Negative electrode for secondary battery

A technology of negative electrode and current collector, applied in the field of negative electrode for secondary battery, can solve the problems of deterioration of negative electrode performance, electrode corrosion, insufficient positioning of active material, etc., and achieve the effect of improving charging performance

Active Publication Date: 2018-06-08
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the above method is used, the active material excellent in charge / discharge capacity cannot be sufficiently localized on the surface of the negative electrode, and thus, lithium ions cannot be smoothly diffused.
Therefore, the improvement of charging performance is limited, and the electrode is corroded due to side reactions on the surface of the negative electrode, or by-products are generated on the surface thereof, thereby deteriorating the performance of the negative electrode

Method used

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  • Negative electrode for secondary battery
  • Negative electrode for secondary battery
  • Negative electrode for secondary battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0052] Preparation of Artificial Graphite with Tuned Li-ion Diffusion Rate and Orientation Index

[0053] Coal-based pitch and petroleum-based pitch were mixed, then dissolved in THT to prepare a mixed pitch solution, and the mixed pitch solution was evaporated to prepare mixed pitch. Subsequently, the mixed pitch is calcined to prepare the average particle size (D 50 ) is a secondary particle of 19 μm, and the secondary particle is graphitized at a temperature of 2,800 ° C, thereby completing a lithium ion diffusion rate of 1.69×10 -8 cm 2 / s and the preparation of artificial graphite with an orientation index of 13.

Embodiment 1 and comparative example 1 to 4

[0054] Example 1 and Comparative Examples 1 to 4: Preparation of Negative Electrodes

Embodiment 1

[0056] (1) Preparation of the first active material layer

[0057] The lithium ion diffusion rate of 95.6% by weight of the first active material particles as the first active material layer is 5.88×10 -9 cm 2 / s of natural graphite, 1.0% by weight of carbon black (Super C65) as a conductive material, 2.3% by weight of SBR as a binder, and 1.1% by weight of CMC are added to distilled water to prepare for forming the first active Material layers of paste. The slurry for forming the first active material layer was applied on a copper foil with a thickness of 20 μm as a negative electrode current collector, dried and rolled, thereby completing the first active material layer with a thickness of 60 μm on the current collector. Formation of material layers (see figure 2 (a) of 210).

[0058] (2) Fabrication of the second active material layer and negative electrode

[0059] 95.6% by weight of the artificial graphite prepared according to Preparation Example 1 as the second act...

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Abstract

Provided herein are a negative electrode and a secondary battery including the same. In particular, the negative electrode includes: a current collector; a first active material layer including firstactive material particles and disposed on the current collector; and a second active material layer including second active material particles and disposed on the first active material layer, in whicha lithium ion diffusion rate of the second active material particles is two to three times that of the first active material particles.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of priority from Korean Patent Application No. 10-2016-0084358 filed with the Korean Intellectual Property Office on Jul. 4, 2016, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a negative electrode and a secondary battery comprising it, wherein the negative electrode may include first and second active material layers, and the lithium ion diffusion rate of the active material particles of the second active material layer is the first active material. The material layer has two to three times the active material particles. Background technique [0004] Due to the rapid growth in the use of fossil fuels and the increasing need to use alternative or clean energy sources, research is most actively conducted in the field of power generation and energy storage using electrochemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/36H01M4/587H01M4/62H01M2/10H01M4/02
CPCH01M4/133H01M4/587H01M4/622H01M2004/021H01M2220/20H01M4/366Y02E60/10H01M2220/10H01M2004/027H01M50/20H01M4/62Y02T10/70H01M4/625H01M10/0525
Inventor 李赫武李松叶吴松泽
Owner LG ENERGY SOLUTION LTD
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