锂辉石—石灰石烧结中煤粉代替重油作燃料的研究和实践

目前世界锂工业原料以锂辉石为主。我国锂辉石储量居世界首位，主要分布于新疆、四川、湖南等地，其中又以四川的储量占全国第一。锂的主要基础化合物ＬｉＯＨＨ２Ｏ系用锂辉石－石灰石烧结法而得，烧结燃料是影响ＬｉＯＨＨ２Ｏ产品价格的重要因素之一。过去国内外均采用...     

聚二甲基－二苯基硅氧烷二醇的制备

采用ＬｉＯＨ作催化剂，ＤＭＦ为促进剂，利用八甲基环四硅氧烷（Ｄ４）、八苯基环四硅氧烷（Ｐ４）为单体，制备聚二甲基－二苯基硅氧烷二醇．在一定条件下，其分子量可由加水或ＬｉＯＨ的量控制．未反应的Ｐ４可由石油醚－甲醇处理除去．     

CID-ICP-AES用于高纯试样的分析性能

研究了CID-IP-AES用于测定高纯物质的分析性能。以高纯LiOH为对象，研究了低浓度范围内分析线的选择，标准曲线的特性，探讨了直接用于高纯物质分析的检测能力及可行性。     

ICP-AES法同时测定氯化锂和氢氧化锂中七种杂质元素

本文报导了用ＩＣＰ－ＡＥＳ法同时测定ＬｉＣｌ和ＬｉＯＨ·Ｈ２Ｏ中７种杂质元素Ａｌ、Ｂａ、Ｃａ、Ｆｅ、Ｍｇ、Ｓｉ、Ｚｎ的分析方法。研究了基体元素锂对被测元素的基体效应，采用基体匹配法与背景扣除法进行校正。被测元素的检出限为０．１－９．４ｎｇ／ｍＬ，加标试验回收率为９２％－１０９％，当杂质元素含量为０．０００１％－０．０２８％时，相对标准偏差小于７％。方法简便、快速、准确，用于样品分析，取得了满意的结果。     

Solid-state synthesis of Li[Li0.2Mn.56Ni0.6Co0.08]O2 cathode materials for lithium-ion batteries

Layered Li[Li0.2Mn.56Ni0.6Co0.08]O2 cathode materials were synthesized via a solid-state reaction for Liion batteries, in which lithium hydroxide monohydrate, manganese dioxide, nickel monoxide, and cobalt monoxide were employed as metal precursors. To uncover the relationship between the structure and electrochemical properties of the materials, synthesis conditions such as calcination temperature and time as well as quenching methods were investigated. For the synthesized Li[Li0.2Mn.56Ni0.6Co0.08]O2 materials, the metal components were found to be in the form of Mn4＋, Ni2＋, and Co3＋, and their molar ratio was in good agreement with stoichiometric ratio of 0.56：0.16：0.08. Among them, the one synthesized at 800 ℃ for 12 h and subsequently quenched in air showed the best electrochemical performances, which had an initial discharge specific capacity and coulombic efficiency of 265.6 mAh/g and 84.0%, respectively, and when cycled at 0.5, 1, and 2 C, the corresponding discharge specific capacities were 237.3, 212.6, and 178.6 mAh/g, respectively. After recovered to 0.1 C rate, the discharge specific capacity became 259.5 mAh/g and the capacity loss was only 2.3% of the initial value at 0.1 C. This work suggests that the solid-state synthesis route is easy for preparing high performance Li[Li0.2Mn0.56Ni0.16Co0.08]O2 cathode materials for Li-ion batteries.     

二氧化碳吸附剂静态吸附性能的实验

为降低地下空间内二氧化碳浓度,确保人员正常生存和工作,研制了去除二氧化碳的氢氧化锂片剂.从温湿度两方面对吸附剂吸附效率的影响进行了实验研究.以羧甲基纤维素和无水氢氧化锂为主,采用高压压片制得二氧化碳吸附剂,并在密闭室内对其进行二氧化碳吸附实验,得到如下结果:温度对片剂吸附率的影响要强于湿度的影响;湿度为70%时,温度17℃对应的吸附率高于22℃对应的吸附率;22℃时,相对湿度50%对应的吸附率高于60%时对应的吸附率;27℃时,湿度对吸附率的影响不明显;11 h内片剂最高静态吸附率能达到89%.结果表明,氢氧化锂片剂单位体积对二氧化碳的吸附量大,吸附稳定,适合于地下空间密闭时二氧化碳的去除.     

纤维素在氢氧化锂／尿素水介质中的溶液性质研究

纤维素可以在氢氧化锂／尿素的混合水介质中溶解．选取三种不同分子量的纤维素，在N，N-二甲基乙酰胺／氯化锂体系中进行溶解，并通过粘度法，准确确定其分子量．而后，在4．2％氢氧化锂与12％尿素的水介质中溶解它们．通过粘度法测定其特性参数，得到该溶液体系的M—H方程：[η]=1．695×10^-3Mη^0.914（mL·g^-1）．并测定了体系的ML和q值分别为387．5nm^-1和6．1nm,显示纤维素在该溶剂中以半柔性链的形式存在．同时，采用SEM和POM（polarized optical microscopy）分别研究了纤维素在溶解前后结构的变化，同样证实在氢氧化锂／尿素体系中纤维素可以很好地被分散，且通过不同的组装方式形成新的集聚态结构．     

单水氢氧化锂完成液除硫方法

1　引言随着人们对金属锂的不断认识 ,锂及其化合物应用也更加广泛。在热核反应中3Ｌｉ6 是得到1 Ｈ3的原料 ,金属锂可做原子能反应堆的冷却剂 ,ＬｉＯＨ在碱性蓄电池中作电解液添加剂等[1 ] 。我国的锂资源主要是锂辉石和锂云母。从锂云母中提取氢氧化锂 ,目前我国主要采用石灰石烧结法[2 ] 。此法设备比较简单 ,原料便宜 ,但由于燃料煤中含硫较高 ,浸出时进入溶液 ,严重影响了ＬｉＯＨ·Ｈ2 Ｏ的质量。硫在完成液中以ＳＯ2 -4 的形式存在。目前我国锂盐厂均采用加Ｂａ(ＯＨ) 2 除硫法[3,4] ,但存在Ｂａ(ＯＨ) 2 用量偏大 ,工艺条件没有严…     

Orthorhombic 3-LiV2O5 as Cathode Materials in Lithium Ion Batteries： Synthesis and Property

The rod-like and bundle-like v-LiV205 were synthesized via a simple solvothermal process- ing. The rod-like 7-LiV205 with diameter of 500-800 nm and the bundle-like architectures are composed of several of order-attached rods with diameter of 100-600 nm. ＂y-LiV205 were synthesized using LiOH.H20, NH4VO3, HNO3, C2H5OH without and with PVP as raw materials. At the same time, the actual formation mechanism of Y-LiV205 was also investigated. As the cathode materials for lithium ion batteries, the bundle-like Y-LiV205 prepared with PVP delivers a better electrochemical performance, which has an initial dis charge capacity of 269.3 mAh/g at a current density of 30 mA/g and is still able to achieve 228 mAh/g after the 20th cycle. The good electrochemical properties of the as-synthesized Y-LiV205 coupled with the simple, relatively low temperature, and low cost of the prepara tion method may make this material a promising candidate as a cathode material for lithium ion batteries.