Propelling Research to a Practical Level: New Challenges in High Energy Density Li-S Battery

Primary author: Shuo Feng
Faculty sponsor: Yuehe Lin

Primary college/unit: Voiland College of Engineering and Architecture
Campus: Pullman

Abstract:

Lithium-sulfur battery (Li-S) has been intensively studied in the past years due to its high theoretical energy density and economic benefit. However, there are still several obstacles that greatly limit its practical application such as low conductivity, large volume change and polysulfides shuttling. It is widely reported that nano materials can solve these problems and significantly improve batteries’ performance. Despite the efforts, many of the results are derived from an ideal condition, that is, a low sulfur loading ( 10 µL/mgs). The insufficient active materials as well as the large amount of electrolyte not only results in a low practical energy density but also glosses over some challenges in Li-S batteries. Hence, a high sulfur loading cathode (>4 mg/cm2) and a lean electrolyte condition (= 4 µL/mgs) should be determined in order to deliver repeatable results and reliable conclusions. In this poster, we demonstrate various strategies to achieve high energy density Li-S battery and elucidate the new challenges in this field. Moreover, by investigating the distinct phenomenon under flooded and lean electrolyte condition, we develop a reasonable test protocol and propel Li-S battery research to a practical level.

This work was supported in part through the PNNL-WSU Distinguished Graduate Research Program (SF).

Thermal performance of a novel masonry block made from recycled gypsum drywall waste

Primary author: David Drake
Co-author(s): Taiji Miyasaka

Primary college/unit: Voiland College of Engineering and Architecture
Campus: Pullman

Abstract:

Developing new product applications for waste recycled from building construction and demolition (C&D) provides environmental and economic benefits. However, challenges remain for recycling certain low-value C&D materials, such as gypsum drywall waste, which is banned from landfilling in some areas due to hydrogen sulfide emissions during decay. The gypsum and paper components in drywall have low thermal conductivity relative to concrete and brick, suggesting a novel insulative masonry block system made from recycled gypsum drywall waste could have higher thermal performance than conventional concrete masonry units (CMU). The authors have developed such a system, referred to as Drywall Waste Block (DWB), and have previously published investigations of DWB engineering properties including compressive strength, water absorption, bulk density, and thermal conductivity. This paper describes investigation of resistance to heat flow of a reinforced DWB wall assembly, using a calibrated hot box apparatus as specified in ASTM C1363-11. The hot box apparatus was designed and fabricated as a cost-effective alternative to commercially testing services, affording rapid iteration during the research and development phase of novel building products made from unconventional materials. Some aspects of the apparatus design, fabrication, and characterization are discussed. Thermal performance of the DWB wall relative to a comparable CMU wall is discussed, as are areas for further research.

Discovery and development of a multi-tenant engagement program for a Net-Zero building in Spokane, WA

Primary author: Julia Day
Co-author(s): Shelby Ruiz

Primary college/unit: Voiland College of Engineering and Architecture
Campus: Pullman

Abstract:

The Catalyst Building is part of the first phase of a Spokane re-development project and city-wide sustainability initiative. This pioneering project, expected to be completed in May 2020, will be the first net-zero energy and zero carbon building in Eastern Washington state. While many state-of-the-art and innovative energy-saving and carbon-reducing technologies have been implemented into the design (e.g. cross-laminated timber, shared central plant / eco-district, etc.), the owners realize that building occupants play a critical role in achieving aggressive energy goals. The authors have been tasked with the development of a tenant engagement and education program for the multi-tenanted Catalyst building to promote energy efficiency, health, and community within the project. These efforts will encourage a culture of energy efficiency and sustainability for Catalyst building occupants in ways that will positively impact the South Landing Development. As part of this program, tenants will learn strategies to save energy within the building and their community (e.g. human-building interface and interaction with energy usage including heating/cooling, plug loads, lighting, bicycle commuting, etc.)
This poster presents findings from an extensive literature review that was conducted to guide the development of the Catalyst Building tenant engagement program. Key topics include social science and behavioral change theories, occupant/tenant engagement strategies (such as technology and gamification), effective occupant and adult education, and best-practices case studies. These findings have guided the development of a robust tenant engagement program for the South Landing District to maximize net zero energy and zero carbon goals.