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Cathode material of secondary battery and preparation method thereof as well as anode and secondary battery

A cathode material, secondary battery technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve problems such as poor rate characteristics, inability to conduct electrons, and reduce the electronic conductivity of materials

Inactive Publication Date: 2012-07-04
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since these coating layers are mostly non-electrochemically active substances, they cannot effectively conduct electron conduction, thereby reducing the electronic conductivity of the material. The secondary battery prepared by using the positive electrode material with low electronic conductivity has a high charge-discharge ratio under high current. Low capacity, poor rate characteristics

Method used

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  • Cathode material of secondary battery and preparation method thereof as well as anode and secondary battery
  • Cathode material of secondary battery and preparation method thereof as well as anode and secondary battery
  • Cathode material of secondary battery and preparation method thereof as well as anode and secondary battery

Examples

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preparation example Construction

[0032] The present invention also provides a preparation method of positive electrode material, comprising: a) providing Li 1+x mn y Ni z co 1-x-y-z o 2 , where 0<x<0.3, 0.5<y<0.8, 0<z<0.3;

[0033] b) the Li provided in step a) 1+x mn y Ni z co 1-x-y-z o 2 with M 2+ 、PO 4 3- The molar ratio is 1:0.03~0.07:0.03~0.07 dispersed in water to obtain a mixed solution, adjust the pH of the mixed solution to 8~9, filter and dry after stirring for 2~3 hours; wherein M is Fe, Co, Ni, Any one of Mn;

[0034] c) will be with M 2+ Li with a molar ratio of 1:1 + Mix with the solid obtained after drying in step b), and anneal at 450-550°C in air to obtain LiMPO 4 coated on the Li 1+x mn y Ni z co 1-x-y-z o 2 positive electrode material on the surface.

[0035] According to the present invention, first prepare the core material Li 1+x mn y Ni z co 1-x-y-z o 2 , wherein 01+x mn y Ni z co 1-x-y-z o 2 . Among them, the water-soluble nickel salt is preferably NiSO ...

Embodiment 1

[0041] Prepare a 1mol / L aqueous solution with a Ni:Mn:Co:Li molar ratio of 0.18:0.59:0.03:1.2. The aqueous solution is transported into a drying chamber of a compressed air spray dryer through a liquid pump for spray drying to obtain dried powder. The liquid inlet speed of the spray dryer is 400mL / h, the inlet temperature is 240°C, the outlet temperature is 90°C, and the fan frequency is 45MHz. The powder was calcined in air for 2 hours at a temperature of 300°C, then raised to 900°C for 12 hours in air, and finally quenched in liquid nitrogen to obtain a solid solution material Li 1.2 Ni 0.18 mn 0.59 co 0.03 o 2 . figure 1 For the Li1.2Ni prepared in Example 1 0.18 mn 0.59 co 0.03 o 2 Electron microscope image, you can intuitively see Li 1.2 Ni 0.18 mn 0.59 co 0.03 o 2 microstructure.

Embodiment 2

[0043] Prepare a 1mol / L aqueous solution with Ni:Mn:Co:Li molar ratio of 0.25:0.52:0.1:1.13. The aqueous solution is transported into a drying chamber of a compressed air spray dryer through a liquid pump for spray drying to obtain dried powder. The liquid inlet speed of the spray dryer is 400mL / h, the inlet temperature is 240°C, the outlet temperature is 90°C, and the fan frequency is 45MHz. The powder was calcined in air for 2 hours at a temperature of 300°C, then raised to 900°C for 12 hours in air, and finally quenched in liquid nitrogen to obtain a solid solution material Li 1.13 Ni 0.25 co 0.1 mn 0.52 o 2 .

[0044] In order to further illustrate the solution of the present invention, the following are specific examples of the present invention.

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Abstract

The invention provides a cathode material of a secondary battery. The cathode material comprises LiMPO4 and Lil+xMnyNizCo1-x-y-zO2, wherein M is any one of Fe, Co, Ni and Mn, x is more than 0 and less than 0.3, y is more than 0.5 and less than 0.8, and z is more than 0 and less than 0.3; and LiMPO4 is accumulated or dispersed on the surface of the Lil+xMnyNizCo1-x-y-zO2. The cathode material provided by the invention is not reduced in electron conduction rate. The secondary battery prepared from the cathode material has high cyclability and multiplying power property. The invention also provides a preparation method of the cathode material as well as an anode and the secondary battery.

Description

technical field [0001] The invention relates to the field of a secondary battery, in particular to a positive electrode material for a secondary battery, a preparation method thereof, a positive electrode and a secondary battery Background technique [0002] Today, with the depletion of fossil resources, low-carbon and environmentally friendly lifestyles have gradually been recognized by people. The research and development of electric vehicles and hybrid electric vehicles can partially replace internal combustion engine vehicles that consume fossil fuels, which is the main solution to the energy crisis and environmental degradation. One of the methods. Driving power is a key component that affects the popularization and use of electric vehicles. Nowadays, the widely used driving power includes lead-acid batteries, nickel metal hydride / nickel cadmium, lithium ion batteries and other secondary batteries. A secondary battery refers to a battery that can continue to be used by...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/139H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 刘冰贺诗词张茜郑军伟李德成
Owner SUZHOU UNIV
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