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Preparation method of lithium ion battery negative electrode spherical V2O3/C composite material with multilevel structure

A technology for lithium ion batteries and composite materials, which is applied in the field of preparation of negative electrode materials for lithium ion batteries, can solve the problems of low coulombic efficiency of first charge and discharge, poor charge and discharge cycle stability, etc., and achieves excellent electrochemical performance, uniform morphology, excellent Effects of Cyclic Stability

Active Publication Date: 2014-02-05
HEILONGJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes an improved type for making batteries that have good electrical properties such as fast charging times or long lifetimes without losing their effectiveness due to swelling caused when they are charged up too quickly (their ability to absorb more energy).

Problems solved by technology

Layered structures are commonly found among different types of carbon materials that form complexes called composites (also known as hierarchically structured substances). These layers help improve their properties like conductivity, durability, thermal shock resistance, etc., making them useful in various applications including electronic components, sensors, fuel cells, solar panels, biomedics, power tools, electronics, automobiles, space exploration technologies, military equipment, nuclear reactants, and others.

Method used

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  • Preparation method of lithium ion battery negative electrode spherical V2O3/C composite material with multilevel structure
  • Preparation method of lithium ion battery negative electrode spherical V2O3/C composite material with multilevel structure
  • Preparation method of lithium ion battery negative electrode spherical V2O3/C composite material with multilevel structure

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specific Embodiment approach 1

[0021] Specific Embodiment 1: This embodiment has a lithium-ion battery negative electrode spherical V with multi-level structure 2 o 3 The preparation method of / C composite material is realized according to the following steps:

[0022] 1. Add 1-3g of vanadyl acetylacetonate and 4-6g of glucose into 300ml of absolute ethanol, and stir magnetically for 30min to obtain a mixed solution;

[0023] 2. Add a hydrogen peroxide solution with a mass concentration of 30% to the mixed solution obtained in step 1 until the pH value of the solution is 2 to 6, then transfer it to a reaction kettle, and react at 120 to 240°C for 2 to 48 hours. The product was washed by centrifugation with anhydrous methanol for 2-5 times, and then vacuum-dried at 60-80°C for 12 hours to obtain a carbon-coated vanadium oxide precursor;

[0024] 3. Sinter the carbon-coated vanadium oxide precursor in a nitrogen-hydrogen mixed atmosphere at a temperature of 400-800°C for 2-8 hours, and cool to room temperat...

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment is different from Embodiment 1 in that in step 1, 1.85 g of vanadyl acetylacetonate and 5 g of glucose are added to 300 ml of absolute ethanol. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment is different from Embodiment 1 in that in Step 1, 2 g of vanadyl acetylacetonate and 5.8 g of glucose are added to 300 ml of absolute ethanol. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a preparation method of a lithium ion battery negative electrode spherical V2O3/C composite material with multilevel structure and relates to a preparation method of a lithium ion battery negative electrode material, and the preparation method is used for solving the problem that first-time charging and discharging coulombic efficiency is low and the charging and discharging cyclic stability is poor as the existing V2O3 is used as the lithium ion battery negative electrode material. The method comprises the following steps: firstly, adding vanadyl acetylacetonate and glucose into absolute ethyl alcohol, and stirring to obtain mixed liquor; secondly, adding hydrogen peroxide liquor into the mixed liquor to adjust pH value, heating and reacting, cleaning and drying products to obtain a carbon-coated vanadium oxide precursor thirdly, sintering and cooling the carbon-coated vanadium oxide precursor to the room temperature. According to the invention, the material used as a lithium ion battery negative electrode has higher first-time charging and discharging coulombic efficiency and excellent cyclic stability; the first-time charging and discharging capacity of the material reaches 1000 mAh/g, the first-time charging and discharging coulombic efficiency is 72.4%, and 50-time cyclic capacity is kept over 700 mAh/g.

Description

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Claims

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Application Information

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Owner HEILONGJIANG UNIV
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