Lithium ion secondary battery and positive electrode thereof

A secondary battery, lithium ion technology, used in secondary batteries, battery electrodes, secondary battery repair/maintenance, etc., can solve the problems of aggravated oxidative decomposition of electrolyte, flatulence, deformation, etc., to improve high-temperature storage performance, weaken Oxidation reaction, the effect of improving storage performance

Active Publication Date: 2014-04-30
NINGDE AMPEREX TECH
View PDF4 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving the working voltage of lithium-ion secondary batteries is one of the effective ways to increase the energy density of batteries. However, with the high voltage of lithium-ion secondary batteries, the oxidation and d...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium ion secondary battery and positive electrode thereof
  • Lithium ion secondary battery and positive electrode thereof
  • Lithium ion secondary battery and positive electrode thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of the positive electrode of the lithium-ion secondary battery: First, lithium cobalt oxide, conductive agent SuperP, binder PVDF, (trifluoromethane) (perfluoro-n-propane) phosphate diester lithium salt in a mass ratio of 95.5: 2.0: 2.0: 0.5 Mix evenly to make lithium-ion secondary battery positive electrode slurry; then, evenly coat the positive electrode slurry on the positive electrode current collector aluminum foil, and the coating amount is 0.0194g / cm 2 , and after drying at 85°C, cold pressing is carried out; then, edge trimming, cutting, and slitting are carried out, and after slitting, dry at 85°C for 4 hours under vacuum conditions, and the tabs are welded to make lithium metal that meets the requirements. Ion secondary battery positive electrode.

[0022] Preparation of lithium-ion secondary battery negative electrode: First, uniformly mix graphite, conductive agent SuperP, thickener CMC, and binder SBR at a mass ratio of 96.5:1.0:1.0:1.5 to prepa...

Embodiment 2

[0025] The method for preparing lithium ion secondary battery with reference to embodiment 1, the difference between embodiment 2 and embodiment 1 is only: in embodiment 2, when preparing lithium ion secondary battery positive pole, use (trifluoromethane) (full Fluoro-n-heptane) phosphate diester lithium salt instead of (trifluoromethane) (perfluoro-n-propane) phosphate diester lithium salt in Example 1.

Embodiment 3

[0027] The method for preparing lithium ion secondary battery with reference to embodiment 1, the difference between embodiment 3 and embodiment 1 is only: in embodiment 3, when preparing lithium ion secondary battery positive pole, use two (perfluoro-n-pentane ) phosphoric acid diester lithium salt instead of (trifluoromethane) (perfluoro-n-propane) phosphoric acid diester lithium salt in Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Widthaaaaaaaaaa
Lengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a positive electrode of a lithium ion secondary battery. The positive electrode comprises a positive electrode current collector and positive electrode diaphragms distributed on the positive electrode current collector, wherein the positive electrode diaphragm contains a compound which can be separated from/inserted into lithium ions, a binder, a conductive agent and organic phosphate. The positive electrode of the lithium ion secondary battery contains organic phosphate and can effectively improve the interface of the positive electrode and an electrolyte, inhibit oxygenolysis of a non-aqueous electrolytic solution on the surface of the positive electrode and enhance high-temperature storage performance of the lithium ion secondary battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion secondary batteries. More specifically, the invention relates to a lithium-ion secondary battery and its positive electrode which can improve the positive electrode / electrolyte interface and further improve the high-temperature storage performance of the battery. Background technique [0002] Lithium-ion secondary batteries have the advantages of high operating voltage, long service life, and fast charging speed. Therefore, they have been widely used in various mobile electronic devices in recent years. However, with the continuous development of technology, people require lithium-ion secondary batteries to have higher energy density. Improving the working voltage of lithium-ion secondary batteries is one of the effective ways to increase the energy density of batteries. However, with the high voltage of lithium-ion secondary batteries, the oxidative decomposition of electrolyte at the positiv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/13H01M10/0525H01M10/42
CPCY02E60/122H01M4/131H01M4/628H01M10/0525Y02E60/10
Inventor 褚春波付成华赵丰刚王阿忠韩昌隆
Owner NINGDE AMPEREX TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap