Solid-state lithium-ion batteries

The lithium-ion battery cell with a porous silicon-containing anode and modification layer addresses the volume expansion issues of silicon anodes, enhancing lithium-ion conduction and stability, resulting in high-capacity and fast-charging solid-state batteries.

WO2025145155A1 Publication Date: 2025-07-03GRAPHENIX DEVELOPMENT INC
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Patent Information

Application Number
PCT/US2024/062265
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-12-29
Filing Date
2024-12-30
Publication Date
2025-07-03

AI Technical Summary

Technical Problem

Existing silicon-based anodes in lithium-ion batteries face challenges due to significant volume expansion and contraction, leading to rapid pulverization and electrical disconnection, which hinder the development of solid-state battery cells.

Method used

A lithium-ion battery cell design featuring a porous lithium storage layer with silicon-containing segments and a modification layer on the surface and sidewalls, enhancing lithium-ion conduction and reducing overpotential, while using a solid-state electrolyte interposed between the anode and cathode.

Benefits of technology

The design improves the stability and cycle life of silicon-based anodes, enabling safer, high-capacity, and fast-charging solid-state lithium-ion batteries with reduced decomposition and improved adhesion of the solid electrolyte interface.

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Abstract

A lithium-ion battery cell includes an anode including a porous lithium storage layer disposed over an anode current collector and a modification layer provided on the lithium storage layer. The cell further includes a cathode having a cathode active material layer in electrical contact with a cathode current collector and a lithium-ion-containing solid-state electrolyte (SSE) that is interposed between the lithium storage layer and the cathode active material. The lithium storage layer includes at least 40 atomic % silicon, tin, germanium, or a combination thereof. The lithium storage layer includes discontinuities defining a plurality of lithium storage layer segments each having an upper surface and a sidewall. The modification layer is disposed on the upper surface and at least partially along the sidewall.
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