High-voltage composite positive electrode material and lithium ion battery containing same

A composite cathode material, lithium ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor thermal stability and safety performance, low energy density system, poor low temperature performance of lithium iron phosphate, etc. Good cycle performance and safety performance, improved charge cut-off voltage, and high volumetric energy density

Inactive Publication Date: 2021-03-26
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above cathode materials have some inherent disadvantages. For example, although lithium cobalt oxide is the main material of the high energy density system, it is limited by cobalt resources, the cost is high, and it is thermally stable under the high voltage system. Poor performance and safety performance, while ternary materials such as lithium iron phosphate have low compaction density and low voltage platform, so the applicable energy density system is low, and lithium iron phosphate has the disadvantage of poor low temperature performance, while lithium manganese oxide has the disadvantage of high te

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  • High-voltage composite positive electrode material and lithium ion battery containing same
  • High-voltage composite positive electrode material and lithium ion battery containing same

Examples

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Embodiment 1

[0044] A composite positive electrode material for a high-voltage lithium-ion battery, comprising a base material C and a lithium zirconium phosphate fast ion conductor, the base material C is formed by mechanically and physically mixing material A and material B, and the mass ratio of material A to material B is 8 :2;

[0045] Among them, material A is Li 1.03 co 0.98 Ti 0.005 al 0.01 Y 0.005 o 2 , the morphology is single crystal particles, the median value D 50 is 17.5 μm, material A is prepared by gradation of particle size, and small particle D 50 4μm, large particle D 50 It is 18μm, and the mass ratio of size and particle is 8:2;

[0046] Among them, material B is Li 1.04 (Ni 0.5 co 0.2 mn 0.3 ) 0.99 Sr 0.005 al 0.005 o 2 , the morphology is single crystal particles, the median value D 50 5 μm;

[0047] The above matrix material C with 500ppm LiZr 2 (PO 4 ) 3 After physical mixing, put it in a muffle furnace, heat it to 650°C for 3 hours at a heating...

Embodiment 2

[0052] A composite positive electrode material for a high-voltage lithium-ion battery, comprising a base material C and a lithium zirconium phosphate fast ion conductor, the base material C is formed by mechanically and physically mixing material A and material B, and the mass ratio of material A to material B is 7 :3;

[0053] Among them, material A is Li 1.03 co 0.98 Ni 0.005 al 0.01 mn 0.005 o 2 , the morphology is single crystal particles, the median value D 50 is 17.5 μm, material A is prepared by gradation of particle size, and small particle D 50 4μm, large particle D 50 It is 18.5 μm, and the mass ratio of size and particle is 8:2;

[0054] Among them, material B is Li 1.04 (Ni 0.5 co 0.2 mn 0.3 ) 0.985 Sr 0.005 al 0.005 Y 0.005 o 2 , the morphology is single crystal particles, the median value D 50 5 μm;

[0055] The above matrix material C with 800ppm LiZr 2 (PO 4 ) 3 After physical mixing, put it in a muffle furnace, heat it to 650°C for 3 hour...

Embodiment 3

[0060] A composite positive electrode material for a high-voltage lithium-ion battery, comprising a base material C and a lithium zirconium phosphate fast ion conductor, the base material C is formed by mechanically and physically mixing material A and material B, and the mass ratio of material A to material B is 6 :4;

[0061] Among them, material A is Li 1.03 co 0.98 Mg 0.005 al 0.01 Ti 0.005 o 2 , the morphology is single crystal particles, the median value D 50 is 17.5 μm, material A is prepared by gradation of particle size, and small particle D 50 4μm, large particle D 50 18μm, the mass ratio of size and particle is 8:2;

[0062] Among them, material B is Li 1.04 (Ni 0.5 co 0.2 mn 0.3 ) 0.99 Sr 0.005 al 0.005 o 2 , the morphology is single crystal particles, the median value D 50 5 μm;

[0063] The above matrix material C with 1200ppm LiZr 2 (PO 4 ) 3 After physical mixing, put it in a muffle furnace, heat it to 650°C for 3 hours at a heating rate of...

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Abstract

The present invention provides a high-voltage composite positive electrode material and a lithium ion battery containing the same, the positive electrode material has a core-shell structure, a lithiumzirconium phosphate fast ion conductor is used as a shell layer material, lithium cobalt oxide and a 523 ternary material are used as core materials, and a mass ratio of the lithium cobalt oxide to the 523 ternary material is (19): 1. The lithium zirconium phosphate has excellent stability and excellent lithium ion transmission performance, and is coated on the surface of a composite positive electrode material to effectively avoid direct contact with an electrolyte, so that the side reaction between a positive electrode and the electrolyte is reduced, and the lithium ion transmission rate can be increased; and a composite material formed by mechanically and physically mixing lithium cobalt oxide with specific composition and particle size and the ternary material with specific composition and particle size is used as a matrix, and then is physically mixed with a lithium zirconium phosphate solid phase to be quickly sintered on the surface of a composite positive electrode material ata low temperature to form a coating layer; finally, the high-voltage composite positive electrode material coated with the lithium zirconium phosphate fast ion conductor is obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-voltage composite positive electrode material and a lithium ion battery containing the material. Background technique [0002] Lithium-ion batteries have high energy density, high working voltage, environmental friendliness, and strong manufacturability, and are currently widely used in mobile phones, notebook computers, electric vehicles, and energy storage fields. The rapid development of lithium-ion batteries is of great significance for solving the energy crisis and improving environmental pollution. Among them, the cathode material plays a key role in the electrochemical performance, safety performance and manufacturing cost of the lithium-ion battery. It can be said that the cathode material is a key factor restricting the development of lithium-ion batteries. At present, the commonly used cathode materials for lithium-ion batteries mainly ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 于丽秋李素丽曾家江樊亚楠李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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