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Lithium-ion secondary battery and its composite positive electrode active material and preparation method

A technology for secondary batteries and composite positive electrodes, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems that limit the application of high-performance lithium-ion secondary batteries, the rate performance limitation of lithium-ion secondary batteries, and the electrochemical performance of positive electrode active materials. Poor performance and other problems, to achieve the effect of improving cycle performance and storage performance, good thermal and chemical stability, and high energy density

Active Publication Date: 2017-06-16
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the poor electrochemical performance of phosphate-based positive electrode active materials has severely limited the rate performance of lithium-ion secondary batteries using phosphate-based positive electrode active materials, thereby limiting their development as power batteries in related fields.
[0007] At present, the positive electrode active materials with high electrochemical performance used in power lithium-ion secondary batteries mainly include lithium nickel cobalt manganese oxide (NCM) ternary materials, lithium nickel cobalt aluminum oxide (NCA), etc., although they have high electrochemical performance. Performance, but poor safety performance, which limits the application of high-performance lithium-ion secondary batteries

Method used

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  • Lithium-ion secondary battery and its composite positive electrode active material and preparation method

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preparation example Construction

[0030] According to the preparation method of the composite positive electrode active material of the lithium ion secondary battery of the second aspect of the present invention, it is used to prepare the composite positive electrode active material of the lithium ion secondary battery of the first aspect of the present invention, comprising the steps of: (1) adding the dispersant The primary particles of deionized water and lithium manganese phosphate (LMP) are mixed and ball milled at a volume ratio of 1:1 to 3:1, and then ball milled and dispersed at a speed of 800r / min to 1000r / min for 1h to 2h to obtain lithium manganese phosphate ( Dispersion slurry of primary particles of LMP), wherein the general chemical formula of lithium manganese phosphate (LMP) is LiB y mn 1-y PO 4 , 0≤yx co 1-x o 2 , where, 0≤x<1, A is at least one of Ni, Mn, Al, Mg, Ca, Cr, Zr, Mo, Ag, Nb; (3) the primary particles of lithium manganese phosphate (LMP) Add the dispersion slurry to the dispers...

Embodiment 1

[0056] 1. Preparation of composite cathode active materials for lithium-ion secondary batteries

[0057] (1) The dispersant deionized water and lithium manganese phosphate (LiFe 0.1 mn 0.9 PO 4 ) of the primary particles ( figure 2 ) mixed and milled on a planetary ball mill at a volume ratio of 1:1, and then ball milled and dispersed for 1 hour at a speed of 800r / min to obtain lithium manganese phosphate (LiFe 0.1 mn 0.9 PO 4 ) of the primary particle dispersion slurry, where lithium manganese phosphate (LiFe 0.1 mn 0.9 PO 4 ) The primary particle size is 3nm ~ 10nm, BET specific surface area > 25m 2 / g;

[0058] (2) The dispersant deionized water and lithium cobalt series oxides (LiNi 0.4 co 0.4 mn 0.2 o 2 ) of the secondary particles ( figure 2 ) was mixed and milled on a planetary ball mill at a volume ratio of 1:1, and then ball milled and dispersed for 1 hour at a speed of 200r / min to obtain lithium-cobalt series oxides (LiNi 0.4 co 0.4 mn 0.2 o 2 ) d...

Embodiment 2

[0067] 1. Preparation of composite cathode active materials for lithium-ion secondary batteries

[0068] (1) The dispersant deionized water and lithium manganese phosphate (LiFe 0.3 mn 0.7 PO 4 ) primary particles in a planetary ball mill at a volume ratio of 1.5:1, and then ball milled and dispersed for 2 hours at a speed of 1000r / min to obtain lithium manganese phosphate (LiFe 0.3 mn 0.7 PO 4 ) of the primary particle dispersion slurry, where lithium manganese phosphate (LiFe 0.3 mn 0.7 PO 4 ) The primary particle size is 5nm ~ 12nm, BET specific surface area > 20m 2 / g;

[0069] (2) The dispersant deionized water and lithium cobalt series oxides (LiCoO 2 ) secondary particles were mixed and milled on a planetary ball mill at a volume ratio of 3:1, and then ball milled and dispersed for 3 hours at a speed of 400r / min to obtain lithium cobalt series oxides (LiCoO 2 ) dispersion slurry of secondary particles, in which lithium cobalt series oxides (LiCoO 2 ) The part...

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Abstract

The invention provides a lithium ion secondary battery, a composite positive electrode active material thereof and a preparation method. The composite positive electrode active material is prepared by compositing a lithium cobalt series oxide and lithium manganese phosphate (LMP). The composite positive electrode active material has a filling structure formed by filling and compositing primary particles of LMP in gaps and pits in the surfaces of secondary particles of the lithium cobalt series oxide, wherein the chemical general formula of the lithium cobalt series oxide is LiAxCo<1-x>O2; x is not less than 0 and is less than 1; A is at least one of Ni, Mn, Al, Mg, Ca, Cr, Zr, Mo, Ag and Nb; the chemical general formula of LMP is LiByMn<1-y>PO4; x is not less than 0 and is less than 1; B is at least one of Ni, Co, Fe, Al, Ca, Zn, Mg, Mo, Pb and Zr. The lithium ion secondary battery comprises the composite positive electrode active material. The lithium ion secondary battery has good capacity density, rate performance, cycle performance, storage performance and safety performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium-ion secondary battery, a composite positive electrode active material and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries are widely used in various fields due to their good electrochemical performance, such as mobile phones, computers, power tools, electric vehicles, etc. The safety performance of lithium-ion secondary batteries is the most important performance except electrochemical performance, which determines the safety and reliability of equipment using lithium-ion secondary batteries, and is closely related to the safety of life and property of consumers. [0003] The safety problems of lithium-ion secondary batteries are mainly various forms of thermal runaway problems, such as the fire and explosion of lithium-ion secondary batteries caused by the temperature rise of the internal short circuit point. [0004] Common transit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/525H01M10/0525
CPCY02E60/10
Inventor 来佑磊杨同欢金海族朱凌波陈伟峰
Owner CONTEMPORARY AMPEREX TECH CO
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