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Positive electrode, and secondary battery comprising positive electrode

A technology of positive electrode and positive electrode active material, applied in secondary batteries, batteries, positive electrodes, etc., can solve the problem of difficulty in obtaining electrical conductivity, and achieve the effects of ensuring electrical conductivity, improving output characteristics, and improving dispersibility

Pending Publication Date: 2020-08-25
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such nanoscale conductive materials are difficult to disperse smoothly in the positive electrode slurry, therefore, unless the content of the conductive material in the positive electrode active material layer exceeds an appropriate level, such as 1% by weight, it is difficult to obtain the desired conductivity

Method used

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  • Positive electrode, and secondary battery comprising positive electrode
  • Positive electrode, and secondary battery comprising positive electrode
  • Positive electrode, and secondary battery comprising positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Example 1: Manufacture of battery

[0079] (1) Preparation of conductive material dispersion

[0080] Bundle-type multi-walled carbon nanotubes in the form of pellets having a size of several centimeters, H-NBR as a dispersant, and NMP as a dispersion medium were mixed at a weight ratio of 4:0.8:95.2 to form a mixture. This mixture was added to a pin mill filled with 80% of beads having a size of 0.65 mm and dispersed, and then, the mixture was discharged at a discharge rate of 2 kg / min. This process was performed twice to prepare a conductive material dispersion liquid containing multi-walled carbon nanotubes whose particle size distribution was controlled.

[0081] (2) Manufacture of positive electrode

[0082] Using Li(Ni 0.6 mn 0.2 co 0.2 )O 2 as positive active material and PVdF as binder. The positive electrode active material, conductive material dispersion and NMP are mixed to prepare a solid content of 72% and wherein the weight ratio of the positive e...

Embodiment 2

[0087] Example 2: Manufacture of battery

[0088] (1) Preparation of conductive material dispersion

[0089] A conductive material dispersion, a positive electrode, and a battery were prepared in the same manner as in Example 1 except that, when the conductive material dispersion was prepared, the bead size was changed to 1 mm.

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Abstract

The present invention relates to a positive electrode and a secondary battery including the positive electrode, the positive electrode comprising a current collector and a positive electrode active material layer which is disposed on the current collector, wherein the positive electrode active material layer comprises a positive electrode active material, a binder and multi-walled carbon nanotubes, wherein the average length of the multi-walled carbon nanotubes is 1 mum to 2 mum, and the standard deviation of the lengths of the multi-walled carbon nanotubes is 0.5 mum or less.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0015313 filed with the Korean Intellectual Property Office on February 7, 2018, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a positive electrode and a secondary battery including the positive electrode, the positive electrode includes a current collector and a positive electrode active material layer disposed on the current collector, wherein the positive electrode active material layer includes a positive electrode active material, A binder and multi-walled carbon nanotubes, wherein the multi-walled carbon nanotubes have an average length of 1 μm to 2 μm and a standard deviation of lengths of 0.5 μm or less. Background technique [0004] In recent years, along with technological development and demand for mobile devices, demands for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/052
CPCH01M4/13H01M4/625H01M2004/028H01M10/0525Y02E60/10H01M10/052H01M4/0404H01M4/133H01M4/1393H01M4/38H01M4/623H01M2220/20
Inventor 柳正宇金叡隣金泰坤
Owner LG ENERGY SOLUTION LTD