Carbon coated SnS2 composite material as well as preparation method and application thereof

A composite material, carbon-coated technology, applied in nanotechnology, electrical components, electrochemical generators for materials and surface science, etc., can solve problems such as uncontrollable buffer space, falling off electrode sheets, affecting battery cycle performance, etc. Achieve the effect of speeding up ion conduction, improving rate performance, and reducing transmission distance

Inactive Publication Date: 2018-08-10
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(RSC Advanced, 2016, 6, 35197–35202) SnS with this structure 2 The composite material can provide a certain buffer space for the volume change of sodium intercalation / desodium removal, but the buffer space is uncontrollable. In the long-term cycle, the composite material will fall off the electrode sheet due to the volume change, which will affect the cycle performance of the battery.

Method used

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  • Carbon coated SnS2 composite material as well as preparation method and application thereof
  • Carbon coated SnS2 composite material as well as preparation method and application thereof
  • Carbon coated SnS2 composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Add silicon spheres with a diameter of about 400nm into the mixed solution of deionized water and ethanol, and disperse evenly by ultrasonic to obtain mixed solution A; add urea and K to mixed solution A 2 SnO 3 ·3H 2 O, ultrasonically disperse evenly to obtain mixed liquid B; wherein, the volume ratio of ethanol and water is 37.5ml: 12.5ml, silicon balls, urea and K 2 SnO 3 ·3H 2 The mass ratio of O is 360mg: 1.8g: 240mg;

[0025] 2) Transfer the mixed liquid B to a 100ml hydrothermal kettle, place it in a 170°C hydrothermal tank, keep it warm for 2 hours, cool it down to room temperature naturally, wash it with water and ethanol three times, then repeat the above operation once, filter, SnO was obtained after washing and drying 2 coated SiO 2 Ball composite (SiO 2 @SnO 2 );

[0026] 3) SiO 2 @SnO 2 Add 2M NaOH solution, place on a heating plate set at 60°C, stir at a constant temperature of 60°C for 12h, filter, wash, and dry to obtain hollow SnO 2 ball...

Embodiment 2

[0034] The difference between this embodiment and Example 1 is: the diameter of the silicon sphere used in step 1) is about 100 nm; in step 5) SnO 2 The mass ratio to thiourea is (0.99:1), and the temperature of the muffle furnace is 550°C.

Embodiment 3

[0036] The difference between this embodiment and Example 1 is: the diameter of the silicon sphere used in step 1) is about 1000 nm; in step 5) SnO 2 The mass ratio to thiourea is (0.1:1).

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Abstract

The invention belongs to the field of new energy sources, and particularly relates to a carbon coated SnS2 composite material as well as a preparation method and application thereof. The invention provides the carbon coated SnS2 composite material which has a hollow shell-core structure; the shell is a hollow carbon shell; the inside is SnS2 nanometer sheets; a space gap is reserved between the SnS2 and the hollow carbon shell. The material can be applied to lithium ion batteries or sodium ion batteries or potassium ion batteries when being used as a negative electrode material.

Description

technical field [0001] The invention belongs to the field of new energy, in particular to a carbon-wrapped SnS 2 Composite materials and their preparation methods and applications. Background technique [0002] In lithium-ion batteries, sodium-ion batteries, and potassium-ion batteries, layered CdI 2 SnS 2 It is often used as battery negative electrode material and shows potential application value. However, the low intrinsic conductivity and the huge volume change upon intercalation / deintercalation of Na ions lead to poor electrical storage performance. Constructing nanostructured SnS2 and compounding it with highly conductive carbon materials (carbon nanotubes, graphene, hard carbon, etc.) is an effective way to solve the above problems. [0003] Wang Jingjing et al prepared carbon-coated SnS by vacuum sintering 2 Composite material, the composite material is a core-shell structure, as the negative electrode material of sodium ion battery, at 50mA g -1 The capacity r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 官轮辉赵毅吴初新
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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