Development of carbon conductive additives for advanced lithium ion batteries
Development of carbon conductive additives for advanced lithium ion batteries
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DOI：
10.1016/j.jpowsour.2010.07.002
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发表时间：
2011-04-01
影响因子：
9.2
通讯作者：
Grivei, Eusebiu
中科院分区：
文献类型：
--
作者：
Spahr, Michael E.;Goers, Dietrich;Grivei, Eusebiu
研究了新开发的导电炭黑c - energy (TM) Super C65和energy (TM) Super C45作为锂离子电池正极导电添加剂的性能，并与其他参考导电炭黑进行了比较。c - energy (TM) Super C45与LiCoO2粉末的干混合具有最低的体积电阻率和最高的压缩率。在丙酮分散液中进行高剪切力混合，将含LiCoO2的c - energy (TM) Super C65混合物的电阻率和压缩率提高到与c - energy (TM) Super C45混合物相同的水平。c - energy (TM) Super C45和LiCoO2的丙酮分散体表现出最低的粘度，这是由于炭黑的比BET表面积为45 m(2) g(-1)，是所有炭黑中最低的。c - energy (TM) Super C45在LiCoO2中的易分散性可以用飞行时间二次离子质谱表征其特殊的表面基团化学来解释。LiCoO2/炭黑混合物的体积电阻率与具有相关LiCoO2电极的半电池的高电流倍率性能一致。与所研究的炭黑相比，不同浓度的石墨导电添加剂c -能（TM） KS6L和c -能（TM） SFG6L在LiCoO2粉末中表现出更高的临界体积分数和更低的极限电阻率。在炭黑导电质量中加入其中一种石墨提高了电极密度，并且当石墨组分的浓度高于临界体积分数时，显著降低了LiCoO2电极质量的极限电阻率水平。(C) 2010 Elsevier B.V.版权所有
The newly developed conductive carbon blacks C-NERGY (TM) Super C65 and CNERGY (TM) 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 (TM) 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 (TM) Super C65 containing LiCoO2 mixture to the same level obtained for the C-NERGY (TM) Super C45 mixture in the same process. Acetone dispersions of C-NERGY (TM) Super C45 and LiCoO2 showed the lowest viscosities attributed to the carbon black's specific BET surface area of 45 m(2) g(-1) being the lowest of all carbon blacks studied. The easy dispersibility of C-NERGY (TM) 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 (TM) KS6L and C-NERGY (TM) 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. (C) 2010 Elsevier B.V. All rights reserved.