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Lithium ion secondary battery and electrolyte solution thereof

A secondary battery and electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of deterioration of battery cycle performance, increase of battery impedance, failure to meet the use requirements, etc., to improve storage performance and inhibit oxidation Decompose and improve the effect of the interface

Active Publication Date: 2013-05-01
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some people use maleimide containing imide functional groups to improve the high-temperature storage performance of batteries (voltage 4.2V), but maleimide additives still cannot meet the requirements of higher voltages (4.4V and higher voltages). ) battery requirements; in addition, pure olefin additives are also used to improve the high-temperature storage characteristics of the battery, but pure olefins will form a film and cause the impedance of the battery to increase, causing the cycle performance of the battery to deteriorate

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Preparation of lithium-ion secondary battery cathode sheet: Lithium cobalt oxide, conductive agent SuperP, and binder PVDF are mixed uniformly at a mass ratio of 96:2.0:2.0 to make a lithium-ion secondary battery cathode slurry with a certain viscosity, and coated On the current collector aluminum foil, the coating amount is 0.0194g / cm 2 , after drying at 85°C, cold pressing; then trimming, cutting, and slitting, drying at 85°C for 4 hours under vacuum conditions, welding the tabs, and making a lithium-ion secondary battery positive electrode that meets the requirements piece.

[0023] Preparation of lithium-ion secondary battery negative electrode sheet: graphite, conductive agent SuperP, thickener CMC, and adhesive SBR are prepared into a slurry at a mass ratio of 96.5:1.0:1.0:1.5, coated on the current collector copper foil and Dried at 85°C, the coating weight is 0.0089g / cm 2 ; After trimming, cutting, and slitting, dry at 110° C. for 4 hours under vacuum conditio...

Embodiment 2

[0027] The lithium ion secondary battery was prepared with reference to the method of Example 1, except that when preparing the lithium ion secondary battery electrolyte, the additives were: 1,3-propane sultone (PS) with a mass percentage content of 3% and mass The percentage content is 1% N-allyl succinimide.

Embodiment 3

[0029] The lithium ion secondary battery was prepared with reference to the method of Example 1, except that when preparing the electrolyte solution for the lithium ion secondary battery, the additive was: N-allyl succinimide with a mass percent content of 1%.

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Abstract

The invention discloses a lithium ion secondary battery and an electrolyte solution thereof. The electrolyte solution is composed of lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises one of or two of N-olefin imide and N-alkynes imide. Compared with the prior art, the additive in the electrolyte of the lithium ion secondary battery can effectively improve a positive / electrolyte interface to restrain the oxygenolysis of the electrolyte on the positive surface, so that the storage performance of the lithium ion secondary battery at a high temperature is remarkably improved.

Description

technical field [0001] The invention relates to a lithium-ion secondary battery, in particular to a lithium-ion secondary battery electrolyte capable of improving the high-temperature storage performance of the battery. Background technique [0002] Lithium-ion secondary batteries have the advantages of high operating voltage, long life, and fast charging speed. However, with the continuous development of technology, people require lithium-ion secondary batteries to have higher energy density. Studies have found that increasing the working voltage of lithium-ion secondary batteries is one of the effective ways to increase their energy density. However, with the high voltage of lithium-ion secondary batteries, the oxidation and decomposition of the electrolyte at the positive electrode intensify, and the batteries are stored at high temperatures. Sometimes there will be flatulence problems due to the oxidative decomposition of the electrolyte. [0003] Generally, in a charge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0567
CPCY02E60/122Y02E60/10
Inventor 褚春波付成华赵丰刚王阿忠韩昌隆
Owner NINGDE AMPEREX TECH
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