Development of carbon conductive additives for advanced lithium ion batteries

The newly developed conductive carbon blacks C-NERGY™ Super C65 and C-NERGY™ Super C45 were studied with regard to their performance as conductive additives in positive lithium ion battery electrodes and compared to other reference conductive carbon blacks. The lowest electrical volume resistivity and highest compressibility were found for C-NERGY™ Super C45 dry-mixed with LiCoO₂ powder. Mixing by high shear forces in acetone dispersion improved the electrical resistivity and compressibility of the C-NERGY™ Super C65 containing LiCoO₂ mixture to the same level obtained for the C-NERGY™ Super C45 mixture in the same process. Acetone dispersions of C-NERGY™ Super C45 and LiCoO₂ showed the lowest viscosities attributed to the carbon black's specific BET surface area of 45 m² g⁻¹ being the lowest of all carbon blacks studied. The easy dispersibility of C-NERGY™ Super C45 in LiCoO₂ could be explained by its particular surface group chemistry characterized by time-of-flight secondary ion mass spectrometry. The electrical volume resistivity of the LiCoO₂/carbon black mixtures was in line with the high current rate performance of half-cells with related LiCoO₂ electrodes. Compared to the investigated carbon blacks, the electrical volume resistivity of the graphite conductive additives C-NERGY™ KS6L and C-NERGY™ SFG6L at different concentrations in LiCoO₂ powders showed higher critical volume fractions but lower ultimate resistivity levels. Adding one of these graphites to the carbon black conductive mass improved the electrode density and, at concentrations above the critical volume fraction of the graphite component, significantly decreased the ultimate resistivity level of the LiCoO₂ electrode mass.     

环氧导静电涂料混合溶剂的研究

研究油罐内壁环氧导静电涂料,对保证石油贮罐的安全使用、排除静电荷的积累有着重要意义。不同比例的混合溶剂对环氧导静电涂料的各种性能影响很大,因此,混合溶剂的选择尤为重要。本实验选用二甲苯和正丁醇作为环氧树脂的混合溶剂,研究不同比例的混合溶剂对环氧树脂溶解能力的影响,以及对漆膜导静电性能、耐油性能的影响。结果表明:二甲苯与正丁醇按质量比1:1配制的混合溶剂对环氧树脂E-20具有较强的溶解能力,且制备的漆膜具有优异的导电性和耐油性。     

麦垛山井田煤岩层变化规律的测井资料研究

麦垛山井田是宁东煤田大型井田之一.利用测井资料对测井曲线的研究发现,同一井田的煤、岩形态和组合特征有一定的规律性,反映到测井曲线上就表现出一定的地球物理特征,包括曲线的幅值、形态、组合特征和某些特殊的物性标志,这些特征及其变化规律在井田内的钻孔中大体一致,因此,确定了宁东煤田麦垛山井田的编号煤层及标志层.通过研究该井田标志层的长源距伽马-伽马、自然伽马和电阻率曲线的形态特征,掌握了主要可采煤层变化规律,从而在宁东煤田中生代含煤地层开展无岩心钻进奠定了基础,这就大大提高了钻探效率,缩短了勘探时间,提高了经济效益,加快了煤炭地质勘探工作进程.     

抗静电聚(丙烯腈-丁二烯-苯乙烯)材料的制备

通过合成一种两亲型阳离子高分子抗静电剂,并将该抗静电剂与聚(丙烯腈-丁二烯-苯乙烯)(ABS)经成型加工制得样条,然后测试样条在水煮1 h前后的表面电阻率以及测试抗静电剂的加入对ABS材料的力学性能的影响.结果表明:这种抗静电剂的加入使ABS表面电阻率降至108Ω/m2,水煮1 h后的电阻率仍有1010Ω/m2,而抗静电剂的加入使ABS的拉伸性能未有明显下降,但断裂伸长率却有所升高.     

分布不均匀高土壤电阻率地区接地的综合治理

介绍了几种发电厂、变电所在分布不均匀的高土壤电阻率地区接地网的综合治理措施 ,并对发电厂、变电所地网结构进行了探讨。     

稀土磁体在汽车中的应用现状及前景展望

基于汽车零部件以稀土磁体提出的耐热性的要求，阐述了稀土磁体的耐热性及其对策、应用现状及前景展望。     

稻类秸秆高温炭化焦炭的特性研究

利用自制的高温炭化试验装置在不同最终炭化温度下制备稻秆和稻壳焦炭,研究了稻秆和稻壳焦炭电阻率的变化规律,分析稻秆和稻壳焦炭微观形态、化学成分、官能团分布等与电阻率之间的依变关系.当最终炭化温度从400.℃升高到1.400.℃时,稻秆和稻壳焦炭的电阻率分别从∞减小到0.40.Ω.cm和从∞减小到1.49.Ω.cm.在900.℃以上时,焦炭微观结构与温度关系不大,而随秸秆种类不同而差异较大;稻秆焦炭外表面为层叠的不规则薄片;稻壳焦炭外表面为规律排列的瘤状凸起结构,这使得其在一定压力下难以紧密压实,增大了体积电阻率.对焦炭中的特征官能团分析表明,随着温度的升高,焦炭中C=C峰值增加,而C—O键、O—H键的特征峰值减小,另外,当最终炭化温度从900.℃升高到1.400.℃时,稻壳焦炭中的C/O原子数比从21升高到695,两者相互呼应.     

Synthesis and Characterization of Novel Bisphenol-C-formaldehyde-acrylate-toluene Diisocyanate-PEG-400 Copolyurethanes

Bisphenol-C-formaldehyde-acrylate-TDI polyurethane and bisphenol-C-formaldehyde-acrylate-TDI-PEG-400 [0.001 mol (PUA-I), 0.0005 mol (PUA-II), and 0.00025 mol (PUA-III)] copolyurethanes have been synthesized at room temperature. The polyurethane formation is verified by Fourier transform infrared spectroscopy (FTIR). The PUA-I-III are further characterized for their thermo-mechanical and electrical properties and also their chemical resistance against water, 10% each of aqueous NaCl, HCl, HNO₃, H₂SO₄, NaOH, and KOH. Density, tensile strength, and volume resistivity increased, while electric strength decreased with decreasing concentrations of PEG-400. Copolyurethanes possess weight-gain tendency in acidic and alkaline environments and possess excellent hydrolytic stability in harsh acidic, alkaline, and saline environments. In acidic and alkaline environments, the % weight-gain tendency is found to increase with decreasing PEG-400 content. The DSC transitions in conjunction with TG data confirmed multistep decomposition of copolyurethanes. The PEG-400 affected thermal stability to a considerable extent. Copolyurethanes may find applications as good insulators as well as coating materials for harsh environments.     

用跨井电磁波资料重现地下介质的电阻率分布

本文提出了一种井间低频电磁波测量方法，用于重建地下介质电阻率分布。首先选择一个位于井轴上的垂直磁偶极子作为场源，并假设参与计算的介质相对于偶极子轴是轴向对称的，这样可将模型作为二维问题处理。文中每次进行迭代涉及的正演模拟把总场分为背景场和散射场两部分，背景场使用解析法计算。而散射场使用ＦＦＭ数值近似方法计算；在反演计算时使用正则化最小二乘拟合反演技术，从跨井电磁波测量资料中重现地下介质的电阻率剖面