Cathode active material and preparation method thereof, and application thereof in lithium ion secondary battery

A positive electrode active material and active material technology, applied in high-voltage lithium cobalt oxide positive electrode active material and its preparation, and in the field of lithium-ion secondary batteries, can solve the problem of no longer having intercalation and deintercalation capabilities, and the intensification of side reactions between positive electrode active materials and electrolytes And other issues

Inactive Publication Date: 2020-11-06
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the lithium-ion battery is charged above 4.2V, the positive electrode active material LiCoO 2 Lithium ions in Li are extracted to form Li 1-x CoO 2 (0≤x≤0.5), continue to charge, when the charging voltage increases to above 4.4V, LiCoO 2 More lithium ions will come out, and then the hexagonal system will transform to the monoclinic system, and the transformed monoclinic LiCoO 2 It will no longer have reversible lithium ion deintercalation ability. At the same time, when the battery system reaches 4.4V and above, the side reaction between the positive electrode active material and the electrolyte will gradually intensify. Therefore, the current commercially used lithium cobalt oxide active material The reversible capacity is much smaller than its theoretical capacity (274mAh / g)

Method used

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  • Cathode active material and preparation method thereof, and application thereof in lithium ion secondary battery
  • Cathode active material and preparation method thereof, and application thereof in lithium ion secondary battery
  • Cathode active material and preparation method thereof, and application thereof in lithium ion secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0102] A positive electrode active material with excellent cycle performance under a high-voltage system, the positive electrode active material includes core materials A1, A2 and shell material B1, wherein the shell material B1 is coated on the surface of the core materials A1, A2 to form a core-shell structure particles; the composition of core materials A1 and A2 is LiCo 0.998 al 0.001 Mg 0.0005 Ni 0.0005 o 2 , the particle size D of nuclear material A1 50 5.5 μm, particle size D of core material A2 50 18.0 μm, the mass ratio of core material A1 and core material A2 is 20:80; the shell material B1 is Li 2 MgTiO 4 , the molecular formula of the positive electrode active material is 0.004 Li 2 MgTiO 4 0.996 Li 0.998 al 0.001 Mg 0.0005 Ni 0.0005 o 2 , the formed positive electrode active material can be defined as (A1+A2)×B1.

[0103] The preparation method of the positive electrode active material is as follows:

[0104] (1) CoCl 2 、Al 2 (SO 4 ) 3 , MgSO 4...

Embodiment 2

[0112] Others are the same as embodiment 1, and the difference is the following steps:

[0113] (1) CoCl 2 、Al 2 (SO 4 ) 3 , MgSO 4 , Nickel acetate is dissolved in water, configured into a solution with a molar ratio of Co:Al:Mg:Ni=99.825:0.1:0.0375:0.0375, and Co doped with Al, Mg, and Ni is prepared. 3 o 4 Precursor.

[0114] (2) Co doped with Al, Mg and Ni prepared above 3 o 4 Precursor, Li 2 CO 3 , MgSO 4 , mixed with nickel acetate, Co:Mg:Ni=0.998:0.00125:0.00125, wherein the molar ratio of Li to Co is 100:99.6, after physically mixing the above substances, place them in a muffle furnace for calcination, and the calcination temperature is 1035°C , the calcination time is 11h, and then the calcined product is pulverized to obtain LiCo with uniform particle distribution. 0.998 al 0.001 Mg 0.0005 Ni 0.0005 o 2 (i.e. the particle size D of nuclear material A1 50 5.5 μm, particle size D of core material A2 50 is 18.0 μm).

[0115] The molecular formula of t...

Embodiment 3

[0118] Others are the same as embodiment 1, and the difference is the following steps:

[0119] (1) CoCl 2 Dissolved in aqueous solution to prepare Co with uniform particle distribution 3 o 4 Precursor;

[0120] (2) Co prepared above 3 o 4 Precursor, Li 2 CO 3 、Al 2 (SO 4 ) 3 , MgSO 4 , nickel acetate mixed, wherein Co:Al:Mg:Ni=0.998:0.001:0.0005:0.0005, the molar ratio of Li and Co is 100:99.6, after the above-mentioned substances are physically mixed, placed in a muffle furnace for calcining, calcining The temperature is 1035°C, the calcination time is 11h, and then the calcined product is pulverized to obtain LiCo with uniform particle distribution. 0.998 al 0.001 Mg 0.0005 Ni 0.0005 o 2 (i.e. the particle size D of nuclear material A1 50 5.5 μm, particle size D of core material A2 50 is 18.0 μm).

[0121] The molecular formula of the positive electrode active material is:

[0122] 0.004Li 2 MgTiO 4 0.996 LiCo 0.998 al 0.001 Mg0.0005 Ni 0.0005 o 2 ....

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Abstract

The invention provides a cathode active material and a preparation method thereof and application thereof in a lithium ion secondary battery. By introducing the high-voltage lithium cobalt oxide cathode active material into the lithium ion secondary battery, the cycle performance of the battery can be effectively improved, and meanwhile, along with the cycle of the lithium ion secondary battery, the DSC exothermic peak appearance temperature of the high-voltage lithium cobalt oxide cathode active material shifts to a lower temperature, but the shift degree is lower.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-voltage lithium cobaltate positive electrode active material, a preparation method thereof, and an application in lithium ion secondary batteries. Background technique [0002] Since the commercialization of lithium-ion batteries, due to its high specific energy and good cycle performance, it has been widely used in digital fields such as notebooks and mobile phones. However, with the continuous improvement of human demand for electronic equipment, higher requirements are put forward for the energy density of lithium-ion secondary batteries. The energy density of batteries has a lot to do with the volume of batteries, discharge voltage platform and discharge capacity. At the same time, it also has a lot to do with the compaction of materials, so increasing the discharge voltage platform of the battery has become one of the effective means to incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525H01M4/131H01M4/02
CPCH01M4/131H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 樊亚楠曾家江李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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