High Energy Density Semi-Solid Storage Electrodes and Batteries Thereof

Technology #16204

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FIG. 3 provides cross-sectional illustrations and plots comparing a conventional energy storage device and an energy storage device according to some embodiments of the inventionFIG. 4 provides images showing the microstructure of a current collector from a conventional energy storage device] FIG. 5 provides images showing the microstructure of conductive particles in an energy storage device according to some embodiments of the invention
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Inventors
Professor Yet-Ming Chiang
Department of Materials Science and Engineering, MIT
External Link (dmse.mit.edu)
Professor Craig Carter
Department of Materials Science and Engineering, MIT
External Link (dmse.mit.edu)
Professor Gareth McKinley
Department of Mechanical Engineering, MIT
External Link (web.mit.edu)
Kyle Smith
Health Science and Technology, MIT-Harvard
William Woodford
Department of Materials Science and Engineering, MIT
Zheng Li
Department of Materials Science and Engineering, MIT
Frank Fan
Department of Materials Science and Engineering, MIT
Nir Baram
Department of Materials Science and Engineering, MIT
Ahmed Helal
Department of Mechanical Engineering, MIT
Managed By
Christopher Noble
MIT Technology Licensing Officer - Clean and Renewable Energy
Patent Protection

METAL SULFIDE ELECTRODES AND ENERGY STORAGE DEVICES THEREOF

US Patent Pending 2014-0302370

METAL SULFIDE ELECTRODES AND ENERGY STORAGE DEVICES THEREOF

US Patent Pending

Applications

Through this technology, flow batteries exhibit about 5 times the capacity of their conventional design. These improved flow cells can be used for applications ranging from load balancing to electric vehicles.

Problem addressed

Currently, the electrochemical reaction in flow batteries only occurs on the surface of the electrodes. This design allows the reaction to occur throughout the volume of the electrode, and improves the battery capacity and reversibility when cycled to include the precipitation regime.

Technology

The design of these flow electrodes combines redox active solution electrodes and active solid electrodes, forming suspensions of the latter in the former. These suspensions are percolating networks in the flowable redox solutions created by diffusion-limited aggregation. This creates an “infinite current collector” network that allows the electrochemical reaction to be carried out throughout the volume of an electrode. These networks can be created with the storage particles and/or additive materials that are electronically conductive. This design increases the electroactive area by 103 while providing sufficient electronic conductivity and retaining flowability. Currently, reversibility limitations are attributed to thick layers of insulating lithium disulfide (Li2S2) and lithium sulfide (Li2S) on the electrodes. The greater surface area of this design allows an equivalent volume of Li2S2 and Li2S to deposit as a thinner layer, which reduces transfer resistance and increases reversibility.  For identical solutions, cell geometry, and electrochemical test conditions, the cell with nanoconductor suspension exhibits 5 times the capacity of the conventional flow cell design, and reached the theoretical capacity of the solution.

Advantages

  • Increased flow battery capacity
  • Increased flow battery reversibility