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Positive electorde for secondary battery and lithium secondary battery including the same

A technology for secondary batteries and positive electrode current collectors, which is applied in the direction of secondary batteries, secondary battery repair/maintenance, battery electrodes, etc., which can solve problems such as the inability to fully ensure battery stability, and achieve the effect of improving stability

Active Publication Date: 2019-08-09
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, this method is only used to periodically check the status of the battery, and may not sufficiently ensure the stability of the battery

Method used

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  • Positive electorde for secondary battery and lithium secondary battery including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] 40 parts by weight of LiFePO 4 Positive electrode active material, the carbon black of 10 weight parts as conductive agent, the carboxymethyl cellulose (CMC) of 3 weight parts and the polyethylene resin dispersion liquid of 47 weight parts are mixed in distilled water to prepare the first positive electrode active material slurry .

[0089] Additionally, 94 parts by weight of LiNi 0.6 mn 0.2 co 0.2 o 2 A positive active material, 3 parts by weight of carbon black as a conductive agent, and 3 parts by weight of PVdF as a binder were mixed in an N-methylpyrrolidone (NMP) solvent to prepare a second positive active material slurry.

[0090] A 20 μm thick water-based Al foil collector was coated with the first positive electrode active material slurry prepared above, and then dried to form a 10 μm thick first positive electrode active material layer. Subsequently, the second positive electrode active material slurry was coated on the first positive electrode active mat...

Embodiment 2

[0094] A positive electrode and a lithium secondary battery containing it were prepared in the same manner as in Example 1, except that 70 parts by weight of a polyethylene resin dispersion as a volume expansion resin and 17 parts by weight of LiFePO 4 positive electrode active material to prepare the first positive electrode active material slurry.

experiment example 1

[0102] Experimental Example 1: Overcharge Test

[0103] The overcharge test was performed by using the secondary batteries prepared in Examples 1 and 2 and Comparative Examples 1 to 3. Specifically, each secondary battery was charged at 0.3C to the full charge voltage (4.25V) and charged at 0.05C. Subsequently, each secondary battery was overcharged at 1C to a voltage of 6.4V after allowing each secondary battery to pass through a rest time of 3 hours to stabilize the voltage.

[0104] In this regard, figure 1 is a graph showing overcharge test results of lithium secondary batteries prepared in Examples 1 and 2 and Comparative Examples 1 to 3 of the present invention.

[0105] Such as figure 1 As shown, for the lithium secondary batteries prepared in Examples 1 and 2, it was confirmed that the voltage increased rapidly above 4.8 V, and therefore, it was considered that the overcharge termination voltage was reached quickly.

[0106] In particular, for Example 1, since the mi...

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Abstract

The present invention relates to an anode for a secondary battery for improving stability during overcharging and a lithium secondary battery including the same. Specifically, the anode is an anode including an anode active material layer formed on an anode current collector. The anode active material layer has a two-layer structure including a first anode active material layer formed on the anodecurrent collector and a second anode material layer formed on the first anode active material layer. The first anode active material layer includes a first anode active material, a conductive material, and a volumetric expansion resin in which volume expansion occurs at a high temperature upon overcharging, and the second anode active material layer includes a second anode active material.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 2017-0096436 filed with the Korean Intellectual Property Office on July 28, 2017, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a positive electrode for a secondary battery and a lithium secondary battery including the same. Background technique [0004] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has significantly increased, and among these secondary batteries, high energy density, high operating voltage, long cycle life and low self-discharge rate Lithium secondary batteries have been commercialized and widely used. [0005] Recently, with the use of lithium secondary batteries as power sources for medium and large devices such as electric vehicles, the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/42H01M4/62H01M4/58H01M4/525H01M4/505H01M10/052
CPCH01M4/505H01M4/525H01M4/366H01M4/5825H01M4/622H01M4/136H01M4/131H01M10/0525Y02E60/10H01M4/13H01M10/4235H01M4/62H01M10/052H01M4/0404H01M4/485H01M2004/028
Inventor 李京珉崔正锡金京旼吴松泽
Owner LG ENERGY SOLUTION LTD
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