Intermediate layers for electrode fabrication

An intermediate layer and electrode technology, used in the manufacture of electrodes containing one or more intermediate layers, the manufacture of battery electrodes for lithium-ion batteries, and the field of nickel silicide, which can solve problems such as electrical connection loss

Inactive Publication Date: 2012-09-19
AMPRIUS INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most polymer binders are not elastic enough to accommodate the expansion of the active material, which leads to the separation between the polymer and t

Method used

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  • Intermediate layers for electrode fabrication
  • Intermediate layers for electrode fabrication
  • Intermediate layers for electrode fabrication

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Embodiment Construction

[0022] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be practiced without some or all of these specific details. In other instances, well known process operations have not been described in detail in order not to unnecessarily obscure the present invention. While the invention will be described in conjunction with specific embodiments, it will be understood that it is not intended to limit the invention to the described embodiments.

[0023] introduction

[0024] Instead of using polymeric binders to bond the active materials to the substrate as is routinely done in Li-ion battery fabrication, the active materials can be deposited or otherwise made during their fabrication (thus creating a "growth-fixed" active material) or bonded directly to the current-collecting substrate after its manufacture (by, for example, sintering or otherwise fusing). In certai...

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Abstract

Provided are novel electrodes for use in lithium ion batteries. An electrode includes one or more intermediate layers positioned between a substrate and an electrochemically active material. Intermediate layers may be made from chromium, titanium, tantalum, tungsten, nickel, molybdenum, lithium, as well as other materials and their combinations. An intermediate layer may protect the substrate, help to redistribute catalyst during deposition of the electrochemically active material, improve adhesion between the active material and substrate, and other purposes. In certain embodiments, an active material includes one or more high capacity active materials, such as silicon, tin, and germanium. These materials tend to swell during cycling and may loose mechanical and/or electrical connection to the substrate.; A flexible intermediate layer may compensate for swelling and provide a robust adhesion interface. Provided also are novel methods of fabricating electrodes containing one or more intermediate layers.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 260,297, filed November 11, 2009, entitled "Intermediate Layers for Electrode Fabrication," which is hereby incorporated by reference in its entirety for all purposes. Background technique [0003] High capacity rechargeable batteries are highly desired. Many application areas, such as aerospace, medical devices, portable electronics, and automotive, require high-mass ratio and / or volume-specific capacity batteries. Lithium-ion battery technology represents a significant improvement in this regard. However, to date, the application of this technology has been mainly limited to graphite electrodes, which have a theoretical capacity of only about 372 mAh / g during lithiation. [0004] Silicon, germanium, tin and many other materials are attractive active materials because of their high electrochemical capacity. For example, the theoretical capacity ...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M4/36H01M10/0525B82B3/00
CPCY02E60/12Y02E60/122H01M4/661H01M4/1395H01M4/13H01M10/052H01M4/366H01M4/134Y02E60/10B82B3/00H01M4/02H01M4/04H01M10/0525
Inventor W·S·德尔哈根R·J·法辛G·E·洛夫尼斯韩松E·M·伯迪柴夫斯基C·I·斯蒂芬崔屹M·C·普拉特申
Owner AMPRIUS INC
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