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Stannic oxide composite material as well as preparation method and application thereof

A technology of tin dioxide and composite materials, which is applied in the direction of secondary batteries, electrochemical generators, active material electrodes, etc., and can solve problems such as excessive capacity failure, volume expansion effect, and poor cycle stability

Active Publication Date: 2020-07-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tin dioxide, as an anode material, has a serious volume expansion effect during charge and discharge, which leads to rapid capacity depletion and poor cycle stability.
Therefore, tin dioxide cannot be directly applied as the negative electrode material of lithium-ion batteries, and how to modify tin dioxide negative-electrode materials to improve its performance in lithium-ion batteries has become an urgent problem to be solved by those skilled in the art.

Method used

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  • Stannic oxide composite material as well as preparation method and application thereof
  • Stannic oxide composite material as well as preparation method and application thereof
  • Stannic oxide composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The present embodiment carries out the preparation of tin dioxide composite material, comprises the following steps:

[0038] 1) Take by weighing 7.5g sodium stannate trihydrate and 20g urea, measure the mixed solution of 150ml deionized water and 150ml absolute ethanol, mix the above-mentioned sodium stannate trihydrate, urea, deionized water and absolute ethanol Pour the solution into a beaker and add a magnetic stirrer, put it on the magnetic stirrer and stir for 2 hours; pour the evenly stirred mixed solution into the inner tank of the hydrothermal kettle, put the inner tank into the hydrothermal kettle, and put the hydrothermal kettle into the dry In the box, set the temperature of the drying box to 200° C., and carry out the hydrothermal reaction for 18 hours.

[0039] 2) Clean the hydrothermal reaction product, specifically: take 5 to 6 test tubes, pour off excess water from the solution after the hydrothermal reaction, add deionized water to rinse the precipitat...

Embodiment 2

[0042]The present embodiment carries out the preparation of tin dioxide composite material, with embodiment 1, but step 1) takes by weighing 8g sodium stannate trihydrate, stirs 1h; Step 3) in the first ball mill, weighs 0.7g above-mentioned prepared Pour tin oxide and 0.15g of silicon oxide into a ball mill tank for the first ball milling, the mass ratio of material to beads is 1:35; step 3) weigh 0.15g of graphite for the second ball milling.

Embodiment 3

[0044] This embodiment carries out the preparation of tin dioxide composite material, with embodiment 1, but step 1) take by weighing 8g sodium stannate trihydrate and 24g urea, stir 1h; Step 3) in the first ball mill, weigh 0.7g above-mentioned preparation The obtained tin dioxide and 0.05g of silicon were poured into a ball mill jar, the mass ratio of material to beads was 1:25, and the first ball mill was carried out for 20 hours; step 3) 0.15g of graphite was weighed for the second ball mill for 10 hours.

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Abstract

The invention belongs to the technical field of battery electrode materials, and particularly relates to a stannic oxide composite material and a preparation method and application thereof. The invention provides a stannic oxide composite material. The stannic oxide composite material is of a sheet structure. The stannic oxide composite material comprises stannic oxide, silicon dioxide and graphite, and the stannic oxide and the silicon dioxide are coated in the graphite. In the present invention, silicon dioxide and graphite are used for modifying tin dioxide, silicon dioxide has high specific capacity, stannic oxide and silicon dioxide are coated in graphite, the stannic oxide composite material is of a sheet structure and can effectively inhibit volume expansion of stannic oxide, and experimental results show that the stannic oxide composite material serving as a negative electrode material is applied to a lithium battery and is good in conductivity, cycle performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of battery electrode materials, and in particular relates to a tin dioxide composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices such as mobile phones, notebook computers, tablet computers, and major electric vehicles due to their excellent performance such as high working voltage, high energy density, environmental friendliness, and no memory effect. With the enhancement of people's awareness of environmental protection and the rising price of oil, new energy industries such as electric bicycles and electric vehicles have good development prospects. Lithium-ion batteries have become the preferred power batteries for electric vehicles because of their many advantages above. However, as a power battery, lithium-ion batteries still face many challenges due to issues such as safety performance and energy ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/48H01M10/0525
CPCH01M4/362H01M4/483H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 柯进何苗冯叶锋熊德平
Owner GUANGDONG UNIV OF TECH
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