Development of novel strategies for enhancing the cycle life of lithium solid polymer electrolyte batteries. Final report

Technical Report · Mon Apr 30 00:00:00 EDT 2001

DOI:https://doi.org/10.2172/810692· OSTI ID:810692

Macdonald, Digby D; Urquidi-Macdonald, Mirna; Allcock, Harry; Engelhard, George; Bomberger, N; Gao, L; Olmeijer, D

Lithium/solid polymer electrolyte (Li/SPE) secondary batteries are under intense development as power sources for portable electronic devices as well as electric vehicles. These batteries offer high specific energy, high energy density, very low self-discharge rates, and flexibility in packaging; however, problems have inhibited their introduction into the marketplace. This report summarizes findings to examine processes that occur with Li/SPE secondary batteries upon cyclic charging/discharging. The report includes a detailed analysis of the impedance measured on the Li/SPE/IC and IC/SPE/IC systems. The SPE was a derivative of methoxyethoxyethoxyphosphazene (MEEP) with lithium triflate salt as the electrolyte, while the intercalated cathodes (IC) comprised mixtures of manganese dioxide, carbon powder, and MEEP as a binder. Studies on symmetrical Li/SPE/Li laminates show that cycling results in a significant expansion of the structure over the first few tens of cycles; however, no corresponding increase in the impedance was noted. The cycle life of the intercalation cathode was found to be very sensitive to the method of fabrication. Results indicate that the cycle life is due to the failure of the IC, not to the failure of the lithium/SPE interface. A pattern recognition neural network was developed to predict the cycle life of a battery from the charge/discharge characteristics.

• Research Organization: The Pennsylvania State University, University Park, PA (US)
• Sponsoring Organization: Division of Chemical Sciences, Office of Basic Energy Sciences, USDOE Office of Energy Research (ER)
• DOE Contract Number: FG02-93ER14387
• OSTI ID: 810692
• Report Number(s): DOE/ER/14387-1; TRN: US200716%%537
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
CARBON
CATHODES
ELECTRIC BATTERIES
ELECTROLYTES
ENERGY DENSITY
FABRICATION
FLEXIBILITY
IMPEDANCE
LITHIUM
MANGANESE
METAL-NONMETAL BATTERIES
MIXTURES
NEURAL NETWORKS
PATTERN RECOGNITION
POLYMERS
SERVICE LIFE
SOLAR PROTONS
SOLID ELECTROLYTES
CLATHRATES
FAILURES
PROGRESS REPORT AROMATICS
FORECASTING