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Core-shell structure composite material and preparation method thereof, and application of core-shell structure composite material in lithium ion battery

A composite material and core-shell structure technology, applied in the field of lithium-ion batteries, can solve the problems of reduced material volume specific capacity, unresolved hard carbon materials, low first-time Coulombic efficiency, etc.

Pending Publication Date: 2020-08-07
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN 107732245A discloses a method for preparing a hard carbon / graphene composite negative electrode material for a lithium battery, which involves stabilizing an organic carbon source, mixing it with lamellar graphene in an organic solvent, and ultrasonically treating it Heating reaction to obtain a composite precursor of hard carbon / graphene; then mix the precursor with nano-spherical metal powder, and perform high-temperature thermal decomposition under the protection of inert gas to form spherical hard carbon coated on the surface of nano-spherical metal powder, and Sandwiched between layered graphene, the hard carbon / graphene composite negative electrode material is obtained; however, the prepared hard carbon material has a low compaction density, which greatly reduces the volume specific capacity of the material
In addition, the problem of the low first Coulombic efficiency of hard carbon materials is not addressed

Method used

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  • Core-shell structure composite material and preparation method thereof, and application of core-shell structure composite material in lithium ion battery
  • Core-shell structure composite material and preparation method thereof, and application of core-shell structure composite material in lithium ion battery
  • Core-shell structure composite material and preparation method thereof, and application of core-shell structure composite material in lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (1) Using plant-based raw materials as a carbon source to prepare hard carbon materials with a particle size of 5 μm-18 μm, specifically including the steps of crushing, carbonization, and jet milling;

[0084] (2) Disperse the above-mentioned plant-based hard carbon material, lithium titanate nanoparticles with a particle size of 30-250nm, and high-temperature petroleum pitch in propanol at a mass ratio of 80:5:15, and dry by rotary evaporation at 30°C, adjusting the speed Be 30.0r / min, obtain coating material precursor;

[0085] (3) Then put it in a box-type furnace, feed argon gas, raise the temperature to 500°C at a heating rate of 2.0°C / min, keep it warm for 2.0h, and naturally cool to room temperature to obtain the third precursor; the third precursor is pulverized, Sieve and demagnetize to obtain the fourth precursor with a particle size of 5.0-45.0 μm, and finally place it in a box furnace, pass in argon gas, raise the temperature to 1100.0°C at a heating rate o...

Embodiment 2

[0089] (1) Preparing hard carbon materials using plant-based raw materials as a carbon source, specifically including the steps of crushing, carbonization, and jet milling;

[0090] (2) Place the above-mentioned plant-based hard carbon material, lithium titanate nanoparticles with a particle size of 30-250nm, and high-temperature petroleum pitch in a fusion machine at a mass ratio of 80:5:15, and adjust the speed to 2000.0r / min. The gap width is 0.5cm, and the fusion is 0.5h to obtain the coating material precursor;

[0091] (3) Then put it in a box-type furnace, feed argon gas, raise the temperature to 500°C at a heating rate of 2.0°C / min, keep it warm for 2.0h, and naturally cool to room temperature to obtain the third precursor; the third precursor is pulverized, Sieve and demagnetize to obtain the fourth precursor with a particle size of 5.0-45.0 μm, and finally place it in a box furnace, pass in argon gas, raise the temperature to 1100.0°C at a heating rate of 2.0°C / min, ...

Embodiment 3

[0094] (1) prepare hard carbon material, as inner core;

[0095] (2) Disperse lithium titanate nanoparticles with a particle size of 30-250nm and high-temperature coal tar pitch in a mass ratio of 5 parts: 15 parts in propanol, dry by rotary evaporation, adjust the speed to 60.0r / min, and rotate to the slurry Completely disperse evenly to obtain a slurry, then place 80 parts of the hard carbon material inner core in the slurry, and react in a rotary evaporator at 55°C for 4 hours to obtain a coating material precursor;

[0096] (3) Then put it in a box-type furnace, feed nitrogen, raise the temperature to 450.0°C at a heating rate of 3.0°C / min, keep it warm for 6.0h, and naturally cool to room temperature to obtain the third precursor; the third precursor is crushed and sieved Separate and demagnetize to obtain the fourth precursor with a particle size of 5.0-45.0 μm, and finally place it in a box furnace, pass in argon gas, raise the temperature to 900.0°C at a heating rate o...

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Abstract

The invention discloses a core-shell structure composite material and a preparation method thereof, and an application of the core-shell structure composite material in a lithium ion battery. In the core-shell structure composite material, the main composition of the core is a hard carbon material, the shell is a composite coating layer formed by compounding nano lithium titanate particles and a carbonized binder, and the nano lithium titanate particles are fixed by the carbonized binder and are dispersed on the surface of the core. The method comprises the following steps: 1) preparing a hardcarbon material as an inner core; 2) by using nano lithium titanate particles, a binder and an inner core as raw materials, fixing nano lithium titanate on the surface of the inner core under the curing action of the binder to obtain a product composed of the inner core and a composite coating layer precursor coating the surface of the inner core; and 3) pre-sintering, and then sintering to obtain the core-shell structure composite material. According to the invention, the core-shell structure composite material has the advantages of high compaction, high capacity, high initial charge-discharge efficiency and good cycling stability, and has a wide application prospect in the field of lithium ion batteries.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a composite material with a core-shell structure, a preparation method thereof and an application in lithium ion batteries. The invention relates to a multi-component composite hard carbon negative electrode material, a preparation method thereof, and a lithium ion battery containing the same. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products and electric vehicles because of their advantages such as high working voltage, long cycle life, no memory effect, small self-discharge, and environmental friendliness. Amorphous carbon materials can be divided into soft carbon and hard carbon according to the difficulty of graphitization. Soft carbon is carbon that can be graphitized at 2500°C or higher, and hard carbon is carbon that is difficult to graphitize at 2500°C or higher. The structural ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCH01M4/366H01M4/583H01M4/485H01M4/621H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 李威李勇汪福明任建国黄友元岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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