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High-performance carbon-based negative electrode material for lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, batteries, negative electrodes, etc., can solve problems such as hindering the large-scale application of materials, poor conductivity of electrode materials, matching electrode characteristics, etc., to achieve excellent electrochemical performance, reduce The effect of roasting temperature and reducing energy consumption

Active Publication Date: 2018-02-23
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these new materials have achieved several times higher specific capacity than commercial graphite, the electrode materials have poor conductivity, and the huge volume changes inside the electrode materials during repeated charging and discharging lead to rapid decline in battery life. Disadvantages such as matching with today's mature lithium-ion battery system have greatly hindered the actual large-scale application of these materials

Method used

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  • High-performance carbon-based negative electrode material for lithium ion battery and preparation method thereof
  • High-performance carbon-based negative electrode material for lithium ion battery and preparation method thereof
  • High-performance carbon-based negative electrode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of graphene / nitrogen-doped porous carbon and electrochemical performance test of assembled simulated battery.

[0032] 0.7g of chitosan was dissolved in 25mL of deionized water, and 5mL of 1mol / L dilute hydrochloric acid was added to help dissolve, fully stirred and dissolved to obtain light yellow clear solution A, wherein the concentration of chitosan was 2.3wt%. 50 mg of graphite oxide was uniformly dispersed in 40 mL of deionized water, and ultrasonically peeled for 2 hours to obtain graphene oxide dispersion B, wherein the concentration of graphite oxide was 0.12 wt%. The solution A and the dispersion B were uniformly mixed and stirred overnight, heated and stirred at 90°C until gelatinous, and then completely dried in a blast drying oven to obtain a precursor powder. Take 0.4g of the precursor and 4g of zinc chloride powder and mix them evenly, then bake at 600°C for 2 hours in an argon atmosphere, and then wash them repeatedly with 1mol / L d...

Embodiment 2

[0034] Example 2: Preparation of carbon nanotube / nitrogen-doped carbon composite material and electrochemical performance test of assembled simulated battery.

[0035]Dissolve 0.7g chitosan in 115mL deionized water, and add 5mL of 1mol / L dilute hydrochloric acid to help dissolve, fully stir and dissolve to obtain light yellow or colorless clear solution A, wherein the concentration of chitosan is 0.58wt%. Uniformly disperse 50mg of carbon nanotubes in 40mL of deionized water to obtain dispersion B, in which the concentration of carbon nanotubes is 0.2wt%. Mix solution A and dispersion B uniformly and stir overnight, heat and stir at 80°C until gelatinous , and completely dried in a blast drying oven to obtain a precursor powder. Take 0.4g of the precursor and 4g of zinc chloride powder and mix them evenly, then bake at 600°C for 2 hours in an argon atmosphere, and then wash them repeatedly with 1mol / L dilute hydrochloric acid and deionized water to completely remove the metal ...

Embodiment 3

[0036] Example 3: Preparation of carbon nanotube / porous carbon composite material and electrochemical performance test of assembled simulated battery.

[0037] Dissolve 0.7 g of glucose in 50 mL of deionized water, stir and dissolve to obtain a colorless clear solution A, wherein the concentration of glucose is 1.4 wt%. Uniformly disperse 50mg of carbon nanotubes in 40mL of deionized water to obtain dispersion B, in which the concentration of carbon nanotubes is 0.12wt%. Mix solution A and dispersion B uniformly and stir overnight, heat and stir at 90°C until gel , and completely dried in a blast drying oven to obtain a precursor powder. Take 0.4g of the precursor and 6g of zinc chloride powder and mix them evenly, then bake at 700°C for 3 hours under pure nitrogen atmosphere, and then wash with 1mol / L dilute hydrochloric acid and deionized water repeatedly to completely remove the metal salt impurities in the material , and the final product was obtained after drying, with t...

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Abstract

The invention provides a high-performance carbon-based negative electrode material suitable for a lithium ion battery and a preparing method thereof. An improved fused salt heating method is used as the preparing method, a three-dimensional structure carbon material having the high specific surface and microtopography at the same time is obtained. The morphology structure is characterized in that a conductive one-dimensional linear carbon material or a conductive two-dimensional sheet-shaped carbon material serves as a framework, and the outer surface of the framework is evenly coated with porous carbon particles. The carbon material serves as the high-performance negative electrode material of the lithium ion battery and has the advantages of being high in mass energy density, good in large-current discharging capacity, long in service life, environmentally friendly and free of heavy metal elements. The preparing method is simple, low in requirement for reaction devices and suitable for industrial production.

Description

technical field [0001] The invention relates to a high-performance carbon-based negative electrode material for a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion battery electrode materials. Background technique [0002] As an important electrochemical energy storage device, rechargeable lithium ion batteries (rechargeable lithium ion batteries) have achieved great success in mobile electronic devices such as mobile phones, notebook computers and so on. However, the new generation of electronic devices, such as electric vehicles and wearable electronic devices, have put forward new requirements for lithium-ion batteries. Production and application create new opportunities and challenges. In order to substantially achieve greater breakthroughs in the power density, energy density, life, and safety of lithium-ion batteries, key components in lithium-ion batteries need to be innovated urgently. [0003] The classic lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/362H01M4/583H01M10/0525H01M2004/021H01M2004/027H01M2220/20H01M2220/30Y02E60/10
Inventor 邵宗平邓翔赵伯特
Owner NANJING TECH UNIV
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