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Multiphase rubidium titanate functional ceramic material and preparation method thereof

A technology of functional ceramics and multiphase ceramics is applied in the field of multiphase rubidium titanate functional ceramic materials and their preparation to achieve the effects of low cost, long cycle life and high safety

Active Publication Date: 2021-03-26
广州拓新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, dielectric capacitors must solve the problem of making the existing giant dielectric constant (ε’≈10 4 ~10 5 Level) and then increase several orders of magnitude and other major issues, so as to greatly increase the energy storage density, it is possible to truly challenge and subvert the current dominant position of lithium batteries

Method used

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  • Multiphase rubidium titanate functional ceramic material and preparation method thereof
  • Multiphase rubidium titanate functional ceramic material and preparation method thereof
  • Multiphase rubidium titanate functional ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of multiphase rubidium titanate functional ceramic powder by mechanical-chemical synthesis + solid-phase firing method

[0036] Step 1. Dry fine precursor preparation

[0037] According to Rb 2 Ti n O 2n+1 (here, n=2) with a stoichiometric molar ratio Ti:Rb≈n:2, weigh an appropriate amount of dry titanium dioxide (TiO 2 ) and rubidium carbonate (Rb 2 CO 3 ) powder is used as titanium source and rubidium source, and the actual ratio deviation of the two is controlled within ±5%, and then the two are initially mixed and then crushed and mixed by a vibrating mill in a mechanical-chemical manner for 30 minutes.

[0038] figure 1 The thermogravimetric TG curve of the precursor powder obtained by the above method is compared with the thermogravimetric TG curve of the control product obtained by hand grinding and mixing for 30 minutes only. It can be seen from the figure that the temperature of starting pyrolysis and weight loss of the precursor powder obta...

Embodiment 2

[0046] Preparation of multi-phase rubidium titanate functional ceramic powder by liquid-phase synthesis and solid-phase firing

[0047] Step 1. Dry fine precursor preparation

[0048] According to Rb 2 Ti n O 2n+1 (here, n=4) with a stoichiometric molar ratio Ti:Rb≈n:2, weigh an appropriate amount of dry titanium dioxide (TiO 2 ) and rubidium carbonate (Rb 2 CO 3 ) powder is used as titanium source and rubidium source, and the actual ratio deviation of the two is controlled within ±5%, and then placed in the flask and then added with deionized water 4 times the weight of titanium dioxide to mix evenly; use an evaporator to concentrate, dry and solidify, The powder obtained by grinding is the precursor.

[0049] Step 2. Ceramic powder firing

[0050] Take an appropriate amount of the precursor powder obtained by the above steps, put it into a crucible and place it in a heat treatment furnace, and burn it in the air at 870° C. for 1.5 hours.

[0051] When cooled to near ...

Embodiment 3

[0056] Preparation of multi-phase rubidium titanate functional ceramic powder by solid-phase mixing + firing method

[0057] Step 1. Precursor Preparation

[0058] Titanium oxide (TiO 2 ) and rubidium carbonate (Rb 2 CO 3 ) The powders are titanium source and rubidium source, respectively bake at 100℃ for 24 hours to make them completely dehydrated, take n=3 and according to Rb 2 Ti n O 2n+1 The stoichiometric molar ratio of Ti:Rb≈n:2 is to weigh an appropriate amount of titanium source and rubidium source (the actual ratio deviation of the two is controlled within ±5%), put them in an agate mortar and grind for 20 minutes, and the obtained powder is reused A 10-ton press was pressed for 5 minutes to obtain a precursor.

[0059] Step 2. Preparation of ceramic powder

[0060] The particles thus generated are placed in a platinum crucible and placed in a heat treatment furnace, and heat treated in the air according to the following procedure: raise the temperature to 315°...

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Abstract

The invention provides a complex-phase rubidium titanate functional ceramic material. The complex-phase rubidium titanate functional ceramic material comprises the following components: an n-rubidiumtitanate phase with a molecular formula of Rb<2>Ti<n>O<2n+1>, a titanium dioxide phase with a molecular formula of TiO<2>, and a small amount of doping elements added for improving or adjusting the performance of the ceramic material. The functional ceramic material is prepared by fully and uniformly mixing a rubidium source, a titanium source and doping elements to obtain high-activity fine precursor powder and then firing the precursor powder. The material has unusual characteristics in the aspects of electricity, electrochemistry and the like; for example, a huge dielectric constant up to the level of 10<9> at normal temperature accompanies relatively low dielectric loss, excellent insulativity accompanies 10<-3> S / cm-level ionic conductivity and the like; and the material has wide application prospects in the fields of high-energy-density rechargeable energy storage devices, semiconductor devices, catalytic purification and the like.

Description

technical field [0001] The invention belongs to the field of new energy materials and electric energy storage systems, in particular to a class of complex-phase rubidium titanate functional ceramic materials with unusual electrical and electrochemical properties and a preparation method thereof. Background technique [0002] Today's human beings are inseparable from rechargeable energy storage devices, such as mobile phones, portable computers, electric vehicles, remote controls, wearable smart devices, etc., which all use them. Its types mainly include: electrochemical cells, dielectric energy storage capacitors and the mixture of the former two, as well as inductive electric energy storage devices that have not been practically used in technology. [0003] Electrochemical batteries are represented by the widely used lithium-ion batteries, and their energy density (volume and weight specific energy) is higher than other power storage devices, reaching the level of 250-700Wh...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/462C04B35/46
CPCC04B35/62675C04B35/462C04B35/46C04B2235/3201C04B2235/3232Y02E60/13C04B2235/80C04B2235/3225C04B2235/3251C04B2235/3286C04B2235/3298C04B2235/3203C04B2235/3275C04B2235/6562C04B2235/6567C04B2235/6565C04B2235/6583C04B2235/96
Inventor 黄向东裴锋黄思睿胡志鹏王卓
Owner 广州拓新能源科技有限公司
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