Preparation method for SiLiMn2O4CNT composite positive electrode material of lithium ion battery

A composite positive electrode material and lithium-ion battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of being unable to adapt to the extensive demand for miniaturization, development, large-capacity, and high-power chemical power supplies, and achieve good discharge capacity and capacity retention The effect of high rate and high charge and discharge efficiency

Inactive Publication Date: 2020-01-03
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can no longer adapt to the miniaturization development of various portable electronic devices and the extensive demand of electric vehicles for large-capacity and high-power chemical power supplies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1.5g of spherical nano-silicon with a particle size of 20 microns and 2.5g of lithium manganate powder with a particle size of 1.5 microns were ultrasonically dispersed in an aqueous solution for 6 hours, and then transferred to a ball mill tank for wet grinding at a speed of 500 rpm. Ball milled for 6 hours to achieve the purpose of evenly coating nano-silicon with acid embedding. Separately prepare carbon nanotubes, and fully ultrasonically disperse them in aqueous solution for 20 minutes. The ball-milled slurry was added to the carbon nanotube solution, and then stirred at a high speed for 1 hour. After spray drying, the inlet temperature is 250°C and the outlet temperature is 90°C to form a lithium-ion battery Si / LiMn 2 o 4 / CNT composite cathode material.

[0024] Battery production and electrochemical performance testing are as follows: Si / LiMn 2 o 4 / CNT composite cathode material, acetylene black and polyvinylidene fluoride in a mass ratio of 70:15:15, Si / L...

Embodiment 2

[0026] 1.8 g of spherical nano-silicon with a particle size of 15 μm and 2 g of lithium manganese oxide powder with a particle size of 1.0 μm were ultrasonically dispersed in an aqueous solution for 5 hours, and then transferred to a ball mill tank for wet grinding at a speed of 400 rpm. Hours to achieve the purpose of evenly coating nano-silicon with acid. Separately prepare carbon nanotubes, and fully ultrasonically disperse them in aqueous solution for 30 minutes. Add the ball-milled slurry into the carbon nanotube solution, and then perform high-speed stirring for 2 hours. After spray drying, the inlet temperature is 270°C and the outlet temperature is 95°C to form a lithium-ion battery Si / LiMn 2 o 4 / CNT composite cathode material.

[0027] Electrode preparation and performance testing are the same as in Example 1. After testing, the first discharge capacity is 883mAh / g, the charge and discharge efficiency is 88.3%, and the capacity retention rate after 20 cycles is 9...

Embodiment 3

[0029] 2.0g of spherical nano-silicon with a particle size of 13μm and 1.8g of lithium manganate powder with a particle size of 0.8μm were ultrasonically dispersed in an aqueous solution for 3 hours, and then transferred to a ball mill tank for wet grinding at a speed of 350 rpm. 3 hours to achieve the purpose of evenly coating nano-silicon by acid embedding. Separately prepare carbon nanotubes, and fully ultrasonically disperse them in aqueous solution for 40 minutes. Add the ball-milled slurry into the carbon nanotube solution, and then perform high-speed stirring for 1.5 hours. After spray drying, the inlet temperature is 285°C and the outlet temperature is 100°C to form a lithium-ion battery Si / LiMn 2 o 4 / CNT composite cathode material.

[0030] Electrode preparation and performance testing are the same as in Example 1. After testing, the first discharge capacity is 896mAh / g, the charge and discharge efficiency is 84.6%, and the capacity retention rate after 20 cycles...

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Abstract

The invention relates to the field of lithium batteries, and discloses a preparation method for a SiLiMn2O4CNT composite positive electrode material of a lithium ion battery. The composite positive electrode material of the lithium ion battery comprises composite particles formed by coating nano silicon with lithium manganate and carbon nanotubes compounded on the surfaces of the composite particles. The preparation method comprises the following steps of: 1) dispersing nano silicon and lithium manganate in a solvent, and carrying out ball milling and wet mixing to coat the nano silicon with the lithium manganite, 2) dispersing carbon nanotubes in the solvent, and 3) mixing the slurry obtained in the step 1) with the slurry obtained in the step 2), and carrying out spray drying to obtain the composite positive electrode material. The composite positive electrode material is prepared into a battery, the initial discharge capacity is good, the charge-discharge efficiency is high, and thecapacity retention rate is high after multiple cycles.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to lithium ion batteries SiLiMn 2 o 4 The invention discloses a preparation method of a CNT composite cathode material. Background technique [0002] Lithium manganese oxide is mainly spinel lithium manganate spinel lithium manganate LiMn 2 o 4 It is the cathode material with three-dimensional lithium ion channels that Hunter first produced in 1981. It has been greatly concerned by many scholars and researchers at home and abroad. As an electrode material, it has low price, high potential, environmental friendliness, and high safety performance. Advantages, is the most promising replacement for lithium cobalt oxide LiCoO 2 Become the cathode material of a new generation of lithium-ion batteries. [0003] Lithium manganese oxide is one of the more promising lithium ion cathode materials. Compared with traditional cathode materials such as lithium cobalt oxide, lithium manganate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/505H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 万军民韩益辉陈斌杰周艳彭志勤王秉
Owner ZHEJIANG SCI-TECH UNIV
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