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Hydrothermal method for preparing SnSe2/CNTs composite lithium ion battery electrode material

A lithium-ion battery, electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as large volume expansion, improve performance and life, improve discharge specific capacitance and cycle stability, and simple operation. Effect

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

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Problems solved by technology

The main purpose of the patent of the present invention is to effectively solve the problem of SnSe by doping carbon nanotubes. 2 As an electrode material for lithium-ion batteries, there is a problem of large volume expansion during lithium intercalation and desorption reactions. The large interlayer spacing of carbon nanotubes makes it easier to intercalate and deintercalate lithium ions. Collapse, can greatly improve the performance and life of lithium-ion batteries

Method used

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  • Hydrothermal method for preparing SnSe2/CNTs composite lithium ion battery electrode material
  • Hydrothermal method for preparing SnSe2/CNTs composite lithium ion battery electrode material
  • Hydrothermal method for preparing SnSe2/CNTs composite lithium ion battery electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[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 : CNTs=10:1) Weigh a certain amount of carbon nanotubes and put them into the liner 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

[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 : CNTs=10:1) Weigh a certain amount of carbon nanotubes and put them into the liner 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

[0038] 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 : CNTs=10:1) Weigh a certain amount of carbon nanotubes and put them into the liner 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.

[0039] The chemical raw material SnCl used in the above examples 2 , SeO 2 And th...

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Abstract

The invention discloses a hydrothermal method for preparing a SnSe2 / carbon nanotube composite lithium ion battery electrode material, comprising the steps of: weighing a certain amount of SnCl2 and SeO2; placing the SnCl2 and SeO2 in the liner of a hydrothermal reaction vessel; weighing and placing a carbon nanotube in the liner; adding deionized water to the liner, and sealing the liner in the reaction vessel after magnetic stirring; placing the reaction vessel in a drying oven for a hydrothermal reaction; after the reaction is completed, centrifugally washing a reaction product with deionized water and absolute ethyl alcohol a plurality times, and then drying the reaction product. The method is easy to operate and does not require complicated equipment. The synthesized nano-scale SnSe2 / CNTs 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 803.7mAh g-1, 521.3mAh g-1, and 454.7mAh g-1 respectively, and the specific discharge capacity remains at210.3mAh g-1 after 100 cycles. In addition, the charge-discharge capacity can still maintain at 176.5mAh g-1 at a high current density of 0.5 C.

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 lithium-ion batteries with tin oxide-doped carbon materials 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...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/0525H01M4/583H01M4/62C01B32/158
CPCC01B32/158H01M4/362H01M4/38H01M4/387H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 吕建国陈鸿文
Owner ZHEJIANG UNIV
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