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Lithium secondary battery manufacturing method

A lithium secondary battery and battery unit technology, applied in secondary battery, electrolyte battery manufacturing, electrode manufacturing, etc., can solve the problems of limited use, gas generation, SEI film instability, etc., and achieve the goal of promoting release and improving performance Effect

Active Publication Date: 2016-06-15
LG ENERGY SOLUTION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the SEI film of lithium secondary batteries may be unstable due to additives or organic solvents contained in the electrolyte, and although the SEI film can be stably formed, gas may be generated due to the decomposition of residual additives
[0010] Even in the case of using imide-based salts that can improve high-temperature storage properties and low-temperature output characteristics by minimizing the increase in the viscosity of organic solvents at low temperatures and increasing the mobility of lithium ions, there are still problems due to the possibility of corrosion. The use in lithium secondary batteries is severely limited

Method used

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Examples

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preparation example Construction

[0029] A method of manufacturing a lithium secondary battery according to an embodiment of the present invention includes performing a pretreatment in which an SEI film is formed on an electrode by immersing the electrode in a composition for forming an SEI film and applying a voltage to the electrode, the The composition includes a lithium salt, a non-aqueous organic solvent, and an SEI film-forming agent for forming an SEI film through an electrochemical redox decomposition reaction (step 1); and preparing an electrode assembly using an electrode having an SEI film formed thereon, the The electrode assembly is placed in the battery box, and the electrolyte injection and charging process is performed one or more times (step II).

[0030] According to the method for preparing a lithium secondary battery according to an embodiment of the present invention, the output characteristics and life characteristics of the lithium secondary battery can be further improved by the followin...

Embodiment 1

[0135] Step I: Preprocessing step

[0136]

[0137] The composition that is used to form positive pole is by 96% by weight as positive pole active material Li(Ni 0.33 co 0.33 mn 0.33 )O 2 , 2% by weight of carbon black as a conductive agent and 2% by weight of polyvinylidene fluoride (PVdF) as a binder were added to N-methyl-2-pyrrolidone (NMP) as a solvent. A 20 μm thick aluminum (Al) film as a positive electrode current collector was coated with the composition for forming a positive electrode and dried, and then the Al film was rolled to prepare a positive electrode.

[0138] In addition, the composition for forming the negative electrode was added by adding 96% by weight of carbon powder as a negative electrode active material, 3% by weight of PVdF as a binder, and 1% by weight of carbon black as a conductive agent to NMP as a solvent. while preparing. A 10 μm-thick copper (Cu) thin film as a negative electrode collector was coated with the composition for forming t...

Embodiment 2

[0157] A lithium secondary battery was prepared in the same manner as in Example 1, except that the electrolyte injection and charging steps of step II in Example 1 were only performed once as follows:

[0158] Step II: Electrolyte injection and charging step (single injection)

[0159] Step i) The first electrolyte injection step

[0160]

[0161] The first electrolyte is passed by adding 0.5ml of 1MLiPF as a lithium salt 6 And 1% by weight of 1,3-propane sultone as an additive was added to have a volume ratio of propylene carbonate (PC): ethylene carbonate (EC): ethylmethyl carbonate (EMC) of 3:3: 4, based on the total weight of the nonaqueous electrolyte solution.

[0162]

[0163] The electrode assembly was prepared by disposing a separator formed of three layers of polypropylene / polyethylene / polypropylene (PP / PE / PP) between the positive electrode prepared in step I and the negative electrode having the SEI film formed thereon, and The electrode assembly is placed i...

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Abstract

The present invention provides a lithium secondary battery manufacturing method comprising: a pretreatment step of forming a solid electrolyte interphase (SEI) membrane on an electrode by immersing the electrode in an SEI membrane formation composition containing a lithium salt, a non-aqueous organic solvent, and an SEI membrane formation agent capable of forming the SEI membrane by means of an electrochemical oxidation reaction or an electrochemical reduction reaction, and then applying voltage to the composition; and a step of using the electrode, having the SEI membrane formed thereon, so as to manufacture a battery assembly, putting the battery assembly into a battery case, and performing, at least once, a combined step of electrolyte injection and charging. According to the manufacturing method, the SEI membrane is formed on the electrode in advance by the electrode pretreatment, the electrode having the SEI membrane formed thereon is put into the battery case, and the electrolyte is injected, at least once, into the case in steps, and thus the output characteristics and lifetime characteristics of a lithium secondary battery can be further improved.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 2014-0131746 filed with the Korean Intellectual Property Office on September 30, 2014 and Korean Patent Application No. 2015-0124201 filed with the Korean Intellectual Property Office on September 2, 2015 , and its entire disclosure content is incorporated into this specification by reference. technical field [0003] The invention relates to a method for preparing a lithium secondary battery, which can simultaneously improve the output characteristics and life characteristics of the lithium secondary battery. Background technique [0004] Recently, with the development of the information and telecommunication industries, electronic devices are being miniaturized, lightened, reduced in thickness, and made portable. Therefore, there is an increasing demand for high-energy-density batteries used as energy sources for such electroni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCH01M10/058H01M4/0445H01M4/131H01M4/1391H01M10/049H01M10/052H01M10/0567H01M10/0568H01M10/0569H01M10/446H01M2300/0042Y02E60/10Y02P70/50H01M4/0404H01M4/0435H01M4/133H01M4/505H01M4/525H01M4/623H01M4/625H01M4/661H01M10/0525H01M10/4235H01M2004/027H01M2004/028H01M2220/20H01M2220/30
Inventor 俞成勋姜有宣李敬美
Owner LG ENERGY SOLUTION LTD
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