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

A kind of graphite composite negative electrode material and preparation method thereof, lithium ion battery

A technology of negative electrode material and composite material, applied in the field of lithium ion battery materials, can solve the problem of limited improvement in the fast charging performance of graphite materials, etc.

Active Publication Date: 2021-08-31
CALB CO LTD
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above modification methods have any effect on the lattice structure of graphite, so that the improvement of fast charging performance of graphite materials is limited.

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 kind of graphite composite negative electrode material and preparation method thereof, lithium ion battery
  • A kind of graphite composite negative electrode material and preparation method thereof, lithium ion battery
  • A kind of graphite composite negative electrode material and preparation method thereof, lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation method of the graphite composite negative electrode material of the present embodiment comprises the following steps:

[0033] (1) 1.5g tetrabutyl titanate is dissolved in 80mL ethylene glycol solution (ethylene glycol mass concentration is 10%) to form titanium-containing turbid liquid; 3g tin dioxide is added to 80mL hydrochloric acid (concentration 36%) and In the mixed acid of 200mL EDTA solution (the concentration of EDTA is 0.2g / L), the tin-containing solution is obtained; after that, the titanium-containing turbid solution is added to the tin-containing solution, and after stirring evenly, pass into Adjust the pH value of the solution to 9 with ammonia gas to obtain a solution containing titanium and tin; then transfer the solution containing titanium and tin to an autoclave, add 8g of aniline and 100g of artificial graphite, and react at a temperature of 180°C for 12h , filtered, and vacuum-dried to obtain a doped titanium / tin-graphite composite ...

Embodiment 2

[0036] The graphite composite negative electrode material of this example is prepared by the preparation method of Example 1. Depend on figure 1 It can be seen that the graphite composite negative electrode material of this embodiment presents a spherical structure, and the particle size is between 5 μm and 20 μm.

Embodiment 3

[0038] The preparation method of the graphite composite negative electrode material of the present embodiment comprises the following steps:

[0039] (1) Dissolve 1g tetrabutyl titanate in 50mL ethylene glycol solution (ethylene glycol mass concentration is 1%) to form a titanium-containing turbid solution; add 2g tin dioxide to 50mL hydrochloric acid (concentration 36%) and 150mL In the mixed acid of EDTA solution (the concentration of EDTA is 0.5g / L), a tin-containing solution is obtained; then the titanium-containing turbid solution is added to the tin-containing solution, and after stirring evenly, the ammonia Adjust the pH value of the solution to 10 to obtain a solution containing titanium and tin; then transfer the solution containing titanium and tin to an autoclave, add 5g of pyrrole and 100g of artificial graphite, and react at a temperature of 120°C for 12h, filter , vacuum drying to obtain doped titanium / tin graphite composite material;

[0040] (2) Transfer the d...

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 diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to a graphite composite negative electrode material, a preparation method thereof, and a lithium ion battery, belonging to the field of lithium ion battery materials. The preparation method of the graphite composite negative electrode material of the present invention comprises the following steps: (1) reacting the solution containing titanium and tin, graphite and nitrogen source at a temperature of 120-200° C. for 6-24 hours, then separating the solid and liquid, and drying to obtain doped Titanium / tin graphite composite material; the nitrogen source is one of aniline, thiophene, pyrrole, and urea; (2) under the mixed atmosphere of carbon source gas and ammonia gas, the doped titanium / tin graphite composite material is heat preservation at 500° C. for 1 to 3 hours, then heat preservation at 800 to 900° C. for 1 to 3 hours, and then cool to obtain a graphite composite negative electrode material. When the graphite composite negative electrode material prepared by the invention is used in a lithium ion battery, the lithium ion battery can have better fast charging performance and cycle performance.

Description

technical field [0001] The invention relates to a graphite composite negative electrode material, a preparation method thereof, and a lithium ion battery, belonging to the field of lithium ion battery materials. Background technique [0002] In recent years, people's demand for pure electric vehicles and hybrid vehicles has grown, and the requirements for power batteries have also increased. However, the long charging time and low energy density of current lithium-ion batteries make them unable to fully meet the needs of new energy vehicles. Therefore, it is urgently desired to further improve the power characteristics and energy density of lithium-ion batteries. Graphite is the most commonly used anode material for lithium-ion batteries, which has the advantages of high energy density, low voltage, good electrical conductivity, abundant resources and low price. However, the layered structure of graphite makes the diffusion rate of lithium ions low and the rate capability ...

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): H01M4/36H01M4/587H01M10/0525H01M10/058
CPCH01M4/366H01M4/587H01M10/0525H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 赵晓锋邱彦星李利淼
Owner CALB CO LTD