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Lithium salt additives in the electrolyte what kind of role?

Number of visits: Date:2017-11-22 16:09:47
Source: Energy People Posted: 2017-08-07 09:26
 
 
Abstract: Electrolytes are generally composed of organic solvents, lithium salts and additives. At present, the most commonly used lithium salt is LiPF6. Although its thermal stability is poor, it is easily decomposed to form HF and corrode the SEI film, resulting in the deterioration of battery performance. Various new lithium salts are also emerging, but they still do not shake the position of LiPF6 in lithium salts.
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Lithium-ion batteries with high energy density, long-term cycle stability and other advantages become the most widely used power. Lithium-ion battery mainly by the positive, negative, diaphragm, electrolyte four major components. Electrolyte, as one of the most important components of Li-ion batteries, plays a role of transporting ions between positive and negative electrodes, and plays an important role in the performance of batteries.
 
The electrolyte is generally composed of organic solvents, lithium salts and additives. At present, the most commonly used lithium salt is LiPF6. Although its thermal stability is poor, it is easily decomposed to form HF and corrode the SEI film, resulting in the deterioration of battery performance. Various new lithium salts are also emerging, but they still do not shake the position of LiPF6 in lithium salts.
 
At present, the most common lithium salts are: LiPF6 (lithium hexafluorophosphate), LiBOB (lithium bis oxalate borate), LiBF4 (lithium tetrafluoroborate), LiODFB (lithium difluoro oxalate borate), LiTFSI Amine lithium), LiFSI (lithium bis (fluorosulfonyl) imide), LiPO2F2 (lithium difluorophosphate), LiFOP (lithium tetrafluoroborate oxalate) and the like. Among them, lithium salts other than lithium hexafluorophosphate are mostly used for additives. These lithium salts have their own characteristics:
 
LiBOB: higher conductivity, good film forming performance on graphite negative electrode, high temperature performance is good; low solubility, some low dielectric constant of the solvent is almost insoluble, and some positive poor compatibility;
 
LiBF4: not very sensitive to moisture, thermal stability than LiPF6 high, low HF content, low temperature performance; low conductivity, alone can not form a stable SEI membrane carbon negative electrode;
 
LiODFB: a combination of LiBF4 and LiBOB, excellent high temperature performance, excellent ionic conductivity over a wide temperature range and high solubility in chain carbonate solvents;
 
LiTFSI: higher conductivity than LiPF6, high thermal stability, decomposition temperature greater than 200 ℃, low temperature performance; corrosion of aluminum foil;
 
LiPO2F2: low solubility, good low temperature performance can improve high temperature performance.
 
Although these lithium salts can not be used as the main salt of the electrolyte, they perform well as a supporting agent (additive).


TypeInfo: Industry News

 

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