Lithium battery core slurry preparation method

A lithium battery and cell technology, applied in the field of lithium battery cell slurry preparation, can solve the problems of high cost and high battery cost, and achieve the effects of increasing energy density, improving stirring efficiency, and speeding up the preparation process

Inactive Publication Date: 2019-05-10
NANCHANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Lithium-ion batteries have been widely used in technical fields such as mobile phones and mobile power supplies. With the expansion of the application field of lithium-ion batteries, the production cost of lithium-ion batteries and the overall performance of batteries have become hot topics in research. Although lithium-ion batteries have specific energy high, long cycle life, etc., but there is also 1) the high cost of the battery, wherein the cost of the positive electrode material accounts for 1 / 3 of the total cost of the lithium-ion battery, and determines the capacity of the battery. Lithium-ion batteries in the prior art The positive electrode material usually adopts LiCoO 2 , the cost is high due to the scarcity of cobalt resources, 2) The energy density of lithium batteries needs to be further improved

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  • Lithium battery core slurry preparation method

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Effect test

Embodiment 1

[0026] A preparation method of lithium battery cell slurry provided in this embodiment includes the preparation of positive electrode slurry and negative electrode slurry:

[0027] The preparation process of the positive electrode slurry comprises the following steps:

[0028] The positive electrode slurry comprises the following raw material components by mass ratio: lithium hydroxide 65%, manganese dioxide 25%, polyvinylidene fluoride 2%, conductive graphite 3%, silicone oil 0.5% and N-methylpyrrolidone;

[0029] S1. Mix and grind lithium hydroxide and manganese oxide according to the mass ratio of 1:5. The manganese oxide is manganese dioxide, and then place it in a resistance furnace for calcination at 460°C for 8 hours, then raise the temperature to 720°C for 5 hours, and then calcine at 550°C Insulate for 8 hours to obtain a calcined product, and then grind the calcined product into powder for later use;

[0030] S2. Dry the positive electrode conductive agent in an ove...

Embodiment 2

[0036] A preparation method of lithium battery cell slurry provided in this embodiment includes the preparation of positive electrode slurry and negative electrode slurry:

[0037] The preparation process of the positive electrode slurry comprises the following steps:

[0038] The positive electrode slurry contains the following raw material components in mass ratio: lithium hydroxide 70%, manganese dioxide 28%, polyvinylidene fluoride 2%, conductive graphite 3%, silicone oil 0.6% and N-methylpyrrolidone,

[0039] S1. Mix and grind lithium hydroxide and manganese oxide according to the mass ratio of 2:5. The manganese oxide is manganese dioxide, and then place it in a resistance furnace for calcination at 450°C for 6h, then heat up to 700°C for 4-6h, 580 Insulate at ℃ for 8 hours to obtain a calcined product, and then grind the calcined product into powder for later use;

[0040] S2. Dry the positive electrode conductive agent in an oven at 110° C. for 1.5 hours;

[0041] S3...

Embodiment 3

[0046] A preparation method of lithium battery cell slurry provided in this embodiment includes the preparation of positive electrode slurry and negative electrode slurry:

[0047] The preparation process of the positive electrode slurry comprises the following steps:

[0048] The positive electrode slurry contains the following raw material components in mass ratio: lithium hydroxide 64%, manganese dioxide 26%, polyvinylidene fluoride 2%, conductive graphite 3%, silicone oil 0.4% and N-methylpyrrolidone,

[0049] S1. Lithium hydroxide and manganese oxide are mixed and ground according to the mass ratio of 1:4, and then placed in a resistance furnace for calcination at 480°C for 6h, then heated to 750°C for 4h, and kept at 580°C for 8h to obtain a calcined product, and then Grinding the calcined product into powder for subsequent use;

[0050] S2. Dry the positive electrode conductive agent in an oven at 100° C. for 2 hours;

[0051] S3. Add polyvinylidene fluoride and N-met...

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Abstract

The invention discloses a lithium battery core slurry preparation method, and belongs to the technical field of preparation of lithium batteries. The preparation method comprises a positive electrodeslurry preparation technology: mixing lithium hydroxide with manganite and grinding, then putting the ground mixture into a resistance furnace for calcining for 5-10h at the temperature of 450-500 DEGC, then warming to 680-800 DEG C for calcining, keeping the temperature for 8h at the temperature of 500-600 DEG C, thus acquiring a calcined product, and grinding the calcined product into powder for standby; putting a positive electrode conductive agent into an oven for drying; adding a binder and a solvent into a power mixer, stirring at a middle speed, then adding into the positive electrodeconductive agent and silicone oil and stirring at the middle speed, adding the calcined product powder and vacuumizing, stirring at a high speed, and thus acquiring positive electrode slurry; and preparing negative electrode slurry. According to the method provided by the invention, the cost of positive active material of the lithium battery is reduced by 2-3 times, the slurry can be quickly dispersed uniformly by adding the silicone oil into the slurry, the slurry preparation process is quickened, the energy density of the lithium battery is improved, and the energy density is up to 184Wh/kg.

Description

technical field [0001] The invention relates to the technical field of lithium battery preparation, in particular to a method for preparing lithium battery cell slurry. Background technique [0002] Lithium-ion batteries have been widely used in technical fields such as mobile phones and mobile power supplies. With the expansion of the application field of lithium-ion batteries, the production cost of lithium-ion batteries and the overall performance of batteries have become hot topics in research. Although lithium-ion batteries have specific energy high, long cycle life, etc., but there is also 1) the high cost of the battery, wherein the cost of the positive electrode material accounts for 1 / 3 of the total cost of the lithium-ion battery, and determines the capacity of the battery. Lithium-ion batteries in the prior art The positive electrode material usually adopts LiCoO 2 , the cost is high due to the scarcity of cobalt resources, and 2) the energy density of lithium ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1391H01M4/1393H01M10/0525
CPCY02E60/10
Inventor 陈哲沈智徐国栋王苗苗赵康博
Owner NANCHANG INST OF TECH
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