Saft has been awarded a major contract by the Brazilian power utility CEB (Companhia Energetica de Brasilia) to design, manufacture and supply maintenance-free nickel backup battery systems for all 34 distribution substations serving Brasilia, the country's capital city. The Saft Uptimax batteries Contact online >>
Saft has been awarded a major contract by the Brazilian power utility CEB (Companhia Energetica de Brasilia) to design, manufacture and supply maintenance-free nickel backup battery systems for all 34 distribution substations serving Brasilia, the country''s capital city. The Saft Uptimax batteries are replacing the existing lead-acid batteries at the CEB substations to provide a significant increase in reliability and availability while reducing battery maintenance and replacement costs.
Brasilia is the Federal Capital of Brazil and the seat of government for the country''s Federal District. CEB controls electric power distribution, generation and transmission assets covering an area of more than 5,280 square kilometers, providing service to more than 990,000 clients and nearly 2.9 million residents.
The substation backup batteries play a critical role for CEB by ensuring a continuous 125 V supply to support all the auxiliary loads such as switchgear, automation and protection circuits for up to 10 hours if there is an interruption to the main power supply. Previously, the substations have been fitted with lead-acid batteries. However, this is a particularly demanding application with ambient temperatures reaching 35°C that contribute to the risk of unpredictable, premature battery failure.
To ensure total reliability of its backup systems CEB has now implemented a one-year program to replace the batteries at all 34 of its distribution substations with Saft Uptimax batteries. These batteries feature Saft''s latest development in nickel pocket plate technology that delivers maintenance-free operation with a long, completely predictable service life even at elevated temperatures.
"Ensuring continuity of customer supply is a mission critical aspect of CEB''s power distribution business. That''s why we have made the decision to purchase nickel backup batteries for the first time in our company history", said Arthur Franklin, Substations maintenance manager of CEB. "This switch to Saft batteries gives us renewed confidence that our substation backup systems will always perform as required, whenever they are called upon."
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Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have developed a new lithium metal battery that can be charged and discharged at least 6,000 times — more than any other pouch battery cell — and can be recharged in a matter of minutes.
Lithium metal batteries could offer far better energy density and much lower weight than lithium-ion technology thanks to the replacement of heavier graphite with lithium metal as anode. However, one of the biggest challenges in the design of these batteries is the formation of dendrites on the anode''s surface, causing the battery to rapidly degrade, short, and even catch fire.
Researchers at Harvard John A. Paulson SEAS have developed a new lithium metal battery that withstand at least 6,000 charging cycles and can be recharged in a matter of minutes.
Their research not only describes a new way to make solid state batteries with a lithium metal anode but also offers new understanding into the interface reaction between lithium and materials at the anode in these type of batteries.
"Lithium metal anode batteries are considered the holy grail of batteries because they have ten times the capacity of commercial graphite anodes and could drastically increase the driving distance of electric vehicles," said Xin Li, Associate Professor of Materials Science at SEAS and senior author of the paper. "Our research is an important step toward more practical solid-state batteries for industrial and commercial applications."
In 2021, Li and his team offered one way to deal with dendrites by designing a multilayer battery that sandwiched different materials of varying stabilities between the anode and cathode. This multilayer, multi-material design prevented the penetration of lithium dendrites not by stopping them altogether, but rather by controlling and containing them.
In the new research, Li and his team stop dendrites from forming by using micron-sized silicon particles in the anode to constrict the lithiation reaction and facilitate homogeneous plating of a thick layer of lithium metal.
In this design, when lithium ions move from the cathode to the anode during charging, the lithiation reaction is constricted at the shallow surface and the ions attach to the surface of the silicon particle but do not penetrate further.
About Brasilia solid-state batteries
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