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Lithium ion battery and electrolyte solution thereof

An electrolyte and lithium-ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems that cannot really improve the high-temperature storage performance of lithium-ion batteries, and achieve improved high-temperature storage performance, positive electrode protection, and small thickness expansion Effect

Active Publication Date: 2012-07-18
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The experimental results show that its storage performance at 75°C is good, but under more stringent test conditions, the oxidation of the electrolyte by the positive electrode will become a major factor, and only film formation on the surface of the negative electrode cannot really improve the lithium-ion battery. High temperature storage performance

Method used

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  • Lithium ion battery and electrolyte solution thereof
  • Lithium ion battery and electrolyte solution thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Electrolyte preparation: Mix ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and vinylene carbonate (VC) in a ratio of 35:30:30:5 (mass ratio) , then mix uniformly with 99 mass parts of this mixed solvent and 1 mass part of tetrabutyl titanate, add lithium hexafluorophosphate (LiPF 6 ), dubbed LiPF 6 Electrolyte with a concentration of 1mol / L.

[0029] The production of the positive electrode sheet: the positive active material lithium cobaltate (LiCoO 2 ), the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) in the N-methylpyrrolidone solvent system in a weight ratio of 96:2:2 are fully stirred and mixed uniformly, coated on the Al foil, and dried , cold pressing, and cutting into pieces to obtain positive pole pieces.

[0030] The production of the negative electrode sheet: the negative active material graphite, the conductive agent acetylene black, the binder styrene-butadiene rubber (SBR), and the thi...

Embodiment 2

[0034] Different from Example 1 is the preparation of electrolyte: diethyl carbonate (DEC), propylene carbonate (PC), dimethyl carbonate (DMC) and gamma-butyrolactone according to 40: 25: 30: 5 ( (mass ratio) ratio mixes, then with this mixed solvent of 90 mass parts and the tetraisopropyl titanate of 10 mass parts mix homogeneously, add lithium tetrafluoroborate (LiBF 4 ), made into an electrolyte with a LiBF4 concentration of 0.8mol / L.

[0035] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0037] The difference from Example 1 is the preparation of the electrolyte: methyl propyl carbonate (PMC), dipropyl carbonate (DPC), propylene carbonate (PC) and fluoroethylene carbonate (FEC) according to 40:25:30 : 5 (mass ratio) ratio mixing, then mix with this mixed solvent of 95 mass parts and the tetraethyl titanate of 5 mass parts, add lithium tetrafluoroborate (LiBF 4 ), dubbed LiBF 4 Electrolyte with a concentration of 1.2mol / L.

[0038] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to an electrolyte solution capable of improving the high temperature storage performance of a lithium ion battery. The electrolyte solution comprises a non-aqueous solvent, a lithium salt dissolved in the non-aqueous solvent and an additive. The additive is a compound represented by general formula (I), R1, R2, R3 and R4 are respectively and independently selected from alkyl containing 1-6 carbon atoms, alkenyl, naphthenic base containing 3-8 carbon atoms and aromatic base containing 6-12 carbon atoms, and the additive is 1wt%-10wt% of the electrolyte solution. Compared with electrolyte solutions in prior art, according to the electrolyte solution, titanate is subjected to oxidation reaction during initial charging process of the battery, and solid portions of oxidation products are covered on the surface of a positive pole to form a layer of compact passivation membrane, so that the positive pole is protected, the reaction between the positive pole and the electrolyte solution at a high temperature is prevented, the decomposing of the positive pole on the electrolyte solution is restrained, and the high temperature storage performance of the battery is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an electrolyte capable of improving the high-temperature storage performance of the lithium-ion battery, and a lithium-ion battery containing the electrolyte. Background technique [0002] Compared with other rechargeable batteries, lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, and low self-discharge. They have been widely used in various consumer electronics products, such as mobile phones, notebook computers, and MP3 players. [0003] With the improvement of the performance of consumer electronics products, the heat generated by mobile phones and notebook computers is gradually increasing, especially the heat generated by smart phones is generally greater than that of traditional feature phones. Lithium-ion batteries are used in high-temperature environments, and side reactions are prone to pro...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 王小梅付成华赵丰刚
Owner DONGGUAN AMPEREX TECH
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