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Improved high capacity rechargeable battery

A lithium-ion battery, electrode technology, applied in the field of improved high-capacity rechargeable batteries

Active Publication Date: 2021-06-29
COMPOSITE MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This in turn produces a substantially more homogeneous capacitor material, resulting in significantly higher values ​​of CV / g

Method used

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  • Improved high capacity rechargeable battery
  • Improved high capacity rechargeable battery
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Embodiment Construction

[0040] refer to figure 1 with figure 2, the production process begins in step 10 with the manufacture of a valve wire, preferably tantalum, by combining a filament or wire of tantalum with a malleable material such as copper to form a billet. The billet is then sealed in an extrusion vessel in step 12 and extruded and drawn in step 14 in accordance with the teachings of the inventor's '196 patent. The extruded and drawn filament is then cut or shredded at cutting station 16 into short segments typically 1 / 16 inch to 1 / 4 inch long. Preferably, the cutting filaments all have approximately the same length. In fact, the more uniform the filaments, the better. The chopped filaments are then sent to etching station 18 where the ductile metal is leached out using a suitable acid. For example, where copper is a ductile metal, the etchant may contain nitric acid.

[0041] The copper between the tantalum wires is removed by acid etching. After etching, a number of short tantalum ...

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Abstract

Electroactive electrode materials for lithium ion batteries, lithium ion batteries, and methods for forming electrochemically active electrode materials are described. The electrode material is in the form of a sheet or pad formed of a valve metal material formed from filaments of valve metal having a cross-section no greater than about 10 microns and coated with an electrochemically active material such as silicon nanoparticles.

Description

Background technique [0001] Demand for high-capacity rechargeable batteries is strong and growing every year. Many applications such as aerospace, medical devices, portable electronics, and automotive applications require batteries with high gravimetric and / or volumetric capacity. Lithium-ion electrode technology could provide a major improvement in this regard. However, to date, Li-ion batteries using graphite are limited to a theoretical specific energy density of 372 mAh / g. [0002] Silicon, germanium, tin and many other materials are attractive active materials because of their high electrochemical capacity. For example, silicon has a theoretical capacity of about 4200mAh / g, which corresponds to Li 4 .4Si phase. However, many of these materials are not widely used in commercial lithium-ion batteries. One reason is that some of these materials exhibit significant volume changes during cycling. Silicon, for example, expands by as much as 400 percent when charged to its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/74H01M4/13H01M4/134H01M4/36
CPCH01M4/134H01M4/0404H01M4/1395H01M4/386H01M4/661H01M10/0525H01M4/74H01G11/06H01G11/26H01G11/28H01G11/70H01G11/68Y02E60/10H01M4/387H01M4/662H01M2004/027
Inventor 詹姆斯·翁大卫·弗罗斯特
Owner COMPOSITE MATERIALS TECH