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Tin-based composite oxide material as well as preparation method and application thereof

A technology of composite oxides and tin compounds, which is applied in electrode manufacturing, structural parts, electrical components, etc., can solve problems such as uneven size, safety, and poor electrical contact performance of materials, and achieve simple synthesis methods, unique structures, and particle sizes. uniform effect

Inactive Publication Date: 2011-04-20
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of the specific surface area will easily cause more lithium to participate in the surface film-forming reaction during the first charge and discharge process. At the same time, nanomaterials have high specific surface energy and are prone to agglomeration. The agglomeration makes the electrical contact between the particles inside the electrode weaken rapidly. The capacity and cycle performance deteriorate; in addition, nanoparticles are easy to pass through the separator and accumulate on the counter electrode, resulting in self-discharge and safety problems; moreover, the size of nanoparticles and conductive agents such as acetylene black is not uniform, and it is difficult to mix materials. Poor contact performance hinders the application of nanomaterials in lithium-ion batteries

Method used

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  • Tin-based composite oxide material as well as preparation method and application thereof
  • Tin-based composite oxide material as well as preparation method and application thereof
  • Tin-based composite oxide material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of tin-based composite oxide: 3.1g SnCl 4 and 11.4 g Na 2 HPO 4 Add it into 40mL of deionized water, stir well, then add 10.6g of HF 10wt% solution. Dissolve 2.9g of sodium dodecyl sulfate (SDS) in 20mL of deionized water, then mix it with the above solution, stir thoroughly on a magnetic stirrer for 1h, and then transfer the resulting suspension to a 70mL polytetrafluoroethylene liner In a hydrothermal kettle, seal the lid tightly and react in an oven at 150°C for 12h. After the reaction kettle was cooled to room temperature, the obtained precipitate was filtered and washed repeatedly with distilled water. Finally, the reaction product was placed in a ceramic pot and directly heated in a muffle furnace at 300°C for 3 hours, then cooled and ground.

[0035] Scanning electron microscope test of the product: JSM-7401F field emission scanning electron microscope, the working voltage is 200kV, the scanning electron microscope picture is shown in Figure 1, the...

Embodiment 2

[0039] Preparation of tin-based composite oxide: 3.1g SnCl 4 and 11.4 g Na 2 HPO 4 Add it into 40mL of deionized water, stir well, then add 10.6g of HF 10wt% solution. Dissolve 2.9g of SDS in 20mL of deionized water, then mix it with the above solution, stir it fully on a magnetic stirrer for 1h, then transfer the resulting suspension to a 70mL polytetrafluoroethylene liner hydrothermal kettle, seal it tightly The lid of the kettle was reacted in an oven at 150°C for 6h. After the reaction kettle was cooled to room temperature, the obtained precipitate was filtered and washed repeatedly with distilled water. Finally, the reaction product was placed in a ceramic pot and directly heated in a muffle furnace at 300°C for 3 hours, then cooled and ground.

[0040] The scanning electron microscope test of the product: JSM-7401F field emission scanning electron microscope, the working voltage is 200kV, the scanning electron microscope picture is as follows Figure 4 As shown, each...

Embodiment 3

[0042] Preparation of tin-based composite oxide: 3.1g SnCl 4 and 11.4 g Na 2 HPO 4 Add it into 40mL of deionized water, stir well, then add 10.6g of HF 10wt% solution. Dissolve 2.9g of SDS in 2CmL of deionized water, then mix with the above solution, fully stir on a magnetic stirrer for 1h, then transfer the resulting suspension to a 70mL polytetrafluoroethylene liner of hydrothermal kettle, seal tightly The lid of the kettle was reacted in an oven at 150°C for 9h. After the reaction kettle was cooled to room temperature, the obtained precipitate was filtered and washed repeatedly with distilled water. Finally, the reaction product was placed in a ceramic pot and directly heated in a muffle furnace at 300°C for 3 hours, then cooled and ground.

[0043] The scanning electron microscope test of the product: JSM-7401F field emission scanning electron microscope, the working voltage is 200kV, the scanning electron microscope picture is as follows Figure 5 As shown, each build...

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Abstract

The invention provides a tin-based composite oxide material comprising a tin-based composite oxide with a structure of porous micro balls, wherein the micro balls are formed by mutually connecting nanosheets as construction units; the diameters of the micro balls are 1-3mu m; the chemical formula of the tin-based composite oxide is SnPxOy; X is more than 1 and less than 1.5, and y is more than 3.5 and less than 4.5. The invention also provides a preparation method and application of the tin-based composite oxide material. The tin-based composite oxide has perfect structure, high crystallization degree and excellent electrochemical performance, is not easy to aggregate and can improve the circulating performance, high multiplying power discharge performance, safety performance and capacity of the battery. The preparation method is simple and easy to realize.

Description

technical field [0001] The invention relates to a tin-based composite oxide material and its preparation method and application. Background technique [0002] Sn-based oxides are widely used in our daily life, especially for their excellent electrochemical properties, such as high specific capacity compared to carbon-based materials; there is no solvent similar to graphite-based materials in the lithium intercalation process Co-intercalation phenomenon; its lithium intercalation potential is higher 0.05V-1.0V vs. Li / Li+, which improves the high-rate discharge performance of the material, and has a wide range of applications in the negative active material of lithium-ion batteries or the electrode material of capacitors. Application prospects. [0003] However, its application is also restricted by some factors. For example, in batteries, due to its high lithium intercalation potential, it is easy to cause the working voltage of the battery to drop, resulting in the loss of ...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/04H01G9/04
CPCY02E60/12Y02E60/10Y02E60/13
Inventor 王强
Owner BYD CO LTD
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