A kind of preparation method of chromium-based lithium ion battery composite negative electrode material

A negative electrode material and ion battery technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of poor rate performance, fast capacity decay, low electronic conductance and ion conductance, etc. Achieve stable cycle life, uniform particles, and uniform particle size

Active Publication Date: 2020-05-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Li 5 Cr 7 Ti 6 o 25 The biggest disadvantage is that its electronic conductance and ion conductance are low, so the capacity decays quickly and the rate performance is poor when charging and discharging with a large current.

Method used

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  • A kind of preparation method of chromium-based lithium ion battery composite negative electrode material
  • A kind of preparation method of chromium-based lithium ion battery composite negative electrode material
  • A kind of preparation method of chromium-based lithium ion battery composite negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Dissolve 0.06mol tetrabutyl titanate, 0.0501mol lithium nitrate and 0.07mol chromium nitrate in a mixed solution of 500mL ethanol and benzyl alcohol (volume ratio is 1:1), add adipic acid as a chelating agent, wherein adipic acid The molar ratio to the metal cation is 1.8:1, then add 25 grams of a mixture of N,N-acrylamide and acrylamide (the mass ratio of the two is 1:6), and stir in a constant temperature water bath at 80°C until it forms Then put the gel at room temperature for 12h, then put the gel into a vacuum drying oven at 160°C and dry it for 24h to obtain a precursor. Treat for 6h, then take out the ball mill for 2h, dry and sieve, and then calcined at 800°C for 10h to obtain the target product Li 5 Cr 7 Ti 6 o 25 Material. 0.2071g of ferric nitrate (Fe(NO 3 ) 3 9H 2 O) be dissolved in deionized water, add 2.5g Li 5 Cr 7 Ti 6 o 25 Disperse and ultrasonically stir for 30 minutes, then slowly add 0.0590 g of ammonium dihydrogen phosphate aqueous solut...

Embodiment 2

[0022] Dissolve 0.06mol of isopropyl titanate, 0.0502mol of lithium acetate and 0.07mol of chromium acetate in a mixed solution of 500mL of ethanol and benzyl alcohol (1:1 by volume), and add adipic acid as a chelating agent, wherein adipic acid The molar ratio to the metal cation is 1.5:1, then add 25 grams of a mixture of N,N-acrylamide and acrylamide (the mass ratio of the two is 1:6), and stir in a constant temperature water bath at 70°C until it forms Gel, then put the gel at room temperature for 10h, then put the gel in a vacuum oven at 120°C and dry for 24h to obtain a precursor. Treat for 5 hours, then take out the ball mill for 2 hours, dry and sieve, and then calcined at 800°C for 8 hours to obtain the target product Li 5 Cr 7 Ti 6 o 25 Material. 0.0678g of ferric nitrate (Fe(NO 3 ) 3 9H 2 O) be dissolved in deionized water, add 2.5g Li 5 Cr 7 Ti 6 o 25 Disperse and ultrasonically stir for 30 minutes, then slowly add 0.0193 g of ammonium dihydrogen phospha...

Embodiment 3

[0024] Dissolve 0.06mol isopropyl titanate, 0.0502mol lithium hydroxide and 0.07mol chromium nitrate in a mixed solution of 500mL ethanol and benzyl alcohol (volume ratio is 1:1), add adipic acid as a chelating agent, wherein adipic acid The molar ratio of acid to metal cation is 2.0:1, then add 25 grams of a mixture of N,N-acrylamide and acrylamide (the mass ratio of the two is 1:6), in a constant temperature water bath at 70-100°C Stir until a gel is formed, then place the gel at room temperature for 15 hours, then put the gel in a vacuum drying oven at 180°C for 24 hours to obtain a precursor, ball mill the precursor for 3 hours, put it in a muffle furnace in air Pretreatment at 600°C for 8h, then take out the ball mill for 2h, dry and sieve, and then calcined at 800°C for 12h to obtain the target product Li 5 Cr 7 Ti 6 o 25 Material. 0.3525g of ferric nitrate (Fe(NO 3 ) 3 9H 2 O) be dissolved in deionized water, add 2.5g Li 5 Cr 7 Ti 6 o 25 Disperse and ultrason...

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Abstract

The invention discloses a preparation method of a chromium-based lithium ion battery composite anode material, which belongs to the technical field of lithium ion batteries. The specific steps of themethod are as follows: titanium source, lithium source and chromium source are dissolved in an alcoholic solution, organic acid is added, amide is then added, agitation is carried out until gel is formed, preheating treatment is carried out after drying, calcination is carried out under 800 DEG C, and thereby Li5Cr7Ti6O25 is obtained; Li5Cr7Ti6O25 is added into a ferric nitrate solution and dispersed, and an ammonium dihydrogen phosphate solution is then dripped into the solution; suction filtration, washing and drying are carried out, so that an Li5Cr7Ti6O25-FePO4 precursor is obtained; carbon fibers are added into concentrated nitric acid, and after agitation and washing by water, nitrified carbon fibers are obtained; after the nitrified carbon fibers and the precursor are ball-milled and dried, roasting is carried out, and thereby a target product is obtained. The Li5Cr7Ti6O25 composite anode material has the characteristics of uniform grain size and stable and dense structure, andhas a stable multi-level composite structure, and such a structure ensures that the chromium-based lithium ion battery composite anode material has the characteristics of high capacity and long service life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a chromium-based lithium ion battery composite negative electrode material and a preparation method thereof. Background technique [0002] With the development of various electronic devices as well as electric vehicles and hybrid vehicles, higher requirements are placed on the lithium-ion batteries that provide energy for them. Lithium-ion batteries have high capacity density and energy density, and are recognized as the most promising power batteries. At present, the anode materials of commercial lithium-ion batteries mostly use various lithium intercalation carbon / graphite materials. However, the lithium intercalation potential (0-0.26V) of carbon materials is very close to the deposition potential of metal lithium. When the battery is overcharged, metal lithium may Lithium dendrites will be precipitated on the surface of the carbon electrode, and if ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 伊廷锋潘静静朱彦荣
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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