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Layered all-solid-state lithium ion battery and preparation method thereof

A lithium-ion battery, all-solid-state technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the complex preparation process of all-solid-state thin-film batteries, which hinders product marketization and commercial application, and solid-state battery capacity Small and other problems, to achieve the effect of good compactness, short holding time, and solve the problem of volatilization

Active Publication Date: 2018-12-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the thinning of electrode materials and solid electrolytes, the capacity of solid-state batteries is very small, which can only be applied to some scenarios with small capacity requirements, and the preparation process of all-solid-state thin-film batteries is complicated and expensive, which seriously hinders the marketization of its products and commercial applications

Method used

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  • Layered all-solid-state lithium ion battery and preparation method thereof
  • Layered all-solid-state lithium ion battery and preparation method thereof
  • Layered all-solid-state lithium ion battery and preparation method thereof

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preparation example Construction

[0036] In order to solve the first technical problem of the present invention, the preparation method of the layered all-solid lithium ion battery comprises:

[0037] a. Prepare positive or negative electrode ceramic sheets, polish the surface of the ceramic sheets, and set aside;

[0038] b. prepare lithium lanthanum titanate sol solution by sol-gel method;

[0039] c. Spin coating the lithium lanthanum titanyl oxide sol solution on the polished ceramic sheet in step a, then bake the ceramic sheet to volatilize the organic matter, and finally anneal at a high temperature to obtain a lithium lanthanum titanic oxide film on the surface of the ceramic sheet; The high-temperature annealing process is as follows: first, the temperature is raised to 350-450°C, and the heat treatment is performed for 5-15 minutes; then, the temperature is rapidly raised to 600-900°C, and the annealing treatment is performed for 5-15 minutes.

[0040] Preferably, the method further includes: d. repe...

Embodiment 1

[0058] Step 1: Preparation of LiCoO 2 Positive ceramic sheet

[0059] ① Granulation: Weigh an appropriate amount of lithium cobalt oxide (LiCoO 2 ) powder is granulated, wherein the adhesive is 10% PVA by mass fraction;

[0060] ② Tablet: Weigh 0.6g of LiCoO after granulation 2 The powder is compressed into tablets, wherein the pressure is 10MPa, and the holding time is 3min;

[0061] ③ Debinding: Heating from room temperature to 400°C after 7 hours, then heating from 400°C to 650°C after 10 hours, keeping it warm for 2 hours, and then cooling with the furnace;

[0062] ④ Sintering: LiCoO obtained after debinding 2 Sintering at 1000°C and holding for 3h to obtain LiCoO 2 Anode ceramic sheet;

[0063] ⑤ Polishing: first use 600#, 800#, 1000#, 1200#, 1400#, 1600#, 1800#, 2000# metallographic sandpaper to LiCoO 2 The ceramic piece is polished, and then W 0.5 , W 0.25 diamond polishing fluid for polishing until LiCoO 2 The surface of the ceramic sheet reaches a mirror le...

Embodiment 2

[0076] Step 1: Preparation of lithium titanate (Li 4 Ti 5 o 12 ) Negative ceramic sheet

[0077] ① Granulation: Weigh an appropriate amount of lithium titanate (Li 4 Ti 5 o 12 ) powder is granulated, wherein the adhesive is 10% PVA by mass fraction;

[0078] ② Tablet pressing: Weigh 0.6g of Li after granulation 4 Ti 5 o 12 The powder is compressed into tablets, wherein the pressure is 10MPa, and the holding time is 3min;

[0079] ③ Debinding: Heating from room temperature to 400°C after 7 hours, then heating from 400°C to 650°C after 10 hours, keeping it warm for 2 hours, and then cooling with the furnace;

[0080] ④ Sintering: the Li obtained after debinding 4 Ti 5 o 12 Sintered at 800°C and kept for 5h to obtain Li 4 Ti 5 o 12 Negative electrode ceramic sheet;

[0081] ⑤Polishing: first use 600#, 800#, 1000#, 1200#, 1400#, 1600#, 1800#, 2000# metallographic sandpaper on Li 4 Ti 5 o 12 Negative electrode ceramic sheet is polished, and then W 0.5 , W 0.25 ...

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Abstract

The invention relates to a layered all-solid-state lithium ion battery and a preparation method thereof, belonging to the technical field of all-solid-state lithium ion batteries. The preparation method of the layered all-solid-state lithium ion battery comprises the following steps: a. preparing a positive electrode or a negative electrode ceramic sheet, polishing the surface of the ceramic sheetfor standby; B. preparing a lithium lanthanum titanium oxide sol solution by a sol-gel method; (c) applying the lithium lanthanum titanium oxide sol liquid on the polished ceramic sheet in step (a) through spin coating, baking the ceramic sheet to volatilize organic matter, and finally annealing at high temperature to obtain a lithium lanthanum titanium oxide thin film on the surface of the ceramic sheet. The high temperature annealing process is to increase temperature to 350-450 DEG C and perform heat treatment for 5-15min, and then rapidly increase temperature to 600-900 DEG C and performannealing for 5-15 min. The preparation method of the invention does not require polymer auxiliary deposition and expensive vacuum equipment, and has the advantages of simple process, low cost and lowinterface impedance. A lithium lanthanum titanium oxide thin film is obtain, that particles of the lithium lanthanum titanium oxide thin film are nano-scale, the density is good, and the problem of the volatilization of Li in the preparation process of the lithium lanthanum titanium oxide thin film is sol due to the short holding time of the lithium lanthanum titanium oxide thin film.

Description

technical field [0001] The invention relates to a layered all-solid lithium-ion battery and a preparation method thereof, belonging to the technical field of all-solid-state lithium-ion batteries. Background technique [0002] Due to its high voltage platform, light weight, high energy density, long service life, and environmental protection, lithium-ion batteries have been widely used in mobile phones, laptop computers, cameras and other electronic products. At the same time, lithium-ion batteries are used as energy storage devices in In electric vehicles, it is also used in the aerospace field. However, the traditional lithium battery uses organic liquid electrolyte, which has serious safety problems. The liquid electrolyte has leakage phenomenon, and the battery will heat up and expand or even explode when it is overcharged or short-circuited. Replacing liquid electrolytes with solid electrolytes can fundamentally solve the safety problems caused by liquid electrolytes, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0562H01M10/0525B82Y30/00
CPCB82Y30/00H01M10/0525H01M10/0562H01M10/058H01M2300/0071Y02E60/10Y02P70/50
Inventor 何泓材陈昱锜郭甜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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