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Lithium secondary battery

A lithium secondary battery, non-aqueous electrolyte technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of battery performance degradation, expansion, high temperature cycle characteristics, high temperature storage capacity degradation, etc., to achieve improved degradation, excellent high temperature Effects of storage characteristics and excellent high-temperature cycle characteristics

Pending Publication Date: 2021-11-19
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of batteries applying lithium-nickel-cobalt-manganese-based oxides, during high-voltage driving, battery performance rapidly degrades due to side reactions between the positive electrode and electrolyte, and swelling occurs due to gas generation
In particular, the deterioration of high-temperature cycle characteristics and high-temperature storage capacity is serious

Method used

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  • Lithium secondary battery

Examples

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Embodiment approach

[0100] Hereinafter, the present invention will be described in detail with reference to embodiments. However, the embodiments of the present invention can be modified into other various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

Embodiment 1

[0103] (Preparation of non-aqueous electrolyte solution)

[0104] Dissolve LiPF 6 to 1.4 M, and then 1 g of propene sultone (PRS) and 1 g of fluoromalonate (difluoro)lithium borate (LiFMDFB) were added thereto as additives to prepare the nonaqueous electrolyte solution of the present invention (see Table 1 below).

[0105] (production of positive electrode)

[0106] In N-methylpyrrolidone solvent, the positive electrode active material (LiNi 0.5 co 0.3 mn 0.2 o 2 ), conductive material (carbon black) and binder (PVdF) were mixed in a weight ratio of 97:1.7:1.3 to prepare positive electrode slurry (solid content 70% by weight). The positive electrode slurry was applied to a positive electrode current collector (Al thin film) with a thickness of 10 μm, dried, and then rolled to produce a positive electrode (see Table 1 below).

[0107] (manufacture of negative electrode)

[0108] Negative electrode active material (graphite): conductive material (carbon black): binder (PV...

Embodiment 2

[0113] Manufacture pouch-type secondary battery in the same manner as Example 1, the difference is that, when preparing the non-aqueous electrolyte solution, use wherein ethylene carbonate (EC): fluoroethylene carbonate (FEC): biscarbonate Ethyl ester (DEC) was mixed in a weight ratio of 15:15:70 as the non-aqueous organic solvent (see Table 1 below).

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Abstract

The present invention relates to a lithium secondary battery, comprising: a cathode comprising a lithium nickel cobalt manganese-based oxide as a cathode active material; an anode comprising a carbon-based anode active material; a separator interposed between the anode and the cathode; and a nonaqueous electrolyte solution containing a lithium salt, an organic solvent, and an additive, wherein the organic solvent comprises 10 wt% or more of fluoroethylene carbonate and 20 wt% or less of ethylene carbonate, the additive comprises propene sultone and lithium fluoromalonato(difluoro)borate, and the lithium secondary battery has a driving voltage of 4.35 V or more.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2019-0036126 filed with the Korean Intellectual Property Office on March 28, 2019, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a lithium secondary battery capable of suppressing an increase in electrode resistance and gas generation when driven at a high voltage. Background technique [0004] Interest in energy storage technology has increased in recent years, and efforts to research and develop electrochemical devices have become more concrete as the technology's applications expand to mobile phones, camcorders, notebook computers, and even electric vehicles. . [0005] Among electrochemical devices, interest has been generated in the development of chargeable / dischargeable secondary batteries. In particular, lithium secondary batteries developed in the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M4/525H01M4/587H01M10/0525
CPCH01M10/0567H01M10/0525H01M10/0569H01M4/525H01M4/587H01M2300/0034H01M2300/0042Y02E60/10H01M2300/004H01M4/505H01M4/583H01M2004/027H01M2004/028H01M2300/0037
Inventor 李政旻林永敏李哲行
Owner LG ENERGY SOLUTION LTD
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