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Additive of lithium ion battery, electrode plate and lithium battery

A technology of lithium-ion batteries and additives, which is applied in the field of electrode sheets, can solve problems such as unsatisfactory cycle life, low specific capacity, and poor rate performance, and achieve the effects of improving electrochemical cycle stability, high energy density, and improving cycle life

Pending Publication Date: 2022-08-02
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the commonly used negative electrode materials are mainly graphite-based carbon materials, but they have problems such as low actual specific capacity, poor rate performance, and unsatisfactory cycle life.

Method used

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  • Additive of lithium ion battery, electrode plate and lithium battery
  • Additive of lithium ion battery, electrode plate and lithium battery
  • Additive of lithium ion battery, electrode plate and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Using lithium cobalt oxide as positive electrode material and cyclohexanol hexaphosphate as additive, a positive electrode sheet and a lithium battery are prepared.

[0057] Mix 80 parts of lithium cobalt oxide positive active material, 10 parts of acetylene black, 10 parts of PVDF binder, 5 parts of cyclohexanol hexaphosphate and an appropriate amount of N-methylpyrrolidone with a high-speed centrifugal homogenizer at 1600rpm for 10min After that, a uniform oily positive electrode slurry was obtained.

[0058] The prepared positive electrode slurry was uniformly coated on aluminum foil with a coater, and then transferred to an air drying oven, and air-dried at 60° C. for 6 hours. Then transfer to a vacuum drying oven for secondary drying. Then, rolling was carried out, and the pieces were cut to obtain a circular positive electrode piece with a diameter of 12 mm, which was stored in a glove box for later use.

[0059] The battery adopts CR2032 type button battery. T...

Embodiment 2

[0061] A positive electrode sheet and a lithium battery were prepared using the same protocol as in Example 1. The difference from Example 1 is that the additive is dodecyl cyclohexanol hexaphosphate.

Embodiment 3

[0063] A positive electrode sheet and a lithium battery were prepared using the same protocol as in Example 1. The difference from Example 1 is that the additive is inositol triphosphate.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses an additive for stabilizing the electrochemical performance of an electrode material of a lithium ion battery, an electrode plate containing the additive and the lithium ion battery. The additive is used in electrode slurry of a positive plate and / or a negative plate, and is a compound with the following structural formula: R1 is selected from phosphate ester, metal salt of phosphate ester, sulfate ester and metal salt of sulfate ester; r2, R3, R4, R5 and R6 are independently selected from alkyl, hydroxyl, carboxyl, phosphate, metal salt of phosphate, phosphite, metal salt of phosphite, pyrophosphate, metal salt of pyrophosphate, sulfate, metal salt of sulfate, sulfonic acid group, metal salt of sulfonic acid, sulfinic acid group and metal salt of sulfinic acid. The additive can improve the high-voltage electrochemical stability of a positive electrode material, prolong the cycle life of a negative electrode material, improve the rate capability of the negative electrode material, and obtain a lithium battery with high cut-off voltage, high energy density and long cycle life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to an additive for stabilizing the electrochemical performance of electrode materials for lithium ion batteries, as well as electrode sheets and lithium ion batteries containing the additive. Background technique [0002] Lithium-ion batteries are widely used in different fields such as 3C electronics, drones, and electric vehicles due to their high energy density and long cycle life, and have become an indispensable part of people's lives. The positive and negative materials used in an ideal lithium-ion battery need to comprehensively consider various factors such as specific capacity, electrochemical performance, safety, and cost. With the continuous improvement of people's requirements for product endurance, it is of great scientific and commercial value to seek to improve the energy density and cycle life of lithium batteries, especially to improve the cycle perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M10/4235Y02E60/10
Inventor 卢周广张方畅程化李志强王洪智王志强
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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