Gel-typed polymer electrolyte containing diacryl amide-based polymeric material and electrochemical device comprising the same

A technology of diacrylamide and gel polymer, which is applied in the manufacture of electrolyte batteries, hybrid capacitor electrolytes, non-aqueous electrolyte batteries, etc. It can solve the problems of battery thickness expansion, electrolyte leakage, and difficulty in impregnation

Active Publication Date: 2008-06-11
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is known to have the disadvantage that when the crosslinking agent is not fully cured and remains in the electrolyte, it is difficult to obtain uniform impregnation due to increased viscosity, thereby significantly reducing battery characteristics
[0005] In addition, secondary batteries containing such gel polymer electrolytes have problems related to deterioration of battery safety due to electrolyte leakage, since uniform distribution of the electrolyte into the electrode assembly cannot be achieved, after repeated charge / discharge cycles of the battery When , due to the precipitation of lithium metal from the anode, local expansion of the battery thickness occurs, resulting in electrolyte leakage (see Figure 1)

Method used

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  • Gel-typed polymer electrolyte containing diacryl amide-based polymeric material and electrochemical device comprising the same
  • Gel-typed polymer electrolyte containing diacryl amide-based polymeric material and electrochemical device comprising the same
  • Gel-typed polymer electrolyte containing diacryl amide-based polymeric material and electrochemical device comprising the same

Examples

Experimental program
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Embodiment 1

[0077] Preparation of non-aqueous electrolyte containing lithium salt

[0078] 1M LiPF 6 Added to a non-aqueous electrolyte solvent consisting of a mixture of ethylene carbonate (EC), ethylmethyl carbonate (EMC) and diethyl carbonate (DEC) (4:3:3, w / w). Based on the weight of the electrolyte, 1.5% by weight of vinylene carbonate (VC), 0.5% by weight of propylene sulfone (PS), 2 mol% of AIBN as a polymerization initiator, and 2% by weight of ethylenedipropylene represented by the aforementioned formula 3 An amide was added to the resulting mixture, thereby preparing a nonaqueous electrolyte.

[0079] Manufacture of cathode

[0080] Using LiCoO 2 As the cathode active material, 95.4% by weight of LiCoO with a particle size of 18 μm 2 , 1.6% by weight of Super-P (conductive material) and 3% by weight of PVDF (binder) as a cathode mixed material was added to NMP (N-methyl-2-pyrrolidone) as a solvent to prepare cathode slurry. Thereafter, the obtained cathode slurry was coa...

Embodiment 2

[0086] In addition to adding piperazine diacrylamide and polyethylene glycol diacrylate (Mn=700, Aldrich) in an amount of 2% by weight instead of ethylene diacrylamide, a secondary Battery.

experiment example 1

[0092] The batteries fabricated in Examples 1 and 2 and Comparative Examples 1 and 2 were charged to 4.2V at a charge rate of 1C, 50mA (off), and discharged to 3V (off) at a discharge rate of 1C. These charge / discharge cycles were repeated 500 times at room temperature. Meanwhile, in order to check the capacity of the battery, the manufactured battery was aged at room temperature for 5 days after its manufacture. Just after the battery capacity test, a cycle test is performed.

[0093] The changes in charge capacity and battery thickness of 300 to 500 cycles were measured respectively. The results thus obtained are shown in FIG. 2 .

[0094] As shown in Fig. 2, it can be seen that the batteries according to the present invention (Examples 1 and 2) exhibit almost comparable performance to that of the lithium-ion secondary battery (Comparative Example 2) even though it is a gel polymer battery system. The capacity of the lithium ion secondary battery of Comparative Example 2 ...

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Abstract

Provided is a gel polymer electrolyte comprising a diacrylamide compound as a precursor for formation of a crosslinked polymer. The gel polymer electrolyte in accordance with the present invention enables improvements of the battery safety by significant reduction of thickness swelling of the battery to thereby prevent the electrolyte leakage, while simultaneously preventing deterioration of charge-discharge rate characteristics and cycle characteristics which may occur upon use of a gel-type electrolyte.

Description

technical field [0001] The present invention relates to a gel polymer electrolyte containing a diacrylamide-based polymer material and a secondary battery comprising the electrolyte. More specifically, the present invention relates to a secondary battery that can achieve significantly reduced thickness swelling by introducing a specific diacrylamide-based polymer material into an electrolyte solvent, and that can also achieve improved battery safety by preventing electrolyte leakage from the battery. Battery. Background technique [0002] Technological development and increased demand for mobile devices has led to a rapidly increasing demand for batteries as an energy source. To cope with this trend, a great deal of research and development and research has been focused on batteries that can satisfy various requirements. Among them, there is a continuously increasing demand for lithium secondary batteries having high energy density, high discharge voltage, and excellent po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/10C08F20/56H01M10/40H01G9/035H01G11/54H01G11/56H01G11/62H01M10/0565H01M10/058
CPCH01M10/0565Y02E60/13H01M10/0525Y02E60/12H01M2300/0085H01M10/052H01G11/56Y02E60/10Y02P70/50H01M10/058
Inventor 柳秀英金银英成周桓金东明
Owner LG ENERGY SOLUTION LTD
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