EEStor, the developer of a new high-power-density ceramic ultracapacitor (the Energy Storage Unit—EESU), has broken a long public silence and announced reaching two key production milestones. First, its automated production line has been proven to meet the requirements for precise chemical delivery, purity control, parameter control and stability.
Second, EEStor has completed the initial milestone of certifying purification, concentration, and stability of all of its key production chemicals—notably the attainment of 99.9994% purity of its barium nitrate powder.
The independent 3rd party chemical analysis was completed by Southwest Research Institute, Inc. located in San Antonio, Texas under contract with EEStor, Inc.
With these milestones completed, EEStor is now in the process of producing composition-modified barium titanate powders on its automated production line, and is moving toward completing its next major milestone of powder certification.
The company anticipates that the relative permittivity of the current powder will either meet and/or exceed 18,500, the previous level achieved when EEStor produced prototype components using it engineering level processing equipment.
The EEStor ESU is projected to offer up to 10x the energy density (volumetric and gravimetric) of lead-acid batteries at the same cost. In addition, the ESU is projected to store up to 1.5 to 2.5 times the energy of Li-Ion batteries at 12 to 25% of the cost.
According to the company’s initial patent, the EESU is based on a high-permittivity composition-modified barium titanate ceramic powder. This powder is double coated with the first coating being aluminum oxide and the second coating calcium magnesium aluminosilicate glass.
The EESU alternates multilayers of nickel electrodes and the high-permittivity powder. The resulting parallel configuration of components has the capability to store electrical energy in the range of 52 kWh, according to the document, with weight for a unit of that capacity in the range of 336 pounds (152 kg).
According to EEStor, the EESU will not degrade due to being fully discharged or recharged, and also can be rapidly charged without damaging the material or reducing its life. The cycle time to fully charge a 52 kWh EESU would be in the range of 4 to 6 minutes with sufficient cooling of the power cables and connections.
The first commercial application of the EESU is intended to be used in electric vehicles under a technology agreement with ZENN Motors Company. (Earlier post.) EEStor says that it remains on track to begin shipping production 15 kWh Electrical Energy Storage Units (EESU) to ZENN Motor Company in 2007 for use in their electric vehicles.
The production EESU for ZENN Motor Company is designed to function to specification in operating environments as severe as -20° to +65° degrees Celsius, will weigh less than 100 pounds, and will have ability to be recharged in a matter of minutes.