Solid Electrolyte with I-4 Crystal Structure

Technology #18423

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Inventors
Professor Gerbrand Ceder
Department of Materials Science and Engineering, MIT
External Link (web.mit.edu)
Jae Kim
Department of Materials Science and Engineering, MIT
William Richards
Department of Materials Science and Engineering, MIT
Lincoln Miara
Samsung Electronics Co, Ltd.
Naoki Suzuki
Samsung R&D Institute Japan
Yan Wang
Department of Materials Science and Engineering, MIT
External Link (www.mit.edu)
Tomoyuki Tsujimura
Samsung R&D Institute Japan
Yuichi Aihara
Samsung R&D Institute Japan
Managed By
Christopher Noble
MIT Technology Licensing Officer - Clean and Renewable Energy
Patent Protection

Solid Electrolyte with I4 Crystal Structure

US Patent Pending

Applications

Solid electrolytes with I-4 crystal structure improve the performance of lithium-ion batteries. Lithium-ion batteries are used in many applications ranging from portable electronics to electric vehicles.

Problem Addressed

Current electrolytes in lithium-ion batteries are flammable organic solvents and can be unstable. In addition to their inherent stability, solid-state electrolytes are nonflammable and may allow the use of metal anodes, increasing battery energy density considerably.

Technology

LiZnPS4 was investigated and found to be a good ionic conductor especially if the lithium content is increased beyond 1 Li per 4 S atoms. The conductivity is comparable to current solid state electrodes (5.7 x 10-4 S/cm); however, LiZnPS4 does not require expensive elements such as germanium, which is a key component of previous electrolytes. LiZnPS4 and other I4 structured materials improve Li-ion batteries by replacing flammable electrolytes, improving electrochemical stability, and decreasing production cost.

Advantages

  • Removes flammability associated with organic electrolyte
  • Improves electrochemical stability
  • Easily synthesizable