 ℃反应4 h,过滤后得到氢氧化锂溶液,将氢氧化锂溶液在100~120 ℃下进行加压浓缩4 h精制得到钙镁离子和硅含量较低的氢氧化锂溶液;向精制后的氢氧化锂溶液中通入食品级二氧化碳沉锂得到工业级碳酸锂,或继续浓缩制备氢氧化锂;用以上工艺生产得到的工业级碳酸锂通过二次碳化、阳离子交换树脂除去钙镁离子、重结晶可得到硅含量为10×10-6以内的高纯碳酸锂,或浓缩得到钙含量为5×10-6、镁含量为2×10-6以内的单水氢氧化锂。 相似文献