Influence of carbon black and binder on Li-ion batteries
Influence of carbon black and binder on Li-ion batteries
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DOI：
10.1016/s0378-7753(01)00481-5
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发表时间：
2001-10-01
影响因子：
9.2
通讯作者：
Thomas, JO
中科院分区：
文献类型：
--
作者：
Fransson, L;Eriksson, T;Thomas, JO
在一般的锂离子电池背景下，已经检查了不同组分如炭黑（CB）、粘合剂、集流体和锂盐的电化学响应。这些不同的成分，单独和不同的组合，对复合石墨阳极和LiMn 2 O 4阴极的影响进行了解决。发现CB电极在0.01 V和1.5 V之间以180 mAh/g的可逆容量循环，但不可逆容量为70%。将CB添加到石墨电极中的效果在第一循环不可逆容量和可逆容量方面被量化。在相同的电压范围内使用不同的粘合剂和电解质盐对CB电极进行循环伏安法测量。在使用EPDM或PVdF粘合剂之间可以看出明显的差异;在0.35 V下观察到PVdF粘合剂的额外还原反应。还在30-300 ℃的温度范围内检查了CB电极中这些粘合剂的热行为。阴离子在热稳定性方面的作用也从CB和石墨电极上的DSC测量中量化;对于CB和石墨电极，涉及SEI层反应的膨胀反应的起始温度对于LiBF 4明显低于LiPF 6（类似于110 ℃）（类似于60 ℃）。在阴极区域（3.0-5.5 V）的循环伏安法显示非氟化粘合剂CB和LiPF 6之间的氧化反应。这些反应可以通过改用LiBF 4来避免。在该电压区域中使用氟化和非氟化粘合剂的电化学响应显示出明显的差异。(C)2001 Elsevier Science B. V.保留所有权利。
The electrochemical response of different components such as carbon black (CB), binder, current collector and lithium salt have been examined in a general Li-ion battery context. The influence of these various components, alone and in different combinations, on composite graphite anodes and LiMn2O4 cathodes was addressed. CB electrodes were found to cycle with a reversible capacity of 180 mAh/g between 0.01 and 1.5 V, but with an irreversible capacity of 70%. The effect of adding CB to graphite electrodes was quantified in terms of first-cycle irreversible capacity and reversible capacity. Cyclic voltammetry measurements on CB electrodes were made in the same voltage region using different binders and electrolyte salts. A clear difference could be discerned between using EPDM or PVdF binder; extra reduction reactions were observed for the PVdF binder at 0.35 V. The thermal behaviour of these binders in CB electrodes was also examined in the temperature range 30-300 degreesC. The role of the anion in terms of thermal stability was also quantified from DSC measurements on both CB and graphite electrodes; the starting temperature for exothermal reactions involving SEI-layer reactions is clearly lower (similar to 60 degreesC) for LiBF4 than LiPF6 (similar to 110 degreesC) for both CB and graphite electrodes. Cyclic voltammetry in the cathodic region (3.0-5.5 V) showed oxidation reactions between non-fluorinated binders, CB and LiPF6. These reactions could be avoided by changing to LiBF4. The electrochemical response on using fluorinated and non-fluorinated binders in this voltage region showed clear differences. (C) 2001 Elsevier Science B.V. All rights reserved.