The Science of Electrode Materials for Lithium Batteries

Fultz, Brent

California Institute of Technology

关键词: Research Programs;    25 Energy Storage;    Lithium, Battery, Nanophase Anode, Cathode, Tem, Cycle Lifetimes, Phase Stability, Electrode Materials, Olivine, Lifepo4, Cicoo2, Eels,;    Energy Sources;    Electrodes;   

DOI  :  10.2172/900899
RP-ID  :  DOE/ER/15035-1
RP-ID  :  FG02-00ER15035
RP-ID  :  900899

美国|英语

来源: UNT Digital Library

【 摘 要 】

Rechargeable lithium batteries continue to play the central role in power systems for portable electronics, and could play a role of increasing importance for hybrid transportation systems that use either hydrogen or fossil fuels. For example, fuel cells provide a steady supply of power, whereas batteries are superior when bursts of power are needed. The National Research Council recently concluded that for dismounted soldiers "Among all possible energy sources, hybrid systems provide the most versatile solutions for meeting the diverse needs of the Future Force Warrior. The key advantage of hybrid systems is their ability to provide power over varying levels of energy use, by combining two power sources." The relative capacities of batteries versus fuel cells in a hybrid power system will depend on the capabilities of both. In the longer term, improvements in the cost and safety of lithium batteries should lead to a substantial role for electrochemical energy storage subsystems as components in fuel cell or hybrid vehicles. We have completed a basic research program for DOE BES on anode and cathode materials for lithium batteries, extending over 6 years with a 1 year phaseout period. The emphasis was on the thermodynamics and kinetics of the lithiation reaction, and how these pertain to basic electrochemical properties that we measure experimentally — voltage and capacity in particular. In the course of this work we also studied the kinetic processes of capacity fade after cycling, with unusual results for nanostructued Si and Ge materials, and the dynamics underlying electronic and ionic transport in LiFePO4. This document is the final report for this work.