Carbon/titanium niobium oxide composite negative electrode material and preparation and application thereof

A technology of titanium-niobium oxide and composite materials, which is applied in the field of lithium-ion batteries and can solve the problems of poor conductivity of titanium-niobium oxide negative electrode materials

Active Publication Date: 2019-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention solves the problem of poor conductivity of titanium-niobium oxide negative electrode materials prepared by existing methods, and provides a method for preparing carbon / titanium-niobium oxide composite materials by using ultracentrifugation and sol-gel method

Method used

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  • Carbon/titanium niobium oxide composite negative electrode material and preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0024] In this embodiment, the carbon / titanium niobium oxide negative electrode composite material for lithium ion supercapacitor is carried out according to the following steps:

[0025] (1) According to titanium niobium oxide TiNb 2 o 7 The stoichiometric ratio, respectively weighed 8.5mL butyl titanate and 13.3g niobium pentoxide dispersed in 100mL absolute ethanol;

[0026] (2) Weigh 0.2g of CNT and place it in a beaker containing 200mL of ethanol. After ultrasonication at 600W for 1h, the ethanol dispersion of butyl titanate and niobium pentoxide in step (1) is slowly Added to the ethanol solution of CNT;

[0027] (3) Add the above mixed solution into a centrifuge tube and perform ultracentrifugation at a speed of 61000 r / min for 8 minutes. After centrifugation, the product was heated at 70 °C for 20 h to obtain the precursor of the titanium-niobium oxide composite material; it was heated in 3% H 2 In a reducing atmosphere of Ar / Ar, react at a temperature of 700° C. f...

Embodiment 2

[0033] The carbon / titanium niobium oxide composite material and battery were prepared by the same method as in Example 1, except that the content of CNT was 10% by mass.

Embodiment 3

[0034] Example 3: The carbon / titanium niobium oxide composite material and battery were prepared by the same method as in Example 1, except that the carbon material was graphene, and its mass percentage was 5%.

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Abstract

The invention relates to a carbon / titanium niobium oxide composite negative electrode material and preparation and application thereof. The mass content of the titanium niobium oxide in the compositenegative electrode material is 90-95%, and the mass content of carbon in the composite material is 5-10%. Compared with the prior art, the invention adopts an ultra-centrifugal effect and a sol-gel method and introduces a carbon material with high conductivity, the high-conductivity titanium niobium oxide composite material with a nano size is prepared, and nano-channels of the particles increasethe effective reaction area of the electrode and access channels of ions; and the introduction of the carbon material can form an effective conductive network in the composite material so as to improve the conductivity of the material, and meanwhile, the carbon material plays a role of supporting and coating the titanium niobium oxide, thereby improving the cycle performance of the titanium niobium oxide while improving the rate performance thereof.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a negative electrode material for lithium ion supercapacitors. Background technique [0002] Electrochemical supercapacitor is an energy storage device based on the mechanism of electric double layer or Faraday quasi-capacitance. It has attracted extensive attention due to its advantages such as fast charge and discharge speed, high power density, long cycle life, and wide operating temperature range. Compared with lithium-ion batteries, electrochemical capacitors have relatively low energy density, but their long cycle life is widely used in electric vehicle starting devices, pulse power supplies, and mobile backup power supplies. With the hybrid electric vehicle and its demand for high power density and energy density, lithium-ion supercapacitors have received more and more attention as a new type of energy storage device. However, since lithium-ion supercapacito...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/38H01G11/46H01G11/86H01G11/50
CPCY02E60/13
Inventor 刘翠连张华民张洪章李先锋曲超
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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