High molecular electrolyte and lithium cell

A technology of polymer electrolyte and lithium battery, applied in the field of lithium battery

Inactive Publication Date: 2002-04-24
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the explosion hazard of lithium secondary batteries, achieving safety is of paramount importance.

Method used

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  • High molecular electrolyte and lithium cell
  • High molecular electrolyte and lithium cell
  • High molecular electrolyte and lithium cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 4 g of polyethylene glycol having a molecular weight of 400 and 4.205 g of hexamethylene diisocyanate were reacted at 65° C. to prepare a prepolymer having a polyethylene oxide main chain and NCO end caps. Here, 0.092 g (approximately 1% by weight) of dibutyltin dilaurate was used as catalyst.

[0051] Subsequently, 0.085 g of prepolymer was mixed with 0.077 g of glycerol ethoxylate as cross-linking agent, 2.92 g of 1.3M LiPF 6 Mixed with a mixed solution of ethyl carbonate / propylene carbonate / diethyl carbonate at a mixing ratio of 41:49:10 and 0.0235 g of dibutyltin dilaurate. 3 g of the mixture was injected into a battery case with a roll of jelly roll, sealed, and then left to stand for two days. Then, the obtained product was thermally crosslinked at 65° C. for 4 hours to prepare a polymer electrolyte.

[0052] The standard charge / discharge data (0.5C charge, 0.2C discharge) of a lithium secondary battery (nominal capacity: 800mAh) fabricated using the obtained po...

Embodiment 2

[0054] A prepolymer for forming a polyether amino polymer was prepared in the same manner as in Example 1.

[0055] Subsequently, 0.1 g of the prepolymer was mixed with 0.091 g of glycerol ethoxylate as a crosslinker and 2.28 g of 1.3M LiPF 6 Mixed with a mixed solution of ethyl carbonate / propylene carbonate / diethyl carbonate in a mixing ratio of 41:49:10. The mixture was left at 25° C. for 12 hours to prepare a polymer electrolyte.

[0056] The polymer electrolyte is placed on the positive electrode (Li) and the negative electrode (LiCoO 2 ) to form a button cell. The charge / discharge characteristics of the button cell are measured by sweeping at 2.7-4.3V, and the results are shown in image 3 middle. Experimental Example 1

experiment Embodiment 1

[0057] This experiment is to measure the electrochemical stability of the polyether urethane polymer electrolyte prepared in Examples 1 and 2.

[0058] The dissolution potential of the polyether urethane polymer electrolyte prepared in embodiment 1 is measured with a lithium electrode and a stainless steel (sus) electrode, and the results are shown in figure 1 middle.

[0059] figure 1 Represents the linear purge voltammogram to measure the electrochemical stability of the polymer electrolyte prepared by the present invention, figure 1 It shows that the polyether urethane polymer electrolyte of the present invention is electrochemically stable even at 5.0V or higher.

[0060] Therefore, the polymer electrolyte of the present invention is suitable for lithium secondary batteries, and it must use a polymer electrolyte that is not dangerous when dissolved at 2.75-4.3V.

[0061] Because the lithium secondary battery of the present invention uses an electrochemically stable poly...

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Abstract

A polymeric electrolyte and a lithium battery lithium employing the same. The polymeric electrolyte includes a cross-linked polyether urethane prepared by reacting a pre-polymer having a polyethylene oxide backbone and terminated with NCO, with a cross-linking agent, organic solvent and lithium salt. Since the polymeric electrolyte is electrochemically stable, a lithium battery having improved reliability and safety can be obtained by employing the polymeric electrolyte.

Description

technical field [0001] The invention relates to a lithium battery, in particular to an electrochemically stable polymer electrolyte and a lithium battery using it. Background technique [0002] Lithium secondary batteries generate electric current by moving lithium ions between positive and negative electrodes. Compared with lithium cadmium batteries or nickel hydrogen batteries, lithium secondary batteries have higher energy density per unit volume and higher voltage. Also, compared with lithium cadmium batteries or nickel metal hydride batteries, lithium secondary batteries are lighter, in short, about half as heavy as those two. Therefore, lithium secondary batteries are very suitable for electric appliances that are miniaturized and used for a long time. [0003] As mentioned above, lithium secondary batteries have attracted much attention as the most promising high-efficiency batteries because they have higher voltage characteristics and longer charge / discharge life t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/48C08L75/08H01B1/06H01B1/12H01M4/62H01M6/10H01M6/16H01M6/18H01M10/05H01M10/0525H01M10/0565H01M10/0568H01M10/0569H01M10/058H01M50/417H01M50/457
CPCH01M2/162H01B1/122H01M2/1686H01M6/164H01M4/0402H01M10/052C08G18/4833H01M4/139H01M4/624H01M6/10H01M10/0525H01M4/621Y02E60/122H01M10/0565H01M6/188H01M2300/0082C08G18/10H01M10/058H01M6/166Y10T29/49115Y10T29/49108Y02E60/10H01M50/44Y02P70/50H01M50/417H01M50/457C08G18/3206
Inventor 李真英
Owner SAMSUNG SDI CO LTD
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