Preparation method of multilayer structure battery cathode material containing C3N4 composite material

A technology of C3N4 and composite materials, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of high manufacturing cost, low specific capacity, and limitations

Inactive Publication Date: 2016-07-20
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are three types of commercial lithium-ion battery anode materials: graphite-like carbon, graphitizable carbon (soft carbon), and amorphous carbon (hard carbon) materials. However, the theoretical specific capacity of graphite is only 372mAh / g, and the manufacturing cost is high. , poor safety performance; although soft carbon materials have a large number of turbostratic structures and heterogeneous atoms such as hydrogen, which make them have high specific capacity (generally 600-800mAh / g), but their voltage hysteresis is large, and the first Coulombic efficiency Low and fast attenuation, so the practical application is greatly limited; compared with soft carbon materials, hard carbon materials have a lower platform, the first efficiency and cycle life are improved, but the specific capacity is lower than soft carbon materials

Method used

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  • Preparation method of multilayer structure battery cathode material containing C3N4 composite material
  • Preparation method of multilayer structure battery cathode material containing C3N4 composite material
  • Preparation method of multilayer structure battery cathode material containing C3N4 composite material

Examples

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Effect test

Embodiment 1

[0024] The polycyclic aromatic compound and the nitrogen-containing organic compound are uniformly mixed according to the molar ratio of 1:0.5, and then placed in a high-pressure reactor. The polycyclic aromatic compound is: naphthalene, anthracene, pyrene, medium-temperature coal tar pitch, petroleum residue pitch One or more of them; the nitrogen-containing organic compound is: one or more of urea, hexamethylenetetramine, and melamine.

[0025] Replace the air in the reactor with nitrogen, and control the initial pressure of the reactor to be 0-2Mpa;

[0026] The reactor was heated to 400°C at a heating rate of 5°C / min;

[0027] The constant temperature reaction time is controlled at 3 hours, and the product is taken out after the reaction is completed;

[0028] Use chloroform to wash away the unreacted raw materials, and use a membrane filter to carry out suction filtration. When washing the reaction product, the reaction product should be mixed according to the ratio of 1...

Embodiment 2

[0041] After the condensed-ring aromatic compound and the nitrogen-containing organic compound are uniformly mixed according to the molar ratio of 1:5, they are placed in a high-pressure reactor, and the condensed-ring aromatic compound is one of naphthalene, anthracene, pyrene, and medium-temperature coal tar pitch or Various, petroleum residue asphalt; nitrogen-containing organic compounds are: one or more of urea, hexamethylenetetramine, and melamine;

[0042] Replace the air in the reactor with nitrogen, and control the initial pressure of the reactor to be 0-2Mpa;

[0043] The reactor was heated up to 600°C at a heating rate of 5°C / min;

[0044] The constant temperature reaction time is controlled at 6 hours, and the product is taken out after the reaction is completed;

[0045] Use chloroform to wash away the unreacted raw materials, and use a membrane filter to carry out suction filtration. When washing the reaction product, the reaction product should be mixed accordi...

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Abstract

The invention discloses a preparation method of a multilayer structure battery cathode material containing a C3N4 composite material. By adopting the method, a complete carbon layer structure generates lots of defects and active sites which can better capture lithium ions so as to increase the lithium insertion quantity and improve the specific capacity of the cathode material; moreover, a rough-surface copper-plated aluminum foil is selected in structure and has the advantage of large specific surface area, and the relatively large specific surface area and a concave-convex structure can perfectly buffer the volume expansion in the charge/discharge process of tin; and meanwhile, the structure also can perfectly play a role of a skeleton, and the stress of volume expansion/shrinkage in the charge/discharge process is greatly buffered so as to improve the cycle performance of the aluminum/copper/tin/graphite multilayer structure cathode material.

Description

technical field [0001] The present invention relates to a kind of containing C 3 N 4 The invention discloses a preparation method of a battery negative electrode material with a multilayer structure of a composite material. Background technique [0002] Lithium-ion batteries are mainly composed of casing, positive electrode, negative electrode, electrolyte and separator, and the negative electrode material is mainly carbon material. At present, there are three types of commercial lithium-ion battery anode materials: graphite-like carbon, graphitizable carbon (soft carbon), and amorphous carbon (hard carbon) materials. However, the theoretical specific capacity of graphite is only 372mAh / g, and the manufacturing cost is high. , poor safety performance; although soft carbon materials have a large number of turbostratic structures and heterogeneous atoms such as hydrogen, which make them have high specific capacity (generally 600-800mAh / g), but their voltage hysteresis is lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/366H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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