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The new electrolyte additive can effectively improve the performance of lithium ion battery
2017-10-31
来源：转载自第三方
31 October 2017
With the rapid development of science and technology, the research on lithium ion battery in high current, high voltage, high energy density is particularly important. The energy density of lithium ion battery is determined by the battery capacity and the charge and discharge voltage, so a high voltage battery material system is required in order to increase the energy density of the battery. The addition of functional additives is the main direction of research on high voltage electrolyte. This article will introduce a new type of electrolyte additives, which can effectively improve the performance of electrode SEI film, thereby improving the performance of lithium-ion battery.
Lithium-ion battery electrolyte is composed of organic solvents, electrolyte lithium salt and functional additives. Adding a small amount of certain substances in the organic electrolyte, can significantly improve the performance of batteries, these small amount of material is called functional additives. Electrolyte functional additives have become a focus of today's lithium-ion battery research. At present, the research on the additive of Li-ion battery electrolyte is mainly focused on the following six aspects: improving the performance of electrode SEI film, improving the low temperature performance of electrolyte, improving electrolyte conductivity, improving electrolyte thermal stability, improving battery safety and cycle stability of electrolyte. Lithium carbonate (Li2CO3), lithium diborate lithium borate (LiBOB), VC, anisole and 12-crown-4 ether and other addictives have been found. But sometimes, a single additive is difficult to achieve the actual requirements.
Guo Mengya et al. [1] used 2,3-glycerol carbonate with terephthaloyl chloride, 1,3,5-trimesoyl chloride and 1,2,4,5-pyrometetracarboxylic acid esterification to product bis(2,3-cyclohexanediolate) terephthalate (TABE), tris(2,3-cyclohexanedioyl ester) trimellitate (BATE1) and tetra (2,3-cyclic carbonic acid glyceride)pyromellitic acid ester (BATE2), respectively.
The effects of these additives on the performance of lithium ion batteries were studied by means of magnification test, constant current charging and discharging test, AC impedance test and scanning electron microscopy. The results show that BATE2 can be used as electrolyte additive to form a dense and homogeneous SEI film on the graphite surface, which can effectively protect the electrode material, improve the cycle stability of the battery and improve the cycle efficiency of the battery. This may be due to the fact that the four carbonic acid ester groups on the benzene ring and the benzene ring can effectively improve the interface between the electrolyte and the spheroidized graphite to form a dense protective SEI film, limiting the additive and the organic solvent to the spherical graphite negative, thereby improving the performance of battery.
Adding a certain amount of additives to the electrolyte can significantly improve the safety and performance of lithium ion batteries. With the increase in the use of lithium-ion batteries, researchers need to continue to explore and develop electrolyte additives with more comprehensive and better performance to support the development of science and technology to meet people's needs.
References
[1] Guo Mengya, Zongchengxing, Ai Shujuan, et al. Synthesis and Application of New Types of Electrolyte Additives for Lithium Ion Battery, 2017, 38, 1857-1863.
Related links: LiBOB
Edited by Suzhou Yacoo Science Co., Ltd.
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