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Positive pole piece as well as preparation method and application thereof

A technology of positive pole piece and positive electrode slurry is applied in the field of positive pole piece and its preparation, which can solve the problems of complicated preparation process and high cost.

Inactive Publication Date: 2021-05-07
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its preparation process is cumbersome and expensive

Method used

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  • Positive pole piece as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a positive pole piece, and the positive pole piece is prepared by the following method:

[0038] (1) 95g ternary material LiNi 0.83 co 0.12 mn 0.05 o 2 , 5g lithium tungsten compound (Li 0.8 m 0.8 W 0.2 o 3) through high-speed stirring and mixing to prepare a blended active material powder. At the same time, 1 g of conductive carbon black SuperP, 0.5 g of carbon nanotubes, 40 g of NMP, and 1 g of PVDF were dispersed and stirred at high speed for 2 hours to prepare a conductive slurry;

[0039] (2) Stir and mix the blended active material powder obtained in step (1) with the conductive slurry at a high speed to obtain a positive electrode slurry, and apply the prepared positive electrode slurry evenly on the aluminum foil with a scraper, and place it in the air to dry In the box, dry at 120° C. for 20 minutes, and finally, roll the dried electrode sheet and cut it to make the positive electrode sheet.

Embodiment 2

[0041] This embodiment provides a positive pole piece, and the positive pole piece is prepared by the following method:

[0042] (1) 93g ternary material LiNi 0.83 co 0.12 mn 0.05 o 2 , 8g lithium tungsten compound (Li 0.8 m 0.8 W 0.2 o 3 ) through high-speed stirring and mixing to prepare a blended active material powder. At the same time, 0.8g conductive carbon black SuperP, 0.6g carbon nanotubes, 45gNMP, 1.1gPVDF were dispersed and stirred at a high speed for 1.8h to prepare a conductive slurry;

[0043] (2) Stir and mix the blended active material powder obtained in step (1) with the conductive slurry at a high speed to obtain a positive electrode slurry, and apply the prepared positive electrode slurry evenly on the aluminum foil with a scraper, and place it in the air to dry In an oven, dry at 130° C. for 25 minutes, and finally roll the dried electrode sheet and cut it to make the positive electrode sheet.

Embodiment 3

[0045] The only difference between this example and Example 1 is that the mass of the lithium tungsten compound is 1 g, and other conditions and parameters are exactly the same as those of Example 1.

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Abstract

The invention provides a positive pole piece as well as a preparation method and application thereof. The positive pole piece comprises a ternary material, a conductive agent, a binder and a tungsten additive, wherein the chemical formula of the tungsten additive is LiaMaW1-aO3, M comprises any one or a combination of at least two of V, Nb or Ta, and a is 0.5-0.9. The positive pole piece contains the tungsten additive, and the tungsten additive can be used as a fast ion conductor to promote rapid migration of lithium ions so as to improve the dynamic performance of an electrode.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a positive pole piece, a preparation method and application thereof. Background technique [0002] Lithium-ion battery is an electrochemical device that uses lithium ions to migrate between positive and negative electrodes. Its advantages are high energy density, reusability, energy saving and environmental protection. Among them, the ternary material LiNi x co y mn 1-x-y o 2 As a positive electrode with high specific capacity in the battery, it has attracted widespread attention. It is characterized by a high theoretical gram capacity of 274mAh / g, a high compacted density of 3.45-3.55, and a high plateau voltage of 3.65-3.68V. However, due to the complex and changeable scenarios in practical applications, higher requirements are placed on batteries and cathode materials. [0003] CN110957463A discloses a positive pole piece, a lithium-ion battery and a manufacturing metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/62H01M4/04H01M10/42H01M10/0525
CPCH01M4/131H01M4/1391H01M4/0404H01M4/0435H01M4/622H01M4/625H01M10/4235H01M10/0525H01M2004/028Y02E60/10
Inventor 汪文静莫方杰孙化雨朱呈岭杨元婴汪东煌
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD