Unlock instant, AI-driven research and patent intelligence for your innovation.

A composite positive electrode sheet, preparation method and solid-liquid mixed lithium battery

A composite positive electrode and positive electrode technology, which is applied in the manufacture of lithium batteries, electrolyte batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low porosity of positive electrode materials and electrolyte materials, affecting the performance of lithium batteries, and high concentration polarization. Achieve the effect of easy industrial application, excellent battery performance, and reduced concentration polarization

Active Publication Date: 2022-08-05
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
View PDF15 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porosity of the positive electrode material and electrolyte material on the positive electrode sheet prepared by atomization spraying method is relatively low.
Although the lithium battery made of the positive electrode sheet has good performance in the low-rate charge-discharge environment, it will produce high concentration polarization in the electrode in the high-rate charge-discharge environment, which will affect the performance of the lithium battery. battery performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A composite positive electrode sheet, preparation method and solid-liquid mixed lithium battery
  • A composite positive electrode sheet, preparation method and solid-liquid mixed lithium battery
  • A composite positive electrode sheet, preparation method and solid-liquid mixed lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1a

[0079] see figure 1 , is a composite positive electrode sheet disclosed in the present invention, comprising a current collector foil 11 and several positive electrode layers 12 covered on the surface of the current collector foil 11 by electrospinning; the positive electrode layer 12 is mainly composed of graphene, LiCoO 2 Monolayer structure made by mixing with LLZO.

[0080] The preparation method of the above-mentioned composite positive electrode sheet comprises the following steps:

[0081] ①, preparation of glue

[0082] Solution A: Weigh PEO and ultrasonically disperse it in DMF to prepare a dispersion solution, denoted as solution A.

[0083] Positive glue: take an appropriate amount of solution A, add LiCoO to solution A 2 , after ultrasonic dispersion for 30 min, it was recorded as solution B, and the solution B was placed in a mechanical stirrer and stirred for 5 h until the mixture was uniform to form a positive electrode glue with a solid content of 30%, and L...

Embodiment 1b-1f

[0099] Examples 1b-1f are based on the preparation method and spraying equipment of Example 1a, and adjust the carbon material, the positive electrode active material and the solid electrolyte material. The specific adjustment is shown in Table 1 below.

[0100] Table 1 Material adjustment of the positive electrode layer in Examples 1a-1f

[0101]

Embodiment 1g-1j

[0103] In Examples 1g-1j, on the basis of the preparation method and spraying equipment of Example 1a, the preparation parameters of the composite positive electrode sheet were adjusted, and the specific adjustment situation is shown in Table 2 below.

[0104] Table 2 Preparation parameters of the composite positive electrode sheets of Examples 1g-1j

[0105]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
thicknessaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of lithium battery production, in particular to a composite positive electrode sheet, a preparation method and a solid-liquid mixed lithium battery. The positive electrode layer; the positive electrode layer is a single-layer structure mainly made of a mixture of carbon materials, positive electrode active materials and solid electrolyte materials, or a carbon-coated layer mainly made of carbon materials, a positive electrode active material layer made of positive electrode active materials, and A composite layer structure formed by sequentially compounding solid electrolyte layers made of solid electrolyte materials; and a carbon-coated layer in the positive electrode layer of the composite layer structure is covered on the surface of the current collector foil, with a pore size of 10-200 nm and a thickness of 0-5 μm . The present invention performs electrospinning based on special spraying equipment, thereby spraying carbon material, positive electrode active material and solid electrolyte material on the surface of the current collector, and finally obtains a composite positive electrode sheet with high porosity, so that the lithium battery has excellent battery performance.

Description

technical field [0001] The invention relates to the technical field of lithium storage battery production, in particular to a composite positive electrode sheet, a preparation method and a solid-liquid mixed lithium storage battery. Background technique [0002] At present, the lithium battery has developed to a very mature stage. With the continuous expansion of the application scope of the lithium battery, people have put forward higher and higher requirements for the energy density of the lithium battery. The positive electrode sheet of the existing lithium battery is usually composed of a current collector foil, a positive electrode material and an electrolyte material. During the production process, the positive electrode material and the electrolyte material are sequentially coated on the current collector foil by atomization and spraying. surface. [0003] With the development of technology, the spraying method of cathode material and electrolyte material on the surf...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/058H01M10/052H01M4/04H01M4/13H01M4/139
CPCH01M10/0562H01M10/058H01M10/052H01M4/0404H01M4/0419H01M4/13H01M4/139Y02P70/50
Inventor 许晓雄丁超魏引利密豹豹
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD