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Positive electrode material precursor, positive electrode material, preparation method of positive electrode material and lithium ion battery

A technology of positive electrode materials and precursors, applied in the direction of battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of cumbersome preparation process and limit the development of lithium-ion batteries, and achieve simple manufacturing process, convenient for large-scale production, crystal good effect

Pending Publication Date: 2022-08-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology

However, the preparation process of the above-mentioned method is cumbersome in the preparation of the precursor, which limits its further development in lithium-ion batteries.

Method used

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  • Positive electrode material precursor, positive electrode material, preparation method of positive electrode material and lithium ion battery
  • Positive electrode material precursor, positive electrode material, preparation method of positive electrode material and lithium ion battery
  • Positive electrode material precursor, positive electrode material, preparation method of positive electrode material and lithium ion battery

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preparation example Construction

[0039] The present invention also provides a preparation method of the above-mentioned positive electrode material, comprising the following steps:

[0040] The lithium source and the positive electrode material precursor are mixed and then sintered at high temperature to obtain a sintered product;

[0041] The sintered product is annealed, and then ground and sieved to obtain a positive electrode material.

[0042] In the present invention, firstly, the lithium source and the positive electrode material precursor are mixed and then sintered at high temperature to obtain a sintered product.

[0043] In the present invention, the lithium source and the positive electrode material precursor are mixed and placed in a heating device. In the present invention, the heating device is preferably a tube furnace.

[0044] Then, high-temperature sintering is performed in an oxygen or air atmosphere. In the present invention, the high temperature sintering process is divided into two st...

Embodiment 1

[0057] Example 1 Preparation of lithium cobalt oxide layered cathode material

[0058] The cobalt metal elemental powder (particle size is 1 micron) and lithium hydroxide monohydrate are fully mixed according to the molar ratio of 1:1.05, and the mixed powder is placed in a tube furnace, first in an oxygen atmosphere at a rate of 3 °C / min Heating to 500°C for pre-sintering and holding for 5h; then heating to 850°C at a rate of 5°C / min and holding for 10h. After natural annealing in the tube furnace, take out the lithium cobalt oxide cathode material and grind it. After grinding, sieve through a 300-mesh sieve. The sieved lithium cobalt oxide powder is the final product. See Figure 1a , Figure 1a It is a scanning electron microscope picture of the lithium cobalt oxide layered positive electrode material prepared in Example 1. see Figure 1c , Figure 1c It is the xrd pattern of the lithium cobalt oxide layered positive electrode material prepared in Example 1.

[0059] The...

Embodiment 2

[0060] Example 2 Preparation of lithium cobalt oxide layered cathode material

[0061] The cobalt metal elemental powder (particle size is 1 micron) and lithium hydroxide monohydrate are fully mixed according to the molar ratio of 1:1.05, and the mixed powder is placed in a tube furnace, first in an oxygen atmosphere at a rate of 3 °C / min Heating to 500°C for pre-sintering and holding for 5h; then heating to 900°C at a rate of 5°C / min and holding for 10h. After natural annealing in the tube furnace, the lithium cobalt oxide cathode material is taken out and ground. After grinding, it is sieved through a 300-mesh sieve, and the sieved lithium cobalt oxide powder is the final product.

[0062] The above product was mixed with PVDF and carbon black in a ratio of 8:1:1 respectively. The total mass of the mixture was 1 g. After adding 2.3 g of N-methylpyrrolidone, it was fully stirred to obtain a uniform slurry, and the slurry was coated on aluminum foil. After drying, cut the pie...

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Abstract

The invention provides a positive electrode material precursor, the positive electrode material precursor is a transition metal simple substance or a transition metal alloy, the transition metal simple substance is selected from one or more of Ni, Co and Mn, and the transition metal alloy is selected from one or more of a NiCo alloy, a NiMn alloy and a NiCoMn alloy. The transition metal (Ni, Co and Mn) powder or the alloy powder thereof is directly used as the positive electrode material precursor and is mixed with the lithium source for sintering, and the prepared positive electrode material is good in crystal and has relatively good electrochemical performance. In addition, the positive electrode material prepared by the method has the advantages of high tap density, simple manufacturing process, environmental friendliness, low cost and convenience in large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive electrode material precursor, a positive electrode material and a preparation method thereof, and a lithium ion battery. Background technique [0002] Under the multiple pressures of global resource shortage, environmental pollution, and the active call of the national dual-carbon strategy, the development of green and environmentally friendly new energy sources has become of great significance. As we all know, lithium-ion battery technology, as a new energy storage technology, is widely used in many fields, such as automobiles, energy storage, 3C fields, etc. Due to the advantages of high operating voltage and high energy density of lithium-ion batteries, lithium-ion batteries and their materials have great research value. [0003] Since the cathode material occupies an important position in the cost of lithium-ion batteries, using more econo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M4/52H01M10/0525
CPCC01G51/42H01M4/52H01M10/0525C01P2002/72C01P2004/03C01P2006/40C01P2006/11Y02E60/10
Inventor 夏永高曹龙昊刘来好
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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