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Silicon oxide composite cathode material with gradient structure and preparation method and application thereof

A silicon oxide and negative electrode material technology, which is applied in the field of lithium-ion batteries, can solve problems such as fragmentation and uneven stress, and achieve the effects of reduced surface pulverization, uniform stress, and simple preparation methods

Active Publication Date: 2019-06-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the silicon oxide material can reduce the volume expansion of the material to a certain extent, due to the repeated volume expansion and contraction of the final material and the uneven stress, the material also begins to crack from the outside to the inside after a certain charge and discharge.

Method used

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  • Silicon oxide composite cathode material with gradient structure and preparation method and application thereof
  • Silicon oxide composite cathode material with gradient structure and preparation method and application thereof
  • Silicon oxide composite cathode material with gradient structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of silicon oxide composite anode material with gradient structure:

[0036](1) Uniformly disperse 40 g of monodisperse silica microspheres with a median diameter D50=300nm on a collecting device and pre-dry;

[0037] (2) The raw materials Si, SiO 2 Separately crushed to micron size, according to Si: SiO 2 The molar ratio of 1:10, 1:2, 1:1, 2:1, 10:1 is fully mixed, and an appropriate amount of deionized water is added for kneading to obtain five Si, SiO 2 Mixed material sample, denoted as A 1 , A 2 , A 3 , A 4 , A 5 ; each weighed 900g (solid content) A 1 , A 2 , A 3 , A 4 , A 5 ;

[0038] (3) First, put A 1 Put it into the furnace cavity, the vacuum cavity 1 is heated up to 200°C at a rate of 10°C per minute in a vacuum state, and kept for 1h to ensure that Si, SiO 2 The moisture in the mixed material sample is fully dried; the collection device is placed above the furnace cavity, and the furnace cavity is heated to 1350°C, A 1 Si and SiO in ...

Embodiment 2

[0048] Preparation of silicon oxide composite anode material with gradient structure:

[0049] (1) Uniformly disperse 40 g of monodisperse silica microspheres with a median diameter D50=100 nm on a collecting device and pre-dry;

[0050] (2) The raw materials Si, SiO 2 Separately crushed to micron size, according to Si: SiO 2 The molar ratio of 1:5, 3:5, 1:1, 5:3, 5:1 is fully mixed, and an appropriate amount of deionized water is added for kneading to obtain five Si, SiO 2 Mixed material sample, denoted as A 1 , A 2 , A 3 , A 4 , A 5 ; each weighed 900g (solid content) A 1 , A 2 , A 3 , A 4 , A 5 ;

[0051] (3) First, put A 1 Put it into the furnace cavity, the vacuum cavity 1 is heated up to 200°C at a rate of 10°C per minute in a vacuum state, and kept for 1h to ensure that Si, SiO 2 The moisture in the mixed material sample is fully dried; the collection device is placed above the furnace cavity, and the furnace cavity is heated to 1350°C, A 1 Si and SiO in ...

Embodiment 3

[0055] Preparation of silicon oxide composite anode material with gradient structure:

[0056] (1) Uniformly disperse 1kg of monodisperse silica microspheres with median diameter D50=1000nm on the collection device and pre-dry;

[0057] (2) The raw materials Si, SiO 2 Separately crushed to micron size, according to Si: SiO 2 The molar ratio of 1:5, 3:5, 1:1, 5:3, 5:1 is fully mixed, and an appropriate amount of deionized water is added for kneading to obtain five Si, SiO 2 Mixed material sample, denoted as A 1 , A 2 , A 3 , A 4 , A 5 ; each weighed 900g (solid content) A 1 , A 2 , A 3 , A 4 , A 5 ;

[0058] (3) First, put A 1 Put it into the furnace cavity, the vacuum cavity 1 is heated up to 200°C at a rate of 10°C per minute in a vacuum state, and kept for 1h to ensure that Si, SiO 2 The moisture in the mixed material sample is fully dried; the collection device is placed above the furnace cavity, and the furnace cavity is heated to 1300 ° C, A 1 Si and SiO in...

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Abstract

The invention discloses a silicon oxide composite cathode material with a gradient structure and a preparation method and application thereof. The silicon oxide composite cathode material with the gradient structure comprises a core-shell structure which is formed by a silicon dioxide layer, a silicon oxide material layer (SiOx) and a carbon coating layer, which are distributed in sequence from inside out, wherein the silicon oxide material layer is a layered structure comprising at least two layers; and a mole ratio of Si to O in the layered structure is gradually increased from inside out. Due to the gradient structure, the stress of silicon oxide is more uniform during volume expansion in the charging process, so that the surface pulverization of particles can be effectively decreased;and meanwhile, the oxygen content in the internal silicon oxide is relatively high, and more byproducts such as lithium oxide, lithium silicate, lithium metasilicate and the like can be generated, sothat the volume expansion generated in the charging process can be further buffered. Moreover, more silicon is concentrated on the outer surface during lithium embedding, so that material polarizationcan be greatly decreased and the performance in lithium ion batteries can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a silicon oxide composite negative electrode material with a gradient structure and a preparation method and application thereof. Background technique [0002] With the development of lithium-ion battery technology, the application range of lithium-ion batteries is also expanding. Since Sony first commercialized lithium-ion batteries in 1991, lithium-ion batteries have gradually become the mainstream power source for consumer electronics. In recent years, the application range of lithium-ion batteries has expanded to high-power and high-energy applications such as electric tools, electric / hybrid vehicles, and energy storage power stations. As such expansion proceeds, existing graphite-based anode materials will not be able to meet the power density and energy density requirements of Li-ion batteries in the foreseeable future. Therefore, looking for next-generation...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCY02E60/10
Inventor 林少雄陆大班王辉许家齐周勇岐
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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