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ZnS/SnS-coated NC hollow microsphere negative electrode material for lithium ion/sodium ion battery negative electrode and preparation method of ZnS/SnS-coated NC hollow microsphere negative electrode material

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of first-time coulombic efficiency and capacity retention rate after cycle are not very good, commercial application value needs to be improved, etc., to achieve Effects of improving cycle stability and rate performance, buffering volume expansion, and shortening transmission path

Active Publication Date: 2020-09-25
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the precursor used to prepare ZnS / SnS nanoparticle composites is ZnSn(OH) 6 Cubic block, the specific surface area is smaller than spherical structure, not the best shape structure, its first coulombic efficiency and capacity retention rate after cycle are not very good, the commercial application value needs to be improved

Method used

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  • ZnS/SnS-coated NC hollow microsphere negative electrode material for lithium ion/sodium ion battery negative electrode and preparation method of ZnS/SnS-coated NC hollow microsphere negative electrode material
  • ZnS/SnS-coated NC hollow microsphere negative electrode material for lithium ion/sodium ion battery negative electrode and preparation method of ZnS/SnS-coated NC hollow microsphere negative electrode material
  • ZnS/SnS-coated NC hollow microsphere negative electrode material for lithium ion/sodium ion battery negative electrode and preparation method of ZnS/SnS-coated NC hollow microsphere negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of ZnS / SnS@NC hollow microsphere negative electrode material for lithium ion / sodium ion battery negative electrode includes the following steps:

[0032] (1) Take 0.284g NaSnO 3 ·2H 2 O was dissolved in 10ml deionized water, and sodium alginate aqueous solution was added as solution A, so that the concentration of sodium alginate in solution A was 0.8g / L, and 0.251g (CH 3 COO) 2 Zn·2H 2 O was dissolved in 2ml of deionized water, and an excess of 25% concentrated ammonia was added as liquid B. The ammonia molecules in the concentrated ammonia and (CH 3 COO) 2 Zn·2H 2 Zn in O 2+ The molar ratio is 4.1:1, which is conducive to the formation of Zn(NH 3 ) 4 2+ ; Mix A and B liquids together and put them in an autoclave, keep it at 150℃ for 6h to obtain ZnSn(OH) 6 ;

[0033] (2) Weigh 0.2g of ZnSn(OH) obtained in step (1) 6 Dissolve 10 mg of sodium lauryl sulfate in 60 ml of deionized water, sonicate for 0.3 hours, and then stir for 0.5 hours to obtain mixed sol...

Embodiment 2

[0040] A preparation method of ZnS / SnS@NC hollow microsphere negative electrode material for lithium ion / sodium ion battery negative electrode includes the following steps:

[0041] (1) Take 0.284g NaSnO 3 ·2H 2 O was dissolved in 10ml of deionized water, and sodium alginate aqueous solution was added as solution A, so that the concentration of sodium alginate in solution A was 1.0g / L, and 0.276g (CH 3 COO) 2 Zn·2H 2 O was dissolved in 2ml of deionized water, and an excess of 25% concentrated ammonia was added as liquid B. The ammonia molecules in the concentrated ammonia and (CH 3 COO) 2 Zn·2H 2 Zn in O 2+ The molar ratio is 4.2:1, which is conducive to the formation of Zn(NH 3 ) 4 2+ ; Mix A and B liquids together and put them in an autoclave, keep them at 155℃ for 5.5h to obtain ZnSn(OH) 6 ;

[0042] (2) Weigh 0.2g of ZnSn(OH) obtained in step (1) 6 Dissolve 10mg sodium lauryl sulfate in 60ml deionized water, sonicate for 0.4 hours, and then stir for 1 hour to obtain mixed solutio...

Embodiment 3

[0048] A preparation method of ZnS / SnS@NC hollow microsphere negative electrode material for lithium ion / sodium ion battery negative electrode includes the following steps:

[0049] (1) Take 0.284g NaSnO 3 ·2H 2 O was dissolved in 10ml of deionized water, and sodium alginate aqueous solution was added as solution A, so that the concentration of sodium alginate in solution A was 1.1g / L, and 0.428g (CH 3 COO) 2 Zn·2H 2 O was dissolved in 2ml of deionized water, and an excess of 25% concentrated ammonia was added as liquid B. The ammonia molecules in the concentrated ammonia and (CH 3 COO) 2 Zn·2H 2 Zn in O 2+ The molar ratio is 5:1, which is conducive to the formation of Zn(NH 3 ) 4 2+ ; Mix A and B liquids together and put them in an autoclave, keep it at 160℃ for 5h to obtain ZnSn(OH) 6 ;

[0050] (2) Weigh 0.3g of ZnSn(OH) obtained in step (1) 6 Dissolve 10mg sodium lauryl sulfate in 60ml deionized water, sonicate for 0.5 hours, and then stir for 2 hours to obtain mixed solution C; ...

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Abstract

The invention provides a ZnS / SnS-coated NC hollow microsphere negative electrode material for a lithium ion / sodium ion battery negative electrode and a preparation method of the ZnS / SnS-coated NC hollow microsphere negative electrode material, and belongs to the technical field of lithium / sodium batteries. The method comprises the following steps that: spherical ZnSn(OH)6 is prepared; a simple hydrothermal method and an in-situ polymerization coating method are combined to prepare the ZnS / SnS-coated NC hollow microsphere composite material with the ZnSn(OH)6 is used as a precursor, and a pyrrole monomer used as a carbon source. The microstructure of the composite material is of a hollow core-shell structure; the surface of the composite material is covered with a smooth carbon layer; the hollow structure can adapt to volume expansion of ZnS / SnS in a lithium ion / sodium ion de-intercalation process; and the carbon layer on the surface of the composite material can improve the conductivity, prevent agglomeration of ZnS / SnS and guarantee the structural stability of the composite material. The lithium ion / sodium ion battery negative electrode prepared from the ZnS / SnS-coated NC hollow microsphere material shows relatively high specific capacity, excellent rate capability and cycle performance.

Description

【Technical Field】 [0001] The invention relates to the technical field of lithium / sodium batteries, in particular to a ZnS / SnS@NC hollow microsphere negative electrode material for lithium ion / sodium ion battery negative electrodes and a preparation method thereof. 【Background technique】 [0002] Lithium metal has the smallest density of all metals in nature (density is 0.534g / cm 3 ) Metal, and has a very low standard reduction potential (-3.04V), is the most negative potential of the metal elements, lithium also has a higher theoretical capacity (3860mAh / g). However, because lithium metal is used as the negative electrode, lithium dendrites will be formed during the charging and discharging process of the battery, which will cause the battery to short circuit and eventually cause the battery to burn or even explode. Therefore, the lithium battery generally refers to the lithium ion battery. Lithium-ion batteries are widely used in batteries in mobile phones, notebook computers an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525H01M10/054
CPCH01M4/366H01M4/5815H01M4/583H01M4/625H01M10/0525H01M10/054H01M2004/027Y02E60/10
Inventor 潘齐常张丽轩郑锋华王红强李庆余
Owner GUANGXI NORMAL UNIV
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