Surface passivating treatment method of spinel type manganese-based positive pole material

A spinel type, cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of reducing the high temperature cycle stability of the material, difficult to control the thickness and uniformity of the coating layer, harmful to the environment and human body, etc. Achieve the effect of improving high temperature cycle performance, non-toxic and harmless human body, and low equipment requirements

Inactive Publication Date: 2012-10-17
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluorination treatment process generally adopts F 2 、NF 3 , ClF 3 Such as strong corrosive and toxic gases for surface treatment, high equipment requirements, harmful to the environment and human body; surface oxide coating generally uses Al 2 o 3 , ZnO, ZrO 2 Coating the positive electrode material with such inert oxides can effectively inhibit the dissolution of Mn in the electrolyte, but it is difficult to control the thickness and uniformity of the coating layer, and the low ionic conductivity of the surface oxide reduces the High temperature cycle stability

Method used

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  • Surface passivating treatment method of spinel type manganese-based positive pole material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] ⑴Weigh 2kg spinel LiNi 0.45 mn 1.45 Cr 0.1 o 4 The positive electrode material powder is placed in the container;

[0021] (2) Add 1000ml of HF solution with a mass fraction of 15% into the container at room temperature to make LiNi 0.45 mn 1.45 Cr 0.1 o 4 Soak the material powder in HF solution, stir continuously for 2 hours to carry out acid treatment, remove easily soluble Ni and Mn plasma on the surface of the material, and filter out the acid-treated LiNi 0.45 mn 1.45 Cr 0.1 o 4 Material;

[0022] (3) Use pure water as the washing liquid, and the LiNi filtered out by suction 0.45 mn 1.45 Cr 0.1 o 4 The material is washed repeatedly until the pH value of the washing solution is between 7-8;

[0023] (4) LiNi filtered out after washing 0.45 mn 1.45 Cr 0.1 o 4 The material was placed in an Ar atmosphere drying oven, and the LiNi 0.45 mn 1.45 Cr 0.1 o 4 The material is dried for 2 hours;

[0024] ⑸Take out the dried LiNi 0.45 mn 1.45 Cr 0.1 o...

Embodiment 2

[0026] ⑴Weigh 2kg spinel LiNi 0.45 mn 1.45 Cr 0.1 o 4 The positive electrode material powder is placed in the container;

[0027] (2) H at room temperature with a mass fraction of 85% 3 PO 4 (PA) solution 1000ml is added in the container, makes LiNi 0.45 mn 1.45 Cr 0.1 o 4 Material powder soaked in H 3 PO 4 (PA) solution, stirring continuously for 4 hours to carry out acid treatment, to remove easily soluble Ni and Mn plasma on the surface of the material, and to filter out the acid-treated LiNi 0.45 mn 1.45 Cr 0.1 o 4 Material;

[0028] (3) Use pure water as the washing liquid, and the LiNi filtered out by suction 0.45 mn 1.45 Cr 0.1 o 4 The material is washed repeatedly until the pH value of the washing solution is between 7-8;

[0029] (4) LiNi filtered out after washing 0.45 mn 1.45 Cr 0.1 o 4 The material was placed in an Ar atmosphere drying oven, and the LiNi 0.45 mn 1.45 Cr 0.1 o 4 The material is dried for 4 hours;

[0030] ⑸Take out the dr...

Embodiment 3

[0032] ⑴Weigh 2kg spinel LiNi 0.45 mn 1.45 Cr 0.1 o 4 The positive electrode material powder is placed in the container;

[0033] (2) H at room temperature with a mass fraction of 85% 3 PO 4 (PA) solution and 500ml of 15% HF solution, mixed thoroughly and added to the container to make LiNi 0.45 mn 1.45 Cr 0.1 o 4 Material powder soaked in H 3 PO 4 In the mixed solution of (PA) and HF, acid treatment was carried out by stirring continuously for 6 hours to remove easily soluble Ni and Mn ions on the surface of the material, and the acid-treated LiNi was filtered out. 0.45 mn 1.45 Cr 0.1 o 4 Material;

[0034] (3) Use pure water as the washing liquid, and the LiNi filtered out by suction 0.45 mn 1.45 Cr 0.1 o 4 The material is washed repeatedly until the pH value of the washing solution is between 7-8;

[0035] (4) LiNi filtered out after washing 0.45 mn 1.45 Cr 0.1 o 4 The material was placed in an Ar atmosphere drying oven, and the LiNi 0.45 mn 1.45 Cr ...

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Abstract

The invention relates to a surface passivating treatment method of a spinel type manganese-based positive pole material, which is characterized by comprising the following steps: (1) soaking spinel type manganese-based positive pole material powder in a strong acid solution to carry out acid treatment; (2) repeatedly cleaning the material subjected to the acid treatment in water until the pH value of water ranges between 7 and 8, then filtering out, and drying; (3) carrying out heat treatment on the dried material, and cooling to obtain the spinel type manganese-based positive pole material subjected to surface passivating treatment. By soaking the spinel type manganese-based positive pole material in the acid solution, Ni ions, Mn ions and other ions which are soluble in the surface of the positive pole material are removed; and through the heat treatment, an even passivation layer is generated on the surface of the positive pole material, thereby effectively preventing the electrolyte from corroding the positive pole material, inhibiting the dissolution of Ni and Mn ions in the positive pole material in the high-temperature cyclic process, and improving the high-temperature cyclic performance of the spinel type manganese-based positive pole material. Besides, the invention has low requirement for equipment, is non-poisonous and harmless to human bodies and is friendly to working environment.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a surface passivation treatment method for spinel-type manganese series positive electrode materials. Background technique [0002] Spinel-type manganese-based cathode materials have become a hotspot in the research and development of lithium-ion battery cathode materials in current industrial production due to their low cost, no pollution, good cycle performance, and high energy density. The dissolution of Ni and Mn ions in the material will cause the deposition of Ni and Mn metals on the surface of the negative electrode material and the poor contact between the positive electrode powder material and the conductive material, causing electrode polarization, resulting in rapid attenuation of lithium-ion battery capacity at high temperatures, and surface modification Technology provides an effective solution to this techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 樊勇利
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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