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Lithium ion battery cathode material and preparation method thereof

A technology of lithium ion battery and negative electrode material, applied in the field of electrochemistry, can solve the problem that the volume change cannot be well alleviated, and achieve the effects of improving cycle stability, buffering volume change and reducing contact

Active Publication Date: 2013-10-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses carboxymethyl cellulose as a binder, which can effectively cover and bond silicon-carbon materials, prevent the pulverization of silicon during charging and discharging, and effectively improve the cycle performance of silicon-carbon composite materials. The huge volume change during the discharge process cannot be well alleviated, and needs to be further improved

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a preparation method for the above lithium ion battery negative electrode material, which includes the following steps: A) mixing silicon particles, the second amorphous carbon precursor and the first ball milling medium, performing ball milling in a protective atmosphere, and then spray drying to produce Granules to obtain the first compound; B) Mix the first compound, carbon material, first amorphous carbon precursor and the second ball milling medium, perform ball milling in a protective atmosphere, spray dry and granulate to obtain the second Two composites; C) Calcining the second composite in a protective atmosphere to obtain a negative electrode material for a lithium ion battery.

[0034] All the raw materials in the present invention are commercially available, and there is no special limitation.

[0035] The silicon particles, the first amorphous carbon precursor, the carbon material, and the second amorphous carbon precurso...

Embodiment 1

[0045] 1.1 Add 0.5kg of silicon powder with a purity of 99.99% and 0.15kg of glucose into a ball milling tank, then add absolute ethanol as the ball milling medium, and under the protection of an argon atmosphere, perform 400rpm high-energy mechanical ball milling for 8 hours to obtain the first composite slurry .

[0046] 1.2 Pour the first composite slurry obtained in 1.1 into a centrifugal spray dryer, adjust the temperature of the centrifugal spray dryer to 120°C, and adjust the wind speed to control the particle size D50 of the dry granulation to 5 μm to obtain the first composite .

[0047] 1.3 Add 0.3kg of the first compound obtained in 1.2 and 0.3kg of mesophase carbon microspheres to the ball milling tank, then add 0.24kg of glucose, and finally add absolute ethanol as the ball milling medium, under the protection of argon atmosphere, 400rpm High-energy mechanical ball milling for 8 hours to obtain the second composite slurry.

[0048] 1.4 Pour the second compound s...

Embodiment 2

[0055] 2.1 Add 0.5 kg of silicon powder with a purity of 99.99% and 0.1 kg of phenolic resin to a ball milling tank, then add acetone as the ball milling medium, and perform 400 rpm high-energy mechanical ball milling for 8 hours under the protection of an argon atmosphere to obtain the first composite slurry.

[0056] 2.2 Pour the first composite slurry obtained in 2.1 into a centrifugal spray dryer, adjust the temperature of the centrifugal spray dryer to 150°C, and adjust the wind speed to control the particle size D50 of drying and granulation to 5 μm to obtain the first composite .

[0057] 2.3 Add 0.3kg of the first compound obtained in 2.2 and 0.2kg of natural graphite to the ball milling tank, then add 0.2kg of phenolic resin, and finally add acetone as the ball milling medium, under the protection of argon atmosphere, 400rpm high-energy mechanical ball milling for 8h , to obtain the second composite slurry.

[0058] 2.4 Pour the second compound slurry obtained in 2.3...

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Abstract

The invention provides a lithium ion battery cathode material and a preparation method of the lithium ion battery cathode material. The lithium ion battery cathode material comprises an inner core and an outer shell wrapping the inner core, a hollow layer exists between the outer shell and the inner core, the inner core is made of a Si-C composite material, the outer shell is made of a C composite material, and the C composite material is formed by a C material and a first amorphous carbon precursor. Compared with the existing Si-C composite material, the hollow layer between the inner core Si-C composite material and the outer shell C composite material can buffer enormous volume change of Si particles in the discharge process, thus endowing the cathode material with good cycle performance; and at the same time, the outer shell can be buffer volume change, reduce stress, improve cycling stability of electrodes, reduce contact between active substances and an electrolyte, improve first coulombic efficiency of an electrode, prevent nanoparticle aggregation and enhance electrode conductivity.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a negative electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, wide operating temperature range, stable discharge, small size, light weight, no memory effect, and environmental friendliness. Therefore, they are widely used in portable electronic devices, electric vehicles, space technology, and defense industries. and other fields have shown broad application prospects. Moreover, with the increasing demand for high-capacity and long-life batteries in mobile electronic devices, people have put forward higher requirements for the performance of lithium-ion batteries, and negative electrode materials are important factors for improving the energy and cycle life of lithium-ion batteries. has been extensively studied w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/38H01M4/62
CPCY02E60/10
Inventor 李志虎裴晓英夏永高刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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