Titanium Oxide Powder Surface Passivation for Solid-State Battery Anodes
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Solution Overview
Problem
Current all-solid-state secondary batteries face challenges in improving charge rate characteristics due to side reactions between titanium-containing oxide active materials and solid electrolytes, leading to deterioration in battery performance.
Innovation Solution
A titanium-containing oxide powder with a solvate ionic liquid comprising a Li salt and an organic solvent is used to inactivate active sites on the surface of the titanium-containing oxide, effectively suppressing reactions with the solid electrolyte, thereby enhancing the charge rate characteristics and initial discharge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If titanium-containing oxide powder with high specific surface area is used to improve contact with solid electrolyte, then initial discharge capacity is improved, but side reactions occur leading to deterioration in charge rate characteristics
Solution Approach 1:
An alumina coating layer is applied to the surface of the titanium-containing oxide particles, serving as an intermediary barrier that prevents direct contact and side reactions between the titanium-containing oxide and solid electrolyte, while still allowing lithium ion transport to maintain electrochemical performance
Solution Approach 2:
The invention creates a composite structure where alumina is coated on titanium-containing oxide particles, combining the high capacity properties of titanium-containing oxide with the protective and ion-conductive properties of alumina to achieve both high initial discharge capacity and good charge rate characteristics
2Productivity
If particle size of titanium-containing oxide is reduced to improve contact with solid electrolyte, then battery characteristics are improved, but active sites on surface cause side reactions with solid electrolyte
Solution Approach 1:
The alumina coating acts as a mediator between the titanium-containing oxide particles and the solid electrolyte, eliminating harmful side reactions while preserving beneficial contact and ion transport pathways
Solution Approach 2:
The coating is applied locally on the particle surfaces, providing protection exactly where side reactions occur (at the particle surface) without affecting the bulk properties of the titanium-containing oxide that provide high capacity
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 approach effectively suppresses side reactions, resulting in improved charge rate characteristics and initial discharge capacity for all-solid-state secondary batteries.
Implementation Method 1
combining titanium-containing oxide particles with a solvate ionic liquid composed of a Li salt and an organic solvent, the active sites on the surface of the titanium-containing oxide can be inactivated to effectively suppress the reaction with the solid electrolyte
Data Source
AI summary
Provided is a titanium-containing oxide powder whose main component is a titanium-containing oxide represented by Li4Ti5O12 or Ti1−X/2Nb2O7−X (0≤X<2), the titanium-containing oxide powder containing the titanium-containing oxide particles and a solvate ionic liquid, the solvate ionic liquid comprising a Li salt and an organic solvent.