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Increase Life and Capacity of Li-Ion Batteries

Technology #20180423

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Silicon-based active materialsSelf-optimization process
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Researchers
Jeong-Hyun Cho, PhD
Assistant Professor, Electrical and Computer Engineering
External Link (ece.umn.edu)
Managed By
Larry Micek
Technology Licensing Officer 612-624-9568
Patent Protection

Provisional Patent Application Filed

Reduce charge cycle volume change

A self-optimization process for preparing ion battery electrodes significantly reduces the volume change of silicon (Si) anode materials during full charging and discharging cycles. The self-optimization process, realized by lithiation and delithiation under optimized bias voltages and cycling speed, generates internal voids within active materials resulting in a minimum volume change. Long-term cyclability is enhanced by depositing an aluminum oxide passivation layer on the surface of the self-optimized active materials. The self-optimization process and coating can be applied to any anode and cathode active materials showing high volume change during charging and discharging. The cost-effective process can be integrated into production lines for mass production.

Long-term cyclability

Silicon-based anode materials for advanced lithium-ion battery applications suffer from short-term cyclability due to consumption of the active material with increasing charging/discharging (lithiation/delithiation) cycles. Due to the large volume change of Si anodes, the commonly used passivation layer is not applicable. This new self-optimization process reduces the volume change of anode materials from 400% to less than 1%, with full charge and discharge cycles, resulting in long-term cyclability without scarifying a high specific capacity of the Si anode materials.

Phase of Development

  • Proof of concept. Prototype self-optimization process developed and demonstrated using in-situ electron microscope.

Benefits

  • Economic process is self-optimizing
  • Cost-effective process can be integrated into production lines for mass production

Features

  • Electrode life and capacity increased by reducing volume change of Si to less than 1%
  • Can be applied to any anode and cathode active materials showing high volume change during charging and discharging
  • Aluminum oxide passivation layer deposited on the self-optimized active materials prevents continuous consumption of active materials by solid-electrolyte interphase (SEI) formation

Applications

  • Lithium ion batteries
  • Lithium battery electrode materials


Interested in Licensing?
The University relies on industry partners to scale up technologies to large enough production capacity for commercial purposes. The license is available for this technology and would be for the sale, manufacture or use of products claimed by the issued patents. Please contact Larry Micek to share your business needs and technical interest in this technology and if you are interested in licensing the technology for further research and development.