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A kind of zns/sns@nc hollow microsphere negative electrode material for lithium ion/sodium ion battery negative electrode and preparation method thereof

A technology for sodium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as the need to improve the commercial application value, the first coulomb efficiency and the capacity retention rate after the cycle is not very good, etc. Suitable for mass production, improved electronic conductivity, high yield

Active Publication Date: 2022-06-21
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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  • A kind of zns/sns@nc hollow microsphere negative electrode material for lithium ion/sodium ion battery negative electrode and preparation method thereof
  • A kind of zns/sns@nc hollow microsphere negative electrode material for lithium ion/sodium ion battery negative electrode and preparation method thereof
  • A kind of zns/sns@nc hollow microsphere negative electrode material for lithium ion/sodium ion battery negative electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
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, comprising the following steps:

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

[0033] (2) Weigh 0.2 g of ZnSn(OH) obtained in step (1) 6 and 10 mg of sodium dodecyl sulfate dissolved in 60 ml of deio...

Embodiment 2

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

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

[0042] (2) Weigh 0.2 g of ZnSn(OH) obtained in step (1) 6 and 10 mg of sodium dodecyl sulfate dissolved in 60 ml of deioni...

Embodiment 3

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

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

[0050] (2) Weigh 0.3 g of ZnSn(OH) obtained in step (1) 6 and 10 mg of sodium dodecyl sulfate dissolved in 60 ml of deionize...

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Abstract

The invention provides a ZnS / SnS@NC hollow microsphere negative electrode material for lithium-ion / sodium-ion battery negative electrodes and a preparation method thereof, belonging to the technical field of lithium / sodium batteries. The method of the present invention comprises the following steps: preparing spherical ZnSn(OH) 6 ; With ZnSn(OH) 6 ZnS / SnS@NC hollow microsphere composites were prepared by combining simple hydrothermal method and in-situ polymerization coating method. The microscopic morphology of the composite material is a hollow core-shell structure, and the surface is covered with a smooth carbon layer. The hollow structure can adapt to the volume expansion of ZnS / SnS in the process of deintercalating lithium ions / sodium ions. It can improve the conductivity, prevent the agglomeration of ZnS / SnS, and ensure the stability of its structure. Li-ion / Na-ion battery anodes made of ZnS / SnS@NC hollow microsphere materials exhibit high specific capacity, excellent rate performance 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 negative electrodes of lithium ion / sodium ion batteries and a preparation method thereof. 【Background technique】 [0002] Lithium metal has the smallest density among all metals in nature (density is 0.534g / cm 3 ) metal, and has a very low standard reduction potential (-3.04V), which is the most negative potential among metal elements, and lithium also has a high theoretical capacity (3860mAh / g). However, since lithium metal is used as the negative electrode, lithium dendrites will be formed during the charging and discharging process of the battery, resulting in a short circuit of the battery, which may eventually cause the battery to burn or even explode. Lithium-ion batteries are widely used as batteries in electronic products such as mobile phones and notebook computers. [0003] Lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Patents(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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