Electrolyte for high multiplying power lithium ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems that the additive content is not easy to be too high, and the cycle performance of the battery is reduced, so as to reduce the migration force, improve the conductivity, and improve the rate. performance effect

Inactive Publication Date: 2009-11-25
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of additives in the above method is not easy to be too high, otherwise the cycle performance of the battery may be reduced

Method used

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  • Electrolyte for high multiplying power lithium ion battery and preparation method thereof
  • Electrolyte for high multiplying power lithium ion battery and preparation method thereof
  • Electrolyte for high multiplying power lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The first step carries out ternary mixing with cyclic carbonate solvent PC, EC and linear carbonate solvent DMC, wherein PC is 18% (wt), EC is 30% (wt), DMC is 52% (wt), by Combining vacuum drying method, distillation crystallization method, and 4A molecular sieve adsorption method to purify and remove water and impurities;

[0043] The second step is to add a certain amount of conductive lithium salt LiODFB to the above solvent at 20°C, and stir evenly to form an electrolyte solution with a concentration of 1.0mol / L;

[0044] In the third step, a certain amount of composite electrolyte salt tetraethylammonium tetrafluoroborate (purity>99.99%) is added to the electrolytic solution, and its concentration is 0.3 mol / L.

[0045] As mentioned above, the functional electrolyte solution for improving the rate performance of lithium-ion batteries of the present invention is prepared.

Embodiment 2

[0047]Same as Example 1, except that the solvent is 32% EC, 15% PC, 30% DMC, and 23% EMC by mass ratio.

Embodiment 3

[0049] Same as Example 1, except that the solvent is 33% EC, 37% DMC, and 30% EMC in mass ratio.

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Abstract

The invention relates to an electrolyte for a high multiplying power lithium ion battery and preparation method thereof. The electrolyte comprises conductive lithium salts, mixed carbonic ether solvent and additives. The carbonic ether solvent without water and impurity is mixed according to a quality ratio carbonic acid ethylene eater 10-35%, propene carbonate 0-20%, methyl carbonate 25%-60%, carbonic acid methyl ethylene ester 0-35%; the conductive lithium salts are dissolved in the solvent by 0.5mol / L-1.5mol / L, adding the functional additive R[4]NBF[4]; the concentration of the additive is 0.05mol / l-1.0mol / L; R[1] and R[2] are one or one of the methyl, ethyl, propyl, butyl and methoxyl ethyl. The method for adding the functional additive in the invention enhances conductivity of the electrolyte and reduces the interface resistance between the electrolyte and the electrode to enhance the moving speed for the lithium ion battery between the electrode and the electrolyte and the multiplying power performance for the lithium ion battery.

Description

technical field [0001] The invention relates to an electrolyte for a lithium ion battery and a preparation method thereof, in particular to a functional electrolyte for improving the rate performance of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become a hot spot in new energy research due to their advantages such as high working voltage, high energy density, no memory effect, and little environmental pollution. The positive and negative electrodes of lithium ion secondary batteries are composed of two different lithium ion intercalators. When charging, Li + It is released from the lattice of the positive electrode material, and embedded in the negative electrode material after passing through the electrolyte, and the positive electrode is in a lithium-poor state; when discharging, Li + Spontaneously detach from the negative electrode material and return to the lattice of the positive electrode material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/38
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 李劼赖延清张治安郝新
Owner CENT SOUTH UNIV
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