Dissertation/Thesis Abstract

Plug-in hybrid electric vehicles: battery degradation, grid support, emissions, and battery size tradeoffs
by Peterson, Scott B., Ph.D., Carnegie Mellon University, 2012, 189; 3520120
Abstract (Summary)

Plug-in hybrid electric vehicles (PHEVs) may become a substantial part of the transportation fleet in a decade or two. This dissertation investigates battery degradation, and how introducing PHEVs may influence the electricity grid, emissions, and petroleum use in the US. It examines the effects of combined driving and vehicle-to-grid (V2G) usage on lifetime performance of commercial Li-ion cells. The testing shows promising capacity fade performance: more than 95% of the original cell capacity remains after thousands of driving days. Statistical analyses indicate that rapid vehicle motive cycling degraded the cells more than slower, V2G galvanostatic cycling. These data are used to examine the potential economic implications of using vehicle batteries to store grid electricity generated at off-peak hours for off-vehicle use during peak hours. The maximum annual profit with perfect market information and no battery degradation cost ranged from ∼US$140 to $250 in the three cities. If measured battery degradation is applied the maximum annual profit decreases to ∼$10-120. The dissertation predicts the increase in electricity load and emissions due to vehicle battery charging in PJM and NYISO with the current generators, with a $50/tonne CO2 price, and with existing coal generators retrofitted with 80% CO2 capture. It also models emissions using natural gas or wind+gas. We examined PHEV fleet percentages between 0.4 and 50%. Compared to 2020 CAFE standards, net CO2 emissions in New York are reduced by switching from gasoline to electricity; coal-heavy PJM shows smaller benefits unless coal units are fitted with CCS or replaced with lower CO2 generation. NOX is reduced in both RTOs, but there is upward pressure on SO2 emissions or allowance prices under a cap. Finally the dissertation compares increasing the all-electric range (AER) of PHEVs to installing charging infrastructure. Fuel use was modeled with National Household Travel Survey and Greenhouse Gasses, Regulated Emissions, and Energy Use in Transportation model. It was found that increasing AER of plug-in hybrids was a more cost effective solution to reducing gasoline consumption than installing charging infrastructure. Comparison of results to current subsidy structure shows various options to improve future PHEV or other vehicle subsidy programs.

Indexing (document details)
Advisor: Apt, Jay, Whitacre, Jay F.
School: Carnegie Mellon University
School Location: United States -- Pennsylvania
Source: DAI-A 73/11(E), Dissertation Abstracts International
Subjects: Environmental economics, Public policy, Sustainability, Energy
Keywords: Battery degradation, Electricity grids, Hybrid electric vehicles, Lithium-ion batteries, Vehicle emissions
Publication Number: 3520120
ISBN: 978-1-267-51753-1
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