Composite anode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as volume expansion, active material shedding, and poor conductivity of nano-silicon, and achieve improved Conductivity, low cost, and improved stability

Active Publication Date: 2018-10-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the interface stability between nano-silicon material and electrolyte, and solve the problem of poor conductivity of nano-silicon and its volume expansion in the circulation process and the resulting active material falling off, the present invention designs a method based on silicon oxide, manganese source and net Shaped conductive polymer, one-step reduction-carbonization by in-situ chemical reaction to generate self-supporting nano-silicon anode material co-coated with conductive carbon network and silicon-manganese alloy

Method used

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  • Composite anode material of lithium ion battery and preparation method thereof
  • Composite anode material of lithium ion battery and preparation method thereof
  • Composite anode material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Dissolve 0.45g of cetyltrimethylammonium bromide particles in 100mL of hydrochloric acid solution with a concentration of 1mol / L at 3°C, then add 0.5g of manganese acetate and disperse with ultrasonic stirring for 20min at an ultrasonic frequency of 80Hz. Then add 0.2g of nano silicon dioxide, after stirring evenly, continue to ultrasonically disperse for 30min, the ultrasonic frequency is 100Hz, keep the temperature constant during the process, then add 0.8g of ammonium peroxodisulfate, and stir vigorously, and add dropwise after white emulsion appears 1 mL of pyrrole was reacted for 8 h and the resulting solution was lyophilized. Control the mass ratio of the obtained intermediate product to sodium chloride at 1:13, add magnesium powder and sodium chloride, grind, and obtain the precursor after 20 minutes. The precursor was burned in two stages in an inert atmosphere, reacted at 118°C for 2 hours, the heating rate was 2°C / min, and then reacted at 650°C for 5 hours, th...

Embodiment 2

[0039] Dissolve 0.35g of cetyltrimethylammonium bromide particles in 120mL hydrochloric acid solution with a concentration of 3mol / L at 2.5°C, then add 0.8g of manganese acetate and disperse with ultrasonic stirring for 20min at a frequency of 40Hz. Then add 2.0g of nano silicon dioxide, after stirring evenly, continue to ultrasonically disperse for 45min, the ultrasonic frequency is 120Hz, keep the temperature constant during the process, then add 1.0g of ammonium peroxodisulfate, stir vigorously, and add dropwise after white emulsion appears 0.5 mL of pyrrole was reacted for 16 h and the resulting solution was lyophilized. Control the mass ratio of the obtained intermediate product to sodium chloride at 1:10, add magnesium powder and sodium chloride, grind, and obtain the precursor after 20 minutes. The precursor was fired in two stages in an inert atmosphere, reacted at 158°C for 2 hours, the heating rate was 1°C / min, and then reacted at 700°C for 5 hours, the heating rate ...

Embodiment 3

[0042] Dissolve 0.55g of cetyltrimethylammonium bromide particles in 200mL of hydrochloric acid solution with a concentration of 1.5mol / L at 5°C, then add 0.5g of manganese acetate and disperse with ultrasonic stirring for 60min at an ultrasonic frequency of 20Hz. Then add 1.5g of nano-silica, stir evenly, continue to ultrasonically disperse for 45min, the ultrasonic frequency is 120Hz, keep the temperature constant during the process, then add 1.0g of ammonium peroxodisulfate, stir vigorously, and add dropwise after white emulsion appears 0.2 mL of pyrrole was reacted for 24 h and the resulting solution was lyophilized. Control the mass ratio of the obtained intermediate product to sodium chloride at 1:10, add magnesium powder and sodium chloride, grind, and obtain the precursor after 20 minutes. The precursor was fired in two stages in an inert atmosphere, reacted at 300°C for 4 hours, the heating rate was 3°C / min, and then reacted at 650°C for 5 hours, the heating rate was ...

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Abstract

The invention discloses a composite anode material of a lithium ion battery. According to the composite anode material, nano silicon co-coated with a conductive carbon network and a silicon-manganesealloy is served as an active substance, a manganese source is dispersed in a medium and is uniformly dispersed on the surface of silicon oxide by stirring, the surfaces of the particles are coated with a reticulate conductive polymer in situ, and an obtained precursor is subjected to high-temperature heat treatment so as to prepare a self-supporting material co-coated with the conductive carbon network and the silicon-manganese alloy. The invention further provides a preparation method for the nano-silicon self-supporting anode material co-coated with the carbon network and the silicon-manganese alloy. The preparation method has the advantage that the cycling stability and the rate capability of the anode material can be effectively improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery composite negative electrode materials, and specifically relates to a silicon-based composite material co-coated with conductive carbon mesh and silicon alloy prepared by one-step reduction-carbonization of silicon oxide, manganese source and conductive polymer. Background technique [0002] With the development of human society, the energy crisis and environmental issues have increasingly become the focus of attention. The clean and efficient use of traditional energy and the development of new energy technologies have become the main trend. Lithium-ion batteries have high performance, safety and environmental protection It is currently the most promising high-energy green secondary battery for development and application prospects. However, in recent years, the demand for battery energy density in various fields has increased rapidly. In particular, the country has accelerated the promotion and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 郭华军彭伟佳李新海王志兴周玉王接喜彭文杰胡启阳
Owner CENT SOUTH UNIV
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