Coating-structure sodium-ion battery anode material as well as preparation method and application thereof

A sodium-ion battery and positive electrode material technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of process difficulty, increased material cost, difficulty in comprehensive coating, uneven coating, etc., and achieve improved cycle stability , good coating effect and simple coating process

Active Publication Date: 2019-03-26
BEIJING HINA BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid-phase method faces the problem of uneven coating, and it is difficult to achieve comprehensive coating; while the liquid-phase method brings waste liquid problems, and the difficulty of drying process increases the cost of materials, so the coating method needs to be improved

Method used

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  • Coating-structure sodium-ion battery anode material as well as preparation method and application thereof
  • Coating-structure sodium-ion battery anode material as well as preparation method and application thereof
  • Coating-structure sodium-ion battery anode material as well as preparation method and application thereof

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preparation example Construction

[0047] The above materials can be obtained through the following figure 1 In the method shown, the gas is passed into the coating liquid, and the coating liquid is carried into the atmosphere furnace, so that the coating precursor is thermally decomposed, and the positive electrode material is coated. Its specific preparation method can be as follows figure 2 As shown in the flow chart shown, it specifically includes the following steps:

[0048] Step 110, selecting / preparing a coating solution;

[0049] Specifically, the coating solution includes a coating precursor composed of metal salts and / or hydrates thereof, wherein the metal salts and / or hydrates thereof are preferably nitric acid of Al, Mg, Ti, Zn, Zr, Nb or La One or more of salts and their hydrates, sulfates and their hydrates, and organic salts;

[0050] In this step, the liquid-coated precursor can be directly used as the coating liquid, or the solid raw material of the precursor can be dissolved in a correspo...

Embodiment 2

[0060] First, choose the positive electrode material as Na 0.9 Cu 0.22 Fe 0.30 mn 0.48 o 2 , which is recorded as raw material 1, and its particle size D50 is 10 μm. The coating liquid is composed of aluminum nitrate and water, the concentration is 50g aluminum nitrate / 100g water, the gas is selected as compressed air, and the furnace is selected as rotary furnace.

[0061] Then, 100kg of positive electrode material was weighed and placed in a rotary furnace, and the rotation was turned on to increase its contact area. Turn on the heating to make the temperature in the furnace reach 700 degrees Celsius. Turn on the compressed air, which carries the coating liquid into the furnace body, and the coating liquid contacts the material and decomposes into Al at high temperature 2 o 3 , evenly covering the surface of the material. The 700-degree heat preservation time is set to 8 hours, and the ventilation is stopped after the time is up. Turn on the cooling system, the furn...

Embodiment 3

[0066] First, choose the positive electrode material as Na 1.0 Ni 0.22 Cu 0.11 Fe 0.33 mn 0.33 o 2 , which is recorded as raw material 2, and its particle size D50 is 10 μm. The coating liquid is tetrabutyl titanate, the gas is nitrogen, and the furnace is a rotary furnace.

[0067] Then, 100kg of positive electrode material was weighed and placed in a rotary furnace, and the rotation was turned on to increase its contact area. Turn on the heating to make the temperature in the furnace reach 900 degrees Celsius. Turn on the compressed air, which carries the coating liquid into the furnace body, and the coating liquid contacts the material and decomposes into TiO at high temperature 2 , evenly covering the surface of the material. The 900-degree heat preservation time is set to 4 hours, and the ventilation is stopped after the time is up. Turn on the cooling system, the furnace body cools down rapidly, and TiO can be obtained after taking it out 2 Coated Na 1.0 Ni 0...

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Abstract

The invention discloses a coating-structure sodium-ion battery anode material as well as a reparation method and application thereof. The method comprises the following steps: selecting/preparing coating liquid, wherein the coating liquid contains coated precursor formed by metal salt and/or hydrate of the metal salt; putting a to-be-coated anode material into a coating furnace, heating to 200-1000 DEG C, introducing the coating liquid into the coating furnace through compressed air or nitrogen or argon, heating to decompose the coated precursor into oxide uniformly coating the surface of theanode material; and taking out the prepared anode material with an oxide coating layer, so as to obtain the coating-structure sodium-ion battery anode material.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a sodium-ion battery positive electrode material with a coating structure and a preparation method and application thereof. Background technique [0002] Energy is the foundation of social development. Secondary batteries have played an important role in the development of human society. Lithium-ion batteries have been widely used because of their high energy density and high power density. Today, the large-scale application of lithium-ion batteries has exposed the shortage of lithium resources and their commonly used transition metal resources. Lithium resources are scarce resources, and the global distribution is extremely uneven. It is a strategic resource similar to oil. Based on the characteristics of rich sodium resources, working principle and processing technology consistent with lithium-ion batteries, sodium-ion batteries are considered to be a benefic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/628H01M10/054Y02E60/10
Inventor 戚兴国周文泽秦东唐堃胡勇胜
Owner BEIJING HINA BATTERY TECH CO LTD
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