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Lithium ion battery indium niobium oxide negative electrode material and preparation method thereof

A technology of lithium-ion batteries and niobium oxides, applied in the direction of niobium compounds, battery electrodes, chemical instruments and methods, etc., to achieve the effect of improving rate performance, good cycle stability, excellent cycle stability and rate performance

Pending Publication Date: 2022-06-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore the present invention proposes to adopt solvothermal method to prepare indium-niobium oxide negative electrode material, has not yet seen relevant reports

Method used

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  • Lithium ion battery indium niobium oxide negative electrode material and preparation method thereof
  • Lithium ion battery indium niobium oxide negative electrode material and preparation method thereof
  • Lithium ion battery indium niobium oxide negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Stoichiometric ratio In 0.5 Nb 24.5 O 62 Preparation of anode material:

[0027] Using niobium pentachloride and indium trichloride as raw materials, select polyether F127 as additive, control In x Nb 2-x O 5-x In x=0.04, the preparation stoichiometric ratio In 0.5 Nb 24.5 O 62 negative electrode material. Take 0.004 mol of niobium pentachloride, weigh 0.2 g of polyether, and mix them after they are dissolved completely. The mixed solution was put into a high temperature reaction kettle and put into a constant temperature oven for reaction, the reaction temperature was 200°C, and the reaction time was 24h. After the reaction was completed, the precipitate was taken out, washed with water and absolute ethanol for several times, and then placed in an oven to dry. The dried samples were calcined in a tube furnace in an air atmosphere, the calcination temperature was 1000 °C, the calcination time was 6 h, and the heating rate was 4 °C min -1 , after the heat pres...

Embodiment 2

[0029] Different crystal forms of In 0.5 Nb 24.5 O 62 Preparation of anode material:

[0030] Using niobium pentachloride and indium trichloride as raw materials, select polyether F127 as additive, control In x Nb 2-x O 5-x In x=0.04, the preparation stoichiometric ratio In 0.5 Nb 24.5 O 62 negative electrode material. Take 0.004 mol of niobium pentachloride, weigh 0.2 g of polyether, and mix them after they are dissolved completely. The mixed solution was put into a high temperature reaction kettle and put into a constant temperature oven for reaction, the reaction temperature was 200°C, and the reaction time was 24h. After the reaction was completed, the precipitate was taken out, washed with water and absolute ethanol for several times, and then placed in an oven to dry. The dried samples were calcined in a tube furnace in an air atmosphere. The calcination temperature was 900 °C, the calcination time was 6 h, and the heating rate was 4 °C min. -1 , after the hea...

Embodiment 3

[0032] Cation self-doping In 0.5 Nb 24.5 O 62 Preparation of anode material:

[0033] Using niobium pentachloride and indium trichloride as raw materials, select polyether F127 as additive, control In x Nb 2-x O 5-x In x=0.04, on the basis of Example 1, the excess coefficient of Nb is controlled to be 0.02, and Nb is prepared 5+ Doping In 0.5 Nb 24.5 O 62Anode material, i.e. In 0.5 Nb 24.99 O 63.225 . The rest of the conditions remain the same. The material structure still matches PDF#72-1121 and is monoclinic, as in Figure 5 However, the unit cell parameters and unit cell volume are changed, the localized electronic structure of cations is changed, and the rate performance of the material is improved.

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Abstract

The invention belongs to the technical field of batteries, and discloses an indium-niobium oxide negative electrode material of a lithium ion battery and a preparation method of the indium-niobium oxide negative electrode material. The preparation method comprises the following steps: adding an additive into a niobium source and an indium source which are used as raw materials, and respectively dissolving in proper solvents; after uniformly mixing and stirring, putting the mixture into a high-temperature reaction kettle to carry out solvothermal reaction, washing precipitates for multiple times, and drying to obtain a precursor; and transferring the obtained precursor material into a tubular furnace, calcining in different atmospheres, and cooling along with the furnace to obtain the blocky indium niobium oxide negative electrode material, and the obtained material has excellent rate capability and cycling stability.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and particularly relates to an indium niobium oxide negative electrode material and a preparation method thereof. Background technique [0002] At present, most commercial lithium-ion battery anode materials use graphite. However, the rate performance of graphite is not ideal, and the lithium intercalation potential is relatively low. It is easy to form lithium dendrites during the rapid charge and discharge process, which has serious safety hazards and is difficult to meet the growing development. requirements for it in the energy storage field; Li with a spinel structure 4 Ti 5 O 12 The working voltage is about 1.5V, and there will be no SEI film and lithium dendrites during the charge and discharge process, so the cycle performance of its rate performance is very good, but the lower specific capacity (175mAh g -1 ) limited its development. [...

Claims

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Application Information

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IPC IPC(8): C01G33/00H01M4/48H01M10/0525
CPCC01G33/00H01M4/483H01M10/0525H01M2004/027C01P2006/40
Inventor 苏明如付凯刘璇刘鸿嘉刘云建陈义昌窦爱春周玉胡琴
Owner JIANGSU UNIV
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