Preparation method of silicon-oxygen negative electrode material of lithium ion battery, negative electrode material and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of large volume expansion, poor electrical conductivity, and low first cycle efficiency, and achieve high porosity and interlayer structure. Stable, easy-to-use equipment

Inactive Publication Date: 2021-04-06
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the objectives of the present invention is to provide a method for preparing a silicon-oxygen negative electrode material for lithium-ion batteries, so as to solve the problems of low initial cycle efficiency, poor electrical conductivity and large volume expansion of current SiO negative electrode materials

Method used

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  • Preparation method of silicon-oxygen negative electrode material of lithium ion battery, negative electrode material and lithium ion battery
  • Preparation method of silicon-oxygen negative electrode material of lithium ion battery, negative electrode material and lithium ion battery
  • Preparation method of silicon-oxygen negative electrode material of lithium ion battery, negative electrode material and lithium ion battery

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Embodiment 1

[0034] A method for preparing a lithium-ion battery silicon-oxygen negative electrode material, comprising the following steps:

[0035] (1) Preparation of cracked silica particles:

[0036] 1.1 Weigh 40g of SiO powder and add it to a 5:6:2 mixture of dimethyl sulfone, formamide, and polyethylene glycol, ultrasonically disperse for 24 hours; centrifuge, take out the silicon oxide particles, and place them in an oven at 50°C to dry for 24 hours. hours, to obtain intercalated silica particles;

[0037] 1.2 Add the intercalated silicon-oxygen particles into the molten 2:1 mixture of sodium chloride and magnesium chloride to disperse to obtain a molten mixture, which is rapidly frozen with liquid nitrogen to obtain a low-temperature mixture;

[0038] 1.3 The low-temperature mixture is rapidly heated by microwaves, so that the surface of the low-temperature mixture is cracked, cleaned and filtered, and cracked silicon oxide particles are obtained;

[0039] (2) Preparation of carb...

Embodiment 2

[0041] A method for preparing a lithium-ion battery silicon-oxygen negative electrode material, comprising the following steps:

[0042] (1) Preparation of cracked silica particles:

[0043] 1.1 Weigh 40g of SiO powder and add it to a 5:6:2 mixture of dimethyl sulfone, formamide, and polyethylene glycol, ultrasonically disperse for 24 hours; centrifuge, take out the silicon oxide particles, and place them in an oven at 50°C to dry for 24 hours. hours, to obtain intercalated silica particles;

[0044] 1.2 Add the intercalated silicon-oxygen particles into the molten 2:1 mixture of sodium chloride and magnesium chloride to disperse to obtain a molten mixture, which is rapidly frozen with liquid nitrogen to obtain a low-temperature mixture;

[0045] 1.3 The low-temperature mixture is rapidly heated by microwaves, so that the surface of the low-temperature mixture is cracked, cleaned and filtered, and cracked silicon oxide particles are obtained;

[0046] (2) Preparation of carb...

Embodiment 3

[0052] A method for preparing a lithium-ion battery silicon-oxygen negative electrode material, comprising the following steps:

[0053] (1) Preparation of cracked silica particles:

[0054] 1.1 Weigh 50g of SiO powder and add it to a 5:6:2 mixture of dimethyl sulfone, formamide, and polyethylene glycol, ultrasonically disperse for 24 hours; centrifuge, take out the silicon oxide particles, and place them in an oven at 100°C to dry for 24 hours. hours, to obtain intercalated silica particles;

[0055] 1.2 Add the intercalated silicon-oxygen particles into the molten 2:2 mixture of sodium chloride and magnesium chloride to disperse to obtain a molten mixture, and then freeze the molten mixture rapidly with liquid nitrogen to obtain a low-temperature mixture;

[0056] 1.3 The low-temperature mixture is rapidly heated by microwaves, so that the surface of the low-temperature mixture is cracked, cleaned and filtered, and cracked silicon oxide particles are obtained;

[0057] (2)...

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Abstract

The invention provides a preparation method of a silicon-oxygen negative electrode material of a lithium ion battery, which comprises the following steps: preparing intercalated silicon-oxygen particles, carrying out freezing to embrittle the particles, conducting heating to generate cracks, thereby obtaining cracked silicon-oxygen particles, and carrying out carbon coating on the surfaces of the silicon-oxygen particles. The problems that existing SiO is low in first-time circulation efficiency, poor in conductivity and large in volume expansion are effectively solved. The obtained cracked silicon-oxygen particles are high in porosity and more in sites of lithium ion embedding, the interlayer structure of the silicon-oxygen particles is stable, the particles are not prone to breakage, and the problem of volume expansion caused in the lithium ion deintercalation process is effectively relieved; and meanwhile, the obtained cracked silicon-oxygen particles are relatively small in particle size, and the absolute volume change of silicon is correspondingly reduced, so that the internal stress of silicon caused by volume expansion is effectively reduced, the damage to an electrode structure is reduced, the transmission paths of charges and lithium ions are effectively shortened, and the first-time cycle efficiency of the electrode is improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for preparing a silicon-oxygen negative electrode material for a lithium ion battery, the negative electrode material and the lithium ion battery. Background technique [0002] With the rapid development of the world economy, energy shortages, environmental pollution and other issues have become severe challenges that all countries must face on the road to sustainable development. Green and clean energy has gradually become the focus of everyone's attention. Among them, lithium-ion batteries are widely used in electric vehicles and 3C products due to their high energy density, working voltage, fast charging speed, safety and pollution-free. As a key factor in the development of lithium-ion batteries, negative electrode materials are mainly graphite materials, whose specific capacity is close to the theoretical value, and it is difficult to increase its capacity by modify...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/483H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 郭雅芳李富海陈宗飞马斌陈杰李载波杨山
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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