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Positive active material with phosphate coated spinel structure as well as preparation method and application of positive active material

A technology of positive active material and spinel structure, applied in the direction of positive electrode, structural parts, active material electrode, etc., can solve the problem of difficult distribution of lattice lithium phosphate

Active Publication Date: 2017-12-29
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for these methods, lithium phosphate is difficult to uniformly distribute on the surface of the cathode material due to the mismatch between lattices.

Method used

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  • Positive active material with phosphate coated spinel structure as well as preparation method and application of positive active material
  • Positive active material with phosphate coated spinel structure as well as preparation method and application of positive active material
  • Positive active material with phosphate coated spinel structure as well as preparation method and application of positive active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] 10.52g of LiMn 2 o 4 Material (particle size is 200nm) joins in 20ml water and stirs constantly, thus obtains LiMn 2 o 4 decentralized system. 10ml concentration of 0.2mol / L FeSO 4 Aqueous solution, 10ml of NH with a concentration of 0.2mol / L 4 h 2 PO 4 The aqueous solution and 10 ml of LiOH aqueous solution with a concentration of 0.6 mol / L were added to the above dispersion system, and kept stirring. The resulting mixture was transferred to a 100ml polytetrafluoroethylene reactor and kept at 180°C for 10 hours. After the reaction, the powder in the product was collected, washed with water for three times, and then washed with absolute ethanol once, and dried at 80° C. for 3 hours to obtain a positive electrode active material.

[0090] figure 1 LiMn is shown 2 o 4 and the XRD fast-scan pattern of the cathode active material prepared in Example 1 at 10° to 80°. From figure 1 It can be seen that LiMn 2 o 4 There is almost no difference from the XRD patter...

Embodiment 2

[0099] 10.52g of LiMn 2 o 4 Material (particle size is 200nm) is added in the water of 20ml and is constantly stirred, thereby obtains LiMn 2 o 4 decentralized system. 10ml of NH with a concentration of 0.2mol / L 4 h 2 PO 4 The aqueous solution and 10 ml of LiOH aqueous solution with a concentration of 0.6 mol / L were added to the above dispersion system, and stirred continuously. The resulting mixture was transferred to a 100ml polytetrafluoroethylene reactor and kept at 180°C for 10 hours. After the reaction, the powder in the product was collected, washed three times with water, then once with absolute ethanol, and dried at 80°C for 3 hours to obtain lithium phosphate and LiMn 2 o 4 mixture.

[0100] Figure 7 A representative SEM image of the cathode material prepared in Example 2 is shown. From Figure 7 It can be seen that without adding FeSO 4 In the case of LiMn 2 o 4 The surface of the material is smooth. However, combined with XRD fast scan and slow sca...

Embodiment 3

[0102] 10.52g of LiMn 2 o 4 Material (particle size is 200nm) joins in 20ml water and stirs constantly, thus obtains LiMn 2 o 4 decentralized system. 10ml concentration of 0.2mol / L FeSO 4 Aqueous solution, 10ml of NH with a concentration of 0.2mol / L 4 h 2 PO 4 The aqueous solution and 10 ml of LiOH aqueous solution with a concentration of 0.6 mol / L were added to the above dispersion system, and stirred continuously. The resulting mixture was transferred to a 100ml polytetrafluoroethylene reactor and kept at 180°C for 10 hours. After the reaction, the powder in the product was collected, washed with water for 3 times, and then with absolute ethanol once, and dried at 80° C. for 3 hours. The dried powder was calcined in air at 450° C. for 3 hours to obtain a positive electrode active material.

[0103] The XRD fast-scan pattern and slow-scan pattern of embodiment 3 show that, after hydrothermal coating and calcination in air, LiMn 2 o 4 The bulk crystal structure of t...

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Abstract

The invention provides a positive active material with a phosphate coated spinel structure. The positive active material contains lithium-containing compound particles which have the spinel structure and the chemical formula LiMn(2-x)AxOy and a phosphate coating layer coating the surfaces of lithium-containing compound particles, in the chemical formula LiMn(2-x)AxOy, A is selected from one or more of Ni, Fe, Co, Ti, Y, Sc, Ru, Cu, Mo, Ge, W, Zr, Ca and Sr, x is larger than or equal to 0 and smaller than or equal to 0.7, and y is larger than or equal to 3.8 and smaller than or equal to 4.2; the lithium-containing compound particles have transition layers, and the transition layers contain dispersion elements which are diffused to enter the lithium-containing compound particles through coating and optional calcination. The invention also provides a preparation method of the positive active material and an application of the positive active material in a lithium ion secondary battery. The positive active material has improved circulation stability and coulombic efficiency when used in the lithium ion secondary battery.

Description

technical field [0001] The invention relates to a positive electrode active material with a phosphate-coated spinel structure, a preparation method and application thereof. Background technique [0002] Compared with other rechargeable battery systems, lithium-ion secondary batteries have the advantages of high working voltage, light weight, small size, no memory effect, low self-discharge rate, long cycle life, and high energy density. They have been widely used in Mobile terminal products such as mobile phones, laptops, and tablets. In recent years, due to environmental protection considerations, electric vehicles have been rapidly developed under the impetus of governments and automobile manufacturers, and lithium-ion secondary batteries have become an ideal power source for new-generation electric vehicles due to their excellent performance . At present, the positive electrode materials of lithium-ion secondary batteries that people pay attention to can be roughly divi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/131H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 武怿达起文斌黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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