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High rate electrolyte for lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of electrolyte, can solve the problems of low power, low conductivity, and low contribution of lithium-ion conductivity in lithium-ion batteries, and achieve the goal of improving rate discharge characteristics and increasing dissociation degree Effect

Active Publication Date: 2007-03-07
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high working voltage, the lithium ion battery uses the lithium salt solution of organic carbonate as the electrolyte. Compared with the aqueous solution, the conductivity of the organic solution is very low. The conductivity of the existing electrolyte is 10mS / cm. The contribution of conductivity is relatively low (60-70%), so the power of lithium-ion batteries is relatively low

Method used

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  • High rate electrolyte for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0022] In the environment of normal temperature and pressure, moisture content 1ppm, and an inert gas environment, a solvent with a purity of more than 99.95%, 22.6% ethylene carbonate, 5.7% propylene carbonate, 39.3% dimethyl carbonate, and 16.6% ethyl methyl carbonate were mixed. Uniformly, dissolve 13.3% lithium salt LiPF in this mixed solvent 6 , add in three times on average, the time interval between each addition is 1.5-2.0 hours, shake well after adding, and finally add 1.5% functional additive vinylene carbonate and 1.0% acetamide.

[0023] The electrolyte is filled into the battery for discharge characteristic detection, and the battery used is:

[0024] Positive electrode: active material LiCoO 2 The content of carbon black is 94%, carbon black is 3.0%, binder PVDF is 3.0%, and aluminum foil is the current collector. The width of the pole piece is 5.0cm, and the thickness is 147μm.

[0025] Negative electrode: the content of active material MCMB is 90.0%, the con...

Embodiment 2

[0039] With embodiment 1, just lithium salt LiPF 6 Change to LiAsF 6 , the functional additive acetamide was replaced by 12 crown ether 4 of crown ether, and the obtained electrolyte was tested for moisture, pH, and conductivity.

Embodiment 3

[0041] With embodiment 1, just lithium salt LiPF 6 Replaced with 10.0% LiAsF 6 and 3.3% LiBOB, the functional additive vinylene carbonate was replaced by carbon dioxide, and the functional additive acetamide was replaced by liquid ammonia, and the obtained electrolyte was tested for moisture, pH and conductivity.

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Abstract

This invention relates to lithium ion battery electrolyte with high times and discloses the main components as following: vinylene carbonate for 10 to 30 percentage; propylene carbonate for 4 to 20 percentage; dimethyl carbonate for 35 to 50 percentage; methyl carbonate for 10 t0 20 percentage; lithium salt for 12.5 to 16 percentage and B(OR)<3> with R representing carbon atoms less than 4 or crown ether of one or more function addictives for 0.1 to 5.0 percentage.

Description

technical field [0001] The invention relates to an electrolyte solution for a battery, in particular to a high rate discharge electrolyte solution for a lithium battery. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high specific energy, long cycle life, environmental friendliness and no memory effect. They have been developed rapidly and are widely used in portable electrical appliances. The positive electrode of the lithium-ion battery is a transition metal compound that can deintercalate lithium ions, and the negative electrode is a carbon material that can deintercalate lithium ions. Lithium ions escape from the positive electrode when the battery is charging, pass through the interface between the positive electrode and the electrolyte, the electrolyte, and the SEI film on the surface of the negative electrode, and then diffuse into the negative electrode body; when the battery is discharged, the lithium ions come ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/16H01M10/0567H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 刘建生左晓希贺云鹏周莉
Owner GUANGZHOU TINCI MATERIALS TECH
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