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Application of chestnut-shaped graded manganese selenide/carbon composite material as lithium ion battery anode material

A technology of carbon composite materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation methods and processes of manganese selenide, difficulty in preparing single-phase manganese selenide, and difficulty in large-scale production, etc. problem, to achieve the effect of promoting fast ion transmission, shortening ion diffusion path, and environmental protection yield

Inactive Publication Date: 2019-10-22
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manganese selenide is more complicated in preparation method and preparation process, and it is difficult to produce on a large scale.
The traditional solid-phase method is difficult to prepare single-phase manganese selenide, and the reaction pulse laser deposition method or thermal injection method usually requires strict high-temperature synthesis conditions and complex preparation processes
These limit the development of manganese selenide as a lithium ion anode material to a certain extent.
[0004] In addition, manganese selenide will produce a certain volume effect during the cycle, which will easily cause electrode pulverization and lead to electronic connection failure, so it will experience rapid capacity decay under long cycle conditions.

Method used

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  • Application of chestnut-shaped graded manganese selenide/carbon composite material as lithium ion battery anode material
  • Application of chestnut-shaped graded manganese selenide/carbon composite material as lithium ion battery anode material
  • Application of chestnut-shaped graded manganese selenide/carbon composite material as lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 10mmol manganese acetate dihydrate (Aladdin reagent, chemically pure) and 3.25g polyvinylpyrrolidone dissolved in 75mL absolute ethanol / deionized water (volume ratio 1:1), take 13.4mmol trimesic acid (Aladdin Reagents, chemically pure) and 3.25g polyvinylpyrrolidone were dissolved in 75mL absolute ethanol / deionized water (volume ratio 1:1), and the two were continuously stirred until completely dissolved. The trimesic acid / polyvinylpyrrolidone solution was slowly added dropwise to the manganese acetate / polyvinylpyrrolidone solution at 1ml / min with constant stirring. A white suspension was observed gradually in the solution. After the dropwise addition is completed, stir at room temperature for 20 min. The resulting suspension was allowed to stand at room temperature for 6 hours, washed with ethanol and deionized water for three times, and then put into an oven and kept at 60°C for 12 hours to obtain a manganese-based metal organic framework.

[0041] Take 100mg of t...

Embodiment 2

[0047] Dissolve 20mmol manganese acetate dihydrate (Aladdin reagent, chemically pure) and 7.5g polyvinylpyrrolidone in 75mL absolute ethanol / deionized water (volume ratio 1:1), take 13.4mmol trimesic acid (Aladdin) Reagent, chemically pure) and 7.5g polyvinylpyrrolidone were dissolved in 75mL absolute ethanol / deionized water (volume ratio 1:1), and the two were continuously stirred until completely dissolved. The trimesic acid / polyvinylpyrrolidone solution was slowly added dropwise to the manganese acetate / polyvinylpyrrolidone solution at 0.5ml / min with constant stirring. A white suspension was observed gradually in the solution. After the dropwise addition is completed, stir at room temperature for 20 min. The resulting suspension was allowed to stand at room temperature for 24 hours, washed with ethanol and deionized water three times, and then put into an oven, and kept at 60° C. for 12 hours to obtain a manganese-based metal organic framework.

[0048] Take 100mg of the obt...

Embodiment 3

[0051] Dissolve 20mmol of anhydrous manganese acetate or manganese acetate dihydrate (Aladdin's reagent, chemically pure) and 15g of polyvinylpyrrolidone in 150mL of water, and take 26.8mmol of trimesic acid (Aladdin's reagent, chemically pure) in 150mL of anhydrous In ethanol, the two were continuously stirred until completely dissolved. The trimesic acid solution was slowly added dropwise to the manganese acetate / polyvinylpyrrolidone solution at 1ml / min with constant stirring. A white suspension was observed gradually in the solution. After the dropwise addition is completed, stir at room temperature for 20 min. The resulting suspension was allowed to stand at room temperature for 24 hours, washed with ethanol and deionized water three times, and then put into an oven, and kept at 60° C. for 12 hours to obtain a manganese-based metal organic framework.

[0052] Take 200mg of the manganese-based metal organic frame and 1g of selenium powder and put them in two high-temperature...

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Abstract

The invention discloses application of a chestnut-shaped graded manganese selenide / carbon composite material as a lithium ion battery anode material. The diameter of the chestnut-shaped graded manganese selenide / carbon composite material is about 1-5 [mu]m. The chestnut-shaped graded manganese selenide / carbon composite material has the multiple characteristics of the high conductivity, the high specific surface area, the high volume change inhibition effect, the relatively higher working voltage platform and the pseudo-capacitance enhancement, so that the safety of the lithium ion battery is improved, the cycling stability and the rate capability of the lithium ion battery are improved, and the assembled lithium ion battery has the better electrochemical performance.

Description

Technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to the application of a chestnut-shaped graded manganese selenide / carbon composite material as a lithium ion battery negative electrode material and a preparation method. Background technique [0002] Due to its long cycle life, high energy density, low self-discharge characteristics, safe working voltage and no memory effect, lithium ion batteries (LIB) have been widely used in our modern lives such as portable electronic devices. However, the current LIB is not enough to meet the growing demand for large-scale applications including electric vehicles, hybrid vehicles and emerging smart grids. Among them, energy density and cycle life, as the most important features of LIB, must be upgraded and improved. As a widely used negative electrode material in lithium-ion batteries, graphite has a limited theoretical capacity (~372mAh g-1) and poor rate performance, making it difficult to mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/581H01M4/625H01M10/0525Y02E60/10
Inventor 杨涛杨得鑫钟家松陈逸凡鲍亮李心悦朱怡雯陆潇晓熊琴琴
Owner HANGZHOU DIANZI UNIV
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