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Cathode for secondary battery, method for manufacturing same, and lithium secondary battery including same

A secondary battery and positive electrode technology, which is applied in secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as the performance impact of lithium secondary batteries, and achieve high capacity and compensation capacity limitations , The effect of high lithium secondary battery

Pending Publication Date: 2020-12-04
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most conventional irreversible additives have a negative impact on the performance of lithium secondary batteries due to the reversible charge and discharge within the operating voltage range

Method used

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  • Cathode for secondary battery, method for manufacturing same, and lithium secondary battery including same
  • Cathode for secondary battery, method for manufacturing same, and lithium secondary battery including same
  • Cathode for secondary battery, method for manufacturing same, and lithium secondary battery including same

Examples

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preparation example Construction

[0041]

[0042] A method for producing the above-mentioned positive electrode for a lithium secondary battery of the present invention will be described.

[0043] The preparation method of the positive electrode for secondary batteries of the present invention comprises the following steps: forming a positive electrode material mixture layer comprising a positive electrode active material, and forming a coating comprising a lithium-based alloy on the positive electrode material mixture layer; The positive electrode formation of the active material and the lithium-based alloy uses the slurry to coat the positive electrode current collector and roll the positive electrode current collector to form the positive electrode material mixture layer.

[0044] figure 2 A method for forming a lithium-based alloy coating according to an embodiment of the present invention is schematically shown.

[0045] Such as figure 2 As shown, in the preparation method of forming a positive elec...

Embodiment 1

[0069] LiCoO 2 , carbon black and PVDF binding agent are mixed in the N-methylpyrrolidone solvent with the weight ratio of 95:2.5:2.5 to prepare the slurry for positive electrode formation, and one surface of aluminum current collector is coated with this slurry, at 130 °C, and then rolled to prepare the positive electrode material mixture layer.

[0070] Use Li-Al alloy (Li 50 atomic %, Al 50 atomic %) powder-coated cathode material mixture layer, make the weight ratio of positive electrode active material and Li-Al alloy be 95:5, then roll pressing to prepare to form on it coated positive electrode.

Embodiment 2

[0072] The positive electrode was prepared in the same manner as in Example 1, except that the weight ratio of the positive electrode active material to the Li-Al alloy was 90:10.

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Abstract

The present invention provides a cathode for a secondary battery including a cathode active material and a lithium-based alloy. In addition, the present invention provides a method for manufacturing acathode for a secondary battery, the method comprising: a step for forming a cathode mixture layer including a cathode active material, and forming, on the cathode mixture layer, a coating layer including a lithium-based alloy; or a step for forming a cathode mixture layer by applying, on a cathode current collector, slurry for forming a cathode including a cathode active material and a lithium-based alloy, and then pressing the slurry.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2018-0107294 filed with the Korean Intellectual Property Office on September 7, 2018, 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, a preparation method thereof, and a lithium secondary battery containing the positive electrode. Background technique [0004] Recently, with the rapid spread of electronic devices using batteries, such as mobile phones, notebook computers, and electric vehicles, the demand for secondary batteries having relatively high capacity as well as small size and light weight has rapidly increased. In particular, since lithium secondary batteries are lightweight and have high energy density, lithium secondary batteries have attracted attention as driving power sources for portable devices. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/131H01M4/139H01M4/04H01M10/052H01M10/44
CPCH01M4/131H01M4/382H01M4/366H01M4/134H01M4/1391H01M4/1395H01M4/0404H01M4/0435Y02E60/10H01M4/62H01M4/13H01M4/139H01M10/052H01M4/0459H01M4/0447H01M10/446H01M4/364H01M4/505H01M4/525H01M10/0525H01M2004/028
Inventor 金珠利金锡九金宣圭金永植宋周容金玄祐林英俊
Owner LG ENERGY SOLUTION LTD
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