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

Flexible silicon monoxide-based lithium battery negative electrode material, negative electrode piece and lithium battery

A silicon oxide-based lithium and battery negative electrode technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of lithium-ion battery capacity attenuation, volume expansion effect is not particularly obvious, etc.

Inactive Publication Date: 2021-09-07
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the capacity of the lithium-ion battery decays quickly, and the raw materials contain carcinogens such as asphalt, which has certain disadvantages
In addition, in the patent application 201611178931.6 and the patent application 201810279235.7, nano-silicon is used as the matrix material for surface modification to obtain an egg-like structure, but due to the limitation of the nano-silicon material structure, the specific capacity of the nano-silicon-based lithium battery negative electrode material is average. At about 1200-1300mAh / g, the improvement effect of the material obtained by coating on the volume expansion effect is not particularly obvious

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
  • Flexible silicon monoxide-based lithium battery negative electrode material, negative electrode piece and lithium battery
  • Flexible silicon monoxide-based lithium battery negative electrode material, negative electrode piece and lithium battery
  • Flexible silicon monoxide-based lithium battery negative electrode material, negative electrode piece and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a flexible silicon oxide-based negative electrode material for a lithium battery, including a silicon-oxygen powder material, a carbon layer coated on the outer surface of the silicon-oxygen powder material, and a flexible layer coated outside the carbon layer. The silica powder material is modified silicon oxide, accounting for 90% by mass; the carbon layer is made of hard carbon, accounting for 6% by mass; the flexible layer is made of polyvinyl alcohol, accounting for 4% by mass.

[0048] Weigh the flexible silicon oxide-based lithium battery negative electrode material, conductive additive carbon black, and binder sodium cellulose and styrene-butadiene rubber at a ratio of 95:2:3. At room temperature, load into a beater for slurry preparation. Spread the prepared slurry evenly on the copper foil. After drying for 2 hours in a blast drying oven at 50°C, cut them into 8×8mm pole pieces, and vacuum-dry them in a vacuum drying oven at 100°C for...

Embodiment 2

[0051] This embodiment provides a flexible silicon oxide-based negative electrode material for a lithium battery, including a silicon-oxygen powder material, a carbon layer coated on the outer surface of the silicon-oxygen powder material, and a flexible layer coated outside the carbon layer. The silicon oxide powder material is silicon oxide, accounting for 95% by mass; the carbon layer is made of soft carbon, accounting for 3% by mass; the flexible layer is composed of polyvinyl butyral, accounting for 2% by mass.

[0052] The preparation of the pole piece, battery assembly and battery test are the same as in Example 1. The test results show that the reversible capacity of C / 10 is 1660mAh / g, and the initial efficiency is 76%.

Embodiment 3

[0054] This embodiment provides a flexible silicon oxide-based negative electrode material for a lithium battery, including a silicon-oxygen powder material, a carbon layer coated on the outer surface of the silicon-oxygen powder material, and a flexible layer coated outside the carbon layer. The silicon oxide powder material is silicon oxide, accounting for 92% by mass; the carbon layer is made of soft carbon, accounting for 3% by mass; the flexible layer is composed of polyvinyl butyral, accounting for 5% by mass.

[0055] The preparation of the pole piece, battery assembly and battery test are the same as in Example 1. The test results show that the reversible capacity of C / 10 is 1684mAh / g, and the initial efficiency is 73.2%.

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
Particle sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The embodiment of the invention relates to a flexible silicon monoxide-based lithium battery negative electrode material, a negative electrode piece and a lithium battery. The negative electrode material comprises 40-99.9 wt% of a silica powder material, 0-50 wt% of a carbon layer and 0.01-10 wt% of a flexible layer, wherein the outer surface of the silica powder material is coated with the carbon layer, and the carbon layer is coated with the flexible layer; the silica powder material is specifically a silica powder material containing electrochemical activity, the particle size of the material is 0.5-100 [mu] m, and the material comprises one or more of silicon monoxide, modified silicon monoxide or doped silicon monoxide; the thickness of the carbon layer is 0-500nm, and the carbon layer comprises one or more of soft carbon, hard carbon, mesocarbon microbeads, graphitized mesocarbon microbeads, natural graphite, modified natural graphite, artificial graphite, carbon black, a carbon tube and a single-wall carbon tube; the thickness of the flexible layer is 5-500 nm, and the flexible layer comprises a flexible material composed of one or more of a semi-carbonized or non-carbonized polyalcohol material, a polyester material, a siloxane material, a thiophene material or an amide material; and the average particle size of the flexible silicon monoxide-based lithium battery negative electrode material is 30 nm to 50 [mu] m.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a flexible silicon oxide-based lithium battery negative electrode material, a negative pole piece and a lithium battery. Background technique [0002] In recent years, with the rise of portable electronic communication equipment and new energy vehicles, the research and development of high-performance and high-capacity lithium-ion batteries is imminent. Compared with traditional graphite anode materials, silicon-based anode materials have extremely high theoretical specific capacity (4200mAh / g), occupying a great market advantage. Therefore, in the field of new energy vehicles and portable miniaturized electronic equipment, silicon-based negative electrode materials are very popular. [0003] Although there is an ideal specific capacity, a series of shortcomings such as the volume expansion effect and poor conductivity of silicon-based anode materials limit their pra...

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
IPC IPC(8): H01M4/62H01M4/48H01M4/131H01M10/0525
CPCH01M4/483H01M4/131H01M4/628H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 潘明军刘柏男罗飞
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD