Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Lithium secondary battery comprising multilayered active material layer

A lithium secondary battery and active material technology, applied in the field of lithium secondary batteries, can solve problems such as lithium side reactions, and achieve the effects of improving initial efficiency, high power and high capacity

Active Publication Date: 2015-01-28
LG ENERGY SOLUTION LTD
View PDF5 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conversely, when the power characteristic of the negative electrode is greater than that of the positive electrode, lithium may not be inserted into the positive electrode and side reactions may occur

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 secondary battery comprising multilayered active material layer
  • Lithium secondary battery comprising multilayered active material layer

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0056] The preparation method of the positive electrode of the present invention comprises: on at least one side of the current collector, coating a slurry containing a lithium manganese oxide active material with a spinel structure and drying, thereby forming a first positive electrode active material layer; and A step of forming a second positive electrode active material layer by coating a slurry containing a layered lithium composite oxide active material on the surface of the first positive electrode active material layer and drying.

[0057] These slurries can be prepared by mixing an active material, a conductive agent, a binder, and the like in a predetermined solvent.

[0058]Usually, 1 to 20 weight percent of the above-mentioned conductive agent is added based on the entire weight of the mixture containing the positive electrode active material. As such a conductive agent, as long as it does not cause chemical changes in the battery and has conductivity, it is not pa...

Embodiment 1

[0079] Embodiment 1: the preparation of lithium secondary battery

[0080]

[0081] Mix 92% by weight of LiMn as the first positive electrode active material 2 o 4 , 4 weight percent of super-p as a conductive material and 4 weight percent of polyvinylidene fluoride as a binder, thereby preparing the first positive electrode active material slurry.

[0082] The above-mentioned first positive electrode active material slurry was die-coated on both sides of an aluminum (Al) thin film which is a positive electrode current collector with a thickness of about 20 μm, and dried to obtain a first positive electrode active material layer.

[0083] Under normal temperature conditions, the above-mentioned first positive electrode active material layer was dried for 20 minutes, and formed on the above-mentioned first positive electrode active material layer as the second positive electrode active material by nozzle spraying of the second positive electrode active material slurry The s...

experiment example 1

[0108]

[0109] In order to understand the initial efficiency of the lithium secondary batteries prepared in the above-mentioned Example 1, Comparative Example 1, Comparative Example 2 and Comparative Example 3, under the conditions of constant current / constant voltage (CC / CV) at a temperature of 25° C. The lithium secondary batteries prepared in Example 1 and Comparative Examples 1 to 3 above were charged to 4.15V and 0.05C, and then discharged to 2.5V at 1C under constant current (CC) conditions to measure the initial efficiency. The above-mentioned initial efficiency is a value obtained by dividing the first discharge capacity by the first charge capacity, and the results obtained therefrom are shown in Table 1 below.

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
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

A lithium secondary battery of the present invention may simultaneously improve high output and high capacity characteristics by including a first active material layer having high output characteristics and a second active material layer having high capacity characteristics respectively on a cathode collector and an anode collector.

Description

technical field [0001] The present invention relates to a lithium secondary battery including a multilayer electrode active material layer on a current collector. Background technique [0002] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has increased dramatically, in which high energy density and voltage, long cycle life, and low self-discharge rate Lithium secondary batteries are popularized and widely used. [0003] A lithium secondary battery refers to an electrode assembly in which a microporous separator is interposed between a positive electrode containing a positive active material that can store and release lithium ions and a negative electrode that contains a negative active material that can store and release lithium ions. Batteries with non-aqueous electrolytes. [0004] For example, lithium cobalt oxide (LiCoO 2 ), lithium manganese oxide (LiMn 2 o 4 ) or lithium nickel ox...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/131H01M4/583H01M10/052H01M4/13H01M4/139H01M4/48H01M4/525H01M4/587
CPCH01M4/505H01M4/5825Y02E60/122Y02T10/7011H01M2220/30H01M4/366H01M4/131H01M4/583H01M10/052H01M4/133H01M4/134H01M4/386H01M4/587H01M10/0525H01M2004/021H01M4/525Y02E60/10Y02T10/70H01M4/387
Inventor 金智善尹民浩申东析朴孝锡
Owner LG ENERGY SOLUTION LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com