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Positive electrode material and preparation method thereof, positive electrode plate and sodium ion battery

A technology for positive electrode materials and positive electrode sheets, applied in the field of positive electrode sheets and sodium ion batteries, positive electrode materials and their preparation, can solve the problems of performance attenuation, material structure damage, and inability to completely solve the problems of water content and moisture absorption in positive electrode materials, and achieve moisture absorption Decreased performance, improved ability to block moisture, and easy-to-achieve effects

Pending Publication Date: 2022-01-11
山东零壹肆先进材料有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the neutral ligand in this method cannot exchange with the water (crystallization water) in the interstitial site. Generally, the water content in the interstitial site is much greater than that in the defect site. This method cannot completely solve the problem of water content and moisture absorption in the positive electrode material.
And the exchanged ligand H 3 CN, NH 3 , CO, C 5 h 5 N is prone to electrochemical oxidation and decomposition at high potential, which may cause damage to the material structure and cause performance attenuation

Method used

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  • Positive electrode material and preparation method thereof, positive electrode plate and sodium ion battery
  • Positive electrode material and preparation method thereof, positive electrode plate and sodium ion battery

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preparation example Construction

[0026] According to another aspect of the present invention, the present invention also relates to a method for preparing a positive electrode material, comprising the following steps:

[0027] Under the condition of heating, the Prussian blue raw material and the alcohol solution of the coating agent are mixed in the non-aqueous liquid phase medium.

[0028] The preparation method of the positive electrode material provided by the present invention can obtain the positive electrode material through simple operation steps, and the prepared positive electrode material has excellent quality and low hygroscopicity.

[0029] Fe(CN) in Prussian blue raw material 6 and (M y M' 1-y )N 6 A three-dimensional framework structure of octahedrons connected by C≡N, alkali metal ions A and interstitial water molecules are located in the three-dimensional channels of the framework structure, the ion content of A in the structure, Fe(CN) 6 The existence of defect concentration, interstitia...

Embodiment 1

[0080] The preparation method of the positive electrode material of the present embodiment comprises the following steps:

[0081] 1. Mix 100 parts of Prussian blue raw material (Na 2 Fe[Fe(CN) 6 ]·H 2 O) dispersed in 100 parts of polyethylene glycol, the heating temperature is 130 ° C;

[0082] 2. Add 0.4 parts of aluminum isopropoxide dropwise under the protection of nitrogen, and stir and age for 10 hours;

[0083] 3. Then filter, dry, and vacuum pack to obtain the positive electrode material.

Embodiment 2

[0085] The preparation method of the positive electrode material of the present embodiment comprises the following steps:

[0086] 1. 100 parts of Prussian blue raw material (KCu[Fe(CN) 6 ]·2H 2 O) be dispersed in 100 parts of mineral oil, heating temperature is 120 ℃;

[0087] 2. Add 2 parts of titanium isopropoxide dropwise under the protection of nitrogen, stir and age for 8 hours;

[0088] 3. Then filter, dry, and vacuum pack to obtain the positive electrode material.

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Abstract

The invention relates to the field of batteries, in particular to a positive electrode material and a preparation method thereof, a positive electrode plate and a sodium ion battery. The positive electrode material is of a core-shell structure, the core of the core-shell structure is a Prussian blue material, and the shell of the core-shell structure comprises at least one of aluminum oxide, titanium dioxide and silicon dioxide. The shell structure of the positive electrode material can well prevent the Prussian blue material from absorbing moisture in air, so that the hygroscopicity of the Prussian blue material is reduced.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a positive electrode material, a preparation method thereof, a positive electrode sheet and a sodium ion battery. Background technique [0002] After the crystal water of the Prussian blue material is completely removed, the crystal structure changes into a rhombohedral crystal system, and the rhombohedral Prussian blue material is easy to absorb water when exposed to air, and is easy to retransform into a monoclinic structure containing crystal water. Therefore, how to reduce the crystal water content of the Prussian blue material and reduce the hygroscopic performance of the Prussian blue material has become a problem to be solved for the positive electrode material of the battery. [0003] In the prior art, the neutral ligand L is used to coordinate the transition metal M to partially or completely replace the coordination water, thereby reducing the water absorption performance of th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054H01M10/42
CPCH01M4/366H01M4/58H01M4/62H01M10/054H01M10/4235H01M2004/028Y02E60/10
Inventor 臧俊罗灏李奇峰张升亮
Owner 山东零壹肆先进材料有限公司
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