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Mo-P co-doped lithium zinc titanate negative electrode material and preparation method thereof

A negative electrode material, lithium zinc titanate technology, applied in chemical instruments and methods, battery electrodes, inorganic chemistry, etc., can solve the problems of limited application range, complicated steps, high energy consumption, etc., shorten the diffusion path and improve electronic conductivity The effect of increasing the specific surface area

Active Publication Date: 2021-11-05
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent has restrictions on the zinc source, which must be Zn MOFs material, providing zinc source, carbon source and nitrogen source, the application range is limited, and two-step heat treatment is adopted, the steps are more complicated, and the energy consumption is relatively high

Method used

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  • Mo-P co-doped lithium zinc titanate negative electrode material and preparation method thereof
  • Mo-P co-doped lithium zinc titanate negative electrode material and preparation method thereof
  • Mo-P co-doped lithium zinc titanate negative electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0053] A Mo-P co-doped lithium zinc titanate negative electrode material, the molecular formula of the negative electrode material is Li 2 Zn 0.93 Mo 0.07 Ti 2.97 P 0.03 o 8 , where x=0.07, y=0.03.

[0054] The preparation method of above-mentioned negative electrode material, comprises the steps:

[0055] Step A: Li 2 CO 3 , ZnO, (NH 4 ) 6 Mo 7 o 24 4H 2 O, rutile TiO 2 and NH 4 h 2 PO 4 Ball milled in absolute ethanol for 5h to obtain the precursor, wherein calculated according to the amount of substance, n Li :n Zn :n Mo :n Ti :n P =2.2:0.93:0.07:2.97:0.03; the ratio of absolute ethanol to lithium source is 2.5mL:0.2g;

[0056] Step B: Dry the precursor obtained in Step A in an oven for 0.5 h at a drying temperature of 60°C;

[0057] Step C: Grinding the dry product dried in Step B for 2 minutes, transferring to a muffle furnace for calcination at 700°C for 4 hours;

[0058]Step D: Cool the heat-treated product obtained in step C to room temperature, ...

Embodiment 2

[0068] A Mo-P co-doped lithium zinc titanate negative electrode material, the molecular formula of the negative electrode material is Li 2 Zn 0.95 Mo 0.05 Ti 2.99 P 0.01 o 8 , where x=0.05, y=0.01.

[0069] The preparation method of above-mentioned negative electrode material, comprises the steps:

[0070] Step A: Change the CH 3 COOLi·2H 2 O, ZnO, (NH 4 ) 6 Mo 7 o 24 4H 2 O, anatase TiO 2 and (NH 4 ) 2 HPO 4 Stir in absolute ethanol for 4h to obtain the precursor, wherein calculated according to the amount of substance, n Li :n Zn :n Mo :n Ti :n P =2.2:0.95:0.05:2.99:0.01; the ratio of absolute ethanol to lithium source is 2mL:0.2g.

[0071] Step B: Dry the precursor obtained in Step A in an oven for 1 hour at a drying temperature of 60°C;

[0072] Step C: Grinding the dried product after drying in step B for 5 minutes, transferring it to a muffle furnace for calcination at 600°C for 5 hours;

[0073] Step D: Cool the heat-treated product obtained in st...

Embodiment 3

[0078] A Mo-P co-doped lithium zinc titanate negative electrode material, the molecular formula of the negative electrode material is Li 2 Zn 0.97 Mo 0.03 Ti 2.95 P 0.05 o 8 , where x=0.03, y=0.05.

[0079] The preparation method of above-mentioned negative electrode material, comprises the steps:

[0080] Step A: Change the CH 3 COOLi·2H 2 O, Zn(CH 3 COO) 2 2H 2 O, MoO 3 , Brookite TiO 2 and H 3 PO 4 Ball milled in absolute ethanol for 1h to obtain the precursor, wherein calculated according to the amount of substance, n Li :n Zn :n Mo :n Ti :n P =2.0:0.97:0.03:2.95:0.05; the ratio of absolute ethanol to lithium source is 1.5mL:0.2g.

[0081] Step B: Dry the precursor obtained in step A in an oven for 2 hours at a drying temperature of 60°C;

[0082] Step C: Grinding the dried product after drying in step B for 10 minutes, transferring to a muffle furnace for calcination at 550° C. for 5 hours;

[0083] Step D: Cool the heat-treated product obtained in st...

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Abstract

The invention discloses a Mo-P co-doped lithium zinc titanate negative electrode material and a preparation method thereof. The molecular formula of the negative electrode material is Li2Zn1-xMoxTi3-yPyO8, wherein x ranges from 0.03-0.09, y ranges from 0.01-0.05, and the negative electrode material is prepared by mixing and sintering a lithium source, a zinc source, a molybdenum source, a titanium source and a phosphorus source according to the molar ratio of nLi: nZn: nMo: nTi: nP = (2.0-2.3): (1-x): x: (3-y): y. The negative electrode material is high in specific discharge capacity and good in cycle and rate performance; when the negative electrode material is used as a negative electrode in a whole lithium ion battery, the battery can still release high specific capacity; and the preparation method is simple, convenient, rapid, low in energy consumption, low in cost and environment-friendly, can be widely applied to the negative electrode material of the lithium ion battery, and has a relatively good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrode materials, and in particular relates to a Mo-P co-doped lithium zinc titanate negative electrode material and a preparation method thereof. Background technique [0002] With the continuous increase of human demand for sustainable, environmentally friendly and efficient energy supply, various electrochemical energy storage devices have been developed. Among them, lithium-ion batteries have been widely studied and applied due to their excellent electrochemical performance. Graphite is a commonly used negative electrode material in traditional lithium-ion batteries, but its application in high-power lithium-ion batteries is limited due to the poor safety and rate performance of graphite. Lithium titanate (Li 4 Ti 5 o 12 , LTO) has become the second commercial lithium-ion battery anode material because it overcomes the defects of graphite anode materials. However, in the vo...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M10/0525C01G39/00C01B25/45
CPCH01M4/485H01M10/0525C01G39/006C01B25/45C01P2006/40Y02E60/10
Inventor 王利娟张重学王松冯莲晶刘欢欢
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY