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Preparation method of lithium nickel manganese cobalt positive electrode material, lithium ion battery positive electrode material and lithium ion battery

A technology of nickel cobalt lithium manganate and lithium ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that the electrochemical performance of products cannot be guaranteed, the uniformity of precursor lithium mixing is poor, and the bulk density of powder materials can be solved. Low problems such as excellent cycle stability, improved material stability, and easy control of reaction conditions

Active Publication Date: 2017-12-12
NORTHERN ALTAIR NANOTECH CO LTD
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Problems solved by technology

In the existing preparation method, the step of mixing the lithium source and the precursor must be experienced, and then the existing precursor mixed lithium technology still has the problem of uneven mixing, resulting in poor uniformity of the mixed lithium precursor, which in turn leads to Lithium-rich or lithium-deficient samples appear after sintering, and the stability between batches is poor, which affects various performance indicators of the material, and the electrochemical performance of the product cannot be guaranteed
In the existing ternary material preparation methods, there are still defects such as nickel, cobalt, and manganese, which cannot be fully and uniformly mixed, cannot fully exert their respective functions, and the bulk density of the synthesized powder material is low.
In addition, the existing preparation method steps are complex, the process steps are too long, too many compounds are added, the reaction process is difficult to control, and the cost is high, which is not conducive to practical application

Method used

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  • Preparation method of lithium nickel manganese cobalt positive electrode material, lithium ion battery positive electrode material and lithium ion battery
  • Preparation method of lithium nickel manganese cobalt positive electrode material, lithium ion battery positive electrode material and lithium ion battery
  • Preparation method of lithium nickel manganese cobalt positive electrode material, lithium ion battery positive electrode material and lithium ion battery

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preparation example Construction

[0040] In the first aspect, this embodiment provides a method for preparing a nickel-cobalt lithium manganese oxide positive electrode material, comprising the following steps:

[0041](a) preparing an aqueous solution of a ternary material precursor with a weight concentration of 45% to 60%;

[0042] (b) preparing an aqueous solution of a lithium source compound with a weight concentration of 20% to 30%;

[0043] (c) pumping the aqueous solution of the ternary material precursor and the aqueous solution of the lithium source compound into the mixer respectively, mixing and stirring evenly to obtain a suspension;

[0044] (d) spray drying the suspension to obtain a mixed lithium powder;

[0045] (e) Sintering the lithium complex mixed powder to obtain a positive electrode material of nickel cobalt lithium manganese oxide.

[0046] In view of the fact that in the preparation process of the existing nickel-cobalt lithium manganese oxide positive electrode material, there are f...

Embodiment 1

[0091] A preparation method of nickel-cobalt lithium manganese oxide cathode material, comprising the following steps:

[0092] (a) Preparation of ternary material precursor Ni with a weight concentration of 45% 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 aqueous solution;

[0093] (b) preparation weight concentration is the aqueous solution of lithium hydroxide monohydrate of 20%;

[0094] (c) The ternary material precursor Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 The aqueous solution of lithium hydroxide monohydrate and the aqueous solution of lithium hydroxide monohydrate are transported in the high-speed mixer respectively with pump, and the rotating speed of mixer is 2500rpm, and stirring time is 60min, and stirring temperature is normal temperature, mixes and stirs evenly, obtains suspension;

[0095] (d) Spray drying the suspension, the compressed air pressure of the spray dryer is 0.15MPa, and the temperature at the nozzle is 250°C to obtain a mixed lithium powder;

[0096] (e) Sinter the mi...

Embodiment 2

[0098] A preparation method of nickel-cobalt lithium manganese oxide cathode material, comprising the following steps:

[0099] (a) Preparation of ternary material precursor Ni with a weight concentration of 50% 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 The aqueous solution of the aqueous solution, and the aqueous solution is ultrasonically treated, the ultrasonic frequency is 30KHz, and the ultrasonic treatment time is 30min;

[0100] (b) preparing an aqueous solution of lithium hydroxide monohydrate with a weight concentration of 25%, and performing ultrasonic treatment on the aqueous solution, the ultrasonic frequency is 40KHz, and the ultrasonic treatment time is 30min;

[0101] Steps (c), (d), (e) are the same as in Example 1.

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Abstract

The invention belongs to the technical field of a lithium ion battery, and relates to a preparation method of a lithium nickel manganese cobalt positive electrode material, a lithium ion battery positive electrode material and a lithium ion battery. The preparation method of the lithium nickel manganese cobalt positive electrode material, provided by the invention, comprises the following steps of preparing a ternary material precursor aqueous solution with weight concentration being 45-60%; preparing a lithium source compound aqueous solution with weight concentration being 20-30%; sending the ternary material precursor aqueous solution and the lithium source compound aqueous solution to an agitator by a pump, and performing uniform mixing and stirring to obtain a suspension liquid; performing spray drying on the suspension liquid to obtain lithium mixed powder; and sintering the lithium mixed power to obtain the lithium nickel manganese cobalt positive electrode material. By the preparation method, the mixing efficiency of a precursor and a lithium source compound and the mixed grain uniformity can be improved; and meanwhile, the preparation method is convenient to operate and easy to control and is moderate in reaction condition, and the prepared positive electrode material has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a nickel-cobalt lithium manganese oxide positive electrode material, a lithium ion battery positive electrode material and a lithium ion battery. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage and self-discharge rate. The key material of lithium-ion batteries is the cathode material, which accounts for about 30% of the cost of lithium-ion batteries. At present, the positive electrode materials used in lithium-ion batteries on the market mainly include lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, and nickel-cobalt lithium manganate ternary materials. Nickel cobalt lithium manganate ternary material is a n...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 武雪峰马书良成信刚付笑哲
Owner NORTHERN ALTAIR NANOTECH CO LTD
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