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Electrode comprising electrode current collector of three-dimensional network structure

A technology of network structure and current collector, applied in the direction of electrode carrier/current collector, electrode current collector coating, structural parts, etc., can solve the problem that electronic conductivity and ionic conductivity cannot be obtained, and the miniaturization and thinning of batteries cannot be overcome. , the reduction of electrode strength and other issues, to achieve high output, shorten physical distance, and prevent the increase of internal resistance.

Active Publication Date: 2018-07-17
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even in this structure, the loading amount is still limited, the desired electron conductivity and ion conductivity cannot be obtained, there is a functional problem of decreased electrode strength due to the increase in the thickness of the electrode mixture layer, and the future required Restrictions on Miniaturization and Thinning of Batteries

Method used

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  • Electrode comprising electrode current collector of three-dimensional network structure
  • Electrode comprising electrode current collector of three-dimensional network structure
  • Electrode comprising electrode current collector of three-dimensional network structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Preparation of positive electrode

[0107] LiNi as the positive electrode active material 0.55 mn 0.30 co 0.15 o 2 , Denka black as a conductive material and polyvinylidene fluoride as a binder were mixed in a weight ratio of 96:2:2, and N-methylpyrrolidone (NMP) was added to the mixture to prepare a slurry material.

[0108] The slurry was coated on an aluminum felt having an average pore diameter of 20 μm, an aspect ratio of 100, and a thickness of 40 μm to obtain a unit positive electrode. The unit cathode was dried in a vacuum oven at 120 °C, and then two dried unit cathodes were laminated and rolled to prepare a cathode. Here, the thickness of the electrode including the current collector was 75 μm.

[0109] Preparation of lithium secondary battery

[0110] Lithium metal (40 μm) was adhered to a copper (Cu) foil as a counter electrode, a polyolefin separator was inserted between the positive electrode and the counter electrode, and then injected in ethyl...

example 2～4

[0112] A lithium secondary battery was prepared in the same manner as in Example 1 except that the average diameter of the pores of the current collector was changed as shown in Table 1.

Embodiment 5

[0114] A lithium secondary battery was prepared in the same manner as in Example 1 except that the thickness of the aluminum felt was changed to 55 μm, and the thickness of the electrode including the current collector was adjusted to 102 μm.

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Abstract

The present invention relates to an electrode for a secondary battery, in which two or more unit electrodes are stacked in a state of close contact with each other, wherein the unit electrodes adjacent to each other are electrically connected via an electrode mixture. In each unit electrode, the electrode mixture containing an electrode active material is introduced into a pore of a unit current collector having a three-dimensional network structure.

Description

technical field [0001] The present disclosure relates to an electrode including a current collector having a three-dimensional network structure. Background technique [0002] With the technological development of mobile devices and the increase in demand therefor, the demand for secondary batteries as energy sources is rapidly increasing. Among secondary batteries, lithium secondary batteries having high energy density, high operating voltage, long cycle life, and low self-discharge rate are commercially available and widely used. [0003] In addition, with increasing attention to environmental issues, electric vehicles (EVs), hybrid vehicles (HEVs) capable of replacing vehicles using fossil fuels, such as gasoline vehicles, diesel vehicles, etc., have been actively researched. Fossil fuels are one of the main causes of air pollution. As a power source for EVs and HEVs, interest in research and practical applications using lithium secondary batteries having high energy de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/74H01M4/139H01M4/04H01M10/0525
CPCH01M4/13H01M4/139H01M4/0435H01M4/661H01M4/806H01M2004/021H01M4/0404Y02E60/10H01M4/74H01M10/0525Y02P70/50H01M4/0471
Inventor 睦恩庚柳珉圭严仁晟
Owner LG ENERGY SOLUTION LTD
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