NASA SBIR 2017 Solicitation


PROPOSAL NUMBER: 17-2 Z1.02-9685
SUBTOPIC TITLE: Surface Energy Storage
PROPOSAL TITLE: Bifunctional Membrane for High Energy, Long Shelf Life Li-S Batteries

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Navitas Advanced Solutions Group, LLC
4880 Venture Drive Suite 100
Ann Arbor, MI 48108 - 9559
(734) 205-1434

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Dr. Hong Wang
4880 Venture Drive Suite 100
Ann Arbor, MI 48108 - 9559
(734) 205-1450

CORPORATE/BUSINESS OFFICIAL (Name, E-mail, Mail Address, City/State/Zip, Phone)
Angela Youngblood
4880 Venture Drive Suite 100
Ann Arbor, MI 48108 - 9559
(734) 205-1434

Estimated Technology Readiness Level (TRL) at beginning and end of contract:
Begin: 4
End: 6

Technology Available (TAV) Subtopics
Surface Energy Storage is a Technology Available (TAV) subtopic that includes NASA Intellectual Property (IP). Do you plan to use the NASA IP under the award?

TECHNICAL ABSTRACT (Limit 2000 characters, approximately 200 words)

The adoption of high energy lithium sulfur batteries hinges on significant improvements in charge/recharge cycle life.  Cycle life is limited by migration of dissolved polysulfide species which creates an electrochemical short circuit.  In this NASA SBIR, Navitas Systems proposes to develop an atomically precise and bifunctional membrane separator for lithium sulfur batteries that impedes polysulfide transport.  Bifunctionality will combine pore structure engineered for high capacity and selectivity to polysulfides with metal-like electronic conductivity to support electrochemical regeneration.  Phase I results showed that the proposed separator significantly improves the energy density and cycle life of lithium sulfur batteries. The Phase I proof of concept effort focused on validating the membrane materials property advantages in lab prototype cells.  Phase II will scale up production of separator using high volume roll-to-roll (R2R) coating.  Phase II will demonstrate separator robustness to automated high-speed cell assembly operations and to variation in the porous polymer substrate.  Membrane performance, cycle life, and abuse tolerance advantages will be validated in commercially relevant prototype pouch cells with at least 2Ah capacity.  Phase II technical objectives are to reduce coating thickness to <5 µm, continuously coat at least 20m of separator, demonstrate a 400 Wh/kg lithium sulfur battery cell with 200% improvement in cycle life, and show immunity to thermal runaway under NASA mission-relevant abuse testing protocols..

POTENTIAL NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
High energy lithium sulfur batteries can safely provide 500+ Wh/kg and potentially reduce the mass of energy storage systems by up to 50%. Through improving cycle life, the proposed separator advance will address the key limitation for space applications. With improved cycle life, lithium sulfur batteries will meet multi-use or cross platform space energy storage applications. Successfully deployed safe lithium-sulfur batteries would result in significant mass and volume savings and operational flexibility. Potential NASA applications include EVA space suits and tools, human example, lunar and martian landers, construction equipment, rovers, science platforms and surface solar arrays.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
If successful, the proposed technology is expected to improve LSB cycle life by >2X which will help enable adoption of batteries that double the specific energy of commercial lithium ion batteries. Initial target markets include consumer electronics, drones, and soldier portable power, with the ultimate target of meeting performance, life and cost goals for Electric Vehicle batteries.

TECHNOLOGY TAXONOMY MAPPING (NASA's technology taxonomy has been developed by the SBIR-STTR program to disseminate awareness of proposed and awarded R/R&D in the agency. It is a listing of over 100 technologies, sorted into broad categories, of interest to NASA.)

Form Generated on 03-05-18 17:24