![]() At the discharge rate of 1.5C (0.64mAcm-2) and 20C (8.6mAcm-2), the capacity retention rate reached 81.3% and 82% after 200 cycles. The technology not only improves safety, but also shows excellent cycling performance with lithium metal as the negative electrode and LiNi0.8Mn0.1Co0.1O2 as the positive electrode. The solid electrolyte layer in the middle of the sandwich prevents lithium dendrites from piercing the entire battery, preventing a short circuit or even a fire at the anode and cathode. Once cracks are formed, lithium dendrite penetration and short circuit are unavoidable. Usually lithium metal solid state batteries are charged and discharged repeatedly, and micron or submicron cracks frequently occur in ceramic particles. Lithium dendrites can pass through graphite and the first electrolyte layer, but are intercepted when they reach the second electrolyte layer. The intermediate electrolyte can be replaced with Li9.54Si1.74(P0.9Sb0.1)1.44S11.7Cl0.3(LSPS) to obtain similar performance. The second electrolyte sandwiched in the middle is Li10Ge1P2S12 (LGPS), which is less stable to lithium metal, but not easy to penetrate lithium dendrite. ![]() Its presence can stabilize the main interface between lithium metal and graphite layers and reduce the overall overpotential. As described in the paper, the first solid electrolyte sandwicketed on both sides is Li5.5PS4.5Cl1.5 (LPSCI), which is characterized by its stable performance to lithium metal, but is prone to lithium dendrite penetration. Graphite lies between the anode of lithium metal and the first solid electrolyte layer, and is mainly used for heat insulation. The multilayer design of the battery is characterized by sandwiched unstable electrolyte between stable solid electrolyte, forming a “sandwich” structure, and by achieving good local decomposition of cracks in the unstable electrolyte layer, the growth of any lithium dendrites is inhibited.Īs shown in the figure above, from left to right, the “sandwich” battery structure is distributed as lithium metal negative electrode → graphite →LPSCI→LGPS→LPSCI→ single crystal LiNi0.8Mn0.1Co0.1O2 (nickelmanganese Cobalt 811) positive electrode. ![]() In the paper, the researchers report that they have fabricated a multilayer lithium-metal solid state battery with interfacial stability, thus achieving stable cycling at ultra-high current densities and inhibiting dendrite penetration. The new solid-state battery can be reused up to 10,000 timesĪccording to media reports, Li Xin, a Chinese professor at Harvard University, and Ye Luhan, a student, have developed a new solid-state battery that can be reused for 10,000 times and can be charged in three minutes at the fastest time.By comparison, the best solid-state batteries currently run for 2,000 to 10000 cycles.Ī related paper published by the duo in May 2021 describes the principle of the new solid-state battery. Electric aircraft and NASA’s advanced air mobility program will be the main beneficiaries of the new battery technology, according to the presentation. Over the past year, the team has managed to increase the battery’s discharge rate by a factor of 10, and since then by a factor of five, bringing researchers closer to the goal of powering large vehicles.” NASA said in its press release. “SABERS has experimented with new materials for batteries that have shown remarkable progress in discharging electricity. In addition, unlike lithium-ion batteries that come in a single package, NASA’s solid-state batteries stack cells on top of each other in a single case, reducing battery weight by 30% to 40%. NASA’s solid-state battery is called a selenium sulfur battery, which uses cheap and readily available sulfur as an electrolyte, and a “porous graphene” material previously developed by NASA, which is conductive and lightweight.Because solid-state lithium batteries have no liquid electrolyte, they reduce the risk of liquid fire and explosion. In April 2021, NASA announced its program to improve solid-state battery Charging Efficiency and safety(e Solid-state Architecture Batteries for Enhanced Rechargeability and Safety, “SABERS”)The division will develop solid-state batteries for electric aircraft, which have a higher energy density than existing lithium-ion batteries with liquid electrolytes, are smaller, can be used after impact, and have a lower risk of fire. According to NASA’s website, the energy density of the solid state battery developed by NASA has reached 500 Wh/kg, which is almost twice the energy density of the current best electric vehicle battery - Tesla’s 4680 lithium battery has an energy density of 300 Wh/kg. ![]() NASA says it has made a breakthrough in developing solid-state batteries for aviation. NASA has made a major breakthrough in solid-state batteries Battery swapping station business model. ![]()
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