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A kind of preparation method and application of silicon-based composite material

A silicon-based composite material and particle size technology, which is applied in nanotechnology for materials and surface science, batteries, active material electrodes, etc., can solve the problems of active material capacity attenuation, poor conductivity, and low first effect, and achieve reduction Effects of consumption, high conductivity, high grammage capacity

Active Publication Date: 2022-08-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, silicon oxide materials still face problems such as poor electrical conductivity, low first effect caused by the irreversible reaction of lithium oxide and lithium silicate, and rapid capacity fading during cycling due to repeated expansion and contraction of active materials.

Method used

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  • A kind of preparation method and application of silicon-based composite material
  • A kind of preparation method and application of silicon-based composite material
  • A kind of preparation method and application of silicon-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] refer to figure 1 The shown preparation method of a silicon-based composite material specifically includes the following steps:

[0024] The SiO powder was put into the sucrose solution, and the hydrothermal temperature was kept at 80 °C for 3 h to obtain A.

[0025] After filtering A, put it in a 100°C oven to dry for 12 hours to obtain B.

[0026] Put B into a porcelain boat, put it into a tube furnace, keep the calcination temperature at 800°C for 3h, and heat up at a rate of 3°C / min. Pass argon gas 30min before heating to obtain C.

[0027] According to the sputtering coating method, nano-Cu particles are used as raw materials, and a copper layer is coated on the surface of C to obtain a SiO / C / Cu composite material.

[0028] The SiO / C / Cu composite material prepared in Example 1 was mixed with Super p and silicon-based binder in a ratio of 91:2:7 by weight, coated on copper foil after mixing, and oven at 80°C. After drying for 24 hours, the electrode pole piece is...

Embodiment 2

[0036] A preparation method of a silicon-based composite material, specifically comprising the following steps:

[0037] Put the SiO powder into the sucrose solution and keep the hydrothermal temperature at 100°C for 5h to obtain A;

[0038] After filtering A, put it into an oven at 80 °C to dry for 24 h to obtain B;

[0039] Put B into a porcelain boat, put it into a tube furnace, keep the calcination temperature at 1000°C for 5h, and set the heating rate at 1°C / min, and pass argon gas 60min before heating to obtain C;

[0040] According to the sputtering coating method, nano-Cu particles are used as raw materials, and a copper layer is coated on the surface of C to obtain a SiO / C / Cu composite material.

[0041] The test results of the button electrode sheet prepared by the SiO / C / Cu composite material of Example 2 are the same as those of Example 1.

Embodiment 3

[0043] A preparation method of a silicon-based composite material, specifically comprising the following steps:

[0044] Put the SiO powder into the sucrose solution and keep the hydrothermal temperature at 90°C for 8h to obtain A;

[0045] After filtering A, put it into an oven at 90 °C to dry for 18 hours to obtain B;

[0046] Put B into a porcelain boat, put it into a tube furnace, keep the calcination temperature at 700°C for 8h, and set the heating rate at 5°C / min, and pass argon gas 40min before heating to obtain C;

[0047] According to the sputtering coating method, nano-Cu particles are used as raw materials, and a copper layer is coated on the surface of C to obtain a SiO / C / Cu composite material.

[0048] The test result of the button electrode sheet prepared by the SiO / C / Cu composite material of Example 3 is the same as that of the Example.

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Abstract

The invention relates to a preparation method and application of a novel SiO / C / Cu composite material. The method comprises the following steps: placing SiO powder in a sucrose solution, hydrothermally, drying and calcining to obtain a SiO / C composite material; Nano-Cu particles are used as raw materials, and a Cu layer is coated on the surface of the SiO / C composite material by a sputtering coating method to obtain the SiO / C / Cu composite material; the preparation method of the invention is simple, and has no pollution to the environment, and the obtained SiO / C composite material Both copper and carbon in the / Cu composite have the functions of enhancing electrical conductivity, stabilizing the silicon oxide structure and alleviating the volume expansion. At the same time, the copper on the surface of the SiO / C / Cu composite will prevent the generation of SEI film and reduce the consumption of Li+. By improving the rate performance, the composite material has high gram capacity, high conductivity, high first efficiency and stable cycle performance, and has broad application prospects in the fields of high specific energy batteries, back-end electric vehicles, and energy storage power stations.

Description

technical field [0001] The invention relates to the field of electrode composite materials, in particular to a preparation method and application of a silicon-based composite material. Background technique [0002] With the increasing demand for lithium-ion batteries with high energy density and long cycle life, researchers continue to explore new electrode materials. Silicon and abundant sources have attracted extensive attention and are considered to be the most promising next-generation anode materials; however, the volume expansion of silicon materials leads to the pulverization of reactant particles and electrode fragmentation, resulting in a sharp decrease in capacity and poor reversibility. [0003] Compared with silicon, silicon oxide has better cycling stability, mainly due to the in situ generation of lithium oxide and lithium silicate, which acts as a buffer to slow down the volume expansion through the alloying and dealloying of silicon and lithium. ; In additio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/62H01M4/131H01M10/0525B82Y30/00
CPCH01M4/483H01M4/626H01M4/625H01M4/628H01M4/131H01M10/0525B82Y30/00H01M2004/027H01M2220/20Y02E60/10
Inventor 辛利君林少雄许家齐王辉蔡桂凡辛昱陈龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY