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Positive electrode assembly of lithium ion battery, preparation method thereof and all-solid-state lithium battery

A lithium-ion battery, solid electrolyte technology, applied in battery electrodes, electrolyte battery manufacturing, electrical components, etc., can solve the problems of poor cycle performance, large solid battery impedance, affecting battery performance, etc., to achieve good cycle performance and high battery capacity. Effect

Inactive Publication Date: 2020-03-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the LATP-type lithium solid electrolyte and the garnet-type inorganic solid electrolyte have excellent performance, the solid batteries prepared by the above two solid electrolytes have large impedance and poor cycle performance, which affects the performance of the battery.

Method used

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  • Positive electrode assembly of lithium ion battery, preparation method thereof and all-solid-state lithium battery
  • Positive electrode assembly of lithium ion battery, preparation method thereof and all-solid-state lithium battery
  • Positive electrode assembly of lithium ion battery, preparation method thereof and all-solid-state lithium battery

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preparation example Construction

[0044] In the method for preparing a positive electrode assembly of a lithium-ion battery according to the second aspect of the present disclosure, a binder is often used in the preparation process of the prefabricated assembly, and the binder will decompose when heated to 300-500°C to generate CO 2 and H 2 O and other gas components volatilize from the composite layer, so the final positive electrode assembly contains no binder or contains a small amount of binder; when heated to 600-1000 ° C, the positive electrode active material and LiAlO 2 , LiAlO 2and the solid electrolyte are closely bonded together by high-temperature sintering, and, with the high-temperature melting process, between the positive electrode active material nanoparticles, LiAlO 2 The nanoscale particles melt and grow between the nanoparticles and in the solid electrolyte layer, and the melted and grown particles fuse with the particles close to the surface. Therefore, in the positive electrode assembly ...

Embodiment 1

[0061] (1) 10g nano-LiCoO 2 Add powder, 1g binder polyvinyl butyral PVB, 0.5g plasticizer dibutyl phthalate DBP to 15ml of v (ethanol): v (toluene) mixed solution of 1:4, to be dispersed After uniformity, it was cast onto the resin matrix material with a knife edge height of 150 μm, dried and peeled off to remove the resin matrix, and cut into positive electrode sheets with a diameter of 1.5 cm for use.

[0062] (2) 10g LiAlO 2 Powder (average particle size 575nm), 1g binder polyvinyl butyral PVB, 0.5g plasticizer dibutyl phthalate DBP, add 50ml v (ethanol): v (toluene) is 1:4 In the mixed solution, after being uniformly dispersed, the slurry is uniformly cast on the resin matrix material with a knife edge height of 25 μm, dried and peeled off to remove the resin matrix, and cut into isolation layers with a diameter of 1.5 cm for use.

[0063] (3) 10g nano Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) powder, 1g binder polyvinyl butyral PVB, 0.5g plasticizer dibutyl phthalate D...

Embodiment 2

[0067] (1) 5g nano-LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Mix the powder and 6.67g 1.5%wt polyvinyl alcohol (PVA) aqueous solution evenly, dry, get 0.13g material and press it into a disc with a diameter of 1.5cm under a pressure of 20MPa;

[0068] (2) 5g LiAlO 2 The powder (average particle size is 602nm) is dispersed in 6.67g of 1.5%wt polyvinyl alcohol (PVA) aqueous solution, and then 20g of deionized water is added, after uniform dispersion, 0.1g is taken and coated on the above-mentioned LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 sliced, dried, and set aside;

[0069] (3) 5g nanometer Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) powder is dispersed in 6.67g 1.5%wt polyvinyl alcohol (PVA) aqueous solution, then add 20g deionized water, mix well, take 0.1g material and coat on the above-mentioned LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 with LiAlO2 Composite LiAlO 2 surface, dried, and then pressed into a disc with a diameter of 1.5 cm under a pressure of 20 MPa.

[0070] (4) The above wafer was heat-tre...

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Abstract

The invention relates to a positive electrode assembly of a lithium ion battery, a preparation method thereof and an all-solid-state lithium battery. The positive electrode assembly comprises a positive plate, a solid-state electrolyte layer and an isolation layer clamped between the positive plate and the solid-state electrolyte layer, wherein the isolation layer contains LiAlO2. Based on the total weight of the positive electrode assembly, the content of the binder in the positive electrode assembly is 0-1%; in the positive electrode assembly, the interfacial shear strength between the positive plate and the isolation layer is 50-150 MPa, and the interfacial shear strength between the isolation layer and the solid electrolyte layer is 50-200 MPa. The preparation method disclosed by the invention comprises the following steps: a prefabricated body assembly is sintered, wherein the prefabricated body assembly comprises a positive electrode prefabricated layer, an isolation prefabricated layer and a solid electrolyte prefabricated layer, the positive electrode prefabricated layer contains a positive electrode active material, the isolation prefabricated layer contains LiAlO2, and the solid electrolyte prefabricated layer contains solid electrolyte. The lithium ion battery disclosed by the invention is high in capacity and good in cycle performance.

Description

technical field [0001] The present disclosure relates to the technical field of lithium batteries, in particular, to a positive electrode assembly of a lithium ion battery, a preparation method thereof, and an all-solid lithium battery. Background technique [0002] In recent years, the outstanding contribution of lithium-ion batteries to the development of safety, high capacity and long life is the optimization and modification of the electrolyte system. Because organic liquid electrolytes are prone to leakage, there are prominent safety hazards such as battery explosions, and the use of solid electrolytes can help improve the safety performance of lithium batteries, so all-solid-state lithium batteries have been developed rapidly. [0003] Common solid-state electrolytes in all-solid-state lithium batteries include polymer solid-state electrolytes, oxide solid-state electrolytes, and sulfide crystalline solid electrolytes, etc. Among them, oxide solid-state electrolytes ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/131H01M4/1391H01M10/058
CPCH01M4/131H01M4/1391H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 韩晓燕李世彩焦晓朋甘永青郭姿珠
Owner BYD CO LTD