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

Lithium ion battery negative electrode material containing onion-shaped fullerene and preparation method thereof

An onion-like fullerene, lithium-ion battery technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as lithium-ion battery safety accidents, end of battery life, and poor lithium intercalation-delithiation capabilities.

Pending Publication Date: 2020-09-15
华富(江苏)锂电新技术有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the conditions of high-rate charge and discharge above 2C and high temperature of 65°C and below 0°C, the structure of the negative electrode carbon material is more likely to undergo irreversible collapse, making its ability to intercalate and delithiate lithium worse, and cannot enter the negative electrode carbon material Lithium ions in the battery will produce lithium precipitation on the negative electrode, resulting in the end of battery life and possible safety accidents of lithium-ion batteries.

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 ion battery negative electrode material containing onion-shaped fullerene and preparation method thereof
  • Lithium ion battery negative electrode material containing onion-shaped fullerene and preparation method thereof
  • Lithium ion battery negative electrode material containing onion-shaped fullerene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, according to the carbon material for lithium-ion batteries 40%, C 20 The outer shell of the core is 3 layers of onion-like fullerene 2%, conductive agent 1%, binder 1%, N-methylpyrrolidone 56% by weight and weigh each component.

[0022] Secondly, the lithium cobalt oxide material, onion-like fullerene and conductive agent and other powdery materials are evenly mixed, and then mixed with other materials to obtain a negative electrode material containing onion-like fullerene for lithium-ion batteries.

Embodiment 2

[0024] First, according to the carbon material for lithium ion battery 45%, C 80 5% of onion-like fullerene, 2% of conductive agent, 3% of binder, and 45% of N-methylpyrrolidone were weighed for the weight percentage of the 21 layers of the core.

[0025] Secondly, after uniformly mixing the carbon material, onion-like fullerene and conductive agent and other powdery materials, and then mixing with other materials, a negative electrode material containing onion-like fullerene for lithium ion batteries is obtained.

Embodiment 3

[0027] First, according to carbon materials for lithium-ion batteries 42%, C 20 21 layers of onion-like fullerenes for the outer shell of the nucleus 1%, C 60 13 layers of onion-like fullerenes for the outer shell of the nucleus 1%, C 72 1% of onion-like fullerene, 1.5% of conductive agent, 2.5% of binder, and 51% of N-methylpyrrolidone were weighed for the weight percentage of each component.

[0028] Secondly, after uniformly mixing the carbon material, onion-like fullerene and conductive agent and other powdery materials, and then mixing with other materials, a negative electrode material containing onion-like fullerene for lithium ion batteries is obtained.

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

No PUM Login to View More

Abstract

The invention relates to a lithium ion battery negative electrode material containing onion-shaped fullerene and a preparation method thereof. The lithium ion battery negative electrode material comprises the following components in percentage by mass: 40-45% of a carbon material, 2-5% of onion-shaped fullerene, 1-2% of a conductive agent, 1-3% of an adhesive and 45-56% of N-methyl pyrrolidone. The method comprises the steps of stirring the carbon material, the onion-shaped fullerene, the conductive agent and the adhesive in a double-planet vacuum stirrer under the pressure of 0MPa; under thepressure of 0MPa, adding NMP into the premixed powder, and stirring; stirring under the pressure of -0.08MPa; stirring under the pressure of -0.08MPa; and sieving the mixed positive electrode slurry with a 150-mesh sieve. On the one hand, a lithium intercalation-deintercalation channel of the carbon material can be increased, the lithium intercalation-deintercalation capacity of the carbon material is improved, and the occurrence of a lithium precipitation phenomenon is reduced, so that the safety of the lithium ion battery is improved; and on the other hand, due to the multi-layer core-shellstructure of the onion-shaped fullerene, the structural stress change of the carbon material in the cycle process of the lithium ion battery can be relieved, the stability of the lithium ion battery is improved, and the cycle life of the lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material containing onion-like fullerene and a preparation method thereof, belonging to the technical field of chemical power source materials. Background technique [0002] With the continuous progress and development of lithium-ion battery technology, it has been used in many fields such as digital electronic products, energy storage, power, and new energy vehicles. Lithium-ion batteries have the advantages of light weight, high energy density, and high-rate charge-discharge performance, but the market still hopes that the safety and cycle life of lithium-ion batteries can be further improved. One of the important factors that determine the safety and cycle life of lithium-ion batteries is their lithium intercalation-delithiation stability. The irreversible collapse of the structure of the carbon material in the negative electrode material during the continuous lithium intercalation-d...

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): H01M4/583H01M4/62H01M10/0525
CPCH01M4/583H01M4/62H01M4/621H01M4/624H01M10/0525H01M2004/027Y02E60/10
Inventor 吴战宇王大林姜庆海施晓渝成辰蒋仕平沙树勇朱明海董志成孟云尤兆坤
Owner 华富(江苏)锂电新技术有限公司