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Production process for low-cost, long-life, high-energy anodes with five times the specific energyIntellectual Property Available to License
An advanced gas phase deposition method to make silicon/carbon composite anodes that offer five times the specific energy of those currently used in lithium-ion batteries. The process embeds nanoscale silicon particles into the graphene layers, a key to longer cycle life and improved capacity.
This approach overcomes the traditional problems associated with high energy density anodes, such as massive volume expansion, high first cycle inefficiency and severe capacity fade.
- Anodes made with this process have five times the specific energy of those made with carbon.
- When these new anodes are combined with high-energy composite cathodes, resulting batteries have more than double the energy density.
- The new process allows seamless integration with polycrystalline silicon manufacturing.
- The process allows low-cost silicon/carbon composite production.
Applications and Industries
- Electrodes used in batteries for
- Electric and plug-in hybrid electric vehicles;
- Portable electronic devices;
- Medical devices; and
- Space, aeronautical, and defense-related devices.
Proof of Concept
A protective coating that can greatly suppress the dendrite formation of lithium anodes and improve the lithium cycling stabilityIntellectual Property Available to License
Lithium metal is an attractive anode material for rechargeable batteries in terms of its extremely high theoretical capacity (3860 mAh/g) and the lowest negative potential (-3.040 V, versus the standard hydrogen electrode). However, lithium dendrite formations during electrochemical cycling cause severe capacity fade and cell failure due to electrical shorting or electrolyte consumption. This tricky problem has prevented the incorporation of lithium anodes in commercial rechargeable cells due to potential safety issues and limited cycling life.
This patent technology uses a protective coating that can greatly suppress the dendrite formation of lithium anodes and improve the lithium cycling stability. The protective coating is synthesized using a chemical vapor process that yields uniform and conformal films. The films are composed of a proprietary material that is mechanically robust to suppress lithium dendrites and has a high lithium ion conductivity and low electrical conductivity. The applications of rechargeable batteries with lithium anodes include portable devices and electric vehicles.
Divisional patent application 16/741,434