Oxide Solid-State Battery Cell With Gel Electrolyte and Silicon Film Anode
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Solution Overview
Problem
Oxide-based solid-state batteries face challenges with poor solid-to-solid contact and limited lithium-ion conduction pathways between active materials and solid electrolytes, affecting their performance, especially in cold-start conditions and high-power applications.
Innovation Solution
The implementation of a silicon film anode and in-situ formed gel polymer electrolyte enhances lithium-ion and electronic conduction paths, improving solid-to-solid contact and achieving high cold-start voltage and capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxide-based solid-state battery uses solid electrolyte, then safety and stability are improved, but lithium-ion conduction pathways are limited and solid-to-solid contact is poor
Solution Approach 1:
The patent combines solid oxide electrolyte with gel polymer electrolyte to form a composite electrolyte system. The gel polymer component fills the pores of the solid oxide electrolyte, creating dual-phase conduction pathways that maintain the safety benefits of solid electrolytes while significantly improving lithium-ion conductivity through the flexible polymer matrix.
Solution Approach 2:
The solid oxide electrolyte is designed with a porous structure that provides extensive surface area and interconnected pathways. The pores are filled with gel polymer electrolyte, creating a three-dimensional conduction network that enhances lithium-ion transport while maintaining structural integrity and safety.
2Quantity of substance
If thin silicon film is used in anode, then capacity is improved, but solid-to-solid contact remains poor
Solution Approach 1:
The gel polymer electrolyte acts as an intermediary material between the thin silicon film anode and the solid oxide electrolyte. This intermediary layer compensates for the poor solid-to-solid contact by providing a flexible, conformal interface that maintains intimate contact with the silicon film surface, enabling efficient lithium-ion extraction and insertion.
Solution Approach 2:
The gel polymer electrolyte forms a flexible thin film that conforms to the surface topology of the silicon anode. This flexible structure adapts to the expansion and contraction of silicon during lithium insertion and extraction, maintaining continuous contact and preventing electrical disconnection.
3Productivity
If in-situ polymerization gel is added, then lithium-ion and electronic conduction paths are enhanced, but device complexity increases
Solution Approach 1:
The patent merges the solid oxide electrolyte and gel polymer electrolyte into a single integrated electrolyte system. The gel polymer is introduced as a liquid precursor that infiltrates the solid oxide structure, and upon in-situ polymerization, forms a unified composite electrolyte phase that simultaneously provides both safety and high conductivity without requiring separate components.
Solution Approach 2:
The gel polymer is introduced in its liquid monomer form before assembly, allowing it to easily infiltrate the porous solid oxide structure. The polymerization reaction then occurs in-situ within the battery structure, creating the final composite electrolyte. This preliminary liquid-state introduction simplifies the manufacturing process compared to attempting to assemble pre-formed solid gel components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution delivers high cold-start voltage, excellent 10 C rate capability, and 97.8% capacity retention over 100 cycles, making it suitable for automotive high-power applications.
Implementation Method 1
an in-situ formed gel polymer electrolyte
Implementation Method 2
enhances lithium-ion and electronic conduction paths
Implementation Method 3
cathode active material that exchanges lithium ions and a solid oxide electrolyte
Data Source
AI summary
An oxide-based solid-state battery cell includes a cathode electrode comprising a cathode current collector. A cathode active layer is arranged adjacent to the cathode current collector and comprising cathode active material that exchanges lithium ions and a solid oxide electrolyte and an in-situ polymerization gel. A separator layer comprises a solid oxide electrolyte, a porous layer, and the in-situ polymerization gel. An anode electrode comprises an anode current collector, a silicon film, and the in-situ polymerization gel.