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Electrolyte/electrode interface integrated construction technology of all-solid-state lithium battery

An electrode interface and electrolyte technology, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of insufficient contact, affecting battery performance, large gaps, etc., to reduce interface impedance, optimize interface contact, The effect of improving conductivity

Active Publication Date: 2018-02-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the structure of an all-solid-state lithium battery, the solid-state electrolyte and the solid-state electrode are different from the solid-solid contact of the traditional lithium battery, resulting in insufficient contact and large gaps between layers, so that the electrode / electrolyte There is a huge interface impedance between them, which greatly affects the performance of the battery

Method used

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  • Electrolyte/electrode interface integrated construction technology of all-solid-state lithium battery
  • Electrolyte/electrode interface integrated construction technology of all-solid-state lithium battery
  • Electrolyte/electrode interface integrated construction technology of all-solid-state lithium battery

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Effect test

Embodiment 1

[0070] Under the protection of an inert atmosphere, A) The cathode material LiFePO 4 , Carbon black, polyethylene glycol diacrylate (weight average molecular weight 1000), pentaerythritol tetrakis (3-mercaptopropionic acid) ester according to a certain mass ratio 7:1:1:1 weighed into acetonitrile, and then added oxygen lithium ratio EO / Li=18:1 LiClO 4 , Stir uniformly at 50°C to obtain a precursor solution; B) After weighing pentaerythritol tetrakis (3-mercaptopropionic acid) ester and polyethylene glycol diacrylate (weight average molecular weight 1000) at a molar ratio of 1:1, Mix and stir in the dark, add LiTFSI according to the EO / Li molar ratio of 18:1, continue to stir in acetonitrile to obtain a slurry; evenly scrape the precursor solution on the current collector, and dry the slurry evenly Coated on the surface of the current collector coated with the precursor solution. After being fully infiltrated, irradiate it with ultraviolet light with a wavelength of 200-500nm for...

Embodiment 2

[0076] Under the protection of an inert atmosphere, A) Cathode material LiFePO 4 , Carbon black, pentaerythritol tetrakis (3-mercaptopropionic acid) ester and polyethylene glycol diacrylate (weight average molecular weight 2000) according to a certain mass ratio 7:1:1:1 weighed into tetrahydrofuran, and then added oxygen to lithium ratio EO / Li=18:1 LiClO 4 , Stir uniformly at 50°C to obtain a precursor solution; B) After weighing pentaerythritol tetrakis (3-mercaptopropionic acid) ester and polyethylene glycol diacrylate (weight average molecular weight 2000) at a molar ratio of 1:1, Avoid light, mix and stir, add LiClO according to the EO / Li molar ratio of 18:1 4 , Continue to stir uniformly in acetonitrile to obtain a slurry; evenly scrape the precursor solution on the current collector, after drying, coat the slurry evenly on the surface of the current collector coated with the precursor solution, and then use The ultraviolet light with a wavelength of 200-500nm is irradiated...

Embodiment 3

[0082] Under the protection of an inert atmosphere, A) Cathode material LiFePO 4 , Carbon black, pentaerythritol tetrakis (3-mercaptopropionic acid) ester and polyethylene glycol diacrylate (weight average molecular weight are respectively 200, 400, 600, 1000) according to a certain mass ratio 7:1:1:1 weighed and added In acetonitrile, add LiBOB with oxygen-lithium ratio EO / Li=14:1,16:1,18:1,20:1,22:1, and stir evenly at 50℃ to obtain a precursor solution; B) The pentaerythritol tetrakis (3-mercaptopropionic acid) ester and polyethylene glycol diacrylate (weight-average molecular weight are respectively 200, 400, 600, 1000) are respectively weighed at a molar ratio of 1:1, then mixed and stirred in the dark. Add LiBOB with different EO / Li molar ratios (14:1, 16:1, 18:1, 20:1, 22:1), continue to stir in acetonitrile to obtain slurry; evenly scrape the precursor solution on the set On the fluid, after drying, the slurry is evenly coated on the surface of the current collector coa...

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Abstract

The invention provides an electrolyte / electrode interface integrated construction technology of an all-solid-state lithium battery. According to the electrolyte / electrode interface integrated construction technology, a polymer electrolyte layer is prepared on a positive electrode material layer in situ; the interface contact between the positive electrode material layer and the electrolyte layer is improved and the interface impedance is reduced, so that the rate performance and the circulating performance of the battery are improved. A construction process of the all-solid-state lithium battery is extremely simplified, the cost is reduced and the interface contact is optimized; meanwhile, the electrical conductivity and the electrochemical stability of polymer electrolyte are improved.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to an integrated construction process of electrolyte / electrode interfaces in all solid-state lithium batteries. Background technique [0002] Lithium secondary batteries are widely used in daily life with many advantages such as large output power, high energy density, superior cycleability, no memory effect and no environmental pollution, and have become the first choice for rechargeable power supplies for portable electronic products. The most competitive vehicle power battery. However, the organic solvent electrolyte used in traditional batteries often causes safety hazards such as burning and explosion due to leakage and volatilization of liquid electrolyte. [0003] Solid-state batteries use solid electrolytes to replace traditional organic liquid electrolytes. Compared with traditional liquid lithium-ion batteries, solid-state batteries reduce the use of ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0565H01M10/0562
CPCH01M4/665H01M4/667H01M10/0562H01M10/0565Y02E60/10
Inventor 许晓雄陈少杰王俊烨
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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