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Electrolyte of the lithium ion battery for ultra-low temperature discharge and its lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems that affect the performance and normal use of lithium-ion batteries, and cannot be discharged normally

Inactive Publication Date: 2007-08-15
HANGZHOU SKYRICH POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current lithium-ion battery has the problem of not being able to discharge normally when it is discharged at ultra-low temperature, which directly affects the performance and normal use of the lithium-ion battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The positive electrode active material lithium cobaltate (LiCoO 2 ), the binder polyvinylidene fluoride (PVDF) and the conductive agent carbon. These compounds were dispersed in N-methyl-2-pyrrolidone as a solvent at a weight ratio of 92:3:5 to form a positive electrode active material slurry. The slurry was coated on a 16 μm thick aluminum foil, dried and rolled to form a positive electrode.

[0013] Suspend and disperse negative electrode active material made of artificial graphite in carboxymethyl cellulose aqueous solution. Styrene-butadiene rubber (SBR) was added thereto as a binder, thereby forming a negative electrode active material slurry. The slurry was coated onto a 12 μm thick copper foil, dried and rolled to form a negative electrode.

[0014] The positive electrode and the negative electrode are wound or laminated together with a polyethylene separator with a thickness of 25 μm to form a battery core. Then the obtained cell body is packed into a metal ...

Embodiment 2

[0017] Repeat Example 1, the difference is that adding concentration is 1.0M (mol / liter) compound salt, and the ratio is LiPF 6 : LiBF 4 =9:1.

Embodiment 3

[0019] Repeat Example 1, the difference is that adding concentration is 1.0M (mol / liter) compound salt, and the ratio is LiPF 6 : LiBF 4 =15:1.

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Abstract

The related Li-ion cell fit to discharge at ultra-low temperature comprises an anode, a cathode, a membrane, and the electrolyte. Wherein, the electrolyte comprises: lithium hexafluorophosphate and lithium tetrafluoroborate with weight ratio as 1:5-10:1, and the solvent (including ethylene carbonate, dimethyl carbonate, methyl- ethyl carbonate, and dimethoxyethane). Wherein, the dimethoxyethane is 0.5-10wt%. Compared with prior art, this product can work well at -40deg.

Description

Technical field: [0001] The invention relates to an electrolyte solution of a lithium ion battery and a lithium ion battery composed of the same, belonging to the field of lithium ion batteries. Background technique: [0002] With the increasing popularity of portable electronic devices, such as mobile phones and notebook computers, higher requirements are placed on the corresponding power supply. Lithium-ion batteries are widely used in mobile electronic terminal products due to their light weight, high specific energy, high working voltage, long life, and low self-discharge. Since Japan's Sony Corporation first launched commercialized lithium-ion batteries in 1991, the lithium-ion battery industry has developed rapidly. Secondary lithium-ion batteries use two different compounds capable of reversibly intercalating / extracting lithium ions as positive and negative active materials. The lithium intercalation compound replaces the metal lithium negative electrode in the seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/16H01M10/36H01M10/0525H01M10/0568H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 金明钢陈刚沈垚
Owner HANGZHOU SKYRICH POWER CO LTD
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