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Preparation method of multilevel structure titanate negative electrode material for lithium ion battery

A technology for structural titanate, lithium ion batteries, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problem of reducing full battery energy density, low lithium ion diffusion rate, low theoretical capacity and other issues, to achieve the effects of excellent rate performance, cheap and easy availability of raw materials, and improved energy density and power density

Active Publication Date: 2018-03-02
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the relatively low lithium ion diffusion rate, low electrical conductivity, and low theoretical capacity all restrict Li 4 Ti 5 o 12 Wider range of applications; in addition, a relatively high voltage platform (1.55V vs. Li + / Li), significantly reduced the Li 4 Ti 5 o 12 As the full battery voltage of the negative electrode, which in turn reduces the energy density of the full battery

Method used

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  • Preparation method of multilevel structure titanate negative electrode material for lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0015] Disperse 0.06mol tetrabutyl titanate and 0.02mol sodium acetate in a mixed solution of ethylene glycol and absolute ethanol (volume ratio 1:1), and stir for 5-8 hours to obtain solution A; dissolve 0.01mol barium nitrate in The aqueous solution of ethanol (volume ratio 1:1) is solution B. The solutions A and B were quickly mixed and vigorously stirred, and the temperature was raised to 80°C. After the liquid was evaporated to dryness, it was placed in a vacuum drying oven at 90°C for 12 hours in vacuum. Then put the precursor in a muffle furnace at 400°C for 6 hours, cool to room temperature, mill in a ball mill for 4 hours, sieve, put it in a muffle furnace and burn at 1000°C for 12 hours, cool to room temperature, and ball mill 24h, the lithium-ion battery negative electrode material BaNa 2 Ti 6 o 14 Material. Take 10g of the resulting BaNa 2 Ti 6 o 14 The material is dispersed into an acetone solution, and 0.2 g of ordinary multi-walled carbon nanotubes (CNT, ...

Embodiment 2

[0017] Disperse 0.06mol tetrabutyl titanate and 0.02mol sodium nitrate in a mixed solution of ethylene glycol and absolute ethanol (volume ratio 1:1), and stir for 5 hours to obtain solution A; dissolve 0.01mol barium acetate in ethanol Aqueous solution (volume ratio 1:1), namely solution B. The solutions A and B were quickly mixed and vigorously stirred, and the temperature was raised to 80°C. After the liquid was evaporated to dryness, it was placed in a vacuum drying oven at 90°C for 12 hours in vacuum. Then put the precursor in a muffle furnace at 400°C for 4 hours, cool to room temperature, ball mill in a ball mill for 3 hours, sieve, put it in a muffle furnace and burn at 900°C for 10 hours, cool to room temperature, and ball mill 24h, the lithium-ion battery negative electrode material BaNa 2 Ti 6 o 14 Material. Take 10g of the resulting BaNa 2 Ti 6 o 14 The material is dispersed into an acetone solution, and 0.1g of carbon nanotubes (CNT, diameter 30-50μm, bulk ...

Embodiment 3

[0019] Disperse 0.02mol sodium nitrate and 0.06mol isopropyl titanate in a mixed solution of ethylene glycol and absolute ethanol (volume ratio 1:1), and stir for 8 hours to obtain solution A; dissolve 0.01mol barium acetate in ethanol Aqueous solution (volume ratio 1:1), namely solution B. The solutions A and B were quickly mixed and vigorously stirred, and the temperature was raised to 80°C. After the liquid was evaporated to dryness, it was placed in a vacuum drying oven at 120°C for vacuum drying for 12 hours. Then put the precursor in a muffle furnace at 600°C for 6 hours, cool to room temperature, mill in a ball mill for 4 hours, sieve, put it in a muffle furnace and burn at 1100°C for 15 hours, cool to room temperature, and ball mill 24h, the lithium-ion battery negative electrode material BaNa 2 Ti 6 o 14 Material. Take 10g of the resulting BaNa 2 Ti 6 o 14 The material is dispersed into an acetone solution, and 0.5g of carbon nanotubes (CNT, diameter 30-50μm, b...

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Abstract

The invention discloses a preparation method of a multilevel structure titanate negative electrode material for a lithium ion battery, and belongs to the technical field of lithium ion batteries. Themethod concretely comprises the following steps: dispersing a sodium source and a titanium source in a glycol and anhydrous ethanol mixed solution to form a solution A; dissolving a barium source in an aqueous solution of anhydrous ethanol to form a solution B; mixing and stirring the solution A and the solution B, heating the obtained solution until evaporative drying is achieved, placing the obtained precursor in a muffle furnace, and carrying out pre-calcining, ball milling and calcining to obtain a BaNa2Ti6O14 material; dispersing the material in an acetone solution, adding carbon nano-tubes, and stirring and heating the obtained solution until the solution is completely volatilized in order to obtain BaNa2Ti6O14-CNT; and carrying out mixing and ball-milling on the BaNa2Ti6O14-CNT andcarbon fibers, and sintering the obtained mixture in nitrogen to obtain the target product. The titanate negative electrode material obtained in the invention has a stable multilevel composite structure, so the titanate negative electrode material has the advantages of considerable wide potential window reversible capacity, excellent rate performances and stable cycle life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a titanate negative electrode material of a lithium ion battery, in particular to a preparation method of a titanate negative electrode material with a multi-level structure. Background technique [0002] Traditional fossil energy is facing the crisis of shortage or even depletion, and it has brought huge pressure to environmental protection. The new industrialization development direction of circular economy and low-carbon economy will promote the rapid development of new energy automobile industry. As a new generation of environmentally friendly and high-energy batteries, lithium-ion power batteries have become the mainstream product of power batteries for new energy vehicles. Although the protection circuit of lithium-ion batteries is relatively mature, for power batteries, the selection of negative electrode materials is very critical to truly ensure...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 伊廷锋朱彦荣
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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