Storedot Ltd.

Leora Shapiro

Doron Burshtain

Hani Farran

Daniel Aronov

Eran Sella

Nir Kedem

David Jacob

Sergey Remizov

Nitzan Shadmi

Ohad Goldbart

Carmit Ophir

Boris Brudnik

Niles A Fleischer

Rony Schwarz

Moria Koren

Maxim Kagan

Electrolytes, anodes, lithium ion cells and methods are provided for preventing lithium metallization in lithium ion batteries to enhance their safety. Electrolytes comprise up to 20% ionic liquid additives which form a mobile solid electrolyte interface during charging of the cell and prevent lithium metallization and electrolyte decomposition on the anode while maintaining the lithium ion mobility at a level which enables fast charging of the batteries. Anodes are typically metalloid-based, for example include silicon, germanium, tin and/or aluminum. A surface layer on the anode bonds, at least some of the ionic liquid additive to form an immobilized layer that provides further protection at the interface between the anode and the electrolyte, prevents metallization of lithium on the former and decomposition of the latter.

Partly immobilized ionic liquid electrolyte additives for lithium ion batteries

Methods of preparing Si-based anode slurries and anode made thereof are provided. Methods comprise coating silicon particles within a size range of 300-700 nm by silver and/or tin particles within a size range of 20-500 nm, mixing the coated silicon particles with conductive additives and binders in a solvent to form anode slurry, and preparing an anode from the anode slurry. Alternatively or complementarily, silicon particles may be milled in an organic solvent, and, in the same organic solvent, coating agent(s), conductive additive(s) and binder(s) may be added to the milled silicon particles&#x2014;to form the Si-based anode slurry. Alternatively or complementarily, milled silicon particles may be mixed, in a first organic solvent, with coating agent(s), conductive additive(s) and binder(s)&#x2014;to form the Si-based anode slurry. Disclosed methods simplify the anode production process and provide equivalent or superior anodes.

Same-solvent preparation of organic anode slurries

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.

Polymer coatings and anode material pre-lithiation

Methods of preparing anodes using tin as active material

Tin silicon anode active material

Coated pre-lithiated anode material particles and cross-linked polymer coatings

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Ramat Gan, Israel

Leora Shapiro