Anode active material for secondary battery, anode comprising same, and method for manufacturing same

A negative electrode active material, secondary battery technology, applied in secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of poor cyclic expansion and fast charging performance, weakening of electrode mechanical strength, electrode expansion, etc., to improve The effect of the cycle feature

Pending Publication Date: 2020-11-20
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when natural graphite is used as described above, the mechanical strength of the electrode becomes weak, and the cycle expansion and fast charging performance during charge and discharge are poor.
In this case, during charging and discharging, the electrodes may expand, causing problems such as shortened cycle life

Method used

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  • Anode active material for secondary battery, anode comprising same, and method for manufacturing same
  • Anode active material for secondary battery, anode comprising same, and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Preparation of negative electrode

[0105] The negative electrode was prepared using a negative electrode active material containing 80% by weight of artificial graphite and 20% by weight of spherical natural graphite. Specifically, natural graphite with a small particle size and uniform particle size is used for the negative electrode active material, and the natural graphite has a particle size distribution (D 50 ) is 11μm, D 90 5μm, D 10 6μm and D 90 -D 10 The average particle size is 9 μm. In addition, the tap density of spherical natural graphite was 1.15 g / cc (measured by performing 2000 taps using a tap density measuring instrument (TAP-2S manufactured by LOGAN)), and the electrode adhesion after roll pressing was 25gf / cm. As artificial graphite, the average particle size (D 50 ) is flake artificial graphite of 15.5 μm (tap density: 0.90 g / cc).

[0106] Natural graphite used as negative electrode active material, SuperC65 used as conductive material, st...

Embodiment 2

[0112] Preparation of negative electrode

[0113] The negative electrode was prepared using a negative electrode active material containing 80% by weight of artificial graphite and 20% by weight of spherical natural graphite. Specifically, natural graphite with a small particle size and uniform particle size is used for the negative electrode active material, and the natural graphite has a particle size distribution (D 50 ) is 9μm, D 90 13μm, D 10 6μm and D 90 -D 10 The average particle size is 7 μm. In addition, the tap density of the spherical natural graphite was 1.20 g / cc, so the electrode adhesion after rolling was 30 gf / cm. As artificial graphite, the average particle size (D 50 ) is flake artificial graphite (tap density: 0.93 g / cc) of 14.5 μm.

[0114] Natural graphite used as negative electrode active material, SuperC65 used as conductive material, styrene butadiene high component (SBR) used as binder and carboxymethyl cellulose (CMC) used as thickener were r...

Embodiment 3

[0119] Except using the negative electrode active material containing the artificial graphite of 85% by weight of Example 1 and the spherical natural graphite of 15% by weight of Example 1, negative electrodes and batteries (coin-type full cells and full batteries) were prepared in the same manner as in Example 1 half battery).

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Abstract

The present invention relates to an anode active material for a secondary battery, which has improved cycle swelling properties and rapid charge performance, an anode comprising same, and a method formanufacturing same. The anode active material is a mixture of artificial graphite and spherical natural graphite, wherein the spherical natural graphite has an average particle diameter (D 50) of 12um or less, with D 90-D 10 value ranging from 5 to 12um.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0163075 filed on December 17, 2018, and the entire content of this Korean Patent Application is incorporated herein by reference. [0002] The invention relates to a negative electrode active material for a secondary battery, a negative electrode containing the same, and a manufacturing method thereof. More particularly, the present invention relates to an anode active material having improved cycle expansion and high-rate filling performance, an anode, and a manufacturing method thereof. Background technique [0003] With rising energy prices due to the depletion of fossil fuels and increasing concerns about environmental pollution, the demand for environmentally friendly alternative energy sources has become an essential factor for future life. In particular, as the technology of mobile devices develops and the demand increases, the demand for secondary ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/133H01M10/0525
CPCH01M10/0525H01M4/587H01M4/133Y02E60/10H01M4/364H01M2004/021H01M2004/027
Inventor 崔希源金帝映禹相昱朴丽霖
Owner LG ENERGY SOLUTION LTD
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