lithium metal battery Adden Energy It represents an advance over solid electrolyte battery technology, the most promising of all currently being developed. At the laboratory level, technicians from Harvard have created a button-type battery that is capable of withstanding between 5,000 and 10,000 charge and discharge cycles without losing energy capacity, thanks to the control of the formation of dendrites inside. The battery employs a special type of multilayer solid electrolyte that confines the dendrites inside.
Solid electrolyte lithium batteries have the potential to revolutionize the automotive industry. In an electric vehicle, in addition to being safer, by eliminating the flammable liquid electrolyte from conventional batteries, they increase energy density and charging speed, which brings them closer to the autonomy and charging times of combustion batteries. However they still must resolve some technical issues before they can be manufactured on an industrial scale and marketed. With a new technology for the solid electrolyte that separates the electrodes inside, the startup Adden Energy heralds a leap in performance and reliability for this type of battery.
The startup uses an exclusive license from the Harvard Office of Technology Development to develop solid-state battery systems for use in future electric vehicles. Based on the lithium metal technologythe battery can achieve charging speeds of up to three minutes with a lifespan of more than 10,000 charge and discharge cycles. Adden Energy has introduced this technology in small batteries, type button, with which the laboratory tests have been carried out. These prototypes have given very promising results that predict good performance in the next phase of the project. the company wants scale them down to a palm-sized bag cell until reaching the large format that is required for its application in large-scale electric vehicles.
“We set out to commercialize this technology because we believe it is unique compared to other solid-state batteries,” says Xin Li, an associate professor of materials science at Harvard and scientific adviser to Adden Energy. “We’ve achieved 5,000 to 10,000 charge cycles in the lab, compared to 2,000 to 3,000 cycles achieved with today’s best lithium technology, and we don’t see any fundamental limits to scaling to larger cells.”
The battery uses a new technology that prevents the formation of dendrites on lithium metal anodes. The innovation focuses on a solid-state electrolyte that allows a very high current density to be achieved without allowing the penetration of lithium dendrites. The electrolyte has a multilayer design, which structurally is made up of a less stable one sandwiched between two more stable ones. Dendrite growth occurs within the less stable electrolyte layer, but the cracks that form are rapidly filled by “dynamically generated constrained decompositions.”
According to a study published in Nature over a year ago, the cyclic performance of the lithium metal anode paired with a LiNi0.8Mn0.1Co0.1O2 cathode is very stable. Retention capacity after 20,000 cycles is greater than 82% at 20C rate. The specific power is also very high, 110.6 kW /kg, with an energy density of up to 631.1 Wh/kg. The results are far above other lithium-ion battery projects, which is why Adden Energy is confident that may have commercial samples in the next three to five years.