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Nano-silicon composite negative electrode material and manufacturing method thereof

A negative electrode material, nano-silicon technology, applied in negative electrodes, nanotechnology, nanotechnology, etc., can solve the problems of battery capacity attenuation, affecting battery electrochemical performance, battery energy density reduction, etc., to inhibit volume expansion and contraction, improve Cycle and rate performance, the effect of reducing the internal resistance of the battery

Active Publication Date: 2021-02-12
TOMI CHENGDU APPLIED TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to a rapid decline in battery capacity
In addition, the conductivity of silicon material is only 6.7×10 -4 S / cm, the conductivity is very poor, which also seriously affects the electrochemical performance of the battery
Many of the above shortcomings have greatly hindered the practical application of silicon anode materials in the field of lithium-ion batteries.
[0006] There are significant defects in silicon anode materials: during the process of intercalating lithium, silicon particles have a volume expansion of up to 300%, and silicon particles have a large volume shrinkage during delithiation
The addition of a large number of carbon nanotubes leads to serious problems such as a significant decrease in the first Coulombic efficiency of the battery and a decrease in the energy density of the battery.

Method used

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  • Nano-silicon composite negative electrode material and manufacturing method thereof
  • Nano-silicon composite negative electrode material and manufacturing method thereof
  • Nano-silicon composite negative electrode material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Take 200 g of N-methylpyrrolidone, add 45 g of phenolic resin, 37.5 g of butyl titanate, 12 g of carboxymethyl cellulose, and 150 g of nano-silica powder. The primary particle size of the silicon powder body is 110 nm. Ф5 zirconia ball stirring mill wet grinding for 10 minutes, vacuum rotary drying, add 30 grams of ferrocene, Ф10 vibrating ball mill dry vibration grinding for 15 minutes. Then put the powder into a 310S stainless steel airtight container, and seal it strictly with a brass sealing ring after vacuuming. Put it in a muffle furnace, heat up from room temperature to 600°C for 3 hours, keep at 600°C for 36 hours, then cool down to 300°C with the furnace, take it out, pour water and cool it down to room temperature rapidly. Open the sealing cap and take out the composite material sample. The scanning electron micrograph of the in-situ growth carbon nanotube / multi-coated nano-silicon composite negative electrode material prepared in embodiment 1 is as follows ...

Embodiment 2

[0056] Take 300g of cyclohexane, add 30g of phenolic resin, 30g of propyl titanate, 10g of starch, 150g of nano-silicon powder, wet grinding with Ф5 zirconia ball stirring mill for 10 minutes, vacuum rotary drying, add ferrocene 25 grams, Ф10 vibrating ball mill dry vibration grinding for 15 minutes. Then put the powder into a 310S stainless steel airtight container, and seal it strictly with a brass sealing ring after vacuuming. Put it in a muffle furnace, heat up from room temperature to 650°C for 3 hours, keep at 650°C for 30 hours, then cool down to 300°C with the furnace, take it out, pour water and cool it down to room temperature rapidly. Open the sealing cap and take out the composite material sample. Take 1.7 grams of conductive carbon black SuperP, add 40 grams of N-methylpyrrolidone, grind, add 15 grams of self-made polyamic acid binder, and grind. Add 15 grams of the silicon-based composite powder material prepared above, stir evenly, and obtain a slurry with a v...

Embodiment 3

[0058] Take 250g of xylene, add 25g of phenolic resin, 45g of butyl zirconate, 15g of glucose, 150g of nano-silicon powder, wet grinding with Ф5 zirconia ball stirring mill for 10 minutes, vacuum rotary drying, and then add 20g of ferrocene , Ф10 vibration ball mill dry vibration grinding for 15 minutes. Then put the powder into a 310S stainless steel airtight container, and seal it strictly with a brass sealing ring after vacuuming. Put it in a muffle furnace, heat up from room temperature to 700°C for 3 hours, keep it at 700°C for 25 hours, then cool to 300°C with the furnace, take it out, pour water and cool it down to room temperature rapidly. Open the sealing cap and take out the composite material sample. Take 1.8 grams of conductive carbon black SuperP, add 40 grams of N-methylpyrrolidone, grind, add 15 grams of self-made polyamic acid binder, and grind. Add 15 grams of the silicon-based composite powder material prepared above, stir evenly, and obtain a slurry with a...

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Abstract

The invention relates to a nano-silicon composite negative electrode material and a manufacturing method thereof. The nano-silicon composite negative electrode material comprises multi-coated nano-silicon powder and carbon nanotubes growing in situ, the multi-coated nano-silicon powder is provided with a core part with nano-silicon particles and a composite coating layer arranged on the core part,and the composite coating layer comprises conductive carbon, polyacene and inorganic metal oxide.

Description

technical field [0001] The invention relates to the technical field of battery materials, and more specifically relates to a nano-silicon composite negative electrode material and a manufacturing method thereof. Background technique [0002] In today's world, the excessive consumption of fossil fuels and the ensuing environmental problems seriously restrict the development of human society. Building a new type of society with high efficiency, energy saving, low carbon and environmental protection has become the goal of all countries in the world. In the 21st century, mankind has officially entered the era of electric vehicles. China's electric vehicle industry has experienced explosive growth since 2015, and by 2020 China's production capacity of pure electric vehicles and plug-in hybrid vehicles will reach 2 million. To improve the cruising range of electric vehicles under the premise of ensuring safety, it is necessary to increase the energy density of batteries. Accord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 喻维杰李福生张锡强赵常代学志詹勇军
Owner TOMI CHENGDU APPLIED TECH RES INST CO LTD
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