Cathode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery using same

A technology for cathode active materials and lithium secondary batteries, which can be used in secondary batteries, lithium batteries, battery electrodes, etc., and can solve problems such as small specific surface area

Active Publication Date: 2016-01-13
AEKYUNG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The cathode active material for a lithium secondary battery using non-graphitizable carbon and graphite in the prior art as described above is insufficient as a cathode active material that satisfies the conditions of a carbon material with a small specific surface area and excellent output characteristics.

Method used

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  • Cathode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery using same
  • Cathode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery using same
  • Cathode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery using same

Examples

Experimental program
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Effect test

preparation example Construction

[0078] 7) Preparation method and evaluation of charging and discharging characteristics of test battery

[0079] The detection cell (cell) is a button-type half-cell, which uses an electrode prepared with a cathode active material and a binder at a ratio of 97:3 and a lithium metal foil as a counter electrode, and a separator film is placed between them, As an organic electrolyte solution, an electrolyte solution in which 1M LiPF6 (lithium hexafluorophosphate) was mixed and dissolved with EC / DEC at a ratio of 1:1 was used, and this electrolyte solution was impregnated to prepare a 2016-type coin cell.

[0080] 8) Evaluation of charge and discharge characteristics

[0081] When charging, insert lithium ions into the carbon electrode according to the electrostatic current method at 0.1Crate (charge-discharge rate) until it reaches 0.005V, start from 0.005V, perform lithium ion intercalation according to the electrostatic current method and end lithium ion intercalation when the ...

Embodiment 1

[0085] Synthesis of Polyurethane Resin for Cathode Active Material

[0086] 100 g of a polyol (AKPSSP-104) containing 7 weight percent of hydroxyl groups and 175 g of 4,4'-MDI were stirred at 4000 rpm for 10 seconds to prepare a hardened polyurethane resin. After pulverizing the above-mentioned polyurethane resin with a crusher until the particle size reaches 0.1-2 mm, the temperature of the pulverized product is raised to 700° C. in a nitrogen atmosphere, and the pre-carbonization is carried out at 700° C. for 1 hour to obtain a lithium disulfide with a carbonization yield of 38%. Secondary battery cathode active material precursor. The obtained cathode active material precursor was pulverized by a jet mill until the average particle size reached about 6-12 μm, and the maximum particle size did not exceed 50 μm. The finely pulverized cathode active material precursor is put into a ceramic crucible, heated to 1200°C at a heating rate of 5°C / min in a nitrogen atmosphere, and m...

Embodiment 2

[0088] In Example 2, it implemented similarly to Example 1 except having set the carbonization temperature to 1300 degreeC and implemented.

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Abstract

The present invention relates to a negative electrode active material for a lithium secondary battery, to a method for manufacturing same, and to a lithium secondary battery using same, in which the negative electrode active material comprises carbides obtained by heat-treating a polyurethane resin in an active-gas atmosphere, and carbonizing the heat-treated resin, thereby reducing the specific surface area and thus relieving problems of moisture adsorption, improving initial charging / discharging efficiency of a secondary battery, and thus improving the energy density of the secondary battery and improving the characteristics of the battery, such as imparting a lengthened lifespan and improved charging / discharging output properties, high-temperature storage characteristics, etc. thereto.

Description

technical field [0001] The invention relates to a cathode active material for a lithium secondary battery and a preparation method thereof, and a lithium secondary battery using the same, more specifically, the present invention relates to a carbonization of polyurethane resin by heat treatment in an inert gas atmosphere, And prepare the negative electrode active material that comprises the carbide that obtains by described carbonization, thereby alleviate the problem of moisture adsorption with less specific surface area; Improve the initial charging and discharging efficiency of secondary battery, make the energy density of battery improve; And improve A cathode active material for a lithium secondary battery having battery characteristics such as life characteristics, charge and discharge output, and high-temperature storage characteristics, a preparation method thereof, and a lithium secondary battery using the same. Background technique [0002] With the recent trend of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M10/052C01B31/02H01M4/1393
CPCY02E60/10C01B32/318C01P2004/61C01P2006/40H01M4/587H01M10/0525
Inventor 李钟赫金善娥李钟旼李定茂金政坤
Owner AEKYUNG CHEM CO LTD
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