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A carbon-silicon-coated tin dioxide composite, its preparation method, and its application as a negative electrode material for lithium-ion batteries

A silicon-oxygen compound, lithium-ion battery technology, used in carbon compounds, tin oxide, battery electrodes, etc., can solve problems such as limited applications, and achieve the effects of good conductivity, wide sources, and high reversible specific capacity

Active Publication Date: 2022-04-12
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with SnO 2 Similarly, the large volume change (about 400%) of silicon particles limits its application in LIBs.

Method used

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  • A carbon-silicon-coated tin dioxide composite, its preparation method, and its application as a negative electrode material for lithium-ion batteries
  • A carbon-silicon-coated tin dioxide composite, its preparation method, and its application as a negative electrode material for lithium-ion batteries
  • A carbon-silicon-coated tin dioxide composite, its preparation method, and its application as a negative electrode material for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 2g of ball-milling waste sawdust and 10g of ionic liquid (1-butyl-3-methylimidazolium dihydrogen phosphate) into a three-neck flask and stir at 400r / min for 6h, then put the mixture in a boat, and put it in a tube-type high-temperature furnace For sintering, the heating rate is 3°C / min, heated from 50°C to 1200°C, kept at a constant temperature for 4 hours, and then cooled to room temperature at 5°C / min, the sample is taken out, ground into powder, and sieved to obtain the desired biochar material. Si and SnO 2 The nanoparticles were ball milled for 10 hours at a molar ratio of 1:1, and the rotating speed was 800r / min. After the ball milling, biochar was added (according to 100% carbon element, biochar: Si:SnO 2 =2:1:1 (molar ratio)), the rotating speed is constant, continue ball milling for 10h and sieve to obtain the negative electrode material of lithium ion battery.

Embodiment 2

[0037] Take 2g of microcrystalline cellulose and 6g of ionic liquid (1-butyl-3-methylimidazolium acetate) and put them into a three-neck flask and stir at 400r / min for 6h, then put the mixture in a boat, and put it in a tube-type high-temperature furnace For sintering, the heating rate is 3°C / min, heated from 50°C to 1200°C, kept at a constant temperature for 4 hours, and then cooled to room temperature at 10°C / min, and the sample is taken out and ground into powder to obtain the desired biochar material. Si and SnO 2 Nanoparticles were ball milled for 10 hours at a molar ratio of 1:1, and the rotating speed was 600r / min. After the ball milling, biochar was added (according to 100% carbon element, biochar: Si:SnO 2 =2:1:1 (molar ratio)), the rotating speed is constant, continue ball milling for 10h and sieve to obtain the negative electrode material of lithium ion battery.

Embodiment 3

[0039] Take 2g of waste sawdust and 6g of ionic liquid (1-butyl-3-methylimidazolium dihydrogen phosphate) into a three-necked flask and stir at 400r / min for 10h, then put the mixture in a boat and sinter it in a tubular high-temperature furnace , the heating rate was 3°C / min, heated from 50°C to 1600°C, kept at a constant temperature for 4 hours, and then cooled to room temperature at 10°C / min, the sample was taken out and ground into powder to obtain the desired biochar material. Si and SnO 2 The nanoparticles were ball milled for 10 hours at a molar ratio of 1:1, and the rotating speed was 800r / min. After the ball milling, biochar was added (according to 100% carbon element, biochar: Si:SnO 2 =2:1:1 (molar ratio)), the rotating speed is constant, continue ball milling for 10h and sieve to obtain the negative electrode material of lithium ion battery.

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Abstract

The invention discloses a carbon-silicon-coated tin dioxide compound and its preparation method and its application as a lithium-ion battery negative electrode material. The ground biomass is mixed with an ionic liquid and carbonized to obtain biochar; the silicon powder and SnO 2 The nanoparticles are mixed and then ball-milled to obtain silicon oxide-coated tin dioxide nanoparticles; biochar is added to silicon-oxygen compound-coated tin dioxide nanoparticles, and ball milling is continued to obtain biocarbon silicon-coated tin dioxide composites; finally, the The bio-carbon silicon-coated tin dioxide compound is obtained by sieving. The invention adopts the ball milling method to simply and conveniently prepare the required carbon-silicon-coated tin dioxide composite negative electrode material, which has high reversible specific capacity, good conductivity and good cycle performance.

Description

technical field [0001] The invention relates to a carbon-silicon-coated tin dioxide compound, a preparation method thereof and an application as a negative electrode material of a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries (LIBs) are widely used in electronic devices and electric vehicles (EVs). With the rapid development of electronic devices and electric vehicles (EVs), it is urgent to find anode materials with high capacity, long cycle life and good conductivity. To replace the commercial graphite anode (its specific capacity is limited, only 372mAh g -1 , with poor rate performance). In recent years, people have devoted themselves to using high specific capacity materials such as metal oxides to construct anodes for lithium-ion batteries with composite structures. SnO 2 As a high theoretical capacity (about 1493mAh g -1 ), low-cost, and environmentally friendly potential anode ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525C01B32/05C01B32/205C01B33/02C01G19/02
CPCH01M4/366H01M4/483H01M4/625H01M4/628H01M10/0525C01G19/02C01B32/205C01B32/05C01B33/02C01P2002/72C01P2004/03C01P2006/40H01M2004/021H01M2004/027Y02E60/10
Inventor 于阳陈健强
Owner NANJING FORESTRY UNIV