Preparation method and application of single ion conductor nano-particle reinforced lithium battery diaphragm or polymer electrolyte

A nanoparticle and polymer technology, applied in the field of lithium battery polymer electrolyte or separator, can solve the problems of poor thermal shrinkage performance, low ionic conductivity, and no single ion conductor nanoparticle coating the electrochemical performance of lithium batteries.

Active Publication Date: 2014-12-03
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also many disadvantages: it has poor wettability to the electrolyte, low ionic conductivity, and poor thermal shrinkage performance.
However, as far as we know, there is no report on the method of coating single-ion conductor nanoparticles onto lithium battery separators or electrolytes to improve the electrochemical performance of lithium batteries.

Method used

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  • Preparation method and application of single ion conductor nano-particle reinforced lithium battery diaphragm or polymer electrolyte
  • Preparation method and application of single ion conductor nano-particle reinforced lithium battery diaphragm or polymer electrolyte
  • Preparation method and application of single ion conductor nano-particle reinforced lithium battery diaphragm or polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 100 g of single-ion conductor (polymerized pentaerythritol borate lithium salt), 50 g of polyvinylidene fluoride dissolved in 2000 g of N,N-dimethylacetamide, and mechanically grind for 3 h to obtain a uniform nano-single ion conductor. Ionic conductor / polyvinylidene fluoride hybrid paste. Take 500 g of the mixed slurry and pour it into the coating tank, use cellulose non-woven fabric as the substrate, and apply the slurry to the cellulose non-woven fabric substrate with a blade thickness of 50 μm and a tensile tension of 15 MPa. The cloth speed is 1500 mm / min, and the drying temperature is 80 °C. A battery separator or electrolyte reinforced with single ion conductor nanoparticles with a thickness of 30 μm was obtained.

Embodiment 2

[0028] Weigh 100 g of single-ion conductor (polybutyrate borate lithium salt), 80 g of polyacrylonitrile dissolved in 200 g of N,N-dimethylacetamide and 800 g of acetone, and mechanically grind for 3 h to obtain Uniform nano single ion conductor / polyacrylonitrile mixed slurry. Take 500 g of the mixed slurry and pour it into the coating tank, use polypropylene non-woven fabric as the substrate, and coat the slurry on the polypropylene substrate, the thickness of the scraper is 35 μm, the tensile tension is 30 MPa, and the coating speed is 2000 mm / min, drying temperature is 80 ℃. A battery separator or electrolyte reinforced by single ion conductor nanoparticles with a thickness of 25 μm is obtained.

Embodiment 3

[0030] Weigh 50 g of single ion conductor (lithium polytartrate borate), 50 g of polyvinylidene fluoride-hexafluoropropylene and dissolve in 500 g of N,N-dimethylformamide and 500 g of N-methylpyrrolidone , after mechanical grinding for 3 h, a uniform nano-single ion conductor / polyvinylidene fluoride-hexafluoropropylene mixed slurry was obtained. Take 500 g of the mixed slurry and pour it into the coating tank, use the polyester non-woven fabric as the substrate, and apply the slurry to the polyester non-woven fabric substrate with a scraper thickness of 40 μm and a tensile tension of 10 MPa. The cloth speed is 1800 mm / min, and the drying temperature is 120 °C. A battery separator or polymer electrolyte coated with single ion conductor nanoparticles with a thickness of 30 μm was obtained. The present invention is not limited to the above embodiments, and can be prepared according to the material ratio, scraper thickness, coating speed and drying temperature to meet the produc...

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Abstract

The invention belongs to the technical field of a lithium battery diaphragm, and in particular relates to a nanometer single ion conductor coated lithium battery diaphragm and a preparation method thereof. The lithium battery diaphragm adopts a porous polymer membrane or a non-woven fabric as a base material, and adopts single ion conductor nano-particles and polymers for modifying the surface of the base material. The prepared high-performance low-temperature lithium battery diaphragm is 5-100 microns in thickness, is 1-1000s / 100cc in air permeability, is 30-85% in porosity, is 0.02-8 microns in a pore diameter range, and is 100-800% in electrolyte absorptivity. The coated diaphragm has the good low temperature performance, high ionic migration number and ionic conductivity, and good rate capability and long cycle performance, and can improve the stability of an interface with positive and negative materials; and besides, the preparation process is simple and easy to operate, and low in production cost, and the mass production is easy to realize.

Description

technical field [0001] The invention relates to a lithium battery polymer electrolyte or membrane reinforced by single ion conductor nanoparticles; the invention also relates to a preparation method of the lithium battery polymer electrolyte or membrane coated with single ion conductor nanoparticles. Background technique [0002] The polymer electrolyte and the diaphragm are located between the positive and negative electrodes of the lithium battery. Its role is very important. It can isolate the positive and negative electrodes, prevent the internal short circuit of the battery, and at the same time enable the rapid transmission of lithium ions during the charging and discharging process of the battery. It is one of the important components of lithium-ion batteries. The performance of the polymer electrolyte determines the safety performance and internal resistance of the battery, which directly affects the charging and discharging efficiency, capacity and cycle life of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M2/16C09D5/24
CPCC09D5/24H01M10/0565H01M10/058H01M2300/0065H01M50/403H01M50/411Y02E60/10
Inventor 崔光磊丁国梁刘志宏秦炳胜姚建华
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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