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Method for preparing silicon dioxide/porous carbon anode material for lithium-ion battery

A lithium-ion battery, silicon dioxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity and volume expansion of silicon dioxide, and achieve low cost, improved electrical conductivity, and improved rate performance. Effect

Inactive Publication Date: 2016-06-01
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of poor conductivity and volume expansion of silicon dioxide on the one hand, and improves the electrochemical performance of the composite material on the other hand

Method used

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  • Method for preparing silicon dioxide/porous carbon anode material for lithium-ion battery
  • Method for preparing silicon dioxide/porous carbon anode material for lithium-ion battery
  • Method for preparing silicon dioxide/porous carbon anode material for lithium-ion battery

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Embodiment Construction

[0016] Add 1.25g of sodium silicate, 3.75g of glucose, and 16.75g of sodium chloride into 225ml of deionized water for mixing, vigorously stir for 4h, and then dry at 80°C for 12h. Subsequently, the dried precursor was calcined at 650° C. for 2 h in an argon-protected environment to obtain a sodium silicate / carbon composite material. Using the principle of strong acid to make weak acid, a certain amount of hydrochloric acid is added to obtain silicic acid / carbon composite material. Then, drying at a temperature of 170° C. for 5 h, followed by washing with water, finally obtained a silica / porous carbon composite structure.

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Abstract

The invention relates to a method for preparing a silicon dioxide / porous carbon anode material for a lithium-ion battery. The method comprises the following four steps: dissolving sodium silicate, glucose and sodium chloride into deionized water at the mass ratio of (1-1.5) to (3.5-4) to (16-18); drying the prepared solution to obtain a brown caramel precursor; grinding the obtained precursor into fine powder, carrying out calcination, heating the fine powder to 650 DEG C at the rate of 8 DEG C / min and carrying out heat preservation to obtain a silicon dioxide / carbon precursor; putting the silicon dioxide / carbon precursor into concentrated hydrochloric acid by the principle of preparing a weak acid from a strong acid, carrying out drying in an oven at 170 DEG and washing the silicon dioxide / carbon precursor to obtain the silicon dioxide / porous carbon composite material. The silicon dioxide / porous carbon composite material obtains good electrochemical cycling stability and excellent rate capability as a negative electrode of the lithium-ion battery.

Description

Technical field [0001] The invention relates to a method for preparing a negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries are composed of positive and negative electrode materials, electrolyte, separator, current collector, binder, conductive agent, battery case, tabs, etc. Among them, positive and negative electrodes and electrolyte are the most critical technologies to solve the performance of lithium-ion batteries. See Wu Yuping, Yuan Xiangyun, Dong Chao, Duan Jiyuan, Lithium-ion Batteries: Application and Practice, Chemical Industry Press, 2004. As the main lithium storage body of lithium-ion batteries, the negative electrode material realizes the intercalation of lithium ions during charging and discharging and prolapse. [0003] The successful application of carbon materials in lithium secondary batteries has promoted the generation of lithium-ion batteries, and a variety of carbon materials have been extensivel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/38H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 师春生袁志男赵乃勤刘恩佐何春年
Owner TIANJIN UNIV