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Negative electrode and secondary battery including same negative electrode

A technology for negative electrodes and current collectors, applied in the field of negative electrodes and secondary batteries containing them, can solve the problems of electrode thickness thickening, achieve the effects of minimizing thickness changes, improving mechanical stability, and improving distribution

Active Publication Date: 2018-07-31
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above-mentioned problems are solved by using a method of increasing the porosity of the active material layer, to realize a high-capacity electrode with an active material layer having a high porosity, the electrode thickness needs to be thickened.

Method used

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  • Negative electrode and secondary battery including same negative electrode
  • Negative electrode and secondary battery including same negative electrode

Examples

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specific example

[0057] In addition, the positive electrode binder improves the adhesion between the positive electrode active material particles, and the adhesion between the positive electrode active material and the positive electrode current collector. The following can be specific examples of the positive electrode binder: polyvinylidene fluoride (PVDF), PVDF-co-HFP, polyvinyl alcohol, polyacrylonitrile, CMC, starch, hydroxypropyl cellulose, regenerated cellulose, poly Vinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, EPDM, sulfonated EPDM, SBR, fluororubber and its various copolymers, and one or at least two of the above adhesives can be used combination.

[0058] The separator separates the negative electrode from the positive electrode and provides a path for lithium ions, and the separator can be used without particular limitation as long as it is a separator commonly used in a secondary battery, and in particular, for ions A separator that has low resistance to mov...

Embodiment 1

[0068] Embodiment 1: the manufacture of battery

[0069] (1) Manufacture of negative electrode

[0070] 1) Formation of the first active material layer

[0071] By taking the mean diameter (D 50 ) of 20.4 μm artificial graphite, carbon black as a conductive material, and CMC and SBR as a binder were mixed at a weight ratio of 95.8:1:1.7:1.5 to manufacture 5 g of a mixture. Negative electrode slurry was produced by adding 28.9 g of distilled water to the mixture. A copper current collector with a thickness of 20 μm was coated with the negative electrode slurry and dried. At this time, the temperature of the circulating air was 120°C. Thereafter, by performing a rolling process, a first active material layer having a thickness of 50 μm was formed.

[0072] 2) Formation of the second pattern

[0073] By taking as the average diameter (D of the second pattern active material particle 50 ) of 15 μm, carbon black as a conductive material, and CMC and SBR as a binder were mixe...

Embodiment 2

[0080] Embodiment 2: the manufacture of battery

[0081] (1) Manufacture of negative electrodes and batteries

[0082] Instead of using the mean diameter (D 50 ) is 16 μm of natural graphite as the first active material particle, using the average diameter (D 50 ) is artificial graphite of 20 μm as the first pattern active material particles, and use the average diameter (D 50 ) of 15.6 μm artificial graphite as the second pattern active material particles, a negative electrode and a battery were manufactured in the same manner as in Example 1. At this time, the thickness of the first active material layer was 50 μm. In addition, the first pattern had a thickness of 40 μm and a porosity of 28%. In addition, the second pattern had a thickness of 20 μm and a porosity of 23%.

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Abstract

The present invention relates to a negative electrode and a secondary battery including the same, comprising: a current collector; a first active material layer, which comprises a first active material particle and is disposed on the current collector; and a first pattern and a second pattern, which are alternately arranged on the first active material layer while being spaced from each other, wherein the first pattern comprises a first pattern active material particle, the second pattern comprises a second pattern active material particle, the first pattern is thicker than the second pattern,and the second pattern has a volume expansion rate larger than that of the first pattern.

Description

technical field [0001] This application claims the priority and benefit of Korean Patent Application No. 10-2016-0083959 filed on July 4, 2016 and Korean Patent Application No. 10-2017-0085056 filed on July 4, 2017, which are incorporated by reference The invention is incorporated herein in its entirety. [0002] The present invention relates to a negative electrode and a secondary battery comprising the negative electrode, wherein the negative electrode may comprise a first active material layer, a first pattern and a second pattern, the thickness of the first pattern is greater than the thickness of the second pattern, And the volume expansion rate of the second pattern is greater than the volume expansion rate of the first pattern. Background technique [0003] Due to the rapid increase in the use of fossil fuels, there is an increasing demand for the use of alternative energy or clean energy, and in order to meet this demand, the most actively researched field is the fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/587H01M4/02
CPCH01M4/02H01M4/587H01M4/133H01M4/364H01M2004/021H01M4/1393H01M4/505H01M4/525H01M10/0525H01M10/058H01M2004/027H01M2004/028Y02E60/10Y02P70/50H01M4/131H01M4/1391H01M4/583H01M4/623H01M4/661
Inventor 郑慧利李廷弼
Owner LG ENERGY SOLUTION LTD
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