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Lithium ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as affecting electrochemical performance, increasing battery interface impedance, and deteriorating battery performance.

Active Publication Date: 2021-05-11
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the polymer electrolytes prepared in situ are immobile gel or semi-gel substances. This structure inevitably has: (1) During the cycle of the battery, it is easy to generate voids and cause battery performance to deteriorate. Poor; (2) Most of the liquid electrolyte will be reacted during the in-situ generation of the polymer electrolyte, which will gradually increase the interface impedance of the battery and affect the electrochemical performance

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Positive sheet preparation:

[0030] Based on the total mass of the positive electrode material being 100%, 98.25 wt% of NCM811, 0.75 wt% of conductive agent (sp) and 1.0 wt% of PVDF were weighed. The weighed PVDF was configured into an NMP solution with a solid content of 8.0 wt%. Sequentially add the weighed conductive agent (sp) and ternary material to disperse evenly, add NMP to adjust viscosity, and form positive electrode slurry. The positive electrode slurry is coated on the aluminum foil, and after drying, it is rolled and cut to obtain the positive electrode sheet.

[0031] Negative sheet preparation:

[0032] It is 100% by negative electrode material gross mass, weigh the silicon oxygen (SiO) material of 6wt%, the graphite of 90wt%, the conductive agent (sp) of 0.75wt%, the CNT of 0.25wt%, the binding agent of 3wt% ( PVDF). Add the weighed silicon oxide, graphite and sp into the dispersing equipment and stir evenly, then add SWCNT (conductive carbon black)...

Embodiment 2

[0040] Except that the preparation of the mixed solution is different from that in Example 1, other preparation processes are the same as in Example 1.

[0041] Mixture preparation:

[0042] Lithium salt and organic solvent are configured into an electrolyte, and the electrolyte includes: LiPF with a concentration of 1.1M 6 , the solvent is a mixed organic solvent of ethylene carbonate (EC) and diethyl carbonate (DEC). The in-situ solution includes electrolyte, copolymerization precursor and a small amount of initiator. According to the mass ratio: the electrolyte solution: acrylamide (AM) is 8:2, and the content of the initiator azobisbutyronitrile (AIBN) is 0.8% of the monomer content. The above substances are prepared into a uniform and clear mixed solution for later use.

Embodiment 3

[0044] Except that the preparation of the mixed solution is different from that in Example 1, other preparation processes are the same as in Example 1.

[0045] Mixture preparation:

[0046] Lithium salt and organic solvent are configured into an electrolyte, and the electrolyte includes: LiPF with a concentration of 1.1M 6 , the solvent is a mixed organic solvent of ethylene carbonate (EC) and diethyl carbonate (DEC). The in-situ solution includes electrolyte, copolymerization precursor and a small amount of initiator. According to the mass ratio: electrolyte: acrylamide (AM) is 7:3, and the content of the initiator azobisbutyronitrile (AIBN) is 1% of the monomer content. The above substances are prepared into a uniform and clear mixed solution for later use.

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Abstract

The invention provides a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a positive electrode material, a negative electrode material and a polymer electrolyte, and the polymer electrolyte has a -NHLi structure on a contact surface with at least one of the positive electrode material and the negative electrode material. The polymer electrolyte of the lithium ion battery is formed by in-situ polymerization during battery formation. Therefore, a -NHLi structure is formed on the surface of the positive electrode material or / and the negative electrode material, so that effective conduction of lithium ions can be ensured, and the ionic conductivity and the lithium ion transference number are ensured. Meanwhile, the polymer has excellent elastic modulus and can maintain the stability of an interface, so that a stable lithium ion transmission channel and a stable lithium ion transmission interface are provided, and the cycle performance of the battery is improved.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and in particular relates to a lithium ion battery and a preparation method thereof. Background technique [0002] In lithium-ion batteries, polymer electrolytes are usually formed by in-situ polymerization. However, most of the polymer electrolytes prepared in situ are immobile gel or semi-gel substances. This structure inevitably has: (1) During the cycle of the battery, it is easy to generate voids and cause battery performance to deteriorate. Poor; (2) Most of the liquid electrolyte will be reacted during the in-situ generation of the polymer electrolyte, which will gradually increase the battery interface impedance and affect the electrochemical performance. Contents of the invention [0003] In order to solve the above problems, the present invention provides a lithium ion battery and a preparation method thereof. [0004] One aspect of the present invention provides a lithium ion ...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0569H01M10/0525H01M10/058H01M10/44
CPCH01M10/0568H01M10/0569H01M10/0525H01M10/058H01M10/446H01M2300/0025H01M2300/0028Y02P70/50
Inventor 郑东东曹晨王康平华松李旭徐鹏飞
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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