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A kind of sno2/lithium iron tungstate/carbon composite nanomaterial and preparation method thereof

A composite nanomaterial, lithium iron tungstate technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of large volume change, poor cycle performance, pulverization failure, etc. The effect of high specific surface area, low production cost and low energy loss

Active Publication Date: 2018-10-23
HANGZHOU FUYANG WEIWEN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of tin-based cathode materials is that the repeated deintercalation of lithium leads to large volume changes during charge and discharge, gradually pulverization and failure, and poor cycle performance.

Method used

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  • A kind of sno2/lithium iron tungstate/carbon composite nanomaterial and preparation method thereof
  • A kind of sno2/lithium iron tungstate/carbon composite nanomaterial and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of SnO 2 / The preparation method of lithium iron tungstate / carbon composite nanomaterial, comprises the steps:

[0026] (1) lithium iron tungstate LiFe(WO 4 ) 2 Preparation: According to LiFe(WO 4 ) 2 Weigh a certain amount of lithium carbonate, iron oxide and tungsten oxide respectively; then mix the above-mentioned raw materials, put them into a ball mill jar, add zirconia balls and absolute ethanol, ball mill for 6 hours, mix and grind, Take it out and dry it; finally, roast the obtained powder at 700°C for 7 hours, and cool it down to room temperature naturally to obtain the lithium iron tungstate material;

[0027] (2) SnO 2 / Preparation of lithium iron tungstate composite material: first, weigh 10g of SnCl 4 ·5H 2 O was added to a mixed solvent of 50ml of absolute ethanol and water to prepare solution A; then 8g of lithium iron tungstate prepared in step (1) was added to solution A, stirred for 1h and then transferred to a Teflon-lined Add a certain...

Embodiment 2

[0030] A kind of SnO 2 / The preparation method of lithium iron tungstate / carbon composite nanomaterial, comprises the steps:

[0031] (1) lithium iron tungstate LiFe(WO 4 ) 2 Preparation: According to LiFe(WO 4 ) 2Weigh a certain amount of lithium carbonate, iron oxide and tungsten oxide respectively; then mix the above-mentioned raw materials, put them into a ball mill jar, add zirconia balls and absolute ethanol, ball mill for 5 hours, mix and grind, Take it out and dry it; finally, roast the obtained powder at 650°C for 8 hours, and cool it down to room temperature naturally to obtain the lithium iron tungstate material;

[0032] (2) SnO 2 / Preparation of lithium iron tungstate composite material: first, weigh 8g of SnCl 4 ·5H 2 O was added to a mixed solvent of 40ml of absolute ethanol and water to prepare solution A; then, 5g of lithium iron tungstate prepared in step (1) was added to solution A, stirred for 0.5h and then transferred to a container with a polytetra...

Embodiment 3

[0035] A kind of SnO 2 / The preparation method of lithium iron tungstate / carbon composite nanomaterial, comprises the steps:

[0036] (1) lithium iron tungstate LiFe(WO 4 ) 2 Preparation: According to LiFe(WO 4 ) 2 Weigh a certain amount of lithium carbonate, iron oxide and tungsten oxide respectively; then mix the above-mentioned raw materials, put them into a ball mill jar, add zirconia balls and absolute ethanol, ball mill for 7 hours, mix and grind, Take it out and dry it; finally, roast the obtained powder at 720°C for 6 hours, and cool it down to room temperature naturally to obtain the lithium iron tungstate material;

[0037] (2) SnO 2 / Preparation of lithium iron tungstate composite material: first, weigh 12g of SnCl 4 ·5H 2 O is added to 60ml of absolute ethanol and water mixed solvent to prepare solution A; then add 10g of lithium iron tungstate prepared in step (1) to solution A, stir for 1h and transfer to a Teflon-lined Add a certain amount of 0.5mol / L Na...

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Abstract

The invention provides a preparation method of a SnO2 / iron lithium tungstate / carbon composite nano material. The method includes the steps of: preparing an iron lithium tungstate material through a solid phase method; 2) preparing a SnO2 / iron lithium tungstate composite material and the SnO2 / iron lithium tungstate / carbon composite nano material through a hydrothermal method for two times. The material has excellent comprehensive performance and is peanut-like in shape. The material is 500-600 nm in particle length, is 40-100 nm in particle width, is 0.35-0.46 cm<3> / g in pore volume and is 60-90 m<2> / g in specific surface area. The nano material has very high specific surface area, very strong mechanical performance and high electric- and heat-conductive performance. When being used as a lithium ion battery electrode material, the nano material is beneficial to electron transmission during electrode reaction process, thereby improving electrochemical performance of the composite nano material electrode. The nano material has low absolute volume change in a charging / discharging process, has high electrochemical lithium storage capacity, excellent stable circulation performance and low energy loss, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, in particular to a kind of SnO 2 / Lithium iron tungstate / carbon composite nanomaterial and preparation method thereof. Background technique [0002] The study of nanomaterials is a frontier field in today's scientific research, and it is also a hot spot studied by many scientists all over the world. The magic and unknown aspects of nanomaterials have aroused people's widespread attention; the research and application of nanomaterials are currently hot spots and difficulties, and are also the focus of high-tech development. [0003] Nanomaterials refer to materials with a size ranging from 1 to 100 nm. After the particle size is less than 100nm, the number of surface atoms of ions is comparable to the number of atoms in their bodies. This property leads to changes in the structure and energy state of nanomaterials that are different from the small size, large surface and q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/483H01M4/5825H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 孙琴华
Owner HANGZHOU FUYANG WEIWEN ENVIRONMENTAL PROTECTION TECH CO LTD
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