Lithium cobalt oxide positive electrode material and preparation method thereof

Abstract

The invention discloses a lithium cobalt oxide positive electrode material and a preparation method thereof. The preparation methodcomprises the following steps: mixing a cobalt source and a lithium source, and carrying out primary synthesis to obtain a product A; dispersing the product A in an organic solvent to obtain a turbid liquid; putting the turbid liquid into a microwave digestion instrument for treatment to obtain a product B; and allowing the product B to be post-processed to obtain the lithium cobalt oxide positive electrode material. The lithium cobalt oxide positive electrode material is modified by adopting a microwave method, the obtained lithium cobalt oxide positive electrode material is uniform in particle, and a lithium ion battery prepared from the lithium cobalt oxide positive electrode material is relatively high in specific capacity and excellent in cycle performance; and the preparation method has the advantages of simple process, no pollution, low energy consumption and wide application prospect.

Description

technical field

[0001] The invention belongs to the technical field of lithium ion secondary batteries, and in particular relates to a lithium cobalt oxide cathode material and a preparation method thereof. Background technique

[0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, no memory effect, and environmental friendliness. They have been widely used in portable electronic devices such as mobile phones, notebook computers, digital cameras, and electric vehicles. Lithium-ion batteries Among them, the cathode material is a key factor that determines the electrochemical performance, safety performance and future development direction of lithium-ion batteries.

[0003] With the rapid development of science and technology, 3C electronic products such as mobile phones are gradually developing towards miniaturization and multi-function, which put forward higher requirements for the service time and life of lithium-io...

Examples

preparation example Construction

[0029] One aspect of the present invention provides a method for preparing a lithium cobalt oxide positive electrode material, the preparation method comprising the following steps:

[0030] Step 1. Mix the cobalt source and the lithium source to perform a synthesis to obtain product A.

[0031] According to the present invention, in step 1, the cobalt source is a cobalt-containing compound, preferably selected from one or more of tricobalt tetroxide, cobalt hydroxide, cobalt carbonate, cobalt nitrate, and cobalt chloride, more preferably tricobalt tetroxide or cobalt carbonate, for example tricobalt tetroxide.

[0032] According to the present invention, in step 1, the lithium source is a lithium-containing compound, preferably one or more of lithium carbonate, lithium nitrate, lithium hydroxide, lithium oxalate, lithium acetate, lithium oxide, lithium chloride, more preferably Lithium carbonate or lithium hydroxide, such as lithium carbonate.

[0033] According to the pres...

Embodiment 1

[0068] Weigh dry 400g of cobalt tetroxide and 186.8g of lithium carbonate, add them to a high-speed mixer, mix at a high speed of 1500r / min for 80s, then add them to a planetary ball mill for uniform mixing, and ball mill for 3 hours at a speed of 850r / min. After the mixing is completed, the mixture is put into a muffle furnace for a synthesis, and is calcined at a high temperature of 950°C for 8 hours to obtain the product A;

[0069] Take 50g of product A and add it to 400g of absolute ethanol, and ultrasonically treat it to obtain a suspension;

[0070] Move the suspension into the digestion tank of the high-throughput microwave digestion, extraction and synthesis workstation, and add an equal mass of absolute ethanol to the main control tank. The liquid level does not exceed two-thirds of the reaction tank. 300°C, the treatment time is 30min, after the treatment is completed, it is removed from the workstation after cooling to obtain the product B.

[0071] The product B ...

Embodiment 2

[0074] Weigh dry 400g of cobalt tetroxide and 186.8g of lithium carbonate, add them to a high-speed mixer, mix at a high speed of 1600r / min for 70s, then add them to a planetary ball mill for uniform mixing, and ball mill for 3 hours at a speed of 850r / min. After the mixing is completed, the mixture is put into a muffle furnace for a synthesis, and is calcined at a high temperature of 950°C for 8 hours to obtain the product A;

[0075] Take 50g of product A and add it to 400g of absolute ethanol, and ultrasonically treat it to obtain a suspension;

[0076] Move the suspension into the digestion tank of the high-throughput microwave digestion, extraction and synthesis workstation, and add an equal mass of absolute ethanol to the main control tank. The liquid level does not exceed two-thirds of the reaction tank. 300°C, the treatment time is 20min, after the treatment is completed, it is cooled and then removed from the workstation to obtain the product B.

[0077] The product ...

technical field

[0001] The invention belongs to the technical field of lithium ion secondary batteries, and in particular relates to a lithium cobalt oxide cathode material and a preparation method thereof. Background technique

[0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, no memory effect, and environmental friendliness. They have been widely used in portable electronic devices such as mobile phones, notebook computers, digital cameras, and electric vehicles. Lithium-ion batteries Among them, the cathode material is a key factor that determines the electrochemical performance, safety performance and future development direction of lithium-ion batteries.

[0003] With the rapid development of science and technology, 3C electronic products such as mobile phones are gradually developing towards miniaturization and multi-function, which put forward higher requirements for the service time and life of lithium-io...

Examples

preparation example Construction

[0029] One aspect of the present invention provides a method for preparing a lithium cobalt oxide positive electrode material, the preparation method comprising the following steps:

[0030] Step 1. Mix the cobalt source and the lithium source to perform a synthesis to obtain product A.

[0031] According to the present invention, in step 1, the cobalt source is a cobalt-containing compound, preferably selected from one or more of tricobalt tetroxide, cobalt hydroxide, cobalt carbonate, cobalt nitrate, and cobalt chloride, more preferably tricobalt tetroxide or cobalt carbonate, for example tricobalt tetroxide.

[0032] According to the present invention, in step 1, the lithium source is a lithium-containing compound, preferably one or more of lithium carbonate, lithium nitrate, lithium hydroxide, lithium oxalate, lithium acetate, lithium oxide, lithium chloride, more preferably Lithium carbonate or lithium hydroxide, such as lithium carbonate.

[0033] According to the pres...

Embodiment 1

[0068] Weigh dry 400g of cobalt tetroxide and 186.8g of lithium carbonate, add them to a high-speed mixer, mix at a high speed of 1500r / min for 80s, then add them to a planetary ball mill for uniform mixing, and ball mill for 3 hours at a speed of 850r / min. After the mixing is completed, the mixture is put into a muffle furnace for a synthesis, and is calcined at a high temperature of 950°C for 8 hours to obtain the product A;

[0069] Take 50g of product A and add it to 400g of absolute ethanol, and ultrasonically treat it to obtain a suspension;

[0070] Move the suspension into the digestion tank of the high-throughput microwave digestion, extraction and synthesis workstation, and add an equal mass of absolute ethanol to the main control tank. The liquid level does not exceed two-thirds of the reaction tank. 300°C, the treatment time is 30min, after the treatment is completed, it is removed from the workstation after cooling to obtain the product B.

[0071] The product B ...

Embodiment 2

[0074] Weigh dry 400g of cobalt tetroxide and 186.8g of lithium carbonate, add them to a high-speed mixer, mix at a high speed of 1600r / min for 70s, then add them to a planetary ball mill for uniform mixing, and ball mill for 3 hours at a speed of 850r / min. After the mixing is completed, the mixture is put into a muffle furnace for a synthesis, and is calcined at a high temperature of 950°C for 8 hours to obtain the product A;

[0075] Take 50g of product A and add it to 400g of absolute ethanol, and ultrasonically treat it to obtain a suspension;

[0076] Move the suspension into the digestion tank of the high-throughput microwave digestion, extraction and synthesis workstation, and add an equal mass of absolute ethanol to the main control tank. The liquid level does not exceed two-thirds of the reaction tank. 300°C, the treatment time is 20min, after the treatment is completed, it is cooled and then removed from the workstation to obtain the product B.

[0077] The product ...

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