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Secondary battery

A secondary battery and current collector technology, applied in secondary batteries, secondary battery repair/maintenance, lithium batteries, etc., can solve problems such as battery characteristic degradation, electrolyte side reactions, gas generation, etc., to improve life and safety , Improve electrical conductivity and increase battery capacity

Active Publication Date: 2020-08-14
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the case of using a linear conductive agent, the electrolyte side reaction occurs excessively due to the relative increase in the amount of the active material, thus inadvertently and excessively generating gas
Therefore, the characteristics of the battery are significantly deteriorated due to battery swelling or damage

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0057] Embodiment 1: the preparation of secondary battery

[0058] (1) Preparation of positive electrode

[0059] Use the average particle size (D 50 ) is 12μm Li[Ni 0.6 mn 0.2 co 0.2 ]O 2As the positive electrode active material, PVdF with a weight-average molecular weight of 900,000 g / mol was used as a binder, and bundled carbon nanotubes composed of (multi-walled) carbon nanotube units (with a specific surface area of ​​190m 2 / g) as a conductive agent, wherein the average diameter of the carbon nanotube unit is 12nm.

[0060] A conductive agent dispersion including multi-walled carbon nanotubes, hydrogenated nitrile rubber (H-NBR) and N-methylpyrrolidone (NMP, N-methylpyrrolidone) as a dispersion medium was prepared. Then, the positive electrode active material, PVdF, conductive agent dispersion and NMP were mixed to prepare a positive electrode with a solid content of 72% and a weight ratio of the positive electrode active material, carbon nanotubes, PVdF and H-NB...

Embodiment 2

[0070] Embodiment 2: the preparation of secondary battery

[0071] A secondary battery was prepared in the same manner as in Example 1, except that during the preparation of the electrolytic solution, tetravinylsilane was used in an amount of 0.40% by weight in the electrolytic solution.

Embodiment 3

[0072] Embodiment 3: the preparation of secondary battery

[0073] A secondary battery was prepared in the same manner as in Example 1, except that during the preparation of the electrolytic solution, tetravinylsilane was used in an amount of 0.02% by weight in the electrolytic solution.

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Abstract

The present invention relates to a secondary battery comprising: a cathode; an anode; a separator interposed between the cathode and the anode; and an electrolyte, wherein the cathode comprises a current collector and a cathode active material layer disposed on the current collector, the cathode active material layer comprising a cathode active material and a carbon nanotube, and wherein the electrolyte comprises a non-aqueous solvent, lithium salt, and tetravinylsilane.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0022065 filed with the Korean Intellectual Property Office on February 23, 2018, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a secondary battery comprising a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte solution, wherein the positive electrode includes a current collector and a positive electrode active material layer disposed on the current collector, the positive electrode The active material layer includes a positive electrode active material and carbon nanotubes, and the electrolyte solution includes a nonaqueous solvent, lithium salt, and tetravinylsilane. Background technique [0004] With the recent technological development and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0567H01M10/42H01M4/131H01M10/052H01M10/0568H01M4/525H01M4/505
CPCH01M10/052H01M10/0567H01M10/0568H01M4/505H01M4/525H01M4/131Y02E60/10H01M4/625H01M10/4235H01M2004/028H01M2004/021H01M10/0525H01M2300/0025
Inventor 白柱烈林永敏林俊默崔相勳李哲行
Owner LG ENERGY SOLUTION LTD