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Lithium ion battery film cathode containing porous polymer elastomer and preparation method thereof

A porous polymer, lithium-ion battery technology, applied in the field of electrochemistry, can solve the problems affecting the rate performance and cycle life of the material, the increase of the internal resistance of the battery, the deterioration of the cycle performance, and the lack of effective active materials, so as to shorten the transmission path and avoid the capacity. Excellent effect of attenuation and magnification performance

Active Publication Date: 2011-07-20
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Recently, a lot of work has been done to improve the electrochemical performance of these materials that have high initial lithium intercalation capacity but are prone to volume expansion during intercalation and delithiation. It cannot fundamentally solve the defects of internal resistance increase and cycle performance deterioration caused by expansion and pulverization; nano-film has high specific capacity, good cycle performance and high rate charge and discharge performance, but its effective active materials are less, and The preparation conditions are harsh; nanowires and nanotubes are effective in inhibiting the expansion of the charge and discharge process, but the polarization of Si nanowires at high current densities is strengthened, which affects the rate performance and cycle life of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 Using commercial nano-Si and commercial porous conductive polypyrrole (PPy) elastomers as raw materials, the film negative electrode was prepared by mechanical rolling method

[0031] In the first step, the silane coupling agent is added to the nano-Si of high-speed stirring in several times to obtain the nano-silicon of the surface grafting treatment; the particle of the nano-Si is 20-30nm, and the addition amount of the silane coupling agent is 1 / 2 of the mass of the nano-Si particle. 5 / 10,000, the stirring speed used is 2000r / min, and the stirring time is 60min;

[0032] In the second step, the surface-modified high-capacity nanoparticles obtained in the previous step are dispersed in ethanol by ultrasonic, and the solid content in the mixed solution is 5%. The ultrasonic dispersion uses an ultrasonic intensity of 800kHz and a time of 30min. .

[0033] The third step is to select a commercial porous PPy with a tensile strength of 20-30MPa, a conductivity o...

Embodiment 2

[0036] Example 2 Using commercial nano-Sn-Co alloy powder and commercial porous conductive polythiophene (PTh) elastomer as raw materials, a thin film negative electrode is prepared by electrochemical electrophoresis

[0037] Select a commercial porous PTh with a tensile strength of 20-30MPa, a conductivity of 150S / cm, a pore size of 40-50nm, a pore volume content of 60-70%, and a thickness of 15um, and select nano Sn- with a particle size of 20-30nm. Co powder is used as raw material.

[0038] In the first step, the selected PTh is scraped and coated on the copper foil dedicated to lithium-ion batteries with a scraper, and its weight is weighed.

[0039] In the second step, an electrophoretic solution containing high-capacity nano-Sn-Co particles is prepared. Firstly, add the titanate coupling agent to the high-speed stirring nano-Sn-Co several times to obtain surface-grafted nano-silicon; the particle size of the nano-Sn-Co particles is 20-30nm, and the titanate coupling ag...

Embodiment 3

[0044] Example 3 Using commercial nano-Sn and commercial porous conductive polyaniline (PAn) elastomers as raw materials, a thin film negative electrode is prepared by suction filtration

[0045] The first step is the surface treatment and dispersion of nano-Sn.

[0046] First, surface treatment is performed on nano-Sn. Get 20-30nm nano-Sn particles and place them in a stirrer to stir, and meanwhile, add a surface modifier dropwise to obtain surface-modified high-capacity nanoparticles; the stirring speed used in this embodiment is 1000r / min, and the stirring time is 60min; the surface modifier adopted is stearic acid, and its addition amount is 3 / 10,000 of the mass of nano Sn particles.

[0047] Secondly, supersonically disperse the surface-treated nano Sn into a volatile acetone solution to form a high-capacity nanoparticle suspension, and the solid content of the suspension is 10%; the supersonic dispersion uses an ultrasonic intensity of 1000kHz and a time of 45min .

...

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Abstract

The invention discloses a lithium ion battery film cathode containing a porous polymer elastomer, which comprises a copper foil current collector and a surface coating, wherein the surface coating is uniformly coated on the surface of the copper foil current collector; and the surface coating is formed in a way that a high-capacity nano particle is compounded in a directional porous polymer elastomer. The high-capacity nano particle is loaded in a hole of the porous polymer elastomer through suction filtration, rolling and electrophoresis and coated on the copper foil current collector. The porous polymer elastomer is one of porous polythiophene, porous polypyrrole or porous polyaniline. The film cathode prepared in the invention can effectively prevent the high-capacity nano particle from causing pulverization due to volumetric expansion and causing capacity attenuation due to secondary agglomeration in charge and discharge processes, and improves the circulation property of the nanoparticle. Meanwhile, the porosity of the polymer can ensure rapid transmission of lithium ions in the cathode, thereby achieving the purpose of being rapidly charged and discharged. The cathode prepared in the invention can be directly used in battery assembly without tabletting or filming, and is suitable for industrialized production.

Description

technical field [0001] The invention discloses a thin film negative electrode for a lithium ion battery and a preparation method thereof, in particular to a lithium ion battery thin film with a high capacity and excellent cycle performance and a porous polymer elastomer containing a porous polymer elastomer component Negative electrode and preparation method thereof. It belongs to the field of electrochemical technology. Background technique [0002] The demand for high-energy lithium-ion batteries in fields such as electric vehicles is becoming more and more urgent. At present, commercialized lithium-ion batteries using graphite-based carbon materials as anode materials have seriously hindered the further improvement of lithium-ion battery capacity due to defects such as low specific capacity of carbon-based anodes (theoretical capacity is 372mAh / g). In recent years, high-capacity anode materials developed to replace carbon materials, such as Al, Sn, Ge metals and their a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/80H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杨娟周向阳刘宏专伍上元娄世菊邹幽兰唐晶晶
Owner 湖南宸宇富基新能源科技有限公司
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