Positive electrode material and preparation method thereof, and lithium ion battery containing positive electrode material

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low cycle performance, reduce the amount of residual alkali, improve high-temperature storage performance and safety performance, and stabilize the surface of materials Effect

Active Publication Date: 2019-12-27
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this solution reduces the amount of residual alkali, but the cycle performance is low

Method used

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  • Positive electrode material and preparation method thereof, and lithium ion battery containing positive electrode material
  • Positive electrode material and preparation method thereof, and lithium ion battery containing positive electrode material
  • Positive electrode material and preparation method thereof, and lithium ion battery containing positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The preparation process of the positive electrode material in this embodiment is as follows:

[0066] (1) Weigh the precursor (Ni 0.70 co 0.15 mn 0.15 )(OH) 2 100.00g, placed in an oxygen atmosphere furnace and sintered at 750°C for 4h to obtain primary sintered powder; weigh 65.28g lithium hydroxide monohydrate (LiOH·H 2 O) mixed with primary sintering powder (primary sintering powder and lithium source molar ratio 1:1) and then sintered at 880°C for 12h, the heating rate was 5°C / min, and the atmosphere was empty. After cooling with the furnace, grind and sieve to obtain secondary sintered powder.

[0067] (2) Weigh iridium oxide (IrO 2 ) 4.760g and the secondary sintered powder obtained in step (1) were ultrasonically dispersed in 650mL of deionized water, then transferred to a 1L hydrothermal reaction kettle, and reacted at 180°C for 12h. After filtration, vacuum-dry at 120°C for 12 hours to obtain hydrothermal product powder.

[0068] (3) Sinter the hydrothe...

Embodiment 2

[0083] The preparation process of the positive electrode material in this embodiment is as follows:

[0084] (1) Weigh the precursor (Ni 0.80 co 0.10 mn 0.10 )(OH) 2 100.00g, placed in an oxygen atmosphere furnace and sintered at 650°C for 12h to obtain primary sintered powder; weigh 57.47g lithium carbonate (Li 2 CO 3 ) and primary sintering powder (the molar ratio of primary sintering powder to lithium source is 1:1) and then sintered at 840°C for 18 hours, the heating rate is 10°C / min, the atmosphere is oxygen atmosphere, and the oxygen concentration is >95%. After cooling with the furnace, grind and sieve to obtain secondary sintered powder.

[0085] (2) Weigh iridium tetrafluoride (IrF 4 ) 0.714g and the secondary sintered powder obtained in the step were ultrasonically dispersed in 550mL of deionized water, then transferred to a 1L hydrothermal reaction kettle, and reacted at 160°C for 16h. After filtration, vacuum-dry at 100°C for 12 hours to obtain hydrothermal...

Embodiment 3

[0092] The preparation process of the positive electrode material in this embodiment is as follows:

[0093] (1) Weigh the precursor (Ni 0.80 co 0.15 Al 0.05 )CO 3 100.00g, placed in an oxygen atmosphere furnace and sintered at 800°C for 20h to obtain a primary sintered powder; weigh 57.47g of lithium hydroxide monohydrate (LiOH·H 2 O) mixed with primary sintering powder (primary sintering powder and lithium source molar ratio 1:1) and then sintered at 780°C for 20h, the heating rate was 5°C / min, the atmosphere was an oxygen atmosphere, and the oxygen concentration was >98%. After cooling with the furnace, grind and sieve to obtain secondary sintered powder.

[0094] (2) Weigh iridium nitrate (Ir(NO 3 ) 4 ) and iridium acetate (the total mass of the mixture is 2.337g) and the secondary sintered powder obtained in step (1) was ultrasonically dispersed in 750mL deionized water, and then transferred to a 1L hydrothermal reactor, and reacted at 250°C for 16h. After filtrat...

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Abstract

The invention discloses a positive electrode material and a preparation method thereof, and a lithium ion battery containing the positive electrode material. The positive electrode material comprisesa ternary positive electrode material and an iridium oxide layer being coated on a surface of the ternary positive electrode material. The preparation method comprises steps of 1) carrying out primarysintering of a ternary precursor, mixing the obtained primary sintering powder with a lithium source, and carrying out secondary sintering to obtain secondary sintered powder; 2) mixing the secondarysintered powder obtained in the 1) with an iridium source, carrying out hydrothermal reaction, and carrying out solid-liquid separation after the reaction to obtain solid which is a hydrothermal product; and 3) sintering the hydrothermal product obtained in the 2) to obtain the positive electrode material. The positive electrode material is advantaged in that the positive electrode material is low in residual alkali content and good in cycle performance; when the iridium oxide is doped into the crystal structure of the ternary positive electrode material, electrochemical performance is more excellent; the preparation method is simple and easy to control, and doping of the iridium oxide into the ternary positive electrode material crystal structure can be realized by regulating and controlling preparation conditions.

Description

technical field [0001] The invention belongs to the field of positive electrode materials of lithium ion batteries, and relates to a positive electrode material, a preparation method thereof and a lithium ion battery containing the positive electrode material. Background technique [0002] With the intensification of energy and environmental protection issues, energy storage devices have become a key factor. Among the many energy storage devices, the application of lithium-ion secondary batteries in electric vehicles and portable electronic devices is irreplaceable in the short term, and it also shows great prospects in large-scale energy storage power stations. Current lithium-ion battery cathode materials include LiFeO 4 , LiCoO 2 , LiMn 2 o 4 , layered NCM, NCA. Layered nickel-cobalt-manganese ternary cathode material, as an important cathode material for lithium-ion batteries, has high specific capacity and high energy density, and is widely used in lithium-ion seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 张红来杨顺毅严武渭黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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