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Cathode material precursor and preparation method and purpose thereof

A cathode material and precursor technology, applied in the field of battery materials, can solve the problems of poor electrochemical performance and poor stability of cathode materials, and achieve the effects of enhancing stability, being beneficial to storage, and improving structural stability.

Active Publication Date: 2019-05-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cathode material prepared by the method has poor stability in air and poor electrochemical performance

Method used

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  • Cathode material precursor and preparation method and purpose thereof
  • Cathode material precursor and preparation method and purpose thereof
  • Cathode material precursor and preparation method and purpose thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] A kind of preparation method of cathode material comprises the steps:

[0090] (1) Dilute ferric chloride, manganese chloride, nickel chloride and aluminum chloride by Fe 0.32 mn 0.33 Ni 0.33 Al 0.02 (OH) 2.1 The ratio of the chemical formula is configured to obtain a mixed solution, and the total molar concentration of metal elements in the mixed solution is 1mol / L;

[0091] (2) Add the mixed solution described in step (1) dropwise to the alkaline solution at a speed of 2mL / min, the alkaline solution is a mixed solution of sodium hydroxide and ammonia, the total amount of metal elements in the mixed solution The ratio of the molar weight to the molar weight of hydroxide in the alkaline solution is 1:2.4, wherein the content of sodium hydroxide is 30wt%, the content of ammonia water is 2mol / L, stirred at 800rpm for 2.4h, and then under nitrogen atmosphere, 55 ℃ heating for 3h to obtain the crude precursor of positive electrode material;

[0092] (3) The crude prod...

Embodiment 2

[0095] The difference with Example 1 is that aluminum chloride is replaced by copper chloride in step (1).

Embodiment 3

[0097] The difference from Example 1 is that the heating temperature in step (2) is 50°C.

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Abstract

The invention relates to a cathode material precursor and a preparation method and purpose thereof. A chemical formula of the cathode material precursor is FeaMnbNicMd(OH)x, wherein 0<a<1, 0<b<1, 0<c<1, a+b+c>=0.90, 0.01<d<=0.1, a+b+c+d=1, and 2<x<3; and M includes any one or two types selected form Al, Cu and Co. The interlayer spacing of the cathode material precursor is increased by doping element M, and further the structural stability of the cathode material precursor is improved; and at the same time, the element M is doped so that the cathode material precursor is less sensitive to theair while the material capacity is not reduced, and the battery stability is improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a positive electrode material precursor, its preparation method and application. Background technique [0002] The key material of the secondary battery is the cathode material, and the sodium-ion battery is no exception. The cost of the cathode material is one of the main factors determining the cost of the sodium-ion battery. Transition metal ion layered oxide ternary material is a new type of anode material for sodium ion batteries developed in recent years. It has the advantages of low cost, wide source of raw materials, moderate specific capacity, etc., and has great application potential. Sodium-ion batteries composed of these cathode materials will likely be used in low-end electric vehicles and large-scale energy storage. [0003] Layered NaMnO 2 It is the earliest anode material for sodium-ion batteries studied. Studies have shown that this type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/054
CPCY02E60/10
Inventor 赵君梅李晓伟沈杏刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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