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Non-aqueous electrolyte for lithium secondary battery and lithium secondary battery comprising same

A lithium secondary battery, non-aqueous technology, applied in secondary batteries, non-aqueous electrolytes, lithium batteries, etc., can solve the problems of reduced battery life and increased resistance, and achieve the effect of improving high-temperature durability

Pending Publication Date: 2021-11-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] PF formed in this way 5 It not only causes the decomposition reaction of organic solvents such as ethylene carbonate, but also destroys the solid electrolyte interphase (SEI) formed on the surface of the active material (such as graphite) whose operating voltage is outside the electrochemical stability window of the electrolyte, thereby causing Additional breakdown of the electrolyte and leads to increased resistance and reduced battery life

Method used

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  • Non-aqueous electrolyte for lithium secondary battery and lithium secondary battery comprising same
  • Non-aqueous electrolyte for lithium secondary battery and lithium secondary battery comprising same
  • Non-aqueous electrolyte for lithium secondary battery and lithium secondary battery comprising same

Examples

Experimental program
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Effect test

Embodiment 1

[0135] (Preparation of non-aqueous electrolyte for lithium secondary battery)

[0136] A compound represented by 0.5 g of formula 1a as a first additive, 1 0.0 g of difluorophosphate as a second additive and 0.1 g of tetravinylsilane as a third additive, 1.0 g sulfonate, 0.5 g 1, 3-propanesolane, 0.2 glibf 4And 6.0 g of fluorobenzene to dissolve 0.7M LiPF 6 And 0.3 m lifsi of 90.7 g organic solvent (ethylene carbonate: ethyl carbonate = 3: 7 volume ratio), the non-aqueous electrolyte of lithium secondary batteries was prepared.

[0137] (Secondary battery preparation)

[0138] Positive active material (Li (Ni) 0.8 CO 0.1 Mn 0.1 ) O 2 : Li (Ni 0.6 CO 0.2 Mn 0.2 ) O 2 = 7: 3% by weight, carbon black as a conductive agent and polyvinylidene fluoride as a binder added to N-methyl-2-pyrrolidone (NMP) as a solvent at a weight ratio of 97.5: 1: 1.5. Moisture to prepare a positive pole slurry (solid content: 50% by weight). The positive electrode slurry was applied with a 15 μm thick posi...

Embodiment 2

[0143] (Preparation of non-aqueous electrolyte for lithium secondary battery)

[0144] A compound represented by 0.2 g of formula 1a as a first additive, 1 0.0 g of diofluorophosphate, and 1.0 g of sulfonate as a third additive, 0.5 g of 1,3-propane sulture, 0.2g LIBF 4 And 6.0 g of fluorobenzene to dissolve 0.7M LiPF 6 And 0.3 m lifsi of 91.1 g of organic solvent (ethylene carbonate: ethyl carbonate = 3: 7 volume ratio), thereby preparing a non-aqueous electrolyte for lithium secondary batteries.

[0145] (Secondary battery preparation)

[0146] Positive active material (Li (Ni) 0.8 CO 0.1 Mn 0.1 ) O 2 , The carbon black as a conductive agent is added to N-methyl-2-pyrrolidone (NMP) as a solvent at a weight ratio of 97.5: 1: 1.5, to prepare a positive pulp (Solid content: 50% by weight). The positive electrode slurry was applied with a 15 μm thick positive electrode concentration fluid (Al film), dried and then rolled to prepare a positive electrode.

[0147] The negative electro...

Embodiment 3

[0151] (Preparation of non-aqueous electrolyte for lithium secondary battery)

[0152] A compound represented by 0.5 g of formula 1a as a first additive, 1 0.0 g of difluorophosphate as a second additive and 0.1 g of tetravinylsilane as a third additive, 1.0 g sulfonate, 0.5 g 1, 3-propanesolane, 0.2 glibf 4 And 6.0 g of fluorobenzene to dissolve 0.7M LiPF 6 And 0.3 M lifsi of 90.7 g of an organic solvent (ethyl carbonate: ethyl carbonate = 3: 7 volume ratio), the non-aqueous electrolyte of lithium secondary batteries was prepared.

[0153] (Secondary battery preparation)

[0154] Positive active material (Li (Ni) 0.8 CO 0.1 Mn 0.1 ) O 2 , The carbon black as a conductive agent is added to N-methyl-2-pyrrolidone (NMP) as a solvent at a weight ratio of 97.5: 1: 1.5, to prepare a positive pulp (Solid content: 50% by weight). The positive electrode slurry was applied with a 15 μm thick positive electrode concentration fluid (Al film), dried and then rolled to prepare a positive elect...

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Abstract

The present invention relates to a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery comprising the non-aqueous electrolyte, the non-aqueous electrolyte comprising: a lithium salt; an organic solvent; a compound represented by chemical formula 1 as a first additive; and lithium difluorophosphate as a second additive, wherein the weight ratio of the first additive and the second additive is 1:2 to 1:10.

Description

Technical field [0001] This application claims priority to Korean Patent Application August 21, 2019 No. 10-2019-0102521 filed, the disclosure of which is incorporated herein by reference. [0002] The present invention relates to a lithium secondary battery with a non-decomposed product-aqueous electrolyte solution and a lithium secondary battery, the non-aqueous electrolyte solution comprises a non-aqueous electrolyte additive, said additive having excellent non-aqueous electrolyte solution produced by the removal of the lithium salt effect, the lithium secondary battery having improved high-temperature storage characteristics and high-temperature life characteristics of the non-aqueous electrolyte solution comprising through. Background technique [0003] With the development of information society, personal IT equipment and computer networks have been developed, and the consequent increase in the overall social dependence on energy, the need to develop techniques for efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0091H01M2300/0017Y02E60/10H01M2300/0025H01M10/052C07D233/60
Inventor 金铉承安俞贺李哲行吴正友
Owner LG ENERGY SOLUTION LTD
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