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Electrolyte and its battery

A non-aqueous solvent and electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of safety problems, battery capacity decline, etc., to prevent battery performance decline, increase oxidation potential, and over-discharge cycle capacity keep improving

Active Publication Date: 2010-01-27
GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a decrease in battery capacity in this method, and these low-voltage active materials are easy to react with the electrolyte at high temperatures; the patent US20060147803 discloses the use of organic nitriles to form a passivation film on the surface of the copper current collector to increase the oxidation potential of copper, but this The method uses highly toxic nitrile compounds, and there are safety issues

Method used

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  • Electrolyte and its battery
  • Electrolyte and its battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of negative electrode: Mix carbon powder and polyvinylidene fluoride (PVdF) as a binder in a weight ratio of 90:10, and place the mixture in N-methylpyrrolidone (NMP) as a solvent to prepare negative electrode mixture slurry . The negative electrode slurry was uniformly coated on both sides of the negative electrode current collector copper foil with a thickness of 10 μm and dried, then compacted with a roller press, and cut into a desired shape.

[0044] Preparation of simulated battery: A porous polyethylene film is used as a separator, and a simulated battery is composed of the prepared negative electrode and metal lithium.

[0045] The non-aqueous solvent electrolyte additive of the present invention is injected into the simulated battery. The solvent used for the non-aqueous solvent electrolyte is a mixed solvent of ethylene carbonate (EC) and methyl ethyl carbonate (EMC) at a ratio of 3:7. LiPF 6 As a conductive salt, 3,5-bis(2-pyridyl)-1,2,4-triazo...

Embodiment 2

[0048] Preparation of negative electrode:

[0049] A negative electrode was fabricated by the same method as in Example 1.

[0050] Preparation of positive electrode:

[0051] 92% by weight of lithium-manganese composite oxide, 4% by weight of conductive agent carbon powder, and 4% by weight of binder polyvinylidene fluoride (PVdF) are added to the solvent N-methylpyrrolidone (NMP) to prepare the positive electrode Mixture slurry. The positive electrode slurry was uniformly coated on both sides of the positive electrode current collector aluminum foil with a thickness of 20 μm and dried, then compacted with a roller press, and cut into a desired shape.

[0052] A porous polyethylene film is used as a separator, and the positive and negative electrodes are stacked together in a wound structure. After the pole piece is wound, put it into a battery case with an outer diameter of 12mm and a height of 40mm, spot weld, inject the non-aqueous solvent electrolyte of Example 1, seal...

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Abstract

The invention relates to nonaqueous solvent electrolyte additive and a battery thereof, and belongs to the field of batteries. The nonaqueous solvent electrolyte additive comprises organic lithium salt shown by the chemical general expression 1 as follows: the chemical general expression 1 LiX, wherein, X is 3, 5-two substituent-1, 2, 4-triazole anion; substituent is selected form 2-pyridyl, 3-pyridyl and 4-pyridyl. The battery is composed of an anode, a cathode and electrolyte, wherein, the anode is used for adsorbing and releasing lithium; the cathode is used for adsorbing and releasing the lithium. Nonaqueous solvent electrolyte additive shown by the chemical general expression 1 is added into the electrolyte, and a protective film is formed on the surface of a liquid collecting body under the function of the nonaqueous solvent electrolyte additive and a cathode copper liquid collecting body, thus the oxidizing potential of copper is promoted, and the promotion of the potential of cathode copper can not overstep the oxidizing potential when the battery is overdischarged, thus the descension of the performance of the battery is prevented, and the descension is caused by the dissolution of the copper liquid collecting body. The maintenance of the overdischarge circulation volume of a lithium ion battery obtains remarkable improvement.

Description

technical field [0001] The invention relates to a non-aqueous solvent electrolyte and a battery thereof, belonging to the field of batteries, in particular to a non-aqueous solvent electrolyte capable of improving the over-discharge cycle life of a lithium-ion secondary battery and a lithium-ion battery using the electrolyte. Background technique [0002] Recently, with the rapid development of the mobile communication industry and the electronic information industry, there is an increasing demand for light-weight, high-capacity lithium-ion secondary batteries. In particular, lithium ion secondary batteries have a higher driving voltage and higher energy density than other conventional batteries. Portable electronic devices such as mobile phones, laptops, MP3 players or portable video players have become more popular than ever in recent years. The growing market demands batteries with higher energy density and lighter weight for these products. Recently, lithium-ion rechar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/056H01M10/0567
CPCY02E60/122Y02E60/10
Inventor 陈京才夏信德童叶翔
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD