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Study on the Dual-functional Electrolyte and Its Compatibility with LiFePO4-AC/AG-AC Capacitor Enhanced Battery Electrode Materials

Author: HaoXin
Tutor: LaiYanQing；ZhangZhiAn
School: Central South University
Course: Materials and Metallurgy
Keywords: Electrolyte Super capacitor battery Lithium ion secondary battery Electric double layer capacitor Compatibility
CLC: TM912
Type: Master's thesis
Year: 2010
Downloads: 273
Quote: 2
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Abstract


Super capacitor battery is a lithium ion secondary battery of both high energy density and high power density ultracapacitors advantage of new energy storage device, in transportation, mobile communications, information technology and other aspects is extremely important application prospect. As the electrolyte of the core components of the super capacitor battery capacity, resistance, life, temperature characteristic, the electrode / electrolyte interface, has an important impact on performance. For the first time to ultracapacitor electrolyte salt tetraethylammonium tetrafluoroborate (TEABF4) and lithium-ion batteries as an additive LiPF6 electrolyte salt compound to study the complex salt LiPF6-TEABF4 LiFePO4 cathode and electrolyte, artificial graphite (AG) with the negative Capacitive; then expand and optimize TEABF4 concentration of electrolyte solution, with LiFePO4/AG battery and the AC / AC capacitor means, and Two energy storage device to obtain a good compatibility with a composite salt \The electrolyte is preferably used in a dual-function type super capacitor battery LiFePO4-AC/AG-AC to study the electrochemical properties. The following conclusions: (1) LiFePO4/Li half-cell in LiPF6-TEABF4 composite salt electrolyte in the charge-discharge efficiency has reached 92%. View of the charge-discharge capacity, half-cell electrolyte solution in the A system, the initial discharge capacity is at 140mAh / g or more, slightly higher than the half-cell in the D system, initial discharge capacity of the electrolyte. Regardless of whether they contain the electrolyte PC, adding a certain amount of TEABF4 were to some extent, improve the battery charge and discharge capacity, indicating complex salt electrolyte LiPF6-TEABF4 LiFePO4 cathode material with good compatibility. (2) AG / Li battery electrolyte LiPF6-TEABF4 complex salt plays a high charge-discharge capacity and efficiency, add 0.1M TEABF4 A and reduces the conventional graphite anode electrolyte interfacial impedance between the first cathode polarization EIS Research and infrared spectroscopy can be found, 1.0V-0.5V is the potential range of SEI film is formed, the SEI film is below 0.5V repair phase, SEI film is the main component of ROCO2Li, Li2CO3, ROLi, etc.; adding 0.3M TEABF4 in D3 and electrolyte electrolyte A similar system can be obviously observed SEI film formation and repair, and the formation of the SEI film is a low impedance, TEABF4 improved AG containing the electrolyte and the negative electrode PC compatibility. (3) a certain amount of complex TEABF4 LiFePO4/AG not only improves battery charge and discharge capacity, to improve the rate and cycle characteristics of the battery, but also improves the AC / AC LiPF6 electrolyte capacitor charge and discharge capacitor. Integrated LiFePO4/AG battery and AC / AC capacitor performance considerations, EC-PC-DMC-EMC electrolyte solvent system composite 0.1M TEABF4 C1 has a better overall performance, LiFePO4/AG battery electrolyte in the average capacity of 423mAh , room temperature 25 ℃ and 65 ℃ under high temperature after 100 cycles, the battery capacity retention rate was 98.4% and 89.4%. AC / AC capacitor electrolyte in the charge-discharge curve showed a good linear relationship, after 1500 cycles capacitance of 2.4F. Preferably out both for the lithium ion battery and an electric double layer capacitor for the \EC-PC-DMC-EMC contrast, found that the super capacitor battery electrolyte in a dual function to play a higher discharge capacity (up 8.5%). In summary, this paper applies LiFePO4-AC/AG-AC bifunctional supercapacitor battery electrolyte; Its formula is 1.0 M LiPF6 0.1 MTEABF4/EC-PC-DMC-EMC.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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