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Cathode material and preparation method and application thereof

A cathode material and substrate technology, applied in the field of electrochemistry, can solve problems such as gaps in market demand, and achieve the effects of low Li/Ni mixing degree, strong crystal structure stability, and long cycle life

Active Publication Date: 2020-12-29
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These three methods can improve the cycle performance to a certain extent, but there is still a gap with the market demand

Method used

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  • Cathode material and preparation method and application thereof
  • Cathode material and preparation method and application thereof
  • Cathode material and preparation method and application thereof

Examples

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preparation example Construction

[0033] The second aspect of the present invention provides the preparation method of the positive electrode material, comprising: mixing and sintering raw materials of the substrate to provide the substrate. Those skilled in the art can control the degree of oxygen deficiency in the ternary material by adjusting processes related to oxygen combination such as precursor preparation process and powder sintering process. Specifically, the positive electrode material provided by the first aspect of the present invention is provided by adjusting the speed, temperature, and pH of the stirring process during the precursor synthesis process, and the sintering temperature, sintering time, and oxygen flow rate during the sintering process. The raw materials needed to prepare the base material should be known to those skilled in the art. For example, the raw materials of the base material may include nickel-cobalt-manganese and / or aluminum ternary material precursors, lithium sources, M ...

Embodiment 1

[0045] Preparation of cathode material:

[0046] Step 1: Prepare the substrate precursor, configure nickel sulfate, manganese sulfate, and cobalt sulfate in a molar ratio of 8:1:1 to form an aqueous solution with a concentration of 1mol / L. Under the condition of 11, stir for 6 hours, age at room temperature for 12 hours, filter and wash to prepare the precursor Ni of the transition metal oxide with a thickness of 9 μm to 11 μm 0.8 co 0.1 mn 0.1 (OH) 2 .

[0047] Step 2: the substrate precursor Ni obtained in step 1 0.8 co 0.1 mn 0.1 (OH) 2 1. Lithium hydroxide is placed in a high-speed mixer for mixing, the molar ratio of the substrate precursor to lithium hydroxide is 1.05, and then the mixture is placed in an oxygen atmosphere furnace (30% oxygen content) for sintering at 910°C for 10h, At the same time, the crushing treatment of the airflow is carried out, that is, the positive electrode material substrate with a single crystal structure is obtained;

[0048] Step ...

Embodiment 2

[0050] The difference from Example 1 lies in that 0.2wt% zirconia is added in step 2, and the sintering temperature is set to 900°C.

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Abstract

The invention relates to the field of electrochemistry, particularly relates to a long-life positive electrode material as well as a preparation method and application thereof. The invention providesa long-life positive electrode material which comprises a matrix, the general formula of the matrix is LixNiyCozMkMepOrAm, 0.95 < / = x < / = 1.05, 0.5 < / = y < / = 1, 0 < / = z < / = 1, 0 < / = k < / = 1, 0 < / = p < / = 0.1, 1 < / = r < / = 52, 0 < / = m < / = 2 and m+r < / = 2; the oxygen defect degree of the positive electrode material satisfies at least one of condition (1) or condition (2), (1) 1.77 < / = OD1 < / = 1.90; and (2) OD2 is more than or equal to 0.69 and less than or equal to 0.74. According to the method, the positive electrode material has relatively strong crystal structure stability and relatively low Li / Ni mixed arrangement degree, the battery using the positive electrode material has relatively high energy density and long cycle life, and meanwhile, a gas production problem in the cycle process iseffectively inhibited.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a long-life anode material and its preparation method and application. Background technique [0002] With the escalation of energy crisis and environmental problems, the development of new green energy is imminent. Lithium-ion batteries have the advantages of high specific energy, wide application temperature range, low self-discharge rate, long cycle life, good safety performance, and no pollution, and have been used in various fields. Lithium-ion batteries have been gradually tried all over the world as the energy system of automobiles to replace traditional internal combustion locomotives. However, the commonly used lithium iron phosphate (LiFePO 4 ), low nickel ternary (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ), etc., due to the limitations of the nature of the material itself, it cannot fully meet the energy density requirements of the power battery for the positive electrode materi...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/38H01M10/0525H01M4/36H01M4/66
CPCH01M4/485H01M4/505H01M4/525H01M4/38H01M10/0525H01M4/366H01M4/667Y02E60/10H01M4/131H01M4/62C01G53/50C01G53/006C01P2006/40C01P2004/50C01P2004/51C01P2004/61C01P2002/72C01P2002/74C01P2002/54C01P2002/52H01M2004/028
Inventor 沈重亨杜锐刘勇超赵德宇柳娜
Owner CONTEMPORARY AMPEREX TECH CO
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