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Lithium secondary battery

A lithium secondary battery and electrolyte technology, applied in secondary batteries, lithium storage batteries, batteries, etc., can solve the problems of increasing resistance and reducing the life performance of lithium secondary batteries, so as to improve battery life, excellent capacity performance, reduce effect of precipitation

Active Publication Date: 2015-01-14
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the thickness of the SEI layer in the negative electrode can be continuously increased to increase the resistance, the life performance of the lithium secondary battery can be reduced.

Method used

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Examples

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Embodiment approach

[0070] According to an exemplary embodiment of the present invention, the method may include: (a) a step of inserting an electrode assembly consisting of a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode into the battery case; (b) inserting After the composition of the gel polymer electrolyte is injected into the battery case, the step of polymerizing the composition to form an electrolyte.

[0071] In-situ polymerization in lithium secondary batteries may be performed by thermal polymerization. In this case, the desired polymerization time ranges from about 2 minutes to 12 hours, and the thermal polymerization temperature may range from 30°C to 100°C.

[0072] When polymerization-based gelation is performed, a gel polymer electrolyte is formed. Specifically, a gel polymer is formed in which polymerizable monomers are cross-linked with each other through a polymerization reaction, and the gel polymer...

Embodiment 1

[0095]

[0096] The electrolyte is passed through the LiPF 6 prepared by dissolving in a non-aqueous electrolyte solvent having a composition of ethylene carbonate (EC) and ethylmethyl carbonate (EMC) at a volume ratio of 1:2 to obtain LiPF 6 The concentration is 1M. The composition for gel polymer electrolyte is obtained by adding 5 parts by weight of polymerizable monomers (2.5 parts by weight of 2-cyanoethyl acrylate, and 2.5 parts by weight of bis(trimethylolpropane) tetraacrylate) and 0.25 parts by weight of tert-butyl peroxy-2-ethylhexanoate as a polymerization initiator, based on 100 parts by weight of the electrolyte solution.

[0097]

[0098] Positive electrode preparation

[0099] The positive electrode mixture slurry is prepared by the following method: 94% by weight of Li[Li 0.29 Ni 0.14 co 0.11 mn 0.46 ]O 2 , 3% by weight of carbon black (carbon black) as a conductive agent, and 3% by weight of polyvinylidene fluoride (PVdF) as a binder are added to ...

Embodiment 2

[0106] A coin-shaped secondary battery was prepared in the same manner as in Example 1, except that in preparing the composition for a gel polymer electrolyte of Example 1, 2-cyanoethoxyethyl acrylate was used to Instead of 2-cyanoethyl acrylate.

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Abstract

The present invention provides a lithium secondary battery comprising a positive electrode; a negative electrode; and gel polymer electrolyte, wherein i) the negative electrode includes a silicon-based negative active material, ii) the gel polymer electrolyte is formed by polymerizing a polymer including a monomer having a functional group capable of being coupled to metal ions, iii) and the charging voltage of the battery is in a range of 3.0 to 5.0 V. The lithium secondary battery according to the present invention can prevent the metal ions eluted from the positive electrode from moving to the negative electrode, and a metal from being precipitated in the negative electrode, thus improving the life cycle of the battery. Even if the battery is charged with a standard voltage as well as a high voltage, the battery has an excellent capacitance characteristic.

Description

technical field [0001] The present invention relates to a lithium secondary battery including a positive electrode, a negative electrode, a separator, and a gel polymer electrolyte, and more particularly, to a lithium secondary battery in which the negative electrode includes a silicon (Si)-based negative electrode active The material, the gel polymer electrolyte, is formed by polymerizing a composition including a monomer having a functional group that can bind to a metal ion, and the charging voltage of the battery ranges from 3.0V to 5.0V. Background technique [0002] Recently, with the trend of portable, miniaturized, lightweight and high-performance electronic equipment, the electronic equipment, information and communication industries have grown rapidly. Therefore, high-performance lithium secondary batteries are used as power sources of these portable electronic devices, and thus demand is rapidly increasing. A secondary battery that can be used repeatedly by charg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/587H01M4/525H01M4/505H01M10/0565H01M10/058H01M4/48H01M4/58
CPCY02E60/122H01M4/505H01M4/525H01M4/587H01M10/052H01M10/0565H01M10/058H01M2220/30Y02E60/10Y02P70/50H01M4/364H01M4/366H01M4/386H01M4/485H01M10/0525H01M2300/0085
Inventor 兪成勋姜有宣李敬美朴秦贤石正敦梁斗景
Owner LG ENERGY SOLUTION LTD
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