How do lithium ions migrate in ionic liquid electrolytes?

Until now, there is no a completely perfect, suitable electrolyte for lithium battery. Now the most commonly used is organic electrolyte, because of its high ion conductivity and wide temperature range.

The lithium battery new energy technology is running on the road to rapid, in modern society lithium battery than energy, security, has a more widespread attention. Anode materials for lithium batteries, are, electrolyte of innovation is the basic source to improve its performance.

Until now, has not been a completely perfect, suitable for lithium battery electrolyte. Now the most commonly used or organic electrolyte, because of its high ion conductivity and wide temperature range. Due to its easy to catch fire, cause safety accidents, so it is imperative to the development of new type of electrolyte. Development of novel electrolyte need a reliable theory to support, but because of the influence of the electrolyte involves more factors (such as viscosity, salt concentration, dissolved, ion association and ion - solvent interaction) for ion migration mechanism is still unclear. So, in the ionic liquid electrolyte, lithium ion is how to transfer?

Ionic liquid electrolytes,

Lithium ion battery is a kind of material is ionic liquid electrolytes. The definition of the ionic liquid is not yet clear, generally think it is entirely composed of cationic and anionic liquid, liquid at room temperature or near room temperature appears as organic salts. Ionic liquid has unique properties, including flammability, low vapor pressure, high heat stability, good electrochemical stability, low toxicity and high ion content, etc.

Usually, the ionic liquids can be divided into AlCl3 type ionic liquids, the AlCl3 type ionic liquid and special three kinds of ionic liquids. Various physical and chemical properties of ionic liquids can be found in the literature. In general, the viscosity of ionic liquids in higher than the liquid electrolyte to two orders of magnitude, so ionic conductivity is lower than the ionic conductivity liquid electrolyte for three to four orders of magnitude. Walden's law is usually used in the relationship between the conductivity and viscosity of ionic liquids, expressed as follows:

Lambda I is the ionic conductivity ion type I, mu is viscosity.

Because the viscosity is largely depends on the interaction between these factors, such as van der Waals interaction, conformation of freedom, the coulomb force and ion shape, such as scientific research personnel in the study of ionic liquids on the interactions between ionic substances have a lot of effort. In addition to low ionic conductivity, the applications of ionic liquid electrolytes, is unlikely to be in SEI layer is formed on the carbon anode materials, Li ion depletion in the loop. So, in many cases, the ionic liquids need auxiliary additives to used as electrolyte.

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