Preparation method of integrally formed solid-state battery

A solid-state battery and electrode technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of poor interface compatibility, difficult to guarantee physical interface contact, and poor product consistency.

Pending Publication Date: 2020-05-08
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, solid-state batteries also face some urgent problems, which limit their large-scale application.
The most important thing is that the capacity of large-capacity solid-state batteries is severely attenuated during the cycle, and the long-term cycle stability is poor; for the application of fast-charge solid-state batteries, the power density needs to be improved; dendrite growth causes safety problems such as short circuits and thermal runaway, which are related to Solid-state electrolytes, electrode ion transport kinetics, solid / solid interface physical and chemical contact issues are closely related
[0004] Most of the existing solid-state batteries are based on the traditional lithium-ion battery preparation technology. The pre-prepared key material layers are wound or stacked, and the interface physical contact is difficult to be guaranteed, which exacerbates the problems of large interface impedance and poor interface compatibility, which seriously affects The performance of the battery is not good, and the preparation process is complicated, and the product consistency is poor

Method used

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  • Preparation method of integrally formed solid-state battery

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preparation example Construction

[0040] The invention discloses a method for preparing an integrated solid-state battery. The method includes the following steps:

[0041] 1) Preparation of composite positive electrode layer: a mixture of 80-88 parts by mass of modified or unmodified positive electrode active material, 2-10 parts by mass of conductive agent, 2 parts by mass of binder, 6 parts by mass of polymer and lithium salt , 2 parts by mass of inorganic electrolyte, respectively dissolved in 400 parts by mass of organic solvent to obtain positive electrode slurry; apply positive electrode slurry on aluminum foil, dry at 70°C for 1 hour, and dry at 70°C for 24 hours in vacuum , the loading capacity of single-sided positive electrode is 15-16mg / cm 2 ;

[0042] Wherein, the mass ratio of the polymer to the lithium salt is preferably 1:10-4:1.

[0043] 2) Preparation of solid electrolyte slurry: Dissolve 1-2 parts by mass of lithium salt and 4-5 parts by mass of polymer in 50 parts by mass of organic solve...

Embodiment 1

[0062] A method for preparing an integrated solid-state battery, the specific preparation process comprising:

[0063] 1) Preparation of composite cathode layer

[0064] Mix 80g of positive electrode material NCA with 10g of conductive agent Super P, add a mixture of 8g of polypropylene carbonate (PPC) and lithium salt (LiTFSI), 2g of inorganic electrolyte LLZTO and 400ml of N-methyl-2-pyrrolidone, and stir for 3 hours to obtain a positive electrode Slurry: Coat the positive electrode slurry on aluminum foil, dry at 70°C for 1 hour, and dry at 70°C for 24 hours in vacuum, the positive electrode loading on one side is 15mg / cm 2 ; Wherein, polymer and lithium salt mass ratio are 1:10.

[0065] 2) Preparation of solid electrolyte slurry

[0066] Mix 4g of polypropylene carbonate PPC with 1g of lithium salt LiTFSI, add 50g of dimethylacetamide DMAc, stir at 70°C for 12 hours to make it evenly mixed, add 0.8g of inorganic electrolyte LLZTO, stir for 6 hours until uniformly disper...

Embodiment 2

[0075] The invention relates to a preparation method of an integrated solid-state battery, in which an integrated structure of an electrode and an electrolyte is sequentially stacked and assembled to form a solid-state battery. Specific preparation process:

[0076] 1) Preparation of composite cathode layer

[0077] 88g ternary cathode material LiNi 0.8 mn 0.1 co 0.1 o 2 Mix with 2g conductive agent acetylene black, add a mixture of 6g polymer cyano rubber and lithium salt LiFSI, 2g inorganic electrolyte Li1 +x al x Ge 2-x (PO 4 ) 3 , 2g binder PVDF and 400ml N-methyl-2-pyrrolidone, stir for 3 hours to obtain positive electrode slurry, apply positive electrode slurry on aluminum foil, dry at 70°C for 1 hour, and dry at 70°C for 24 hours in vacuum , the loading capacity of single-sided positive electrode is 16mg / cm 2 ;

[0078] 2) Preparation of solid electrolyte slurry

[0079] Mix 5g polymer cyano rubber with 2g lithium salt LiFSI, add 50g dimethylformamide, stir ...

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Abstract

The invention belongs to the technical field of lithium ion battery electrolyte, and particularly relates to a preparation method of an integrally formed solid-state battery. The method comprises thefollowing steps: respectively dissolving a modified or unmodified electrode active substance, a conductive agent, a binder, a polymer, a lithium salt and an inorganic electrolyte in an organic solventto obtain electrode slurry; coating a current collector with the electrode slurry, drying, and rolling to obtain an electrode plate; mixing a lithium salt, a polymer, an inorganic filler, a polymericmonomer and an initiator in proportion, and dissolving the mixture in an organic solvent to form electrolyte precursor slurry; coating the electrolyte precursor slurry on the surface of the electrodeplate, and carrying out thermal initiation or photo initiation or heating drying to prepare an electrode and electrolyte integrated structure; and obtaining the solid-state battery cell in a hot pressing manner. According to the invention, the problems of poor physical contact between key material layers and large interface impedance caused by separated multi-layer stacking preparation are effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolyte, and in particular relates to a preparation method of an integrally formed solid-state battery. Background technique [0002] Solid-state batteries use solid-state electrolytes to replace the electrolyte and diaphragm in traditional lithium-ion batteries, which eliminates safety issues such as leakage, flammability and explosion caused by organic liquids, and has better compatibility with high-specific energy electrodes, which is expected to fundamentally solve The existing secondary battery system has bottlenecks in safety and energy density. At the same time, solid-state batteries have more stable performance under extreme conditions (over-temperature, vibration, pressure, etc.), broadening their application range and becoming a potential replacement for lithium-ion batteries product. [0003] However, solid-state batteries also face some urgent problems, which limit the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/131H01M4/1391H01M10/0525H01M10/0565
CPCH01M4/131H01M4/1391H01M10/0565H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李杨赵冬梅桑林丁飞刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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