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Lithium secondary battery

A lithium secondary battery, electrical connection technology, applied in the direction of secondary batteries, lithium storage batteries, battery electrodes, etc., can solve problems such as mechanical deformation, negative electrode or battery stability and life deterioration

Pending Publication Date: 2022-01-25
SK ON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the binder may cause mechanical deformation of the anode, and may also lead to deterioration of the stability and lifetime of the anode or battery

Method used

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  • Lithium secondary battery
  • Lithium secondary battery
  • Lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Li[Ni 0.88 Co 0.1 Mn 0.02 ]O 2 , carbon black as a conductive agent, and polyvinylidene fluoride (PVdF) as a binder were mixed in a weight ratio of 96.5:2:1.5 to prepare a positive electrode. The positive electrode slurry was uniformly coated onto an aluminum foil having a thickness of 12 μm, and then vacuum-dried and pressed at 130° C. to prepare a positive electrode for a lithium secondary battery.

[0094] Based on the total solid content of the negative electrode slurry, 8 parts by weight of silicon (Si), 1.5 parts by weight of an acryl-based binder, 0.5 parts by weight of carbon nanotubes (CNT) as a conductive agent, and 90 parts by weight of carbon-based Active materials are mixed to prepare negative electrode slurry. The negative electrode slurry was uniformly coated on a copper foil with a thickness of 8 μm, and then vacuum-dried at 130° C. and pressed to form a negative electrode.

[0095] The positive electrode and negative electrode obtained as described...

Embodiment 2

[0099] A secondary battery was manufactured by the same method as in Example 1, except that the binder content of the negative electrode slurry was changed to 2.5 parts by weight, the content of the carbon-based active material was changed to 89 parts by weight, and the positive electrode tabs and the negative electrode were changed to 89 parts by weight. The distance between the ears (D T ) is formed to 120mm.

Embodiment 3

[0101] A secondary battery was fabricated by the same method as in Example 1, except that the binder content of the negative electrode slurry was changed to 3.5 parts by weight, the content of the carbon-based active material was changed to 88 parts by weight, and the positive electrode tab and negative electrode were changed to 3.5 parts by weight. The distance between the ears (D T ) is formed to 185mm.

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Abstract

The invention discloses a lithium secondary battery, which includes an anode including an anode current collector and an anode active material layer formed thereon, the anode active material layer including an acryl-based binder; a cathode facing the anode; an anode tab electrically connected to the anode; and a cathode tab electrically connected to the cathode. A content of the acryl-based binder and a distance between the cathode tab and the anode tab satisfies a predetermined relation to provide the lithium secondary battery having improved mechanical stability and battery performance.

Description

[0001] CROSS-REFERENCE AND PRIORITY CLAIMS OF RELATED APPLICATIONS [0002] This application claims priority to Korean Patent Application No. 10-2020-0091043 filed with the Korean Intellectual Property Office (KIPO) on Jul. 22, 2020, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to lithium secondary batteries. More particularly, the present invention relates to a lithium secondary battery having improved stability and lifespan characteristics. Background technique [0004] With the development of information technology and display technology, rechargeable and dischargeable secondary batteries have been widely used as power sources for mobile electronic devices such as camcorders, mobile phones, and notebook computers. Recently, a battery pack including a secondary battery has also been developed and applied to an eco-friendly automobile such as a hybrid vehicle as its power source. [0005] Second...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M50/533H01M50/536
CPCH01M10/0525H01M4/13H01M4/139H01M50/536H01M50/533H01M4/134H01M2004/027H01M4/133H01M4/364H01M4/366H01M4/386H01M4/48H01M4/587H01M4/622H01M50/105Y02E60/10Y02P70/50H01M10/058H01M4/621H01M50/531H01M10/052
Inventor 裵芝希金正焕李容锡闵载鈗裵相元李明鲁
Owner SK ON CO LTD
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