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Functional electrolytes to improve fast charging performances of lithium-ion batteries

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Title
Functional electrolytes to improve fast charging performances of lithium-ion batteries
Other Titles
리튬이온 이차전지의 고속충전 특성향상을 위한 기능성 전해액 연구
Author
Son, Hyebin
Advisor
Choi, Nam-Soon
Issue Date
2018-02
Publisher
Graduate School of UNIST
Abstract
Lithium-ion batteries have an outstanding property of high energy and power density, making it the useful tools of choice for portable electronics, energy storage system (ESS), and EVs. If EVs replace the majority petroleum transportations, it can reduce the greenhouse gas emissions significantly. According to environment problem and resource depletion, many countries are developing EVs even more. In EVs market, there are many important issues such as long cycle life of the battery, affordable price, safety and charging time. At this present, the gasoline is refueled in the car around 2min. But in the current circumstance, we still take a long time to charge the EVs. So, we must improve the charging performance for our convenience and saving time. There have been no studies so far in terms of electrolytes for fast charging enhancement. In this study, I demonstrated the dominating factors of the fast charging system. The first factor is the anode interface stabilization. The most important problem at the fast charging is the lithium plating, so anode additives should be applied to stabilize the negative electrode interface. I adopted the EC, VC, FEC as additives. I analyzed SEI components by XPS. Also, I discovered the difference of fast charging characteristic through the EIS and XRD measurements. The second factor is the cathode interface stabilization. The unstable interface will result in overpotential of the cell. Finally, the ionic conductivity of the electrolyte is one of the key factors in fast charging. The solvents in the electrolytes serve to transport lithium ions, and low viscosity and high transference number can make lithium ions move faster. It examined by means of GITT, rate capability test. Among these factors, I will talk about the effects of anode interface modification during fast charging and ionic conductivity depending on the solvent composition, which determines fast charging property by affecting lithium ion migration on the cathode side rather than on the anode side.
Description
Department of Energy Engineering (Battery Science and Technology)
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