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A kind of transition metal oxide material and preparation method thereof

A technology of transition metals and oxides, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve problems such as high cost, insufficient safety and environmental protection, and cumbersome steps, and achieve low cost, good interface stability, and abundant resources Effect

Active Publication Date: 2022-03-15
浙江钠创新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a transition metal oxide material in order to overcome the defects of high cost, cumbersome steps, and insufficient safety and environmental protection of the preparation method of the sodium ion battery layered transition metal oxide material prepared by the molten salt method in the prior art and its preparation method

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  • A kind of transition metal oxide material and preparation method thereof
  • A kind of transition metal oxide material and preparation method thereof
  • A kind of transition metal oxide material and preparation method thereof

Examples

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Embodiment 1

[0097] This embodiment relates to a P2 type layered transition metal oxide material Na 2 / 3 Ni 1 / 3 mn 2 / 3 o 2 The preparation method (molten salt method), comprises the steps:

[0098] (1) Weigh each raw material 0.0102mol according to the stoichiometric ratio (adding 2% more to prevent loss of sodium source in sintering) (sodium carbonate (Na 2 CO 3 ), 0.02mol manganese dioxide (MnO 2 ), 0.01mol nickel hydroxide (Ni(OH) 2 )), and 0.01mol molten salt sodium molybdate (Na 2 MoO 4 );

[0099] (2) The raw materials obtained by weighing are manually mixed in an agate mortar to obtain a solid mixed powder;

[0100] (3) The above solid mixed powder is sintered in a muffle furnace with the following procedure: the temperature is raised from room temperature to 900°C in 174min, maintained for 15h, then lowered to 300°C at 3°C / min, and then naturally cooled to room temperature to obtain molten salt Coated layered transition metal oxide Na 2 / 3 Ni 1 / 3 mn 2 / 3 o 2 product;

...

Embodiment 2

[0104] This embodiment relates to a kind of O3 type layered transition metal oxide material NaNi 1 / 3 mn 1 / 2 Ti 1 / 6 o 2 The preparation method (molten salt method), comprises the steps:

[0105] (1) Weigh raw materials and molten salt sodium molybdate according to the stoichiometric ratio: 0.0153mol (adding 2% more to prevent loss of sodium source in sintering) (sodium carbonate (Na 2 CO 3 ), 0.02mol manganese dioxide (MnO 2 ), 0.01mol nickel hydroxide (Ni(OH) 2 )), 0.005mol nanoscale titanium dioxide (TiO 2 ) and 0.01mol molten salt sodium molybdate (Na 2 MoO 4 );

[0106] (2) After mixing evenly, place it in a muffle furnace for sintering at 1000°C for 10 hours, wash the molten salt with deionized water, and after washing and centrifuging, the filtrate is colorless for the first time, yellow and transparent for the second time, light yellow and transparent for the third time, and light yellow and transparent for the fourth time After washing with ethanol, it is colo...

Embodiment 3

[0108] Example 3Na 0.5 Ni 0.15 co 0.2 mn 0.65 o 2 material preparation

[0109] This embodiment relates to a kind of Na 0.5 Ni 0.15 co 0.2 mn 0.65 o 2 The preparation of materials, the preparation method is as follows:

[0110] (1) Weigh each raw material 0.00752mol according to the stoichiometric ratio (adding 2% more to prevent loss of sodium source in sintering) sodium carbonate (Na 2 CO 3 ), 0.0195mol manganese dioxide (MnO 2 ), 0.0045mol nickel hydroxide (Ni(OH) 2 ), 0.006mol cobalt hydroxide and 0.01mol molten salt sodium molybdate (Na 2 MoO 4 ).

[0111] Subsequent steps are the same as in Example 1.

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Abstract

The invention discloses a transition metal oxide material and a preparation method thereof. The preparation method of the transition metal oxide material provided by the present invention comprises the following steps: under the condition of molten salt melting, the mixture of the sodium source and the transition metal source containing oxygen is sintered at high temperature to prepare the transition metal oxide material Na x MeO 2 The temperature of the high-temperature sintering is 700-1000°C, and the time of the high-temperature sintering is 10-15h; the molten salt is sodium molybdate; the sodium source is selected from sodium carbonate and / or sodium hydroxide; wherein, Me is selected from one or more transition metal elements. The preparation method of the transition metal oxide material of the present invention is simple, low in production cost, non-toxic and harmless, short in time and low in energy consumption, and the prepared material is single crystal particles with high crystallinity, good interface stability, and reduced side reactions As a positive electrode material for sodium ion batteries, it has high battery capacity and good cycle stability.

Description

technical field [0001] The invention relates to a transition metal oxide material and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, people's dependence on power resources in daily life has greatly increased. Therefore, large-scale energy storage equipment is very important, and sodium-ion battery technology, which is environmentally friendly, rich in resources, and low in cost, is expected to become the mainstay of future energy storage applications. [0003] However, there are many challenges in sodium-ion batteries, and the most critical thing at present is to find high-capacity and stable electrode materials. layered transition metal oxide Na x MeO 2 (Me is a transition metal) has a layered structure (mainly P2 and O3 types), each unit cell of the transition metal oxide is octahedral, and its shared edge sheets form an oxygen layer, and the larger interlayer spacing is conducive to sodium ions Interca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/054
CPCC01G53/44H01M4/505H01M4/525H01M10/054H01M2004/028C01P2004/03C01P2002/72C01P2006/40Y02E60/10
Inventor 姜美丹廖小珍李林森钱冠男马紫峰
Owner 浙江钠创新能源有限公司