Lithium titanate-carbon composite nano-material, preparation method thereof and application thereof

A nano-material, lithium titanate technology, applied in the field of lithium-ion batteries, can solve the problems of increased capacity attenuation, lower rate discharge capacity, and difficult continuous conductive network of lithium-ion batteries, achieving excellent high-current charge and discharge performance and less energy loss , good electrical conductivity

Inactive Publication Date: 2010-06-23
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, commercial lithium-ion battery anode materials generally use carbon anode materials, but there are two prominent shortcomings in carbon anode materials: 1. The oxidation-reduction potential of carbon electrodes is different from that of Li + The electrode potential of /Li is very close to
When the battery is overcharged, lithium ions precipitate on the surface of the carbon electrode to form lithium dendrites, which may cause a short circuit in the battery and cause safety problems
2. The carbon negative electrode material reacts with the non-aqueous electrolyte to form a soluti

Method used

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  • Lithium titanate-carbon composite nano-material, preparation method thereof and application thereof
  • Lithium titanate-carbon composite nano-material, preparation method thereof and application thereof
  • Lithium titanate-carbon composite nano-material, preparation method thereof and application thereof

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Experimental program
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Effect test

Embodiment 1

[0042] Lithium isopropoxide and tetrabutyl titanate are mixed evenly according to the molar ratio of lithium element and titanium element being 4.4:5, and an ethanol solution of polyvinylpyrrolidone K90 is added, and ultrasonically dispersed to form a transparent sol, wherein polyvinylpyrrolidone K90 The dosage is 20% of the total mass of the sol. The prepared transparent sol was electrostatically spun into a film with a thickness of 0.2 mm at a rate of 12 mL / h at a DC voltage of 12.0 kV. Thin film precursors in N 2 Under atmospheric conditions, sinter at 500°C for 30 hours. After cooling, grind and sieve to obtain the lithium titanate-carbon composite nanofiber material provided by the present invention.

[0043] The aforementioned lithium titanate-carbon composite nanofiber material has a spinel structure. Adopt Cu target Kα radiation, λ=0.15406nm, obtain the X-ray diffraction pattern of this product, as figure 1 shown. pass Figure 4 The field emission scanning electr...

Embodiment 2

[0045] Lithium isopropoxide and tetraisopropyl titanate were uniformly mixed according to the molar ratio of lithium element to titanium element of 5.0:5, and polyaniline (M W 10000~100000) of N-methylpyrrolidone solution and graphene, ultrasonically dispersed to form a transparent sol, wherein the amount of polyaniline is 40% of the total mass of the sol, and the amount of graphene is 1% of the total mass of the sol. The prepared transparent sol was electrostatically spun into a film with a thickness of 0.2 mm at a rate of 2.0 mL / h under a DC voltage of 8.0 kV. Thin film precursors in N 2 Under atmospheric conditions, sinter at 900°C for 3 hours. After cooling, grind and sieve to obtain the lithium titanate-carbon composite nanofiber material provided by the present invention.

[0046] The aforementioned lithium titanate-carbon composite nanofiber material has a spinel structure. Adopt Cu target Kα radiation, λ=0.15406nm, obtain the X-ray diffraction pattern of this produc...

Embodiment 3

[0048] Lithium isopropoxide, titanium acetylacetonate and magnesium acetate are mixed evenly according to the molar ratio of lithium element, titanium element and magnesium element as 4:5:0.1, and polyacrylonitrile (M W 10000-100000) dimethyl sulfoxide solution, ultrasonically dispersed to form a transparent sol, wherein the amount of polyacrylonitrile is 10% of the total mass of the sol. The prepared transparent sol was electrostatically spun into a film with a thickness of 0.2 mm at a speed of 0.1 mL / h under a DC voltage of 15.0 kV. Thin film precursors in N 2 Under atmospheric conditions, sinter at 650°C for 10 hours. After cooling, grind and sieve to obtain the lithium titanate-carbon composite nanofiber material provided by the present invention.

[0049] The above-mentioned lithium titanate-carbon composite nanofiber material is a composite nanofiber material with a diameter of 100nm and a length of 2-5μm, and its X-ray diffraction diagram and transmission electron mic...

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Abstract

The invention discloses a lithium titanate-carbon composite nano-material, a preparation method thereof and application thereof. The method comprises the following steps: 1) statically spinning lithium titanate sol, or lithium titanate sol doped with a conductive substance or lithium titanate sol doped with metal ions to obtain a thin film, wherein the conductive substance is conductive metal or conductive carbon; and 2) heat treating the thin film in inert atmosphere to obtain the lithium titanate-carbon composite nano-material. The lithium titanate-carbon composite nano-material provided by the invention has a standard one-dimensional morphological structure, high crystallinity, high conductivity and high safety performance, and has high lithium ion diffusion speed and high electronic conductivity when applied as the cathode material of the lithium ion battery. Moreover, the lithium titanate-carbon composite nano-material has high charge/discharge capacity, excellent high-current charge/discharge performance and stable cycling performance. The 10c charge/discharge capacity is 125mAh/g, the 40C charge/discharge capacity reaches 95mAh/g, and the retention rate of the high-current 40C charge/discharge capacity within 3000 times reaches 85 percent.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries in a non-aqueous electrolyte system, in particular to a lithium titanate-carbon composite nanomaterial and a preparation method and application thereof. Background technique [0002] At present, commercial lithium-ion battery anode materials generally use carbon anode materials, but there are two prominent shortcomings in carbon anode materials: 1. The oxidation-reduction potential of carbon electrodes is different from that of Li + The electrode potentials of / Li are very close. When the battery is overcharged, lithium ions precipitate on the surface of the carbon electrode to form lithium dendrites, which may cause a short circuit in the battery and cause safety problems. 2. The carbon negative electrode material reacts with the non-aqueous electrolyte to form a solution interface solid electrolyte film (SEI film), which increases the capacity decay of the lithium-ion battery and reduces th...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/1391H01G9/042C08L79/02C08L39/06C08L33/20C08K3/24C08K3/04C08K13/04C08K7/00
CPCY02E60/12Y02E60/122Y02E60/13Y02E60/10
Inventor 刘文陈继涛周恒辉张新祥曹廷炳朱楠
Owner PEKING UNIV
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