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Method for preparing positive electrode active material for lithium secondary battery

A positive electrode active material and lithium secondary battery technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve problems such as side reactions, promote electrolytes, and reduce the safety of secondary batteries

Active Publication Date: 2016-01-20
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in this case, a large amount of gas is generated during the activation and charge-discharge processes, and thereby promotes side reactions of the electrolyte, thereby reducing the safety of the secondary battery

Method used

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  • Method for preparing positive electrode active material for lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Preparation of positive electrode

[0056] Will Li(Li 1.2 co 0.1 Ni 0.1 mn 0.6 )O 2 Used as positive electrode active material, will contain 2.0g of BF dissolved in it 4100ml of the solution was added to the positive active material and mixed. The mixed solution was heat-treated at 250° C. and then delithiated by washing with water and vacuum drying. Subsequently, a surface modification process was performed using mechanical milling, thereby preparing a cathode active material.

[0057] The prepared positive electrode active material, carbon black as a conductive material, and PVdF as a binder were added to N-methyl-2-pyrrolidone (NMP) in a weight ratio of 90:5:5, and mixed, thereby preparing a positive electrode mixture. On an aluminum foil having a thickness of 20 μm as a cathode current collector, the prepared cathode mixture was coated to a thickness of 40 μm, followed by pressing and drying. As a result, a positive electrode was prepared.

[0058] Prep...

Embodiment 2

[0064] A lithium secondary battery was fabricated in the same manner as in Example 1 except that heat treatment was performed at 300° C. during delithiation of the cathode active material.

Embodiment 3

[0066] A lithium secondary battery was fabricated in the same manner as in Example 1 except that heat treatment was performed at 400° C. during delithiation of the cathode active material.

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Abstract

The present invention provides a method for preparing a positive electrode active material for a lithium secondary battery, the method comprising: a step of pre-activation of at least one lithium transition metal oxide selected from compounds represented by chemical formula (1) below; and a step of surface modification of the pre-activated lithium transition metal oxide. (1-x)LiM'O2-yAy-xLi2MnO3-y'Ay'(1), wherein M' is MnaMb; M is at least one selected from the group consisting of Ni, Ti, Co, Al, Cu, Fe, Mg, B, Cr, Zr, Zn, and transition metals of period 2 in the periodic table; A is at least one selected from the group consisting of negative ions of PO4, BO3, CO3, F, and NO3; and 0 < x < 1, 0 < y <= 0.02, 0 < y' <= 0.02, 0.5 <= a <= 1.0, 0 <= b <= 0.5, and a + b = 1.

Description

technical field [0001] The invention relates to a method for preparing positive electrode active materials for lithium secondary batteries. Background technique [0002] As the technology of mobile devices continues to develop and the demand for them continues to increase, the demand for secondary batteries as an energy source is rapidly increasing. Among these secondary batteries, lithium secondary batteries exhibiting high energy density and operating potential and having long cycle life and low self-discharge rate are commercially available and widely used. [0003] In addition, as attention to environmental issues increases, electric vehicles (EVs), hybrid electric vehicles (HEVs), etc., which can replace vehicles using fossil fuels such as gasoline vehicles, diesel vehicles, etc. Research is actively underway. Nickel-metal hydride (Ni-MH) secondary batteries are mainly used as power sources for EVs, HEVs, and the like. However, research on lithium secondary batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M10/052H01M2/02
CPCC01G45/1228C01G45/1257C01G51/50C01G53/50C01P2002/50C01P2002/52H01M4/505H01M4/525H01M4/582H01M4/5825H01M10/052H01M2220/20Y02E60/10H01M4/485H01M4/58H01M10/0525H01M2220/30Y02P70/50
Inventor 金元贞河会珍金帝映
Owner LG ENERGY SOLUTION LTD
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