This podcast reviews patents and academic journals in the area of lithium and post lithium ion battery. It focuses on cell materials and assembly, however, it may also venture in battery pack technolgy.
Plating lithium metal anodes through inorganic solid electrolytes is challenging and slow due to proliferation of dendrites along the grain boundary where ionic conductivity is higher. Sakamoto’s group shares evidence of rate improvements without dendritic growth with LLZO solid electrolytes.
The brain child of liquid crystal polymer guru Mike Zimmerman, Ionic Materials has attracted a lot of recent investment from car OEMs and battery companies alike. Renault, Nissan, Mitsubishi, Volta and A123 are a few of the publicized investors. The main draw is their solid polymer electrolyte which self extinguishes if set on fire and has HIGHER conductivity than commercial liquid electrolytes even at temperatures as low as -20C. In this podcast i dissect (the only) two patents from this company and discuss their “secret” solid electrolyte composition.
Sion Power has been a leader in batteries with lithium metal for more than 20 years. Traditionally championing lithium-sulfur batteries, it has recently expanded into high energy density batteries with lithium metal and traditional high voltage cathodes such as NMC622/811, etc. It’s Licerion product offers a 20Ah pouch cell, 500 Wh/kg, 1000 Wh/l with an impressive EOL of 80% after 500 cycles at C/3. In this podcast i discuss its 2018 patent on the importance of (anisotropic) pressure applied to cells with lithium metal anodes. Enjoy!
A lithium metal electrode and its related lithium metal battery is disclosed in the present invention. The lithium metal electrode comprises a current collector, a lithium metal layer, an insulation frame, a porous electrical insulation layer and an ionic diffusion layer. The current collector has at least a well. The lithium metal layer is disposed on the bottom surface of the well. The insulation frame is disposed alone the opening of the well. The insulation frame extends radially outward the opening to cover a top surface of the current collector partially and extends vertically toward the inner sidewall of the well. The lithium dendrites will mostly plate in the well and will not plate upwards due to the inhibition layer. Hence, the lithium dendrites will not penetrate through the electrical insulator so that the safety of the lithium metal battery can be improved greatly.
The lithium-sulfur battery, despite possessing high theoretical specific energy, faces practical challenges of polysulfide shuttling and low cell-level energy density and hence requires significant functional advances over porous carbon for the cathode host. Here we report the lightweight superconductor MgB 2—whose average mass/atom is comparable with carbon—as a metallic sulfur host that fulfills both electron conduction and polysulfide immobilization properties. We show by means of first-principles calculations that borides are unique in that both B- and Mg-terminated surfaces bond exclusively with the S x2− anions (not Li +), and hence enhance electron transfer to the active S x2− ions. The surface-mediated polysulfide redox behavior results in a much higher exchange current in comparison with MgO and carbon. By sandwiching MgB 2 nanoparticles between graphene nanosheets to form a high-surface-area composite structure, we demonstrate sulfur cathodes that achieve stable cycling at a high sulfur loading of 9.3 mg cm −2.
The present invention relates to a battery comprising a liquid hydrophobic phase transition substance which may improve its safety and restrain the deterioration in performance without deteriorating its properties.