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首页> 外文期刊>Colloids and Surfaces, A. Physicochemical and Engineering Aspects >Charge inversion and colloidal stability of carbon black in battery electrolyte solutions
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Charge inversion and colloidal stability of carbon black in battery electrolyte solutions

机译：炭黑在电池电解液中的电荷转化和胶体稳定性

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We studied the influence of salt on a commercially available carbon black (Ketjenblack 600, KB) in carbonate solvents commonly applied in rechargeable batteries. Adopting the typically used salts: lithium hexa-fluorophosphate (LiPF6), lithium bis(trifluoromethane sulfonyl) imide (LiTFSI), as well as sodium hexafluorophosphate (NaPF6) dissolved in mixtures of ethylene carbonate and propylene carbonate, we investigated both the zeta potential and the flocculation kinetics of the KB particles as a function of salt concentration between 0.01 mM and 1.0 M. Clear evidence was found for the preferential adsorption of cations. In the absence of salt, KB was found to carry a negative surface charge, but this gets neutralized by Li+ at very low concentrations (similar to 1 mM), and by Na+ at intermediate concentrations (similar to 30 mM). In the case of lithium ions, the increased adsorption at higher concentration led to a recovery of the colloidal stability around 3-30 mM, depending on the anion. At high concentrations exceeding 30-100 mM, all salts cause flocculation of the KB particles, due to a reduction of the electric double layer thickness. Since the charge neutralization of the KB by Na+ takes place in the same concentration regime, no re-entrant stability is found for Na+. These findings could have implications in formulation protocols for semi-solid flow batteries, or other systems where an intermediate stable regime could assist mixing and/or structure formation at small length scales. (C) 2015 Elsevier B.V. All rights reserved.
机译：我们研究了盐对通常用于可充电电池的碳酸盐溶剂中市售炭黑（Ketjenblack 600，KB）的影响。采用通常使用的盐：六氟磷酸锂（LiPF6），双三氟甲烷磺酰基锂（LiTFSI）以及溶解在碳酸亚乙酯和碳酸亚丙酯混合物中的六氟磷酸钠（NaPF6），我们研究了Zeta电位和KB颗粒的絮凝动力学随盐浓度在0.01 mM和1.0 M之间的变化。发现了优先吸附阳离子的明确证据。在没有盐的情况下，发现KB带有负表面电荷，但是在极低浓度（约1 mM）下被Li +和在中等浓度（约30 mM）下Na +所中和。在锂离子的情况下，取决于阴离子，在较高浓度下增加的吸附导致胶体稳定性恢复到3-30 mM。在超过30-100 mM的高浓度下，由于双电层厚度的减小，所有盐都会导致KB颗粒絮凝。由于Na +对KB的电荷中和是在相同的浓度范围内进行的，因此未发现Na +的凹角稳定性。这些发现可能对半固态液流电池或其他系统的配方方案有影响，在这些系统中，中间稳定状态可以在小规模规模下协助混合和/或结构形成。 （C）2015 Elsevier B.V.保留所有权利。

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