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Cu-doped lithium zinc titanate negative electrode material and preparation method thereof

A technology of lithium zinc titanate and negative electrode material, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of crystal structure distortion, poor material cycle performance, etc., to reduce the preparation cost, high production efficiency, and low energy consumption Effect

Active Publication Date: 2013-09-11
珠海长兴新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Li 4 Ti 5 o 12 The theoretical capacity of graphite is only half of that of graphite, and the lithium intercalation potential is high, so the development of negative electrode materials with good cycle performance and high capacity is still the focus of research in this field; lithium zinc titanate Li 2 ZnTi 3 o 8 As an insertion-type lithium-ion battery anode material, it has a series of advantages, such as large specific capacity, good cycle performance, and high rate performance; among them, Li and Zn of 1:1 are located in the tetrahedral position of the crystal structure, and Li and Zn of 1:3 Li and Ti are located in the octahedral position. Due to the difference in bond length, the crystal structure is distorted to a certain extent, resulting in poor cycle performance of the material.

Method used

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  • Cu-doped lithium zinc titanate negative electrode material and preparation method thereof
  • Cu-doped lithium zinc titanate negative electrode material and preparation method thereof
  • Cu-doped lithium zinc titanate negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] x=0.05, the molecular formula is: Li 2 Zn 0.95 Cu 0.05 Ti 3 o 8 , the preparation process is as follows:

[0025] Weigh out 1 gram of H 2 Ti 3 o 7 , 0.287 g Li 2 CO 3 Put it into a beaker, add 20ml of absolute ethanol, mix well, weigh 0.809g of Zn(CH 3 COO) 2 2H 2 O and 0.039 g Cu(CH 3 COO) 2 ·H 2 O was added to the above solution, and the above solution was evaporated to dryness at 70°C with stirring, ground, placed in a muffle furnace, heated to 750°C at 3°C / min, and kept for 5 hours to obtain a Cu-doped lithium zinc titanate product .

[0026] Weigh 0.7 g of the product, mix it with acetylene black and PVDF in a mass ratio of 70:20:10, stir evenly, coat it on a copper foil, place it in a vacuum oven, and dry it under vacuum at 120°C for 24 Hours, after rolling and punching, the electrode sheet was obtained; with the metal lithium sheet as the counter electrode and 1M LiPF6 EC:DEC:EMC solution as the electrolyte, a simulated battery was formed for elec...

Embodiment 2

[0028] x=0.1, the molecular formula is: Li 2 Zn 0.9 Cu 0.1 Ti 3 o 8 , the preparation process is as follows:

[0029] Weigh out 1 gram of H 2 Ti 3 o 7 , 0.287 g Li 2 CO 3 Put it into a beaker, add 20ml of absolute ethanol, mix well, weigh 0.767g of Zn(CH 3 COO) 2 2H 2 O and 0.078 g Cu(CH 3 COO) 2 ·H 2 O was added to the above solution, and the above solution was evaporated to dryness at 70°C with stirring, ground, placed in a muffle furnace, heated to 750°C at 3°C / min, and kept for 5 hours to obtain a Cu-doped lithium zinc titanate product .

[0030] Weigh 0.7 g of the product, mix it with acetylene black and PVDF in a mass ratio of 70:20:10, stir evenly, coat it on a copper foil, place it in a vacuum oven, and dry it under vacuum at 120°C for 24 Hours, after rolling and punching, the electrode sheet was obtained; with the metal lithium sheet as the counter electrode and 1M LiPF6 EC:DEC:EMC solution as the electrolyte, a simulated battery was formed for electro...

Embodiment 3

[0032] x=0.15, the molecular formula is: Li 2 Zn 0.85 Cu 0.15 Ti 3 o 8 , the preparation process is as follows:

[0033] Weigh out 1 gram of H 2 Ti 3 o 7 , 0.287 g Li 2 CO 3 Put it into a beaker, add 20ml of absolute ethanol, mix well, weigh 0.724g of Zn(CH 3 COO) 2 2H 2 O and 0.116 g Cu(CH 3 COO) 2 ·H 2 O was added to the above solution, and the above solution was evaporated to dryness at 70°C with stirring, ground, placed in a muffle furnace, heated to 750°C at 3°C / min, and kept for 5 hours to obtain a Cu-doped lithium zinc titanate product .

[0034] Weigh 0.7 g of the product, mix it with acetylene black and PVDF in a mass ratio of 70:20:10, stir evenly, coat it on a copper foil, place it in a vacuum oven, and dry it under vacuum at 120°C for 24 Hours, after rolling and punching, the electrode sheet is obtained; the metal lithium sheet is used as the counter electrode, and the EC: DEC: EMC (volume ratio = 1:1:1) solution of 1M LiPF6 is used as the electrolyte...

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Abstract

The invention relates to an electrode material and a preparation method thereof, and in particular relates to a Cu-doped lithium zinc titanate negative electrode material and a preparation method thereof. The Cu-doped lithium zinc titanate negative material is characterized by having a molecular formula of Li2Zn1-xCuxTi3O8, wherein x is more than 0 and less than or equal to 0.15. The preparation method comprises the following steps of: weighing a titanium source, a lithium source, a zinc source and a copper source, uniformly mixing and then drying; and sintering at 750 DEG C for 5 hours, then naturally cooling to the room temperature, and grinding. After Cu is doped, Cu<2+> can be distributed at a tetrahedron position and an octahedron position in a ratio of 3:2, so that the arrangement of ions in the material generates changes slightly, and the stability of a crystal structure of the material during charging and discharging is improved.

Description

Technical field: [0001] The invention relates to an electrode material and a preparation method thereof, in particular to a Cu-doped zinc lithium titanate negative electrode material and a preparation method thereof. Background technique: [0002] The core technology of lithium-ion batteries is a lithium storage material that can reversibly deintercalate lithium. At present, the anode materials of commercialized lithium-ion batteries mostly use various lithium-intercalation carbon materials, which is due to the fact that carbon electrodes have a lower discharge platform than metal lithium and have a higher lithium-intercalation capacity. However, since the potential of the carbon electrode after lithium insertion is very close to that of metal lithium, it is less than 0.1V vs Li / Li + , when the battery is overcharged, metal lithium may precipitate on the surface of the carbon electrode to form lithium dendrites, which will cause a short circuit; and most electrolytes are un...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/1391
CPCY02E60/10
Inventor 唐致远郄富昌凌国维
Owner 珠海长兴新能源科技有限公司
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