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High-porosity lithium ion battery pole piece, production method and application thereof

A lithium-ion battery, battery pole piece technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc. The effect of porosity

Active Publication Date: 2021-02-26
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is macroscopically adjustable and controllable, but the microscopic pore distribution of the pole piece is still uncontrollable, and there will be uneven pores, and the thin pole piece and low compaction will inevitably lead to low capacity.

Method used

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  • High-porosity lithium ion battery pole piece, production method and application thereof
  • High-porosity lithium ion battery pole piece, production method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Dry mixing of powder

[0046] According to the true density of each material, the volume ratio is calculated as ammonium sulfate: the ratio of positive electrode formula powder material = 1:9 is mixed at a high speed of 3000 rpm in a double planetary mixer for 24 hours to obtain a dry mixed powder;

[0047] The positive electrode formulation powder material is: a mixture of positive electrode active material NCM811, binder PVDF, and conductive carbon black in a mass ratio of 98:1:1.

[0048] (2) Electrostatic spraying

[0049] Connect the aluminum foil, one end of the aluminum foil is on one side of the electrostatic spraying device, and the other end is connected to the high-temperature roller machine. Put the dry mixed powder into the electrostatic spraying device, turn on the power and spray it on the aluminum foil at a speed of 50g / min, with a surface density of 120g / m 2 , the aluminum foil is pulled into a high-temperature double-roll machine at a temperature...

Embodiment 2

[0056] (1) Dry mixing of powder

[0057] The volume ratio calculated according to the true density of each material is ammonium carbonate: the ratio of positive electrode formula powder material=1.3:8.7 is mixed at a high speed of 2800 rpm for 36 hours in a double planetary mixer to obtain a dry mixed powder;

[0058] The positive electrode formula powder material is: a mixture of positive electrode active material NCM811, binder PVDF, and conductive agent Ketjen Black at a mass ratio of 97:1.5:1.5.

[0059] (2) Electrostatic spraying

[0060] Connect the aluminum foil, one end of the aluminum foil is on one side of the electrostatic spraying device, and the other end is connected to the high-temperature roller machine. Put the dry-mixed powder into the electrostatic spraying device, turn on the power and spray it on the aluminum foil at a speed of 30g / min, with a surface density of 150g / m 2 , the aluminum foil is pulled into a high-temperature double-roll machine at a tempe...

Embodiment 3

[0066] (1) Dry mixing of powder

[0067] According to the true density of each material, the volume ratio is calculated as ammonium chloride: the ratio of positive electrode formula powder material=2:8 is mixed at a high speed of 2500rpm for 40h in a double planetary mixer to obtain a dry-mixed powder;

[0068] The positive electrode formula powder material is a mixture of positive electrode active material NCM811, binder PVDF, and conductive carbon black at a mass ratio of 97.5:1.5:1.

[0069] (2) Electrostatic spraying

[0070] Connect the aluminum foil, one end of the aluminum foil is on one side of the electrostatic spraying device, and the other end is connected to the high-temperature roller machine. Put the dry-mixed powder into the electrostatic spraying device, turn on the power and spray it on the aluminum foil at a speed of 40g / min, with a surface density of 130g / m 2 , the aluminum foil is pulled into a high-temperature double-roll machine at a temperature of 190°...

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Abstract

The invention discloses a lithium ion battery pole piece production method. The method comprises the following steps of 1) carrying out dry mixing on a volatile component and a dry powder substance ina battery pole piece formula so as to obtain a mixture, wherein the dry powder substance includes an active substance and a binder; 2) feeding the mixture into an electrostatic spraying device, mixing and spraying to the surface of a current collector to obtain a semi-finished product pole piece; 3) carrying out roller pairing on the semi-finished pole piece at a first temperature, wherein the first temperature is a temperature capable of activating the binder; and 4) carrying out heat treatment on the pole piece subjected to roller pairing at a temperature higher than the first temperature to volatilize the volatile components, and obtaining the pole piece. According to the method disclosed by the invention, the volatile components are uniformly dispersed in a dry powder system in a pre-dry-mixing and electrostatic-mixing manner, and pores left after volatilization of the volatile components are very uniform. The porosity of the pole piece can be adjusted by adjusting the addition amount of volatile components, and the pole piece with high porosity can be obtained.

Description

technical field [0001] The invention relates to the technical field of batteries, and relates to a lithium-ion battery pole piece and a preparation method and application thereof, in particular to a high-porosity lithium-ion battery pole piece and a preparation method and application thereof. Background technique [0002] The commercial lithium-ion battery pole piece is manufactured as a wet electrode technology, including pulping-coating-rolling-slitting and other processes. Slurrying, coating and rolling are the most important in the previous process, which basically determines the performance of the pole piece. good or bad. The porosity of the pole piece is a very important parameter of the pole piece, which determines the migration rate of lithium ions inside the electrode, and therefore also determines the kinetic performance of the cell rate and low temperature. However, the current electrode manufacturing process cannot control the porosity and the porosity is relati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/13H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 甘祖涛殷军曾汉民何巍刘建华刘金成
Owner EVE ENERGY CO LTD