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 Заголовок сообщения: Mechanism Analysis of VC Additives in Lithium Ion Batteries
СообщениеДобавлено: 14 май 2019, 19:22 

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Mechanism Analysis of VC Additives in Lithium Ion Batteries

Graphite is the mainstream anode material for lithium-ion batteries at present. The potential of lithium intercalation of graphite is close to that of metal Li, so it can give full play to the advantage of high voltage of lithium-ion batteries. But it also brings about a problem-the instability of electrolyte. At present, conventional carbonate electrolytes will be reduced and decomposed below 1.5V, such as the common EC solvent in electrolyte. The decomposition begins at about 1.2V (vs Li/Li+). The decomposition process of electrolyte consumes the active Li of lithium ion batteries. At the same time, an inert layer is formed on the surface of the negative electrode, which is commonly known as SEI film. The role of this inert layer is very important. Firstly, the existence of this inert layer can inhibit the further decomposition of electrolyte. Secondly, this inert layer can prevent the co-embedding of solvent molecules and Li+. Therefore, the SEI film formed on the negative surface of electrolyte has a very important impact on the performance and cycle life of lithium ion batteries.

In order to form a better SEI film, we usually add appropriate EC solvent in the electrolyte, and also need to add a small amount of film-forming additives, such as VC (vinylidene carbonate) is the most common SEI film-forming additive. Recently Sylvie Grugeon (first author) and Stephane Laruelle (correspondent author) of Amien University in France, et al., have added VC additives to lithium-ion batteries. The mechanism of action is analyzed in depth.

VC is one of the earliest electrolyte additives. Although people have done more research on VC additives, they still can not accurately grasp the specific reaction mechanism of VC additives. For example, according to theoretical calculation, the decomposition potential of VC additives is 0.57-1.21V (related to electrolyte system), but in fact, VC additives will begin to decompose at higher potential, so VC is in lithium ion. The mechanism of action in batteries needs further analysis.

Ni-Mh rechargeable battery

Ni-Cd rechargeable battery

Li-ion rechargeable battery

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