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Method for increasing electrochemical lithium storage content of nano-carbon tube

A carbon nanotube, electrochemical technology, applied in the direction of circuit, electrode manufacturing, electrical components, etc., can solve the problems of low output voltage, small output, high cost, etc., achieve large output current, improve utilization rate, and increase diffusion coefficient Effect

Inactive Publication Date: 2005-10-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the single-walled carbon nanotubes prepared by the laser method in this patent have high cost and low yield; at the same time, 50% of the electrochemical capacity of the single-walled carbon nanotubes processed by this method is shown as a voltage above 1.0V, which is not suitable for its application to lithium In ion batteries, it brings the disadvantage of low output voltage

Method used

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  • Method for increasing electrochemical lithium storage content of nano-carbon tube
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  • Method for increasing electrochemical lithium storage content of nano-carbon tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Immerse 500mg of native MWNTs in 40ml of H with different volume ratios 2 SO 4 : HNO 3 = 8:2 mixed solution, ultrasonic vibration for 0.5h, mechanical stirring for 0.5h, soaking treatment for 10h, temperature 60°C. The reaction product was washed with deionized water until it was neutral, heated at 500°C for 2 hours in an air atmosphere, and then cooled and allowed to stand for 10 hours. The product was soaked in 2wt% LiOH solution for 10 hours, and the obtained sample was washed with deionized water, filtered, and vacuum-dried, and then assembled into a button battery for electrochemical performance testing.

Embodiment 2

[0017] Immerse 300mg of native MWNTs in 30ml of H with different volume ratios 2 SO 4 : HNO 3 = 8:2 mixed solution, ultrasonic vibration for 2.5h, mechanical stirring for 2.5h, soaking treatment for 10h, temperature 60°C. The reaction product was washed with deionized water until neutral, heated at 350° C. for 2 h under an air atmosphere, and then cooled and allowed to stand for 10 h. Products with saturated Li 2 CO 3 The solution was soaked for 4 hours, and the obtained samples were washed with deionized water, filtered, dried in vacuum and then assembled into button batteries for electrochemical performance testing.

Embodiment 3

[0019] Immerse 1g of native MWNTs in 40ml of H with different volume ratios 2 SO 4 : HNO 3 = 6:4 mixed solution, ultrasonic vibration for 2h, mechanical stirring for 1.5h, soaking treatment for 10h, temperature 50°C. The reaction product was washed with deionized water until it was neutral, heated at 500°C for 1.5h under an air atmosphere, and cooled for 10h. The product was soaked in 2wt% LiOH solution for 16 hours, and the obtained sample was washed with deionized water, filtered, dried in vacuum, and then assembled into a button battery for electrochemical performance testing.

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Abstract

This invention discloses a method for increasing electrochemical Li-storage capacity of carbon nm tubes, which processes the original MWNTS raw material prepared with chemical gas phase deposition method including: first of all, the original MWNTS is supersonic-vibrated, mechanical mixed and dipped under room temperature in different matched volumes of H2SO4 and HNO3 mixed solution, the reacted product is cleaned with deionized water to neutral and put in a tube oven to be heated under 200-500deg.C to be cooled and dipped in Li2CO3 or LiOH solution, the obtained sample is cleaned with deionized water, filtered and dried in vacuum. The gap of quasigraphite layer of the processed MWNTS is expanded, the electrochemical Li capacity is increased.

Description

technical field [0001] The invention belongs to the technical field of high-energy batteries. In particular, it relates to a method for improving the electrochemical lithium storage capacity of carbon nanotubes for preparing high-capacity carbon nanotube negative electrode materials suitable for various non-aqueous electrolyte lithium ion secondary batteries. Background technique [0002] Lithium secondary batteries, which are used as the main power supply of mobile communication equipment and portable electronic equipment, have become a research hotspot at home and abroad due to their excellent performance such as high output voltage and high energy density. However, in a lithium secondary battery using lithium metal as the negative electrode material, dendrites are precipitated on the negative electrode during charging. As a result of repeated charge and discharge, the dendrites will break through the separator and reach the positive electrode, causing a short circuit insi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04
CPCY02E60/12Y02E60/10
Inventor 林克芝王晓琳
Owner TSINGHUA UNIV
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