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A carbon-silicon composite material for lithium-ion batteries and its preparation method and application

A technology of carbon composite materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unstable SEI films, and achieve the effects of environmental friendliness, low production costs, and simple equipment

Active Publication Date: 2019-06-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these binders enable good electrode connections with little loss of active material, the surface of the silicon particles is still directly exposed to the electrolyte, and the formation of unstable SEI films remains a problem.

Method used

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  • A carbon-silicon composite material for lithium-ion batteries and its preparation method and application
  • A carbon-silicon composite material for lithium-ion batteries and its preparation method and application
  • A carbon-silicon composite material for lithium-ion batteries and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Mix commercial Si and PVP at a mass ratio of 5:1, add alcohol 10 times the mass of PVP, stir, and then dry in a drying oven at 70°C. After drying, carbonize at 550°C for 1h under Ar atmosphere. Add a certain amount of the obtained Si / C core-shell structure product and PVP into the mixed solution of ethanol and deionized water, stir after ultrasonic oscillation, add 3mL ammonia water and tetraethyl orthosilicate (TEOS) with 3.33 times the mass of Si / C during the stirring process, and stir One hour. Put the obtained liquid into a centrifuge to collect the product by centrifugation, and then dry it in a drying oven at 70°C to obtain Si / C / SiO 2 product. Si / C / SiO 2 Mix with PVP at a mass ratio of 5:1, add alcohol and stir, then place in a drying oven to dry at 70°C, and then carbonize at 600°C for 1 hour under Ar atmosphere after drying. The obtained product was etched in 0.4Mol / L NaOH and then centrifuged and dried. The obtained product had a Si / C / void / C composite struct...

Embodiment 2

[0039] Mix commercial Si and PVP at a mass ratio of 2:1, add alcohol 0.5 times the mass of PVP, stir, and then dry in a drying oven at 70°C. After drying, carbonize at 800°C for 1h under Ar atmosphere. Add a certain amount of the obtained Si / C core-shell structure product and PVP into the mixed solution of ethanol and deionized water, stir after ultrasonic oscillation, add 3mL ammonia water and tetraethyl orthosilicate (TEOS) 0.33 times the mass of Si / C during the stirring process, and stir One hour. Put the obtained liquid into a centrifuge to collect the product by centrifugation, and then dry it in a drying oven at 70°C to obtain Si / C / SiO 2 product. Si / C / SiO 2 Mix with PVP at a mass ratio of 3:1, add alcohol and stir, and then dry in a drying oven at 70°C. After drying, carbonize at 550°C for 1 hour under Ar atmosphere. The obtained product was etched in 5Mol / L NaOH and then centrifuged and dried. The obtained product had a Si / C / void / C composite structure. Si accounts f...

Embodiment 3

[0041] Mix commercial Si and PVP at a mass ratio of 4:1, add alcohol 5 times the mass of PVP, stir, and then dry in a drying oven at 70°C. After drying, carbonize at 700°C for 1 hour in an Ar atmosphere. Add a certain amount of the obtained Si / C core-shell structure product and PVP into the mixed solution of ethanol and deionized water, stir after ultrasonic oscillation, add 3mL ammonia water and tetraethyl orthosilicate (TEOS) twice the mass of Si / C during the stirring process, and stir One hour. Put the obtained liquid into a centrifuge to collect the product by centrifugation, and then dry it in a drying oven at 70°C to obtain Si / C / SiO 2 product. Si / C / SiO 2 Mix with PVP at a mass ratio of 2:1, add alcohol and stir, then place in a drying oven to dry at 70°C, and then carbonize at 650°C for 1 hour under Ar atmosphere after drying. The obtained product was etched in 1Mol / L NaOH and then centrifuged and dried. The obtained product had a Si / C / void / C composite structure. Si ...

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Abstract

The invention discloses a silicon / carbon / cavity / carbon composite material for a lithium-ion battery and a preparation method and an application of the silicon / carbon / cavity / carbon composite material. The silicon / carbon / cavity / carbon composite material has a core-shell structure; the core-shell structure comprises a housing and an inner core; the housing is made of carbon; the inner core is formed by coating nano silicon particles with the carbon; a gap layer is arranged between the housing and the inner core; and the preparation method comprises the following steps: sequentially coating the surfaces of the nano silicon particles with a carbon layer I, a silicon dioxide layer and a carbon layer II; and then removing the silicon dioxide layer through an etching method. The preparation method is simple; the cost is low; and the prepared silicon / carbon / cavity / carbon composite material has the advantages of high cycling stability, high coulombic efficiency and the like when applied to lithium-ion battery electrochemistry as a negative electrode material.

Description

technical field [0001] The invention relates to a silicon / carbon / cavity / carbon composite material with a cavity and a preparation method thereof, and to an electrochemical application of a silicon / carbon / cavity / carbon composite material as a negative electrode material of a lithium ion battery, belonging to Lithium-ion battery field. Background technique [0002] Lithium-ion secondary battery has become a research hotspot of new energy due to its advantages of environmental protection, low pollution, low cost, high energy density and long service life, and is expected to become the core technology of electric vehicles in the future. Because of its high energy density, lithium-ion batteries have been successfully used for energy storage in mobile electronic devices, such as smartphones, laptops, and tablets. However, in order to achieve better application of power storage, hybrid electric vehicles and full electric vehicles, there is an imminent need for batteries with highe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/366H01M10/0525Y02E60/10
Inventor 刘军杨林钰陈亚炜李斯特唐莎莎
Owner CENT SOUTH UNIV
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