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Composite lithium ion battery ceramic diaphragm and preparation method thereof

A lithium-ion battery, ceramic diaphragm technology, applied in battery pack components, separators/films/diaphragms/spacers, circuits, etc. Powder drop and other problems, to achieve the effect of increasing rate discharge and cycle life, improving contact, and reducing interface impedance

Inactive Publication Date: 2015-06-03
LONGYAN ZIJIN INNOVATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of making the battery, we found that the ceramic coated separator is prone to powder shedding (ceramic particles falling off). The ceramic particles are highly hygroscopic, and the contact between the ceramic coated surface and the battery pole piece is a hard-hard contact. The interface impedance of the sheet is large, which affects the overall performance of the battery

Method used

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  • Composite lithium ion battery ceramic diaphragm and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Electrospinning solution preparation: PMMA is dissolved in NMP (N-methylpyrrolidone), the concentration of polyimide is 5wt%, and the viscosity of the polyimide solution is determined to be 100 mPa·S.

[0019] 2) Electrospinning: the prepared PMMA solution electrospinning solution is subjected to single-sided continuous electrospinning on a PET non-woven ceramic membrane through a nanofiber spinning machine, and the conditions for the electrospinning are: temperature 10°C , The voltage is 20kV, the spinning speed is 1g per minute per meter width, and the single-sided thickness of the nanofiber membrane is 1μm.

[0020] 3) Treat the composite membrane obtained after spinning: dry it in an oven at 120°C for 1 minute, to a composite lithium-ion battery ceramic separator, such as figure 1 Shown.

Embodiment 2

[0022] 1) Electrospinning solution preparation: PVA is dissolved in deionized water, the PVA mass volume ratio concentration is 5wt%, and the viscosity of the PVA solution is determined to be 1500 mPa.S.

[0023] 2) Electrospinning: The prepared PVA solution electrospinning solution is subjected to double-sided continuous electrospinning on a polyethylene ceramic diaphragm through a nanofiber spinning machine. The conditions for the electrospinning are: temperature 40°C, voltage 50kV, spinning speed is 10g per minute per meter width, and the single-sided thickness of nanofiber membrane is 10μm.

[0024] 3) The composite membrane obtained after spinning is processed: dried in an oven at 120°C for 5 minutes, to a composite lithium ion battery ceramic separator.

Embodiment 3

[0026] 1) Electrospinning solution preparation: Electrospinning solution preparation: Dissolve polyimide in DMAc (N,N-dimethylacetamide), the polyimide mass volume ratio concentration is 30wt%, measure the The viscosity of the polyimide solution was 3000 mPa.S.

[0027] 2) Electrospinning: The prepared polyimide solution electrospinning solution is subjected to double-sided continuous electrospinning on a PP / PE / PP ceramic coating diaphragm through a nanofiber spinning machine. The electrostatic spinning The conditions are: a temperature of 30°C, a voltage of 40kV, a spinning speed of 5g per minute per meter of width, and a single-sided thickness of the nanofiber membrane of 5μm.

[0028] 3) The composite membrane obtained after spinning is processed: dried in an oven at 120°C for 5 minutes to obtain a composite lithium ion battery ceramic separator.

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Abstract

The invention discloses a composite lithium ion battery ceramic diaphragm, wherein single-face or double-face electrostatic spinning is carried out on a ceramic coating diaphragm. The preparation method comprises the following steps: step 1, preparing an electrostatic spinning solution; step 2, carrying out electrostatic spinning; and step 3, treating the composite diaphragm obtained by spinning. The electrostatic spinning is carried out on the surfaces of the existing polyolefin ceramic coating diaphragm and non-woven fabric ceramic coating diaphragm, the electrostatic spinning can be used for fastening and constraining ceramic granules to prevent the ceramic granules from dropping, and moreover, the electrostatic spinning is used as a soft buffering layer to perfect the contact of the diaphragm with the surface of an electrode, so as to reduce the interface impedance of the diaphragm and a battery pole piece and help to improve such properties of the battery as rate discharge and cycle life, etc.

Description

Technical field [0001] The invention relates to the technical field of battery diaphragms, in particular to a composite lithium ion battery ceramic diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion battery separators are used to block the positive and negative electrodes of lithium-ion batteries to avoid short circuits. With the development of new energy vehicles and other fields, the disadvantage of traditional lithium-ion battery separators such as PE (polyethylene) and PP (polypropylene) separators with low melting points (below 150°C) has affected the safety of high-power lithium-ion batteries. Based on the traditional polyolefin diaphragm, ceramic-coated polyolefin diaphragm and ceramic-coated non-woven diaphragm have been developed. As disclosed in the patent CN104064713, ceramic coating is performed on the basis of polyolefin diaphragm and non-woven fabric, which improves the safety of the diaphragm while improving the ability of the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/44H01M50/446H01M50/46
CPCH01M50/403H01M50/409Y02E60/10
Inventor 刘向文李文锋
Owner LONGYAN ZIJIN INNOVATION RES INST
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