A kind of preparation method of chromium-titanium-based lithium-ion battery multi-level structure negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, structural parts, secondary batteries, etc., can solve the problems of fast capacity decay, poor rate performance, low electronic conductance and ion conductance, and achieve uniform and stable particles Effect of cycle life and particle size uniformity

Active Publication Date: 2020-05-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • A kind of preparation method of chromium-titanium-based lithium-ion battery multi-level structure negative electrode material
  • A kind of preparation method of chromium-titanium-based lithium-ion battery multi-level structure negative electrode material
  • A kind of preparation method of chromium-titanium-based lithium-ion battery multi-level structure negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 0.1mol lithium carbonate and 0.1mol Al 2 o 3 Put it in a ball mill, mill it for 5 hours, then put it in a muffle furnace and bake it at 650°C for 10 hours. After cooling to room temperature, pass it through a fine sieve to obtain α-LiAlO 2 White powder( figure 1 ). Dissolve 0.06mol tetrabutyl titanate, 0.0501mol lithium nitrate and 0.07mol chromium nitrate in 550mL of ethanol and ethylene glycol mixed solution (volume ratio is 1:3), add organic acid (adipic acid and citric acid The mixture, the molar ratio is 1:1) is a chelating agent, wherein the molar ratio of organic acid to metal cation is 1.2:1, stirred in a constant temperature water bath at 80°C until a gel is formed, and then the gel is placed at room temperature for 12h , and then put the gel into a vacuum drying oven at 150°C for 24 hours to obtain a precursor; then 0.3165 grams of α-LiAlO 2 The powder is mixed with the precursor, the precursor is ball-milled for 4 hours, put into a muffle furnace and pret...

Embodiment 2

[0023] 0.1mol lithium carbonate and 0.1mol Al 2 o 3 Put it in a ball mill, mill it for 5 hours, then put it in a muffle furnace and bake it at 650°C for 10 hours. After cooling to room temperature, pass it through a fine sieve to obtain α-LiAlO 2 White powder. Dissolve 0.06mol of isopropyl titanate, 0.0502mol of lithium acetate and 0.07mol of chromium acetate in a mixed solution of 550mL of ethanol and ethylene glycol (volume ratio of 1:3), add organic acid (adipic acid and citric acid The mixture, the molar ratio is 1:1) is a chelating agent, wherein the molar ratio of organic acid to metal cation is 1:1, stirred in a constant temperature water bath at 70°C until a gel is formed, and then the gel is placed at room temperature for 10h , and then put the gel into a vacuum drying oven at 120°C for 24 hours to obtain a precursor; then 0.3165 grams of α-LiAlO 2 The powder is mixed with the precursor, the precursor is ball milled for 4 hours, put into a muffle furnace and pretre...

Embodiment 3

[0025] 0.1mol lithium carbonate and 0.1mol Al 2 o 3 Put it in a ball mill, mill it for 5 hours, then put it in a muffle furnace and bake it at 650°C for 10 hours. After cooling to room temperature, pass it through a fine sieve to obtain α-LiAlO 2 White powder. Dissolve 0.06mol tetrabutyl titanate, 0.0501 lithium hydroxide and 0.07mol chromium acetate in a mixed solution of 550mL ethanol and ethylene glycol (volume ratio is 1:3), add organic acid (adipic acid and citric acid The mixture, the molar ratio is 1:1) is a chelating agent, wherein the molar ratio of organic acid to metal cation is 1.8:1, stirred in a constant temperature water bath at 100°C until a gel is formed, and then the gel is placed at room temperature for 15h , and then put the gel into a vacuum drying oven at 180°C for 24 hours to obtain a precursor; then 0.3165 grams of α-LiAlO 2 The powder is mixed with the precursor, the precursor is ball milled for 4 hours, put into a muffle furnace and pretreated at 6...

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Abstract

The invention discloses a preparation method of a negative electrode material of the multistage structure of a chromium-titanium-based lithium-ion battery, and belongs to the technical field of lithium-ion batteries. The method includes the steps that a titanium source, a lithium source and a chromium source are dissolved in an alcohol solution, organic acid is added and serves as a chelating agent, stirring is conducted until gel is formed, and vacuum drying is conducted; alpha-LiALO2 prepared in advance is mixed with a precursor, pre-high-temperature treatment is conducted in the air, then ball-milling is conducted, and calcination is conducted at 800 DEG C to obtain Li5Cr7Ti6O25-LiAlO2; after mixing and ball-milling are conducted on the Li5Cr7Ti6O25-LiAlO2 and a nitrified carbon nano tube, the mixture is treated in an inert atmosphere, and an obtained product is the Li5Cr7Ti6O25@alpha-LiAlO2@CNT. The negative electrode material compounded through the method has even and uniform particles, the diversity is high, the crystallinity degree is high, and the negative electrode material has the stable multistage composite structure, so that the negative electrode material has considerable reversible capacity of wide potential windows, high rate performance, stable cycle life and a very high actual use value.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a multi-level structure negative electrode material for a chromium-titanium-based lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in industrial production, transportation, social life and other fields because of their advantages such as long service life, no memory effect, high energy density, low pollution, and high output voltage. In lithium-ion batteries, graphite-based carbon-based materials are used in the negative electrode materials of consumer industrial lithium battery products in the current market. However, the charge-discharge platform of carbon anode materials is relatively low and close to the reduction potential of lithium metal. During the use of the battery, with continuous charge and discharge, lithium ions are easy to deposit on the carbon anode to form needle-like lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 伊廷锋朱彦荣
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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