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Thin film alloy electrodes

A technology of thin film electrodes and mixed metals, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of lithium insertion/deintercalation reversibility deterioration, conductivity loss, etc., and achieve high energy density and high thermal stability performance and long cycle life

Inactive Publication Date: 2012-11-28
3M INNOVATIVE PROPERTIES CO
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Problems solved by technology

However, intercalation of four equivalents of lithium also produces a volume change of about almost 300%
Such drastic volume changes can lead to poor reversibility of lithium intercalation / deintercalation due to morphology changes of the composite due to expansion, as well as gaps between the current collector and the composite if the binder cannot accommodate the volume change. Conductivity loss between

Method used

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example

[0045] The preparation of the alloy melt and the performance of the battery are described below.

[0046] Example 1-Al 99 In 1 foil electrode

[0047] 20 g (0.74 moles) of 99.99% pure aluminum pellets (Alfa Aesar) were placed in a 50 ml porcelain crucible and placed in a 750°C furnace. After about 20 minutes, 0.86 g (0.0075 mole) of 99.99% pure indium was added to the molten aluminum at 750°C. The crucible and its contents were kept at 750°C for an additional 20 minutes, shaking periodically to stir the molten metal. After a total of 40 minutes the crucible contents were poured into a copper dish mold and allowed to cool to room temperature. A small piece of the hardened melt is next cut from the ingot and rolled into foil by a mechanical, manually operated rolling mill. The final thickness of the foil is between 50 μm and 100 μm.

[0048] A 2325 coin cell was constructed to test the performance of the alloy foil as a battery electrode. The negative pole is 2c...

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Abstract

Thin film alloy electrodes are provided that are useful as negative electrodes in lithium-ion electrochemical cells. The alloys include aluminum and at least one additional electrochemically active metal or composite. They can be used as a current collector or as a complete electrode.

Description

technical field [0001] The invention provides a thin film alloy electrode suitable for lithium ion electrochemical cells. Background technique [0002] Li-ion electrochemical cells are commonly used to power portable electronic devices such as mobile phones, personal computers, and personal entertainment modules. Lithium-ion batteries are currently being developed for use in electric vehicles because of their ability to provide high energy density. Some of the challenges of Li-ion battery technology are to develop batteries that have good thermal stability, cycle performance, and can be produced at a reasonable cost. [0003] Negative electrodes (anodes) for lithium-ion electrochemical cells have been developed that include certain main group metals and alloys, such as silicon and tin. The selected main group metals and alloys can be reversibly alloyed with lithium electrochemically and can provide much higher lithium storage density than carbon anode materials (commonly u...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/0525H01M4/66H01M4/48C22C21/00
CPCH01M4/505H01M10/0436Y02E60/122H01M4/525Y02T10/7011H01M4/46H01M10/052H01M4/38H01M4/386H01M4/387H01M4/463H01M6/40Y02E60/10Y02P70/50C22C21/00H01M4/66H01M10/0525Y02T10/70
Inventor 拉里·J·克劳斯洛维尔·D·詹森
Owner 3M INNOVATIVE PROPERTIES CO
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