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Citation: HU Chuan-Yue, LI Xin-Hai, WANG Zhi-Xing, ZHANG Yun-He, HE Ze-Qiang. Electrochemical Behavior of Organic Electrolytes for Soft Package Lithium-ion Batteries[J]. Chinese Journal of Applied Chemistry, ;2005, 22(2): 158-163. shu

Electrochemical Behavior of Organic Electrolytes for Soft Package Lithium-ion Batteries

1.
School of Metallurgical Science and Engineering, Central South University, Changsha 410083

Corresponding author: HU Chuan-Yue,
Received Date: 5 March 2004
Available Online: 30 August 2004

Soft package lithium-ion batteries with graphite as anode and LiCoO₂ as cathode were prepared. The liquid electrolytes were composed of 1 mol/L LiPF₆ in various mixed solvents(by mass ratio):(ethylene carbonate(EC))/(dimethyl carbonate(DMC))/(γ-butyrolactone(GBL))(4:4:3)+4%(mass fraction) vinylene carbonate(VC), EC/DMC(1:1), EC/GBL(4:3) and EC/DMC/GBL(4:4:3). The electro-chemical behavior of each of the electrolytes was examined by measurements of vapor pressure, low temperature conductivity, oxidation potential, cycling performance and thickness change of soft package lithium-ion batteries during storage at 348 K or cycling at 298 K. The results exhibited excellent electrochemical behavior when the electrolyte consisted of 1 mol/L LiPF₆ EC/DMC/GBL(mass ratio 4:4:3)+4%(mass fraction)VC. Two oxidation potential shoulders were recorded on the linear sweep voltage curve, one shoulder was at 2.95 V vs Li/Li⁺ for VC and the other shoulder was at 4.62 V vs Li/Li⁺ for other mixed solvents. An SEI film with a very low impedance was formed. The soft package lithium-ion battery with the liquid electrolyte had a thickness of ca. 3.0 mm, with an energy density of 165 W·h/kg, capacity ratio of 89% after 200 cycles at 1 C rate and 298 K, 60% at 0.5 C rate and 255 K. The increment of thickness was less than 0.1 mm after being stored at 348 K and 4.2 V for 24 h.
- lithium-ion battery,
- soft package,
- liquid electrolyte,
- γ-butyrolactone,
- vinylene carbonate
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