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

A technology for lithium-ion batteries and cathode materials, applied in the field of cathode materials for lithium-ion batteries and its preparation, can solve the problems of lack of mutual support and inability to effectively inhibit the growth of internal cracks, and achieve improved cycle performance and increased radial distribution ratio Effect

Pending Publication Date: 2022-06-24
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low temperature of the secondary coating, it can only protect the surface of the particles, and the lack of mutual support between the internal primary particles cannot effectively inhibit the growth of internal cracks during the cycle.

Method used

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

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preparation example Construction

[0030] (1) In the preparation method of the positive electrode material provided by the present invention, through two synthesis, unsteady growth in the synthesis process of the precursor is made, and in the second synthesis and growth process, it is more favorable for the primary grains inside the precursor to be radially oriented growth, can prepare a precursor with an aspect ratio of the primary crystal grains inside the precursor ≥ 1.5, and the radial distribution ratio of the primary crystal grains inside the precursor ≥ 30%, so that when the precursor reacts with the lithium source, The high reactivity is conducive to the diffusion of lithium and the diffusion of additives during the sintering process; in addition, the addition of specific additives can facilitate the growth of primary grains along the (003) crystal plane, combined with specific precursor structures, the resulting positive electrode material has internal The primary crystal grains are distributed radially...

Embodiment 1

[0091] This example is to illustrate the positive electrode material with a divergent structure prepared by the preparation method of the present invention.

[0092] (1) Dissolve nickel sulfate, cobalt sulfate and manganese sulfate in pure water according to the metal molar ratio of 88:9:3 to obtain a mixed salt solution L of 2.0mol / L 1 , prepare the ammonia solution of 4mol / L as complexing agent, and the sodium hydroxide solution of 8mol / L as precipitating agent;

[0093] (2) Precursor crystal nucleus preparation: ammonia solution and sodium hydroxide solution are first added to the reactor with stirring in parallel, wherein, the pure water of 25% liquid level is placed in the reactor to obtain the first mixed solution, Wherein, based on the total volume of the reaction kettle, the amount of the first mixed solution is 20%, and the pH value of the first mixed solution is adjusted to 13.2;

[0094] Under the protection of nitrogen atmosphere, the mixed salt solution L 1 Add ...

Embodiment 2

[0106] This example is to illustrate the positive electrode material with a divergent structure prepared by the preparation method of the present invention.

[0107] (1) Dissolve nickel sulfate, cobalt sulfate and manganese sulfate in pure water according to the metal molar ratio of 83:11:6 to obtain a mixed salt solution L of 2.0mol / L 2 , prepare the ammonia solution of 4mol / L as complexing agent, and the sodium hydroxide solution of 8mol / L as precipitating agent;

[0108] (2) preparation of precursor crystal nucleus: ammonia aqueous solution and sodium hydroxide solution are first added to the reactor with stirring, wherein, the pure water of 25% liquid level is placed in the reactor to obtain the first mixed solution, Wherein, based on the total volume of the reaction kettle, the amount of the first mixed solution is 25%, and the pH value of the first mixed solution is adjusted to 11.6;

[0109] Under the protection of nitrogen atmosphere, the mixed salt solution L 2 The ...

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Abstract

The invention relates to the technical field of secondary batteries, and discloses a positive electrode material for a lithium ion battery, a preparation method of the positive electrode material and the lithium ion battery. The positive electrode material comprises a high-nickel multi-element positive electrode material, the high-nickel multi-element positive electrode material is formed by agglomeration of a plurality of primary crystal grains, and the primary crystal grains are distributed in a divergent manner along the diameter direction of the high-nickel multi-element positive electrode material; wherein the length-diameter ratio L / R of the primary crystal grains in the positive electrode material is greater than or equal to 3, and the radial distribution proportion of the primary crystal grains in the positive electrode material is greater than or equal to 60%. The lithium ion battery containing the positive electrode material is high in capacity, the particle strength is greatly improved, and the battery capacity is high.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode material for lithium ion batteries, a preparation method thereof, and a lithium ion battery. Background technique [0002] High nickel ternary cathode material LiNi for lithium ion battery 1-x-y Co x M y O 2 (where M=Mn and / or Al), due to the advantages of high mass specific capacity and volume specific capacity, it has been widely studied and applied in power batteries, power tools and energy storage in recent years. Among them, the biggest defect of the high-nickel ternary cathode material is that there are many phase changes in the crystal structure during the charging and discharging process, and the volume change caused by the phase transition leads to particle pulverization. [0003] In order to overcome this shortcoming, CN109713297A discloses a high-nickel positive electrode material with directional arrangement of primary particles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525C01G53/50C01P2004/03C01P2004/61C01G53/00Y02E60/10C01G53/42C01P2002/52C01P2004/50C01P2004/84H01M4/36H01M4/131H01M4/1391H01M10/052H01M4/0471H01M2004/028H01M2004/021H01M4/366C01P2004/54C01P2004/62C01P2004/64C01P2004/86C01P2006/40
Inventor 侯雪原王竞鹏张学全刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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