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

Lithium negative electrode with lithium content gradient distribution and preparation method thereof, lithium secondary battery

A lithium secondary battery, gradient distribution technology, applied in the field of lithium negative electrodes

Active Publication Date: 2022-06-03
郑州宇通集团有限公司 +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN109841811A discloses a lithium-based negative electrode material prepared from lithium and a blending agent at 180-400°C, but the lithium negative electrode obtained from this lithium-based negative electrode material cannot fully guarantee the energy density of the lithium negative electrode. Alleviating volume expansion and lithium dendrites in lithium anodes

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
  • Lithium negative electrode with lithium content gradient distribution and preparation method thereof, lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The lithium negative electrode with gradient distribution of lithium content in this embodiment, the schematic structural diagram of the lithium negative electrode with gradient distribution of lithium content is as follows figure 1 As shown in the figure, 1 is a lithium negative electrode with a gradient distribution of lithium content, 11 is metal lithium, 12 is a mixed conductive material, and 2 is a copper foil with a thickness of 8 μm.

[0041] The lithium negative electrode with a gradient distribution of lithium content in this embodiment includes a copper foil with a thickness of 8 μm and a negative electrode coating provided on the surfaces of both sides of the copper foil.

[0042] The negative electrode coating is composed of two layers of gradient coatings, and in order from the inside to the outside, the two layers of gradient coatings in the negative electrode coating are an inner gradient coating and an outer gradient coating in sequence.

[0043] Among t...

Embodiment 2

[0052] The lithium negative electrode with gradient distribution of lithium content in this embodiment includes a copper foil with a thickness of 8 μm and a negative electrode coating provided on the surfaces of both sides of the copper foil.

[0053] The negative electrode coating is composed of three layers of gradient coatings, and in order from the inside to the outside, the three layers of gradient coatings in the negative electrode coating are an inner gradient coating, a middle gradient coating and an outer gradient coating in sequence.

[0054] Wherein, the weight ratio of lithium aluminum alloy (3% aluminum content) to graphene in the inner gradient coating is 9.5:0.5, and the thickness of the inner gradient coating is 15 μm.

[0055] The weight ratio of lithium aluminum alloy to natural graphite in the intermediate gradient coating is 7:3, and the thickness of the intermediate gradient coating is 5 μm.

[0056] The weight ratio of lithium aluminum alloy to hard carbo...

Embodiment 3

[0065] The lithium negative electrode with gradient distribution of lithium content in this embodiment includes a copper foil with a thickness of 8 μm and a negative electrode coating provided on the surfaces of both sides of the copper foil.

[0066] The negative electrode coating is composed of two gradient coatings and a mixed conductive material layer, and in order from the inside to the outside, the negative electrode coating is an inner gradient coating, an outer gradient coating and a mixed conductive material layer.

[0067] Among them, the weight ratio of metallic lithium and acetylene black in the inner gradient coating is 9:1, and the thickness of the inner gradient coating is 20 μm.

[0068] The weight ratio of metallic lithium to acetylene black in the outer gradient coating is 2:8, and the thickness of the outer gradient coating is 3 μm.

[0069] In the mixed conductive material layer, the content of acetylene black in the mixed conductive material layer is 98%, ...

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a lithium negative electrode with a gradient distribution of lithium content, a preparation method thereof, and a lithium secondary battery, belonging to the technical field of lithium negative electrodes. The lithium negative electrode with lithium content gradient distribution of the present invention includes a current collector and a negative electrode coating arranged on the surface of the current collector. The negative electrode coating includes a lithium-containing material and a mixed conductive material, and the content of the lithium-containing material in the negative electrode coating is from the inside to the outside. It is distributed in a gradient decrease, and the mixed conductive material in the negative electrode coating is distributed in a gradient increase from the inside to the outside; the lithium-containing material is metallic lithium and / or metallic lithium alloy; the negative electrode coating is composed of at least two layers of gradient coatings; or, The negative electrode coating is composed of at least two layers of gradient coating and at least one layer of lithium-containing material layer and mixed conductive material layer. The gradient coating near the current collector has a high content of lithium-containing materials, which can increase the energy density of the lithium anode; the gradient coating near the electrolyte side has a high content of mixed conductive materials, which provide sites for metal lithium deposition and effectively inhibit lithium. Dendrite formation and growth.

Description

technical field [0001] The invention relates to a lithium negative electrode with gradient distribution of lithium content, a preparation method thereof, and a lithium secondary battery, belonging to the technical field of lithium negative electrodes. Background technique [0002] As an energy storage device, batteries have not only brought about the development of the portable electronics industry, but also driven the rapid rise of new energy vehicles, and have become an indispensable core component for the development of modern society. Lithium-ion batteries have become the first choice for batteries for portable electronic devices and new energy vehicles due to their high energy density, high power density, long life, and no memory effect. With the advancement of electronic equipment and the development and popularization of new energy vehicles, higher requirements have been placed on the energy density of lithium-ion batteries. Metal lithium has become the ultimate choi...

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): H01M4/38H01M4/40H01M4/62H01M4/134H01M4/1395H01M10/052H01M10/058
CPCH01M4/405H01M4/382H01M4/628H01M4/625H01M4/624H01M4/134H01M4/1395H01M10/052H01M10/058Y02P70/50Y02E60/10
Inventor 李云明周时国曹瑞中和冲冲裴卫兵彭能岭
Owner 郑州宇通集团有限公司