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Solid electrolyte interface (SEI) film for anode of lithium ion battery and preparing method of SEI film

A lithium-ion battery and anode technology, which is applied in battery electrodes, electrolyte battery manufacturing, battery pack components, etc., can solve the problems of first-time efficiency, reversible capacity and energy density of cells, and large irreversible capacity.

Active Publication Date: 2012-07-25
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above phenomenon will lead to a large irreversible capacity consumed in the formation process, and a decrease in the first efficiency, reversible capacity and energy density of the cell.

Method used

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  • Solid electrolyte interface (SEI) film for anode of lithium ion battery and preparing method of SEI film
  • Solid electrolyte interface (SEI) film for anode of lithium ion battery and preparing method of SEI film
  • Solid electrolyte interface (SEI) film for anode of lithium ion battery and preparing method of SEI film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Stir the artificial graphite with other ingredients to prepare the anode slurry and coat it on the copper foil, then wind or stack the prepared anode sheet, cathode sheet and separator to obtain the bare cell, and put the bare cell into the Bake in the packaging bag or packaging shell, then inject an appropriate amount of electrolyte, and let it stand until the electrolyte is fully soaked before use.

[0037] Use a chemical forming machine to carry out the first chemical formation of the above-mentioned battery cores. The formation temperature is 15°C, the formation current is 0.01C, and the formation cut-off potential is 3.0V; after that, the batteries are taken out, and the batteries are placed in the Bake it in a baking oven at 60°C for 30 minutes, take it out, and then use a chemical formation machine to carry out the second formation. The formation temperature is 35°C, the formation current is 0.04C, and the formation cut-off potential is 3.9V. The anode SEI film o...

Embodiment 2

[0039] Take natural graphite and other ingredients to make anode slurry and coat it on copper foil, then wind and assemble the prepared anode sheet, cathode sheet, and separator to obtain a bare cell, and put the bare cell into an aluminum-plastic film Top seal and side seal are carried out in the packaging bag, and then put into the oven to bake, and then inject an appropriate amount of electrolyte, and stand until the electrolyte is fully infiltrated before use.

[0040] Use a chemical forming machine to carry out the first chemical forming of the above-mentioned cells. The forming temperature is 45°C, the forming current is 0.02C, and the forming cut-off potential is 3.6V. After the forming process is completed, the AC impedance of the cell is scanned. The results are as follows figure 1 As shown; after that, take out the cell, apply a surface pressure of 1 MPa to the cell, put it in a baking oven at 85°C for 6 hours, take it out, and scan the AC impedance of the cell again,...

Embodiment 3

[0042] Stir the artificial graphite with other ingredients to prepare the anode slurry and coat it on the copper foil, then wind or stack the prepared anode sheet, cathode sheet and separator to obtain the bare cell, and put the bare cell into the Bake in the packaging bag or packaging shell, then inject an appropriate amount of electrolyte, and let it stand until the electrolyte is fully soaked before use.

[0043] Use a chemical forming machine to carry out the first chemical formation of the above-mentioned batteries, the chemical formation temperature is 115°C, the chemical formation current is 1C, and the chemical formation cut-off potential is 2.8V; after that, the battery is taken out, and the surface of the battery is placed at 115 under a pressure of 10MPa. ℃ baking oven for 20 hours and then take it out; then use a chemical forming machine to carry out the second chemical forming, the forming temperature is 65 ℃, the forming current is 0.2C, and the forming cut-off po...

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Abstract

The invention discloses a solid electrolyte interface (SEI) film for an anode of a lithium ion battery and a preparing method for sectional formation of the SEI film. The preparing method is characterized in that: by adjusting parameters, such as, formation temperature, current density, cut-off voltage, baking pressure, baking time, baking temperature and the like, the SEI film with a multi-layer structure for the anode of the lithium ion battery is obtained, wherein an inner layer of the SEI film is mainly maid from brittle substances with a compact structure and good electric insulating property; and an outer layer of the SEI film is mainly made from ductile substances with a relatively loose structure and stronger ionic conduction ability. The SEI film with multi-layer structure prepared by the method has the following advantages: firstly, the SEI film is a very ideal SEI film structure; secondly, the composition of each layer of the multi-layer SEI film is controllable; thirdly, the thickness of each layer of the SEI film is controllable and adjustable; and finally, when the SEI film is prepared by the technology, adjusted parameters are all of quantized values, therefore, industrial production is simple in operation and easy to implement.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a multilayer SEI film (short for Solid Electrolyte Interface, translated as solid electrolyte interface film) of a lithium ion battery anode and a preparation method thereof. Background technique [0002] As the most representative energy storage device in the new energy field, lithium-ion batteries occupy an irreplaceable position in the power supply of mobile electronic products. With the gradual increase in the functions of modern mobile electronic products, their power consumption is also increasing rapidly. At the same time, their own volume is developing in a smaller direction. Therefore, high-energy-density batteries have become the choice of modern mobile power supplies. development trend. [0003] The existing methods to increase the energy density of batteries mainly include: developing high-performance cathode and anode active materials, increasing the proportion ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M4/139H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 游从辉李白清徐延杰杨玉洁江辉方宏新张柏清
Owner NINGDE AMPEREX TECH