A kind of lithium-ion battery solid electrolyte membrane and preparation method thereof

A solid electrolyte membrane and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of reducing cell capacity, low-temperature performance and rate performance, and increasing ion transmission resistance, so as to reduce ion transmission resistance and speed up ion transmission. , the effect of shortening the resting time

Active Publication Date: 2017-03-22
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SEI film with this structure, due to the presence of inorganic components, is bound to increase the ion transport resistance and reduce the capacity, low temperature performance and rate performance of the battery cell.

Method used

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  • A kind of lithium-ion battery solid electrolyte membrane and preparation method thereof
  • A kind of lithium-ion battery solid electrolyte membrane and preparation method thereof
  • A kind of lithium-ion battery solid electrolyte membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The preparation of the negative electrode sheet: the negative electrode slurry (negative electrode active material: binder: conductive agent is mixed in deionized water according to the ratio of mass ratio: 92:3:5) is coated on the negative electrode current collector, then dried, and then After cold pressing, slitting, and welding the negative tabs, the negative electrode sheet is prepared for use.

[0031] Preparation of the positive electrode sheet: the positive electrode slurry (positive electrode active material: binder: conductive agent is mixed in NMP according to the ratio of mass ratio: 93:2:5) is coated on the positive electrode current collector, then dried, and then passed After cold pressing, slitting, and welding the positive tabs, the positive electrode sheet is prepared for use.

[0032] Preparation of cells to be formed: Assemble the prepared positive electrode sheet, negative electrode sheet, and separator into a bare cell, then place it in an aluminum...

Embodiment 1

[0038] Put the cell to be formed into a hot-pressed forming fixture at a temperature of 45°C, and after applying a surface pressure of 1MPa, record the time for the cell to heat up to 45°C; then use a current of 0.5C to charge the cell to 50% SOC , after the completion of the formation, transfer the cell to a cold-pressing fixture within 30s for cold-pressing the cell. The cold-pressing temperature is 20°C, the pressure is 1MPa, and the time is 5min. Afterwards, the pressure of the cold pressing fixture is released to obtain the degassed cell.

Embodiment 2

[0040] Except following difference with embodiment 1, all the other are identical with embodiment 1:

[0041] Put the cell before formation into a hot-pressing fixture at a temperature of 55°C, and record the time required for the cell to heat up to 55°C.

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Abstract

The invention relates to a lithium ion battery solid electrolyte film (SEI) and a preparation method thereof: the SEI film has one and only one layer structure, the thickness is 5nm-100nm, and the organic lithium salt content is 30wt%-95wt%. The controllable preparation of the above-mentioned SEI film is realized by adjusting the process parameters such as electrolyte composition, hot pressing formation temperature, pressure, current, and SOC, hot pressing transfer time to cold pressing, and cold pressing pressure, temperature, and time. The SEI film with this structure has excellent electrochemical performance, which is mainly manifested in better capacity, better rate performance and low-temperature discharge performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a solid electrolyte membrane (SEI membrane) for lithium ion batteries and a preparation method thereof. Background technique [0002] In 1991, Sony Corporation of Japan creatively adopted carbon materials as the anode material of lithium-ion batteries, which brought revolutionary changes to the field of lithium-ion batteries. Due to the many advantages of lithium-ion batteries, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge and long cycle life, it is the most representative storage battery in the field of new energy. Power devices occupy an irreplaceable position in mobile electronic product power supply devices. However, with the gradual increase in the functions of modern mobile electronic products, their power consumption is also increasing rapidly. At the same time, their ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/058
CPCH01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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