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Positive electrode material and preparation method and application thereof

A cathode material and substrate technology, applied in the field of electrochemistry, can solve the problems of aggravated side reactions between cathode active materials and electrolyte, and deterioration of cycle performance

Active Publication Date: 2020-07-07
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the nickel content increases, the direct side reaction between the positive electrode active material and the electrolyte is also significantly intensified, and the cycle performance is significantly deteriorated, which is one of the bottlenecks in mass production and commercialization.

Method used

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  • Positive electrode material and preparation method and application thereof
  • Positive electrode material and preparation method and application thereof
  • Positive electrode material and preparation method and application thereof

Examples

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preparation example Construction

[0029] The second aspect of the present invention provides the preparation method of the positive electrode material provided by the first aspect of the present invention, comprising:

[0030] Provide the substrate;

[0031] A cladding layer is formed on the surface of the substrate.

[0032] The preparation method of the positive electrode material provided by the present invention may include: providing a substrate. The method for providing the base material should be known to those skilled in the art, for example, it may include: mixing and sintering the raw materials of the base material to provide the base material. Those skilled in the art can select appropriate raw materials and proportions of the substrate according to the elemental composition of the substrate. For example, the raw materials of the substrate may include ternary material precursors of nickel, cobalt, manganese and / or aluminum, sources of lithium, sources of M, sources of Me, sources of A, etc., and t...

Embodiment 1

[0062] In the preparation of the above (1) positive electrode material, the specific process is:

[0063] 1) Prepare substrate precursor:

[0064] Nickel sulfate, manganese sulfate, and cobalt sulfate are configured into a solution with a concentration of 1mol / L in a molar ratio of 8:1:1, and a lithium-nickel transition metal oxide A with a larger particle size is prepared by using hydroxide co-precipitation technology. Precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 . In the process of preparing the precursor, the particle size can be controlled by controlling the reaction time, pH value and ammonia concentration during co-precipitation;

[0065] 2) Lithium nickel transition metal oxide A (polycrystalline LiNi 0.8 co 0.1 mn 0.1 o 2 ) preparation method:

[0066] The large-grain nickel-cobalt-manganese ternary material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 , Li-containing compound LiOH·H 2 O is placed in a mixing device for mixing, and then placed in an atmosphere furnace...

Embodiment 2～14

[0068] The preparation method of the positive electrode material of Example 1 is basically the same, the difference is that: the relative content of Ni, Co, Mn, and Al elements in the precursor is different, and substrates with different components are prepared; when adjusting the reaction time and co-precipitation pH value, ammonia concentration, change the size of the primary particle and secondary particle; at the same time, change the material type, coating amount and heat treatment temperature of the coating layer, the specific characteristics of the positive electrode material in the above examples are shown in Table 1, and finally implemented The positive electrode materials in Examples 2-14.

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Abstract

The invention relates to the field of electrochemistry, in particular to a positive electrode material as well as a preparation method and application thereof. The invention provides a positive electrode material, which comprises a base material, the base material comprises secondary particles composed of primary particles, and the surface of the base material is provided with an oxide coating layer. According to the positive electrode material disclosed by the invention, doping and surface coating are carried out in a high-nickel base material; the powder resistivity of the positive electrodematerial is controlled within a proper range; and meanwhile, the specific surface area of the positive electrode active material is reduced, the surface miscellaneous lithium amount is reduced, the polarization problem of the positive electrode material is improved, the direct current impedance of the lithium ion battery is reduced, the side reaction between the positive electrode material and anelectrolyte is effectively reduced, the gas production problem of the battery is inhibited, the volume energy density of the battery is improved, and the cycle performance and the rate capability areoptimized.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a positive electrode 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 mat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M10/42H01M4/48
CPCH01M4/366H01M4/525H01M4/505H01M4/485H01M10/4235H01M4/48Y02E60/10H01M4/62H01M10/0525C01G53/50C01P2002/52C01P2004/84C01P2004/61C01P2004/50C01P2006/12H01M2004/028H01M2004/021
Inventor 杜锐刘勇超王嗣慧赵德宇柳娜
Owner CONTEMPORARY AMPEREX TECH CO
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