![]() ![]() The results are well above other Li-Ion battery projects, and Adden Energy is confident it can have commercial samples in the next three-to-five years. The specific power is also impressive, at 110.6 kW/kg, with an energy density up to 631.1 Wh/kg. The capacity retention after 20,000 cycles is above 82% at a 20C rate. The electrolyte features a “multilayer design, which has the structure of a less-stable electrolyte sandwiched between more-stable solid electrolytes.” The dendrite growth happens inside the less stable electrolyte layer, but any cracks formed are quickly filled by “dynamically generated decompositions that are also well constrained.”Īccording to a study published in Nature more than a year ago, the cycling performance of the lithium metal anode paired with a LiNi0.8Mn0.1Co0.1O2 cathode is very stable. ![]() The innovative solid-state electrolyte is essential to this technology, allowing it to achieve an ultrahigh current density with no lithium dendrite penetration. The battery uses a new technology that prevents dendrite formation in the lithium-metal anodes. Adden Energy is preparing a commercially deploy solid-state battery systems for electric. “We have achieved in the lab 5,000 to 10,000 charge cycles in a battery’s lifetime, compared with 2,000 to 3,000 charging cycles for even the best in class now, and we don’t see any fundamental limit to scaling up our battery technology. Solid state battery (courtesy Second Bay Studios Harvard SEAS). “We set out to commercialize this technology because we do see our technology as unique compared to other solid-state batteries,” said Xin Li, Associate Professor of Materials Science at Harvard and scientific advisor to Adden Energy. Still, Adden wants to scale the battery up to a palm-sized pouch cell and further to a full-scale EV battery. The coin-cell prototypes developed by Adden Energy for lab testing don’t look like much now. Based on lithium-metal technology, the battery can achieve charge rates as fast as three minutes with over 10,000 cycles in a lifetime. The cycling performance of the lithium metal anode paired with a LiNi0.8Mn0.1Co0.1O2 cathode showed an 82% capacity retention after 10,000 cycles at a 20C rate (8.6 mA/cm2) and 81.3% capacity retention after 2000 cycles at a 1.5C rate (0.64 mA/cm2).The startup uses an exclusive technology license from Harvard’s Office of Technology Development to develop solid-state battery systems for use in future electric vehicles. Any cracks are filled by dynamically generated decompositions that are also constrained in the less stable layers. The multi-layer design has the structure of a less stable electrolyte sandwiched between more stable solid electrolytes, which prevents any lithium dendrite growth as the stable electrolyte layer decomposes. Instead, the researchers use a hierarchy of layers in the battery to achieve a high current density with no lithium dendrite penetration. That can lead to shorter battery life, but also to short-circuits that can cause fires. Tiny cracks in the ceramic layers can be generated during battery assembly or long-time cycling, and once these cracks form, lithium dendrite penetration is inevitable. “As a result, the device can sustain its high performance over a long lifetime.” We defeat the growth of dendrites before they can cause damage,” said Luhan Ye, researcher at Harvard, who is now chief technology officer of Adden Energy. ![]() “Typically, lithium metal anodes in other solid-state designs develop dendrites – twig-like growths that can gradually penetrate through the electrolyte to the cathode. The lithium metal solid-state cell has a specific power of 110.6 kW/kg and a specific energy of up to 631.1 Wh/kg. We have achieved 5000 to 10,000 charge cycles in the lab in a battery’s lifetime, compared with 2000 to 3000 charging cycles for even the best in class now, and we don’t see any fundamental limit to scaling up our battery technology. “We set out to commercialise this technology because we see it as unique compared to other solid-state batteries. “If you want to electrify vehicles, a solid-state battery is the way to go,” said Xin Li, a scientific advisor to Adden Energy and Associate Professor of Materials Science at the Harvard John A Paulson School of Engineering and Applied Sciences. The design tackles the problem of lithium dendrites that grow with fast charging and reduce the lifetime. High energy long life rechargeable battery is considered as key enabling technology for deep de-carbonization. The technology, which has a lifetime of 10,000 cycles, has been licensed by Harvard University to Adden Energy to scale up to pouch and then prismatic cells for EV designs in the next 3 to 5 years. Researchers in the US have developed a solid-state lithium metal battery for use in future EVs that would fully charge in as little as 3 minutes (writes Nick Flaherty).
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