Artificial solid electrolyte interphase layer method and assembly

EP4758658A1Pending Publication Date: 2026-06-17LIONVOLT BV
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
LIONVOLT BV
Filing Date
2024-08-08
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

Lithium-ion batteries face challenges such as cycle life degradation due to porosity and dendrite formation, as well as issues like cell short circuits and adverse reactions leading to poor life cycle stability and loss of alkali-metal inventory.

Method used

The development of an artificial solid electrolyte interphase (aSEI) layer generated ex-situ through an electrochemical process, which pre-covers the electrode with an organic polymer-based layer, reducing the impact on initial Li-inventory and decoupling the SEI formation from the battery cell's electrolyte composition.

Benefits of technology

This approach enhances the mechanical strength, ionic conductivity, and dielectric properties of the aSEI layer, improving the uniformity of Li-ion flux and reducing dendrite formation, thereby increasing the cycle life and stability of lithium-ion batteries.

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Abstract

The present disclosure relates to a method of manufacturing a protected electrode (10), specifically a method of ex-situ generation of a solid electrolyte interphase layer (SEI). The disclosure further provides electrodes having an ex-situ generated SEI layer, a battery comprising said electrode, and a manufacturing assembly. The method comprises covering an electrically conductive current collector substrate (1) with a coating (5); exposing (131) the current collector substrate (1) to a deposition electrolyte (30) comprising alkali metal cations; and while exposed to the electrolyte, electrochemically forming an artificial SEI by electrochemically reacting (132) the alkali metal cations with one or more organic constituents comprised in the coating (30) having the current collector substrate (1) as a working electrode (WE) and a further electrode (40) that is separated therefrom by a gap (50) as a counter electrode (CE).
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