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Preparation method of a three-dimensional composite CO3O4-Si-C negative electrode material

A co3o4-si-c, negative electrode material technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve problems such as unfavorable lithium ion and electron transportation, affecting cycle performance, SEI film thickness, etc., to achieve excellent electrochemical performance, improved specific capacity, and beneficial effects of electrical conductivity

Inactive Publication Date: 2019-05-10
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vigorous volume expansion and contraction can cause it to crack, making it difficult to stabilize
This makes the Si surface re-exposed to the electrolyte to form SEI again, which eventually leads to a thicker and thicker SEI film during charge and discharge, which is not conducive to the transportation of lithium ions and electrons, and ultimately affects cycle performance.

Method used

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  • Preparation method of a three-dimensional composite CO3O4-Si-C negative electrode material
  • Preparation method of a three-dimensional composite CO3O4-Si-C negative electrode material
  • Preparation method of a three-dimensional composite CO3O4-Si-C negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First soak nickel foam in 30% concentrated nitric acid for 5 minutes to remove the oxide layer on the surface, and then add 1.46g of Co(NO 3 ) 2 6H 2 O, 0.37 g NH 4 F and 1.5g of CO(NH 2 ) 2 Dissolve in 50 ml of distilled water, and the entire addition process is performed under magnetic stirring. After stirring for 30 minutes, move the entire mixed solution into a polytetrafluoroethylene-lined autoclave, put the trimmed nickel foam into the tetrafluoroethylene, fill the reaction solution with 80%, and react at 120°C for 5 hours. After the reaction, wait for it to cool down to the room temperature range, then alternately wash three times with deionized water and ethanol to remove impurities, and then treat it in a drying oven at 80 °C for 12 h. Finally, high-temperature roasting at 450° C. for 3 h gave the desired product. The soluble silicon source was dissolved in the ionic liquid system, and the prepared Co 3 o 4 The nanoarray was used as the cathode, the Pt...

Embodiment 2

[0025]First soak nickel foam in 30% concentrated nitric acid for 5 minutes to remove the oxide layer on the surface, and then add 1.46g of Co(NO 3 ) 2 6H 2 O, 0.37 g NH 4 F and 1.5g of CO(NH 2 ) 2 Dissolve in 50 ml of distilled water, and the entire addition process is performed under magnetic stirring. After stirring for 30 minutes, move the entire mixed solution into a polytetrafluoroethylene-lined autoclave, put the trimmed nickel foam into the tetrafluoroethylene, and fill the reaction solution with 80%. Reaction 5h. After the reaction, wait for it to cool down to the room temperature range, then alternately wash three times with deionized water and ethanol to remove impurities, and then treat it in a drying oven at 80 °C for 12 h. Finally, high-temperature roasting at 450° C. for 3 h gave the desired product. The soluble silicon source was dissolved in the ionic liquid system, and the Co 3 o 4 The nanoarray was used as the cathode, the Pt mesh electrode was used...

Embodiment 3

[0027] First soak nickel foam in 30% concentrated nitric acid for 5 minutes to remove the oxide layer on the surface, and then add 1.46g of Co(NO 3 ) 2 6H 2 O, 0.37 g NH 4 F and 1.5g of CO(NH 2 ) 2 Dissolve in 50 ml of distilled water, and the entire addition process is performed under magnetic stirring. After stirring for 30 minutes, move the entire mixed solution into a polytetrafluoroethylene-lined autoclave, put the trimmed nickel foam into the tetrafluoroethylene, and fill the reaction solution with 80%. Reaction 5h. After the reaction, wait for it to cool down to the room temperature range, then alternately wash three times with deionized water and ethanol to remove impurities, and then treat it in a drying oven at 80 °C for 12 h. Finally, high-temperature roasting at 450° C. for 3 h gave the desired product. The soluble silicon source was dissolved in the ionic liquid system, and the Co 3 o 4 The nanoarray was used as the cathode, the Pt mesh electrode was use...

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Abstract

The invention discloses a preparation method of a three-dimensional composite Co<3>O<4>-Si-C negative electrode material. The method comprises the following steps of (1) pre-processing foamed nickel with an acid to be used as a conductive current collector; (2) transferring the foamed nickel which is processed by the acid to a reaction kettle loaded with a mixed aqueous solution of cobalt nitrate, urea and ammonium fluoride, heating the reaction kettle, performing heat preservation for a certain time, cooling to a room temperature, washing and drying a product, and performing high-temperature calcination to obtain a Co3O4 nanowire structured array; (3) dissolving a soluble silicon source in an ion liquid system, and performing voltage-constant or current-constant electrodeposition under a certain temperature by taking the product obtained in the step (2) as a negative electrode and an inertia electrode as a positive electrode, and washing the electrodeposition product with an organic substance to separate an ion liquid and obtain a silicon layer; and (4) performing C-spraying surface processing on the product prepared in the step (3).

Description

technical field [0001] The invention belongs to the field of battery technology, in particular to a three-dimensional composite Co 3 o 4 - A method for preparing a Si-C negative electrode material, in particular to a method in which an ionic liquid is used as an electrolyte to electrolyze a Si layer to prepare a negative electrode material for a lithium-ion battery. Background technique [0002] Energy materials are the cornerstone for the vigorous development of human beings, and their progress runs through the progress of the entire society, technology, and economy. With the progress of society, the gradual depletion of traditional energy sources and the increase in people's demand for renewable energy, the development of new energy materials research and development has become one of the important issues for human beings today. Fundamentally speaking, the most important factor is the increasing shortage of non-renewable energy resources on which human beings depend, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/52H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/52H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 刘莉丽杜长江刘春辉
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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