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Electrochemical device and electronic equipment

An electrochemical and electrolyte technology, applied in electrochemical generators, electrolyte immobilization/gelation, circuits, etc., can solve problems such as poor physical contact, large grain boundary resistance, and poor interface stability

Active Publication Date: 2021-04-23
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the grain boundary resistance of the inorganic solid electrolyte itself is large, and the physical contact between the positive and negative electrodes is poor, which makes the interface stability between the electrolyte layer and the electrode layer of the solid battery prepared using the inorganic solid electrolyte poor, and lithium ion transmission Low capacity and poor cycle stability

Method used

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  • Electrochemical device and electronic equipment
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preparation example Construction

[0084] The above-mentioned positive electrode sheet and negative electrode sheet can be prepared by the commonly used positive electrode sheet and negative electrode sheet preparation methods in the art, which will not be repeated here.

[0085] The lithium ion battery of the present invention can be assembled into a button battery, a mold battery or a pouch battery.

[0086] Wherein, the pouch battery can be manufactured by common winding and stacking processes, and the method commonly used in the field for manufacturing pouch batteries can be used. Specifically, the positive electrode sheet, the electrolyte, and the negative electrode sheet are stacked in sequence, and the stacked cells are vacuum-packaged to obtain a lithium-ion battery with a stacked sheet structure. Alternatively, the laminated positive electrode sheet, electrolyte, and negative electrode sheet are wound, and the wound cell is vacuum-packaged to obtain a lithium-ion battery with a wound structure.

[008...

Embodiment 1

[0092] 1) Self-prepared oxide electrolyte powder Li according to the traditional solid-state sintering method 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 , and it is fully dried and set aside;

[0093] 2) Put the dried electrolyte powder into a mold and press it into a thin sheet, then sinter at 900°C for 6 hours, and then cool in the furnace to obtain an inorganic solid electrolyte layer, the thickness of which is 100 μm;

[0094] 3) methyl methacrylate (MMA), lithium hexafluorophosphate (LiPF 6 ), ethylene carbonate (EC), ethylene glycol dimethyl ether (DME), and benzoyl peroxide are mixed according to a mass ratio of 8:10:45:40:2, and stirred evenly at a speed of 600rpm to obtain nearly Electrolyte precursor on the positive electrode side;

[0095] 4) in Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3One surface of the inorganic solid electrolyte layer is coated with the electrolyte precursor near the positive side obtained in step 3), and the prepared lithium iron phosphate positive electrode s...

Embodiment 2

[0101] 1) For commercially purchased oxide electrolyte powder Li 3x La 2 / 3-x TiO 3 (x=0.11) carry out sufficient drying, standby;

[0102] 2) Put the dried electrolyte powder into a mold and press it into a thin sheet, then sinter at 950°C for 4 hours, and then cool in the furnace to obtain an inorganic solid electrolyte layer, the thickness of which is 315 μm;

[0103] 3) Pentaerythritol tetraacrylate, 4,5-dicyano-2-trifluoromethylimidazolium lithium (LiDTI), diethyl carbonate (DEC), azobisisobutyronitrile according to 6:15:88: Mix at a mass ratio of 1, and stir evenly at a speed of 400rpm to obtain the electrolyte precursor near the positive side;

[0104] 4) in Li 3x La 2 / 3-x TiO 3 (x=0.11) one surface coating step 3) of the inorganic solid electrolyte layer obtains near positive electrode side electrolyte precursor solution, the prepared LiNi 0.5 co 0.3 mn 0.2 o 2 The positive electrode sheet is covered on the electrolyte precursor near the positive electrode, an...

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Abstract

The invention provides an electrochemical device and electronic equipment. The electrochemical device comprises an electrolyte layer, a positive electrode layer and a negative electrode layer, the electrolyte layer comprises a near-positive-electrode-side electrolyte layer, an intermediate electrolyte layer and a near-negative-electrode-side electrolyte layer which are sequentially stacked, the electrolyte layer is arranged between the positive electrode layer and the negative electrode layer, the near-positive-electrode-side electrolyte layer is close to the positive electrode layer, and the near-negative-electrode-side electrolyte layer is close to the negative electrode layer; the near-positive-electrode-side electrolyte layer and the near-negative-electrode-side electrolyte layer are polymer electrolyte layers; the positive electrode layer comprises a positive electrode electrolyte skeleton and a positive electrode active layer filling the positive electrode electrolyte skeleton, and the composition of the positive electrode electrolyte skeleton is the same as that of the near positive electrode side electrolyte layer; and the intermediate electrolyte layer is an inorganic solid electrolyte layer. The electrochemical device is high in mechanical property, the physical contact between the electrolyte layer and the electrode layer is good, the interface stability is good, and the lithium ion transmission capacity and the cycling stability are high.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrochemical device and electronic equipment. Background technique [0002] In recent years, among various commercial rechargeable and dischargeable chemical energy storage devices, lithium-ion batteries have attracted much attention since they were put into the market due to their high energy density and long service life. fields are widely used. However, lithium-ion batteries using organic electrolytes have potential safety hazards of flammability and explosion. [0003] Although the solid electrolyte in the solid electrolyte lithium-ion battery has high mechanical strength and a certain ability to resist the growth of lithium dendrites, it can improve the flammable and explosive safety hazards of lithium-ion batteries using organic electrolytes. However, the grain boundary resistance of the inorganic solid electrolyte itself is large, and the physical contact between...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02E60/10
Inventor 张赵帅赵伟李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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