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A kind of preparation method of solid electrolyte lithium ion battery and battery

A solid-state electrolyte and lithium-ion battery technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve problems that affect battery performance and safety, pole piece sticking to rollers, and insufficient contact, and improve the interface Compatibility, improvement of interface problems, effects of reducing leakage current

Active Publication Date: 2020-12-08
东莞赣锋电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, the research on solid-state electrolytes has become the core of the research field of all-solid-state lithium-ion batteries. However, in the structure of all-solid-state lithium batteries, the solid-state electrolyte and solid-state electrodes are different from traditional lithium batteries in solid-solid contact, resulting in insufficient contact. There is a large gap between the layers, so there is a huge interface impedance between the electrode / electrolyte, which greatly affects the performance of the battery
In addition, the conductivity of solid-state electrolytes is generally low, which is lower than that of liquid electrolytes; this leads to the overall low rate performance of current all-solid-state batteries, large internal resistance, and large voltage drop during high-rate discharge.
At the same time, in the prior art, in the preparation process of the battery, there are problems such as sticking rolls and falling off of the pole piece, which greatly affects the performance of the battery and the safety of use.

Method used

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  • A kind of preparation method of solid electrolyte lithium ion battery and battery
  • A kind of preparation method of solid electrolyte lithium ion battery and battery

Examples

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Embodiment 1

[0031] A method for preparing a solid electrolyte lithium-ion battery, comprising the following steps:

[0032] (1) Weigh 0.98kg of lithium cobaltate, 0.1kg of N-methylpyrrolidone, 0.0035kg of carbon nanotube conductive agent, 0.0075kg of polyvinylidene fluoride and 0.00147kg of lithium sulfide solid electrolyte, and add them to the stirring tank Mix and stir for 7 hours at a speed of 1000rpm, and evenly coat the positive electrode slurry on the upper and lower surfaces of an aluminum foil with a thickness of 10 μm; then place the aluminum foil in a vacuum drying oven to bake at a temperature of 170°C and a degree of vacuum to 0.1MPa, baking time 2h, made the positive electrode sheet.

[0033](2) Take by weighing the graphite of 0.96kg, the styrene-butadiene rubber binding agent of 0.012kg, the conductive carbon black of 0.012kg and the lithium sulfide solid electrolyte of 0.0096kg, add in the mixing tank and mix, and stirring for 5h under the rotating speed is 1200rpm, will ...

Embodiment 2

[0038] A method for preparing a solid electrolyte lithium-ion battery, comprising the following steps:

[0039] (1) Weigh 0.982kg of lithium cobaltate, 0.12kg of N-methylpyrrolidone, 0.0045kg of carbon nanotube conductive agent, 0.008kg of polyvinylidene fluoride and 0.003kg of lithium sulfide solid electrolyte, and add them to the stirring tank Mix and stir for 7.5 hours at a rotation speed of 1200rpm, and evenly coat the positive electrode slurry on the upper and lower surfaces of an aluminum foil with a thickness of 10 μm; then place the aluminum foil in a vacuum oven and bake at a temperature of 200°C and a vacuum degree of 0.3 MPa baking time is 6h, and the positive electrode sheet is prepared.

[0040] (2) Take by weighing the graphite of 0.965kg, the styrene-butadiene rubber binding agent of 0.014kg, the conductive carbon black of 0.014kg and the lithium sulfide solid state electrolyte of 0.00965, add in the mixing tank and mix, and stirring for 5.5h under the rotating ...

Embodiment 3

[0045] A method for preparing a solid electrolyte lithium-ion battery, comprising the following steps:

[0046] (1) Weigh 0.984kg of lithium cobaltate, 0.13kg of N-methylpyrrolidone, 0.005kg of carbon nanotube conductive agent, 0.009kg of polyvinylidene fluoride and 0.005kg of lithium sulfide solid electrolyte, and add them to the stirring tank Mix and stir for 7.5 hours at a rotation speed of 1400rpm, and evenly coat the positive electrode slurry on the upper and lower surfaces of an aluminum foil with a thickness of 10 μm; then place the aluminum foil in a vacuum drying oven and bake at a temperature of 220°C and a vacuum degree of 0.5 MPa baked for 10 hours to prepare the positive electrode sheet.

[0047] (2) Take by weighing the graphite of 0.97kg, the styrene-butadiene rubber binding agent of 0.015kg, the conductive carbon black of 0.015kg and the lithium sulfide solid electrolyte of 0.0097kg, add in the mixing tank and mix, and stirring for 5.5h under the rotating speed...

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Abstract

The invention discloses a preparation method of a solid-state electrolyte lithium-ion battery and the battery, and relates to the technical field of lithium batteries. The electrolyte is mixed, coated on the surface of the aluminum foil, and baked; (2) the graphite, binder, conductive agent and solid electrolyte are mixed, coated on the surface of the copper foil, and dried; (3) the gel state solid electrolyte is coated On the surface of non-woven base film; (4) Winding and baking; (5) Liquid injection, hot pressing, cold pressing. The invention has the beneficial effects of improving the interface problem of the solid-state battery; at the same time, improving the problem of low rate performance of the solid-state battery, improving power and rate performance, and improving the ion conductivity and cycle performance of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a solid electrolyte lithium ion battery and the battery. Background technique [0002] A battery is a device that converts chemical energy into electrical energy and consists of a positive electrode, a negative electrode, a separator, and an electrolyte. Using batteries as a source of energy can obtain stable voltage and current, and can provide stable power supply for a long time. Compared with other batteries, secondary batteries have a longer service life and are more economical and practical. Among them, lithium-ion batteries have been widely used in the field of electronic products because of their high energy density, long life and high output voltage. [0003] Batteries can be divided into liquid electrolyte batteries and solid electrolyte batteries according to different electrolytes. Compared with liquid electrolytes, solid-state lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0565
CPCY02E60/10Y02P70/50
Inventor 王乾白羽戈志敏戴小勇
Owner 东莞赣锋电子有限公司
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