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Hydrothermal method for preparing Cu-doped SnSe2 lithium ion battery electrode material

A lithium-ion battery and electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of easy cracking and pulverization of electrode materials, loss of electrical contact of active materials, deterioration of electrochemical performance, etc., and achieve excellent electrochemical performance. Performance, low cost, and the effect of improving discharge specific capacitance and cycle stability

Inactive Publication Date: 2019-08-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SnSe 2 As an important member of tin-based materials, there are also the following problems: SnSe 2 A large volume expansion will still occur during the lithium intercalation and desorption reaction. As an electrode material, it is easy to crack and pulverize, and the internal electrical contact of the active material is lost, resulting in SnSe 2 Electrochemical performance deterioration
[0004] Preparation of Cu-doped SnSe 2 Composite material, can effectively solve the SnSe 2 As an electrode material for lithium-ion batteries, there will still be a large volume expansion problem and poor conductivity during the lithium intercalation and desorption reaction.

Method used

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  • Hydrothermal method for preparing Cu-doped SnSe2 lithium ion battery electrode material
  • Hydrothermal method for preparing Cu-doped SnSe2 lithium ion battery electrode material
  • Hydrothermal method for preparing Cu-doped SnSe2 lithium ion battery electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] According to the molar ratio (Sn:Se=1:2), weigh a certain amount of SnCl 2 and SeO 2 , put the two reaction materials into the liner of a 50 ml hydrothermal reaction kettle, and clean the liner with deionized water and absolute ethanol in advance. According to a certain mass ratio (SnCl 2 : Cu(NO 3 ) 2=5:1) Weigh a certain amount of copper nitrate solid particles and put them into the inner tank as well. Add a certain amount of deionized water to the inner tank to ensure that the filling volume is 80%, and then carry out magnetic stirring for 30 minutes, then put the inner tank into the reaction kettle and seal it. The reactor was placed in a constant temperature drying oven at 180 °C for 24 h and then cooled to room temperature naturally. The obtained product was washed with deionized water and absolute ethanol alternately for three times, and then dried in an incubator at 80 °C for 12 h.

Embodiment 2

[0034] According to the molar ratio (Sn:Se=1:2), weigh a certain amount of SnCl 2 and SeO 2 , put the two reaction materials into the liner of a 50 ml hydrothermal reaction kettle, and clean the liner with deionized water and absolute ethanol in advance. According to a certain mass ratio (SnCl 2 : Cu(NO 3 ) 2 =5:1) Weigh a certain amount of copper nitrate solid particles and put them into the inner tank as well. Add a certain amount of deionized water to the inner tank to ensure that the filling volume is 80%, and then carry out magnetic stirring for 30 minutes, then put the inner tank into the reaction kettle and seal it. The reactor was placed in a constant temperature drying oven at 160 °C for 24 h and then cooled to room temperature naturally. The obtained product was washed with deionized water and absolute ethanol alternately for three times, and then dried in an incubator at 80 °C for 12 h.

Embodiment 3

[0036] According to the molar ratio (Sn:Se=1:2), weigh a certain amount of SnCl 2 and SeO 2 , put the two reaction materials into the liner of a 50 ml hydrothermal reaction kettle, and clean the liner with deionized water and absolute ethanol in advance. According to a certain mass ratio (SnCl 2 : Cu(NO 3 ) 2 =5:1) Weigh a certain amount of copper nitrate solid particles and put them into the inner tank as well. Add a certain amount of deionized water to the inner tank to ensure that the filling volume is 80%, and then carry out magnetic stirring for 30 minutes, then put the inner tank into the reaction kettle and seal it. The reactor was placed in a constant temperature drying oven at 200 °C for 24 h and then cooled to room temperature naturally. The obtained product was washed with deionized water and absolute ethanol by alternating centrifugation for three times, and then dried in an incubator at 80°C for 12 h.

[0037] The chemical raw material SnCl used in the above...

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Abstract

The invention discloses a hydrothermal method for preparing a Cu-doped SnSe2 lithium ion battery electrode material, comprising the steps of: weighing SnCl2 and SeO2; placing the SnCl2 and SeO2 in theliner of a hydrothermal reaction vessel; weighing and placing copper nitrate solid particles in the liner; adding deionized water to the liner, and sealing the liner in the reaction vessel after magnetic stirring; placing the liner in a drying oven for a hydrothermal reaction; after the reaction is completed, centrifugally washing a reaction product with deionized water and absolute ethyl alcohola plurality times, and then drying the reaction product. The method is easy to operate and does not require complicated equipment. The synthesized Cu-doped SnSe2 composite material, as a negative electrode material, is used in a lithium ion battery system to be subjected to an electrochemical performance test. In an electrochemical test with a current density of 0.1C, the specific discharge capacities in the first three charge-discharge cycles are 433.1mAh g-1, 415.4mAh g-1, 395.9mAh g-1 respectively,, and the specific discharge capacity remains at 152mAh g-1 after 100 cycles.

Description

technical field [0001] The invention relates to the preparation of electrode materials for lithium-ion batteries, in particular to the field of electrode materials for tin-doped copper-ion lithium-ion batteries with microscopic and nanostructures. Background technique [0002] The development of clean and renewable energy is a major strategy for my country's social and economic development. In all levels of new energy technology, electrochemical energy storage plays an extremely important role, and it is also a hot issue in current scientific research. Lithium-ion batteries have become the most widely used secondary batteries in the world today because of their high energy density, long cycle life, and no memory effect. As an important factor to improve the energy and cycle life of lithium-ion batteries, anode materials for lithium-ion batteries have naturally become the focus of people's research. In recent years, with the continuous deepening of research on nano-alloy ma...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/36H01M10/0525
CPCH01M4/362H01M4/38H01M4/387H01M10/0525Y02E60/10
Inventor 吕建国陈鸿文
Owner ZHEJIANG UNIV
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