What is solid electrolyte interface?

The solid electrolyte interface (SEI) is a passivation layer formed on the surface of lithium-ion battery (LIB) anode materials produced by electrolyte decomposition. The quality of the SEI plays a critical role in the cyclability, rate capacity, irreversible capacity loss and safety of lithium-ion batteries (LIBs).

What is SEI battery?

The SEI layer or solid electrolyte interphase layer is a component of lithium-ion batteries, formed from the decomposition materials associated with the electrolyte of the battery. Forge Nano has developed ALD coating techniques that reduce the SEI layer in lithium-ion batteries leading to a greater cycle life.

What is SEI layer in lithium-ion battery?

A passivation layer called the solid electrolyte interphase (SEI) is formed on electrode surfaces from decomposition products of electrolytes. The SEI allows Li+ transport and blocks electrons in order to prevent further electrolyte decomposition and ensure continued electrochemical reactions.

What are examples of solid electrolytes?

Popular examples are lithium phosphorus oxynitride (LIPON) and the lithium thiophosphates (Li2S–P2S5). Solid polymer electrolyte (SPE) are defined as a solvent-free salt solution in a polymer host material that conducts ions through the polymer chains.

What are the components of a solid electrolyte interface?

This decomposition results in the formation of LiF, Li 2 O, LiCl, Li 2 CO 3 compounds. These components precipitate on the electrode and form a few nanometre thick layers called solid electrolyte interface (SEI).

How does solid electrolyte interface affect lithium battery?

One important parameter that decreases the performance and lifetime of lithium battery is the development of a solid electrolyte interface (SEI), this is a solid layer that builds inside the lithium battery as we start using it.

What causes the formation of the SEI in an electrolyte?

This is due to the formation of SEI (solid electrolyte interface). For the first few charge and discharge cycles, when electrolyte comes in contact with the electrode, solvents in an electrolyte which are accompanied by the lithium ions during charging reacts with the electrode and starts to decompose.

What makes a SEI film resist electrolyte movement?

The resulting SEI film is porous, compact, heterogeneous, insulating to electrons tunneling and conductive for lithium ions. Once the SEI layer forms, it resists the electrolyte movement through the passivating layer to the electrode.