Storedot Ltd.

Ohad Goldbart

Daniel Aronov

Eran Sella

Hani Farran

Nitzan Shadmi

Doron Burshtain

David Jacob

Sergey Remizov

Carmit Ophir

Leora Shapiro

Boris Brudnik

Simon Litsyn

Leonid Krasovitsky

Ron Paz

Avraham Edelshtein

Yaniv Damtov

Nitzam Shadmi

Nicky Zintchenko Nachshony

Anodes for lithium-ion batteries and methods for their production are provided. Anodes comprise an initial anode made of consolidated anode material particles, and a coating of the initial anode, that comprises a layer of an ionic-conductive polymer which provides an artificial SEI (solid-electrolyte interphase) to facilitate lithium ion transfer through the coating while preventing direct fluid communication with the anode material particles and electrolyte contact thereto. The coating may be configured to keep the anode resistance low while preventing electrolyte decomposition thereupon, enhancing cell stability and cycling lifetime.

Anode coating in lithium ion batteries

Methods, anode material particles, mixtures, anodes and lithium-ion batteries are provided, having passivated silicon-based particles that enable processing in oxidizing environments such as water-based slurries. Methods comprise forming a mixture of silicon particles with nanoparticles (NPs) and a carbon-based binders and/or surfactants, wherein the NPs comprise at least one of: metalloid oxide NPs, metalloid salt NPs and carbon NPs, reducing the mixture to yield a reduced mixture comprising coated silicon particles with a coating providing a passivation layer (possibly amorphous), and consolidating the reduced mixture to form an anode. It is suggested that the NPs provide nucleation sites for the passivation layer on the surface of the silicon particles&#x2014;enabling significant anode-formation process simplifications such as using water-based slurries&#x2014;enabled by disclosed methods and anode active material particles.

Passivated silicon-based anode material particles

Electrodes, production methods and mono-cell batteries are provided, which comprise active material particles embedded in electrically conductive metallic porous structure, dry-etched anode structures and battery structures with thick anodes and cathodes that have spatially uniform resistance. The metallic porous structure provides electric conductivity, a large volume that supports good ionic conductivity, that in turn reduces directional elongation of the particles during operation, and may enable reduction or removal of binders, conductive additives and/or current collectors to yield electrodes with higher structural stability, lower resistance, possibly higher energy density and longer cycling lifetime. Dry etching treatments may be used to reduce oxidized surfaces of the active material particles, thereby simplifying production methods and enhancing porosity and ionic conductivity of the electrodes. Electrodes may be made thick and used to form mono-cell batteries which are simple to produce and yield high performance.

Aerogel-based electrodes

Systems and methods are provided for operating lithium ion devices by setting an operative capacity below a rated capacity value of the lithium ion device, and operating the lithium ion device at the set operative capacity by decreasing a lower voltage cutoff value during discharging and/or by increasing an upper voltage cutoff level during charging&#x2014;to support operation at the set operative capacity. The systems and methods may utilize residual lithium in device components such as anodes, cathodes, electrolyte etc. or combinations thereof, and/or external lithiation to increase the cycling lifetime of the lithium ion devices, to adapt to user preferences and expected use profiles, and to simplify device status indications to the user. Advantageously, relatively simple circuitry is required to implement the provided methods and systems, and achieve customizable operation of the lithium ion devices.

Lithium ion devices, operated with set operative capacity

Lithium ion batteries and cells, as well as operating and testing methods are provided, which utilize a transparent pouch to monitor the battery in operational condition and/or in operation. Transparent parts of the pouch may be used for direct sensing of cell elements. Removable covers may be used to protect battery components from illumination damage. Indicators in the transparent pouch may be associated with cell components such as electrodes and electrolyte to indicate their condition. External sensors may be used to derive data from the indicators, and bi-directional electromagnetic (e.g., optical) communication may be established through the transparent pouch, to enhance monitoring and spare physical electrical connections. For example, the transparent pouch may be used to monitor and enhance battery safety and/or to modify operational parameters non-destructively, during operation of the battery.

Optical communication through transparent pouches of lithium ion batteries

Electrodes made of electrically conductive metallic porous structure with embedded active material particles

Improved anodes and cells are provided, which enable fast charging rates with enhanced safety due to much reduced probability of metallization of lithium on the anode, preventing dendrite growth and related risks of fire or explosion. Anodes and/or electrolytes have buffering zones for partly reducing and gradually introducing lithium ions into the anode for lithiation, to prevent lithium ion accumulation at the anode electrolyte interface and consequent metallization and dendrite growth. Various anode active materials and combinations, modifications through nanoparticles and a range of coatings which implement the improved anodes are provided.

Methods of preparing anodes using tin as active material

Tin silicon anode active material

Growing community of inventors

Yehud, Israel

Ohad Goldbart