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Tabacchi – NETL, Singh – 3M III.B.4 High Energy Novel Cathode/Alloy Automotive Cell Figure III - 62: Stable voltage curve than pure O2 loss cathode Anode Material Development. The team successfully developed a new Si anode composition, studied parameters for process optimization and scaled up material production. L20772 was down selected and is being tested for performance optimization. Key parameters to improve the performance of Si anode composite were also studied. One of key findings was the effect of particle size on the electrode expansion, as shown in Figure III - 63. Small particle (micron level) size and optimum electrode composite formulation are key for lower electrode expansion, at same mAh/cc. Nano Si electrode composite shows significantly high expansion compared to small particle size. High precision measurements using in situ isothemal calorimetry were also performed on Si composite electrodes. Figure III - 64 shows the significance of flake graphite to overcome electrical network failure. Figure III - 63: Si composite electrode expansion vs. particle size Figure III - 64: Calorimetry to characterize electrical network failure mechanisms Electrolyte Development. A new electrolyte with significant improvement in cycle life of NMC||Si cell design was discovered (see Figure III - 65). Cell Development. The advantage of the core shell cathode and Si anode is shown in Figure III - 66. The matched irreversible capacity helps to prevent the anode from going to a high potential during the bottom of full cell discharge. FY 2013 Annual Progress Report 77 Energy Storage R&DPDF Image | Advanced Battery Development
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