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Preparation method of lithium battery negative electrode material with litchi-shaped sodium tungstate/nitrogen-doped carbon composite structure

A nitrogen-doped carbon and composite structure technology, applied in battery electrodes, negative electrodes, structural parts, etc., can solve the problems of complex synthesis and treatment process, harsh reaction conditions, unfavorable green production, etc., and achieve the effect of excellent cycle life

Active Publication Date: 2022-04-19
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the Southwest University team synthesized litchi-like FeS in a hydrothermal environment 2 @FeSe 2 Microspheres, and apply them in sodium-ion batteries, the synthesis of this lychee-like microspheres needs to introduce highly toxic and corrosive hydrazine hydrate as a reducing agent, the reaction conditions are relatively harsh, and it is not conducive to green production (DOI :10.1039 / C7TA05931K)
The lychee-shaped Si@C microspheres obtained by the Zhejiang University team were also synthesized under the alkaline conditions provided by ammonia water, and after the synthesis, strong corrosive reagents such as hydrochloric acid and hydrofluoric acid were used for cleaning, synthesis and treatment Complex process (DOI: 10.1007 / s11581-019-03108-z)

Method used

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  • Preparation method of lithium battery negative electrode material with litchi-shaped sodium tungstate/nitrogen-doped carbon composite structure
  • Preparation method of lithium battery negative electrode material with litchi-shaped sodium tungstate/nitrogen-doped carbon composite structure
  • Preparation method of lithium battery negative electrode material with litchi-shaped sodium tungstate/nitrogen-doped carbon composite structure

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of a litchi-shaped sodium tungstate / nitrogen-doped carbon composite structure lithium battery negative electrode material, comprising the following steps:

[0036] (1) Material preparation: take sodium carboxymethyl cellulose with an average molecular weight of 90,000 and dissolve it in 29mL of water, then add ammonium metatungstate for dissolution to obtain a dispersion containing tungstate and CMC; take dopamine and dissolve it in In ionized water, a dopamine solution is formed;

[0037] (2) Hydrothermal reaction: Take the dopamine solution and add it to the dispersion containing ammonium metatungstate and CMC. At this time, the concentration of sodium carboxymethylcellulose in the solution is 15g / L, and the concentration of ammonium metatungstate is 30mmol / L , the concentration of dopamine is 30mmol / L, and the mixed reaction solution is prepared. After stirring evenly, it is placed in an oven for hydrothermal reaction at 180°C for 6 hours. After ...

Embodiment 2-6

[0047] Example 2-6 On the basis of Example 1, the influence of different hydrothermal reaction conditions on the electrochemical performance of the lithium battery negative electrode material of litchi-shaped micron sodium tungstate / nitrogen-doped carbon composite structure was studied (using the same method as in Example 1). 1 same test method), the results are as follows:

[0048]

[0049]

[0050] It can be seen from the above table: when the hydrothermal reaction temperature is insufficient, it is difficult to form lychee-like micron-sized sodium tungstate, thereby reducing the electrochemical performance; and when the hydrothermal reaction temperature is too high, although the electrochemical performance will be improved decreased, but the impact is not significant, but considering the energy consumption problem, it is not appropriate to choose an excessively high reaction temperature.

Embodiment 7-11

[0052] Examples 7-11 On the basis of Example 1, the influence of different calcination conditions on the electrochemical performance of the lithium battery negative electrode material of litchi-shaped micron sodium tungstate / nitrogen-doped carbon composite structure (using the same method as in Example 1) test method), the results are as follows:

[0053]

[0054] It can be seen from the above table that when the calcination temperature is lower than 300 °C, the crystallinity of the crystal may decrease due to insufficient temperature, which will affect the morphology of the composite structure and reduce the electrochemical performance; and when the temperature is too high, it may lead to composite The local collapse of the structure occurs, which seriously degrades the electrochemical performance.

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Abstract

The invention belongs to the technical field of lithium batteries, and in particular relates to a preparation method of a lithium battery negative electrode material with a lychee-shaped sodium tungstate / nitrogen-doped carbon composite structure, which uses CMC, soluble tungstate and dopamine as raw materials for hydrothermal treatment, and then passes through Prepared by calcination, the litchi-shaped sodium tungstate / nitrogen-doped carbon composite structure lithium battery negative electrode material of the present invention has excellent cycle life, rate performance and conductivity.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a preparation method of a lithium battery negative electrode material with a litchi-shaped sodium tungstate / nitrogen-doped carbon composite structure. Background technique [0002] In recent decades, lithium-ion batteries with high energy density and long cycle life have received continuous attention, and lithium-ion batteries with high power density and high energy density will be widely used. However, the theoretical capacity of commercial graphite-based lithium-ion batteries is low (372mAh / g), so materials with higher lithium storage mechanisms should be developed. In recent years, tungsten-based lithium battery anode materials are attracting more and more attention, mainly because tungsten-based anode materials have significant advantages in theoretical capacity, high-rate discharge, and charge-discharge volume change. In the patent CN110327913A, under ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 史家远杨清华徐旭升刘富亮陈晓涛石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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