Gel polymer battery and preparation method thereof

A gel polymer, polymer technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of battery safety hazards, no electrolyte and other problems, so as to help transmission and improve battery performance , the effect of inhibiting the growth of lithium dendrites

Inactive Publication Date: 2020-12-01
BYD CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problems that the battery system composed of lithium metal negative electrode and high-voltage positive electrode material has no suitable electrolyte and the hidden danger of battery safety in the use of liquid electrolyte in the prior art, the present invention provides a gel polymer A battery and a preparation method thereof, the gel polymer electrolyte is applicable to a battery system composed of a metal lithium negative electrode and a high-voltage positive electrode material, thereby greatly improving the energy density of the battery, and without using a liquid organic electrolyte, improving the battery life. safety performance

Method used

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  • Gel polymer battery and preparation method thereof

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preparation example Construction

[0039] In a second aspect, the present invention provides a method for preparing a gel polymer battery as described above, comprising the following steps:

[0040] (1) Preparation of ether electrolyte containing ether organic solvent, lithium salt, polymer monomer and initiator; preparation of carbonate electrolyte containing carbonate organic solvent, lithium salt, polymer monomer and initiator ;

[0041] (2) Prepare a semi-finished battery from the negative electrode, the positive electrode, and the ether electrolyte and carbonate electrolyte in step (1);

[0042] (3) Put the semi-finished battery obtained in step (2) in an oven to obtain a gel polymer battery.

[0043] In one embodiment, in step (1), the number of moles of lithium salt per unit volume is the same as the number of moles of organic solvent; the amount of polymer monomer added accounts for 1-20wt of the ether electrolyte or carbonate electrolyte %, the amount of the initiator added accounts for 0.5-10wt% of ...

Embodiment 1

[0054] (1) Preparation of ether electrolyte:

[0055] Add the lithium salt LiFSI to the ether organic solvent tetraethylene glycol dimethyl ether (TEGDME), so that the molar ratio of the lithium salt to the organic solvent is 1:1, and then add the polymer monomer ethoxylated trimethylol Ethyl propane triacrylate (ETPTA) and ethylene glycol diacrylate (PEGDA), so that its mass proportion is 5%, then add initiator azobisisobutyronitrile (AIBN), so that its mass proportion is 0.5wt %, magnetically stirred at room temperature for 0.5 h to obtain an ether electrolyte.

[0056] (2) Carbonate electrolyte preparation

[0057] Add lithium salt LiFSI to carbonate organic solvent diethyl carbonate (DEC), so that the molar ratio of lithium salt to organic solvent is 1:1, and then add polymer monomer ethoxylated trimethylolpropane Triacrylate (ETPTA) and ethylene glycol diacrylate (PEGDA), make its mass proportion be 5%, then add initiator azobisisobutyronitrile (AIBN), make its mass pro...

Embodiment 2

[0060] The difference from Example 1 is that in step (3), the ether electrolyte in (1) is first dropped on the surface of the lithium sheet, a diaphragm is placed on it, and the carbonate electrolyte is added dropwise on the diaphragm, and then The ternary positive electrode is placed on the carbonate electrolyte to form a button battery; in the obtained battery, the thickness of the ether gel polymer electrolyte layer is 10 μm, and the thickness of the carbonate gel polymer electrolyte layer is 10 μm.

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Abstract

The invention provides a gel polymer battery. The battery comprises a positive electrode, a negative electrode and a gel polymer electrolyte, the positive electrode is made of a material of which thevoltage is greater than 3.5 V, the negative electrode is metal lithium, the gel polymer electrolyte is of a layered structure and comprises an ether gel polymer electrolyte layer and a carbonic estergel polymer electrolyte layer, the ether gel polymer electrolyte layer is close to one side of the negative electrode, and the carbonic ester polymer electrolyte layer is close to one side of the positive electrode. The gel polymer electrolyte contains ether and carbonate gel electrolytes at the same time, so that the gel polymer electrolyte can be used in a battery system of which the negative electrode is made of metal lithium and the positive electrode is made of a high-voltage material, the energy density of the battery is greatly improved, and the safety performance of the battery is alsogreatly improved due to the use of the gel polymer electrolyte.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a gel polymer battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used due to their high energy density, good cycle performance, and small size. Therefore, with the development of lithium-ion batteries, people have put forward higher and higher requirements for battery safety performance and battery capacity. Liquid organic electrolytes are mostly used in existing lithium-ion batteries. Due to the volatile and flammable organic solvents, the batteries inevitably have safety problems such as liquid leakage, gas blowing, and combustion. Therefore, safer gel-state electrolytes are used instead. The liquid organic electrolyte can improve the safety performance of the battery, and the gel polymer electrolyte has higher ionic conductivity than the solid electrolyte, which can ensure good battery cycle performance. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0565H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0082H01M2300/0085Y02E60/10Y02P70/50
Inventor 李静郭姿珠马永军吴荣方陈嵩
Owner BYD CO LTD
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