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Niobium-tungsten-titanium oxide negative electrode material and preparation method and application thereof

A technology of titanium oxide and negative electrode materials, applied in the field of niobium tungsten titanium oxide negative electrode materials and its preparation, can solve the problems of poor rate, stability, and low capacity, and achieve enhanced rate performance, uniform particle distribution, and excellent electrochemical performance Effect

Pending Publication Date: 2021-12-03
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, CN201910693051.X discloses a method for preparing micron rod-shaped niobium-tungsten oxides by wet gel method, and successfully prepared ternary niobium-tungsten oxides Nb 14 W 3 o 44 material, although it has good rate performance, its capacity is low; similarly, CN201310582565.0 discloses a hydrothermal method for preparing TiNb 2 o 7 The method of the material, and the capacity of this material is high, but its rate and stability are poor

Method used

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  • Niobium-tungsten-titanium oxide negative electrode material and preparation method and application thereof
  • Niobium-tungsten-titanium oxide negative electrode material and preparation method and application thereof
  • Niobium-tungsten-titanium oxide negative electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] (1) General formula Nb 14 W 3 Ti z o (44+2z) Among them, take z=1.

[0062] (2) First, weigh niobium pentoxide and tungsten trioxide in a molar ratio of 7:3, and then mix them for ball milling. The ball milling speed is 400 rpm, and the milling time is 24 hours.

[0063] (3) Then take tetrabutyl titanate of corresponding mass in the glove box (according to niobium: tungsten: titanium molar ratio is 14:3:1 and take the tetrabutyl titanate of corresponding molar mass), add step (2) The obtained powder was uniformly mixed, and then the mixed product was sealed and heated at 200° C. for 24 hours to obtain a precursor; the whole process was carried out under an argon atmosphere. The obtained precursor was placed in a crucible, placed in a tube furnace, and pre-calcined at 700°C for 6h in a nitrogen atmosphere, then heated at a rate of 10°C / min, and then calcined at 1050°C for 4h to obtain Nb 14 W 3 TiO 46 Niobium tungsten titanium oxide material.

[0064] The resulti...

Embodiment 2

[0074] The preparation process is basically the same as in Example 1, except that the titanium source added in step (3) is isopropyl titanate (the same molar ratio of titanium elements), and other conditions are the same.

Embodiment 3

[0079] In this embodiment, in order to determine the optimal ratio, the composition of the titanium content in the material is changed for preparation, wherein the titanium source is titanium dioxide, an inorganic titanium source.

[0080] (1) General formula Nb 14 W 3 Ti z o (44+2z) Among them, take z=0.5, 1, 1.5.

[0081] (2) According to the different z in the general formula, the molar ratios of niobium:tungsten:titanium elements are 14:3:0.5, 14:3:1, 14:3:1.5 respectively, and the corresponding molar masses of niobium pentoxide and triniobium pentoxide are selected. The tungsten oxide and titanium dioxide are evenly mixed, and ball milled at a speed of 400 rpm, and the milling time is 24 hours.

[0082] (3) Put the ball-milled powder in a crucible, put it in a tube furnace, pre-calcine at 700°C for 6h in a nitrogen atmosphere, then raise the temperature at a rate of 10°C / min, and heat up to 1050°C for 4h to obtain Nb 14 W 3 Ti z o (44+2z) Niobium tungsten titanium...

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Abstract

The invention belongs to the technical field of lithium ion battery negative electrode materials, and discloses a niobium-tungsten-titanium oxide negative electrode material and a preparation method and application thereof. A micron-sized niobium-tungsten-titanium oxide is prepared through precursor treatment and nitrogen calcination and serves as a lithium ion battery negative electrode material. The specific discharge capacity of a lithium ion half battery obtained by using the niobium-tungsten-titanium oxide provided by the invention as a working electrode is greater than 200 mAh / g at 0.5 C (1C=150mA / g), the specific discharge capacity reaches 120 mAh / g at 20 C, and the rate capability is excellent; and after 1000 times of circulation under 10 C multiplying power, the specific discharge capacity can still reach 150 mAh / g, and the cycling stability is good. Moreover, due to excellent performance under high magnification, lithium removal and lithium intercalation reactions can be rapidly carried out, so that the niobium-tungsten-titanium oxide negative electrode material has important significance on high-power rapid charging and discharging.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a niobium tungsten titanium oxide negative electrode material and a preparation method and application thereof. Background technique [0002] In recent years, with the development of lithium-ion batteries, electrode materials have been continuously improved. Higher requirements are put forward for the energy density, cycle life and safety of electrode materials. However, the traditional negative electrode materials graphite and lithium titanate have more or less defects. The cycle of graphite is stable, but the capacity has been developed to the limit, and the working voltage of graphite is low, which is easy to form lithium dendrites and cause safety hazards; lithium titanate is known as a zero-strain insertion material, which has good cycle performance and life, but due to Its low ionic conductivity limits its rate capability, which makes it insufficient for our r...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/136H01M10/0525C01G41/00
CPCH01M4/5825H01M4/136H01M10/0525C01G41/006H01M2004/027C01P2006/40Y02E60/10
Inventor 陈胜洲杨伟康建凯罗棋
Owner GUANGZHOU UNIVERSITY
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