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Electrolyte solution for a lithium secondary battery and lithium secondary battery comprising the same

A lithium secondary battery and electrolyte technology, applied in secondary batteries, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as insufficient polymerization, reduced cycle performance, and many residual double bonds

Inactive Publication Date: 2013-05-15
SOULBRAIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the problem of lowering the cycle performance due to insufficient polymerizability of the acrylate monomer itself, resulting in many residual double bonds.

Method used

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  • Electrolyte solution for a lithium secondary battery and lithium secondary battery comprising the same
  • Electrolyte solution for a lithium secondary battery and lithium secondary battery comprising the same
  • Electrolyte solution for a lithium secondary battery and lithium secondary battery comprising the same

Examples

Experimental program
Comparison scheme
Effect test

manufacture example

[0085] Hereinafter, EC means ethylene carbonate, EMC means ethyl methyl carbonate, DEC means diethyl carbonate, DPHA means dipentaerythritol hexaacrylate, BMA means butyl methacrylate, HMA means hexyl methacrylate, HA means acrylic acid Hexyl ester, DPTA means dipentaerythritol tetraacrylate (dipentaerythritol tetraacrylate), TEGDA means tetraethylene glycol diacrylate (tetra(ethyleneglycol) diacrylate), PEGDA means polyethylene glycol diacrylate (poly(ethyleneglycol) diacrylate), in addition, PTA stands for trimethylolpropanetriacrylate (trimethylolpropanetriacrylate), VC stands for vinylene carbonate, ABVN stands for 2,2-azobis(2,4-dimethyl)valeronitrile (2,2-azobis(2, 4-dimethyl)valeronitrile).

[0086] Next, LiCoO is used as the anode active material 2 , using carbon black (carbonblack) as a conductive agent, using polyvinylidene fluoride (polyvinylidene fluoride, PVDF) as a binder, and using N-methyl-2-pyrrolidone (n-methyl-2-pyrrolidone, NMP) as a solvent. The slurry o...

Embodiment 1

[0097] Add 1.15M LiPF to the mixed solution of ethylene carbonate (EC), ethylmethyl carbonate (EMC) and diethyl carbonate (DEC) (the mixing volume ratio is EC / EMC / DEC=3 / 5 / 2) 6 And the mixed solution that obtains is gross weight, has added 3% by weight of dipentaerythritol hexaacrylate (DPHA) and 1% by weight of butyl methacrylate (BMA) as electrolyte additive, has added 200ppm of 2 as polymerization initiator ,2-Azobis(2,4-dimethyl)valeronitrile (ABVN) to prepare the electrolyte. An Al-pouch type lithium secondary battery was fabricated using the electrolytic solution prepared above and the prefabricated anode and cathode.

Embodiment 2 to 6

[0099] Lithium secondary batteries (E2A to E6A) were manufactured in the same manner as in Comparative Example 1 above except that the components and contents shown in Table 2 below were used.

[0100] 【Table 2】

[0101]

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Abstract

Provided are an electrolyte solution for lithium secondary battery, which includes dipentaerythritol hexaacrylate and a (meth)acrylate compound having a C4 to C12 linear or branched alkyl group as electrolyte additives, and a lithium secondary battery including the electrolyte solution. The electrolyte solution can improve the safety of the battery, and the performance characteristics, particularly cycle life characteristics, of the battery.

Description

technical field [0001] The present invention relates to an electrolytic solution for a lithium secondary battery capable of improving the safety and life characteristics of a lithium secondary battery, and a lithium secondary battery containing the electrolytic solution for a lithium secondary battery. Background technique [0002] In recent years, with the rapid development of electronic devices such as mobile phones and notebook computers, batteries with high energy density and excellent cycle life characteristics compared with existing nickel-metal hydride batteries (Ni-MH) and nickel-cadmium batteries (Ni-Cd) The application of lithium secondary batteries has grown rapidly. As applications of such lithium secondary batteries increase, improvements in safety and life performance and capacity of lithium secondary batteries are urgently required in order to ensure the safety of applied equipment and users. [0003] The average discharge voltage of lithium secondary batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/0565
CPCH01M10/0567Y02E60/122H01M10/0565H01M10/0569H01M10/0568H01M10/052Y02E60/10H01M10/0566
Inventor 金秀英韩知成沈银起崔智暎姜浣澈
Owner SOULBRAIN CO LTD