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Infiltration improvement additive, pole piece, infiltration method of pole piece, battery and preparation method of battery

A technology of additives and pole pieces, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of electrolyte concentration polarization, affecting battery safety and life, and difficulty in electrolyte infiltration, so as to improve the infiltration performance , Increase the porosity, which is beneficial to the effect of preserving the electrolyte

Active Publication Date: 2020-09-08
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many ways to increase the energy density, such as increasing the coating thickness of the positive and negative pole pieces, increasing the compaction density of the pole piece, and increasing the proportion of active material in the pole piece, etc., but these methods will affect the safety and reliability of the battery. Life, can not improve the overall performance of the battery
The main reason is that thick coating density and high compaction density will reduce the porosity of the pole piece, resulting in difficulty in electrolyte infiltration and impeding ion transmission, which will seriously reduce the cycle performance and rate performance of the battery
[0003] Existing technologies cannot improve the overall performance of the battery
The pores in the pole piece are narrow and the pores are not connected. The conduction of lithium ions in it is hindered, which is easy to cause the concentration polarization of the electrolyte and reduce the cycle performance and rate performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The material NCM523 (addition amount 98wt%) required for the positive electrode, the binder PVDF (addition amount 1wt%), and the conductive agent sp (addition amount 1wt%) are homogenized in proportion, and the slurry is coated on the aluminum foil current collector. After coating and drying, spray molten ethylene carbonate on the surface of the pole piece, put it in a vacuum high-temperature box at a temperature of 80°C, vacuumize, and vacuum at a degree of 0.02MPa. The ester is infiltrated into the inside of the pole piece, and after cooling, ethylene carbonate is filled in the pores of the positive pole piece, and then rolled and sliced ​​to obtain a positive pole piece containing an infiltration-improving additive; graphite (95.5 wt%), the material required for the negative electrode, The conductive agent sp (addition amount 1wt%), the binder CMC (addition amount 1wt%), and the binder SBR (addition amount 2.5wt%) are homogenized in proportion, and the slurry is coate...

Embodiment 2

[0049] The materials required for positive electrode NCM523 (addition amount 98wt%), binder PVDF (addition amount 1wt%), and conductive agent sp (addition amount 1wt%) are homogenized and coated in proportion, and the slurry is coated on the aluminum foil current collector After coating and drying, directly carry out rolling and slicing to obtain the positive electrode sheet; the material graphite (addition amount 95.5wt%) required for the negative electrode, conductive agent sp (addition amount 1wt%), binder CMC (addition amount 1wt%) ), the binder SBR (addition amount 2.5wt%) is homogeneously coated in proportion, the slurry is coated on the copper foil current collector, and after coating and drying, the molten ethylene carbonate is sprayed on the pole piece surface, put it in a vacuum high-temperature box at a temperature of 80 ° C, vacuumize, and vacuum degree 0.02 MPa, and let it stand for 90 minutes to make the infiltration improving additive ethylene carbonate infiltrat...

Embodiment 3

[0051] The materials required for positive electrode NCM523 (addition amount 98wt%), binder PVDF (addition amount 1wt%), and conductive agent sp (addition amount 1wt%) are homogenized and coated in proportion, and the slurry is coated on the aluminum foil current collector After coating and drying, spray molten ethylene carbonate on the surface of the pole piece, put it in a vacuum high-temperature box at a temperature of 80°C, vacuumize at a vacuum degree of 0.02MPa, and let it stand for 90 minutes to make the wetting additive ethylene carbonate Infiltrate to the inside of the pole piece, and after cooling, ethylene carbonate is filled in the pores of the positive pole piece, and then rolled and sliced ​​to obtain a positive pole piece containing a wetting-improving additive; graphite (95.5wt%), the material required for the negative electrode, is conductive Agent sp (addition amount 1wt%), binder CMC (addition amount 1wt%), binder SBR (addition amount 2.5wt%) are homogeneousl...

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Abstract

The invention provides an infiltration improvement additive, a pole piece, an infiltration method of the pole piece, a battery and a preparation method of the battery. The infiltration improvement additive is one or a mixture of more than two of carbonic ester substances, sulfate ester substances and phosphate ester substances. According to the infiltration improvement additive, the infiltration improvement additive can be used for pole piece preparation, can be dissolved into an electrolyte to become part of the electrolyte in the final lithium ion battery preparation process, enables the pole piece to be filled with the electrolyte, and improves the infiltration performance of the pole piece. Meanwhile, the position occupied by an original additive is enabled to become pores, the porosity of the pole piece is increased, and the storage of the electrolyte is facilitated.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a wetting improving additive, a pole piece and a wetting method thereof, a battery and a preparation method thereof. Background technique [0002] In today's society, lithium-ion batteries have been used in all aspects, from portable electronic products to electric vehicles, energy storage power supplies, aviation fields and so on. At present, the country is vigorously developing new energy vehicles. In recent years, the proportion of new energy vehicle sales in my country has steadily increased. It is expected that by 2025, the proportion of new energy vehicle sales in my country will reach about 25%. However, the performance of lithium-ion batteries is not enough to support people's travel needs, and higher requirements are put forward for the performance of lithium-ion batteries. On the basis of ensuring safety, the energy density and cycle life of batteries sh...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M10/0525H01M10/0567H01M10/058
CPCH01M4/62H01M4/13H01M4/139H01M10/0525H01M10/0567H01M10/058H01M2004/021H01M2004/028Y02E60/10Y02P70/50
Inventor 韩帅帅董晶高秀玲从长杰
Owner TIANJIN ENERGIES
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