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Current collector, electrode of electrochemical cell and electrochemical cell

A technology of battery electrodes and current collectors, applied in the field of current collectors, can solve the problems of increasing the contact resistance of metal foils of electrode active materials, reducing the capacity and energy conversion efficiency of electrochemical cells, etc.

Active Publication Date: 2015-07-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these metal foils are easily oxidized to form a passivation film, or corroded in the electrolyte to form an insulating layer, which greatly increases the contact between the electrode active material and the metal foil. resistance, thereby reducing the capacity and energy conversion efficiency of the electrochemical cell

Method used

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  • Current collector, electrode of electrochemical cell and electrochemical cell

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specific Embodiment approach 1

[0029] This embodiment provides an electrochemical battery electrode 10, the electrochemical battery electrode 10 is a lithium-ion battery electrode, and the metal foil 122 in the current collector 12 of the lithium-ion battery electrode is a positive electrode collector commonly used in existing lithium-ion batteries. Fluids such as aluminum or titanium foil. The conductive agent in the electrode material layer 14 can be one or more of carbon fibers, acetylene black and carbon nanotubes; the binder can be one of PVDF, polytetrafluoroethylene (PTFE) and SBR or more; the electrode active material is a positive electrode active material, and the positive electrode active material can be a positive active material commonly used in existing lithium-ion batteries. The positive electrode active material can be undoped or doped spinel lithium manganate, layered lithium manganate, lithium nickelate, lithium cobaltate, lithium iron phosphate, lithium nickel manganese oxide and lithium ...

specific Embodiment approach 2

[0031] The difference between this embodiment and the electrochemical cell electrode 10 of Embodiment 1 above is that the metal foil 122 is a negative current collector commonly used in existing lithium-ion batteries, such as copper foil or nickel foil. The electrode active material in the electrode active material layer 14 is a negative electrode active material. The negative electrode active material is natural graphite, organic pyrolysis carbon or mesocarbon microspheres (MCMB) and the like.

[0032]Since the metal foil in the current collector is covered by a graphene film, when the current collector is in use, the graphene film blocks the direct contact between the metal foil and the corrosive electrolyte, thereby preventing electrolysis The corrosion reaction between the liquid and the metal foil prevents the metal foil from being corroded, and reduces the influence of corrosion products on the contact resistance between the current collector and the electrode material l...

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Abstract

A current collector includes a metal foil and a graphene film coated on a surface of the current collector. An electrode of an electrochemical battery includes the current collector and an electrode active material layer coated on a surface of the current collector. An electrochemical battery is also provided which including the electrode.

Description

technical field [0001] The invention relates to a current collector, an electrode of an electrochemical cell using the current collector and an electrochemical cell using the electrode of the electrochemical cell. Background technique [0002] The current collector is an important main component of an electrochemical cell. In electrochemical cells, the surface of the current collector usually carries electrode active materials and contacts the electrolyte, which can provide electron channels for electrochemical reactions to accelerate electron transfer, and transport electrons to external circuits to form currents. Therefore, the performance of the current collector is closely related to the performance of the electrochemical cell. [0003] Existing current collectors are usually made of conductive metal foils, such as copper foil and aluminum foil. However, these metal foils are easily oxidized to form a passivation film, or corroded in the electrolyte to form an insulati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/13H01M10/0525
CPCH01M4/661Y02E60/122H01M4/667H01M4/663H01M10/0525H01M4/13Y02E60/10H01M10/052
Inventor 何向明王莉李建军郭建伟任建国
Owner TSINGHUA UNIV
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