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Functional material, positive plate containing functional material and lithium ion battery

A technology of lithium-ion batteries and functional materials, which is applied in the field of positive electrodes and lithium-ion batteries, can solve problems such as limited effects, and achieve the effects of improving safety performance, avoiding thermal runaway, and improving impedance

Inactive Publication Date: 2020-07-24
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above improvement measures have some effect, but the effect is limited

Method used

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  • Functional material, positive plate containing functional material and lithium ion battery
  • Functional material, positive plate containing functional material and lithium ion battery
  • Functional material, positive plate containing functional material and lithium ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0061] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0062] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0064] (1) Preparation of functional materials in positive electrode slurry

[0065] 0.5 g of polystyrene and 2 g of lithium metal powder were stirred and heated to the melting temperature of polystyrene under an argon atmosphere, and then mixed uniformly to obtain a functional material in which a polymer material was coated with a reducing material.

[0066] In the prepared functional material, the shell is polystyrene, and the core is lithium metal powder; the mass ratio of the shell to the core is 1:4, the thickness of the shell is 0.5 μm, and the average particle size of the functional material is about 5 μm.

[0067] (2) Preparation of positive pole piece

[0068] a. In terms of mass fraction, mix 33.3wt% NMP, 49.3wt% lithium iron phosphate, 6.7wt% polytetrafluoroethylene, 5wt% SP, 5wt% Ketjen black, and 0.7wt% of the above functional materials, stir and disperse evenly to obtain Positive electrode slurry;

[0069] b. coating the positive electrode slurry on the positi...

Embodiment 2-6 and comparative example 1

[0078] The preparation process of Examples 2-6 and Comparative Example 1 is the same as that of Example 1, the only difference is that the selection of functional materials is different, and the selection and mass fraction of each component in the positive electrode slurry are different, as shown in Table 1-Table 3 below:

[0079] The parameters of the functional material in the positive electrode slurry prepared in Table 1 Example 1-6

[0080]

[0081] The mass fraction of each component of the positive electrode slurry of table 2 embodiment 1-6 and comparative example 1

[0082] Positive electrode slurry Solvent wt% Positive electrode active material wt% Binder wt% Conductive agent wt% Functional material wt% Example 1 33.33 49.33 6.67 10 0.67 Example 2 75 24.4975 0.125 0.375 0.0025 Example 3 66.67 27.33 2.33 3.34 0.33 Example 4 64.29 33.93 0.61 0.89 0.28 Example 5 54.55 38.64 1.82 4.77 0.22 Example ...

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Abstract

The invention provides a functional material, a positive plate containing the functional material and a lithium ion battery. Different from a traditional lithium ion battery, the lithium ion battery disclosed by the invention contains 0.01 to 1wt% of functional material. According to the functional material, a polymer directional design coating method is adopted, and a polymer material which is relatively stable with an electrolyte and can conduct oxygen is screened; a solid phase coating method is used for coating the surface of the core-forming material comprising the reducing material withthe shell-layer-forming material comprising the polymer material so as to prepare the functional material. According to the functional material, on the premise that the performance of the lithium ionbattery is not affected, oxygen separated out of the positive electrode material can be effectively adsorbed in the lithium ion charging and discharging process, and the performance of the lithium ionbattery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a functional material, a positive plate containing the functional material and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of no memory effect, high energy density, and environmental protection, and have been widely used in power, energy storage, digital and other fields. At present, the positive electrode materials of high energy density lithium-ion batteries mainly include nickel-cobalt-manganese materials, nickel-cobalt-aluminum materials, lithium-rich manganese-based materials, and lithium cobalt oxide materials. As the charge and discharge process proceeds, a phase transition occurs, oxygen atoms are precipitated, and oxygen atoms combine to form oxygen. Under the catalysis of transition metals or other components in the lithium-ion battery, the precipitated oxygen will accelerate the decomposition...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/62H01M4/13H01M10/0525H01M2004/028Y02E60/10
Inventor 唐伟超李素丽赵伟袁号李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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