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Lithium iron cell element produced by using microcomposite powder

A lithium-ion battery, composite powder technology, applied in electrical components, battery pack parts, secondary batteries, etc., can solve the problem of insufficient mixing of fillers and fluoropolymers

Inactive Publication Date: 2002-11-06
ATOFINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] In the prior art, the mixing of fillers with fluoropolymers was insufficient

Method used

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  • Lithium iron cell element produced by using microcomposite powder
  • Lithium iron cell element produced by using microcomposite powder
  • Lithium iron cell element produced by using microcomposite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0086] Use the following products:

[0087] No. 1 PVDF latex is the homopolymer latex of VF2, obtains by emulsion polymerization, is characterized in that dry extract is 35% by weight (uses the HG53 type instrument of Mettler Toledo company, latex adopts weighing measurement after 160 ℃ of drying 10 minutes residue), and an average particle size of 140 nm (determined by laser diffraction using a Coulter trade mark particle sizer). The resulting PVDF is characterized in 100 sec -1 It has a melt viscosity of 1200 Pa·s at 230°C under shear, a melting point of 171°C (measured according to ISO 3146 standard) and a tensile modulus of 2200 MPa at 23°C (measured according to ISO 527 standard). PVDF density is 1.78 (measured according to ISO 1183).

[0088] PVDF Latex No. 2 is a copolymer latex of VF2 / HFP (10% by weight HFP), obtained by emulsion polymerization, characterized by a dry extract of 31% by weight and an average particle size of 230 nm. This PVDF is characterized at 100 ...

Embodiment 2

[0097] Embodiment 2: preparation is the composite powder of main component with PVDF latex, graphite and carbon black: in the disperser identical with aforementioned, and wherein the graphite of embodiment 1 and carbon black homogeneous dispersion (slurry) are housed, Gradually add No. 1 PVDF latex under proper stirring (300 revs / min), and its ratio is such that graphite+carbon black dry weight ratio is 86% in graphite+carbon black+PVDF total amount. Demineralized water was also added gradually to maintain a total dry extract weight of 20% in the slurry and latex mixture.

[0098] This kept stirred liquid mixture was atomized with a Minor Mobile atomizer (produced by NIRO) under the following conditions:

[0099] The hourly flow rate of the mixture = 2 liters / hour

[0100] The inlet temperature of hot air reaching the turbine = 175°C

[0101] ·Outlet temperature measured at the air outlet = 55°C

[0102] • Air pressure for specified turbine speed = 2.2 bar. The resulting m...

Embodiment 3

[0103] Embodiment 3: The composite powder of embodiment 2 is processed by dusting+calendering

[0104] The copper spool is loaded on the mounting head, and the copper foil is uncoiled and passed through the intermediate roller. The unwinding speed maintained was 1.2 m / min. The composite powder of example 2 was deposited by triboelectric action (by means of a powder gun) in a homogeneous layer (the thickness of this layer depends on the desired final thickness after calendering). The copper foil was heated to about 200°C with an infrared light source in order to promote coalescence of the homogeneous layer and its adhesion to the copper foil. A second infrared light source is installed downstream of the powder gun to heat the top surface of the homogeneous layer.

[0105] The entire copper foil, covered by a uniform layer, then passes through a calender system between rubber rolls and conditioned metal rolls (heated or cooled). This system, which now constitutes the electrod...

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Abstract

The invention relates to a lithium-ion battery element selected from the group consisting of a separator and an electroactive layer. The element is formed from a micro-composite powder containing fluorine-containing polymers and fillers in the form of 0.1-0.5 micron particles. It also relates to a lithium-ion battery element. An electrode of a battery, which includes the aforementioned electroactive layer connected to a metal layer; and also relates to a lithium ion battery, which includes at least one element such as a separator, an electroactive layer or an electrode as defined above. This microcomposite powder can be prepared by co-atomizing an aqueous solution containing 0.1-0.5 micron fluoropolymer particles and an aqueous filler solution. This microcomposite powder can also be prepared by flocculating or coagulating an aqueous solution containing 0.1-0.5 micron fluoropolymer particles and a filler aqueous solution. The microcomposite powder is preferably formed into a thin film in order to obtain a thin film of an electrode or separator. These films are then assembled to form batteries.

Description

technical field [0001] The electrodes of a Li-ion battery consist of an electroactive layer which is connected to a metal layer (collector). The electroactive layer is a fluoropolymer, also known as a binder, loaded with a large amount of carbon and / or oxide therein. This fluoropolymer ensures adhesion of the electroactive layer. [0002] In the manufacture of lithium-ion batteries, the filler is typically dispersed in a solvent in the presence of a fluoropolymer binder to produce an electroactive layer containing either lithium metal oxide fillers or carbon and / or Graphite fillers, and other components for tuning electrical properties. Depositing the dispersion thus obtained on a metal current collector (gelatinization), for example by "casting" and then evaporating off the solvent, yields a negative or positive electrode, depending on the filler used. [0003] The metal collectors used are generally copper foils or grids in the case of negative electrodes and aluminum foi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08J5/00C08K3/04C08K3/22C08K3/36C08L27/12H01M4/02H01M4/60H01M4/62H01M10/40H01M50/409H01M50/443H01M50/491
CPCH01M4/621H01M4/623Y02E60/10H01M50/409Y02P70/50H01M50/491H01M50/443H01M4/60
Inventor B·巴里雷P·布斯
Owner ATOFINA
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