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Lithium ion battery and lithium ion battery electrolyte for ultralow temperature discharge

A lithium-ion battery and electrolyte technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problem of not fully disclosing the components and ratio of lithium-ion batteries, hindering the better development of lithium-ion batteries, and reducing the cost of lithium-ion batteries. Use surface and other issues to achieve the effect of facilitating rapid migration, improving low-temperature discharge performance, and ensuring low-temperature performance

Active Publication Date: 2013-10-16
HANGZHOU SKYRICH POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the low-temperature service limit of the lithium-ion battery produced by this method can reach minus 60°C, the overall performance of this type of lithium-ion battery is not reliable enough, and the composition and proportion of the lithium-ion battery are not fully disclosed in the invention
[0007] To sum up, there is currently no lithium-ion battery capable of ultra-low temperature discharge, stable performance, and excellent cycle performance, which reduces the use of lithium-ion batteries and hinders the better development of the lithium-ion battery industry

Method used

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  • Lithium ion battery and lithium ion battery electrolyte for ultralow temperature discharge
  • Lithium ion battery and lithium ion battery electrolyte for ultralow temperature discharge
  • Lithium ion battery and lithium ion battery electrolyte for ultralow temperature discharge

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The positive electrode active material lithium cobalt oxide (LiCoO 2 ), the binder polyvinylidene fluoride (PVDF) and the conductive carbon are combined, and these compounds are respectively dispersed in N-methyl-2-pyrrolidone as a solvent at a weight ratio of 92:3:5 to form a positive electrode active material The above slurry was coated on a 16 μm thick aluminum foil, dried and rolled to form a positive electrode. The negative electrode active material made of artificial graphite is suspended and dispersed in carboxymethyl cellulose aqueous solution, and styrene-butadiene rubber (SBR) is added as a binder to form a negative electrode active material slurry. The material was coated on a 12 μm thick copper foil, dried and rolled to form the negative electrode. The positive and negative electrodes are wound or laminated together with a polyethylene separator with a thickness of 25 μm to form a battery core, and then the resulting battery core is placed in a metal contai...

Embodiment 2

[0040] Example 1 was repeated except that 2 wt% triethoxyboron as an anion chelating agent and 8 wt% nitroethane as a low melting point additive were added to the mixture of quaternary solvent and lithium hexafluorophosphate.

Embodiment 3

[0042] Example 1 was repeated except that 1 wt% triethoxyboron as an anion chelating agent and 9 wt% nitroethane as a low melting point additive were added to the mixture of quaternary solvent and lithium hexafluorophosphate.

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Abstract

The invention relates to a lithium ion battery and a lithium ion battery electrolyte for ultralow temperature discharge. a lithium ion battery with the advantages of ultralow temperature discharge, stable performances and good cycle performance is not available at present. The invention is characterized in that the lithium ion battery electrolyte comprises lithium hexafluorophosphate, triethoxyboron, a low-melting-point additive and a quaternary solvent, wherein nitroethane and / or nitropropane is selected as the low-melting-point additive; the quaternary solvent consists of ethylene carbonate, DMC (dimethyl carbonate), ethyl methyl carbonate and dimethoxyethane; and the dimethoxyethane accounts for 0.8-10% of the total weight of the quaternary solvent. In the lithium ion battery electrolyte, the concentration of lithium hexafluorophosphate is 0.8-1.3mol / L, the mass percent of triethoxyboron is 0.2-8wt%, the mass percent of low-melting-point additive is 2-20wt% and the mass percent of quaternary solvent is 70-90wt%. The lithium ion battery is reasonable in structure design, can realize the ultralow temperature discharge, and has stable performances and good cycle performance.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte and a lithium-ion battery, in particular to a lithium-ion battery electrolyte and a lithium-ion battery for ultra-low temperature discharge, and belongs to the field of lithium-ion batteries. Background technique [0002] With the increasing popularity of portable electronic devices, such as mobile phones, notebook computers and other products, higher requirements are put forward for 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. [0003] 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 ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525
CPCY02E60/10
Inventor 陈刚金明钢韩改格
Owner HANGZHOU SKYRICH POWER CO LTD
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