Electrode and battery
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Solution Overview
Problem
Conventional electrodes fail to simultaneously achieve high charge-discharge efficiency and discharge capacity, with lithium titanate-based batteries offering high efficiency but low capacity, and existing structures not adequately addressing both requirements.
Innovation Solution
The electrode structure comprises a current collector, a first electrode layer with a Mo and O-based active material, and a second electrode layer with a Li, Ti, and O-based active material, with at least one layer incorporating a solid electrolyte, optimizing charge-discharge efficiency and capacity through specific material combinations and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lithium titanate is used as the negative electrode active material, then charge-discharge efficiency is improved, but discharge capacity deteriorates
Solution Approach 1:
The patent applies composite materials by combining lithium titanate (providing high charge-discharge efficiency) with a halide solid electrolyte (providing high ion conductivity). This composite structure allows the electrode to simultaneously achieve high charge-discharge efficiency from the lithium titanate and high discharge capacity from the solid electrolyte's ability to facilitate rapid ion transport, thereby resolving the contradiction between efficiency and capacity.
2Ease of manufacture
If conventional electrode structures are used, then manufacturing simplicity is maintained, but both charge-discharge efficiency and discharge capacity cannot be satisfied simultaneously
Solution Approach 1:
The patent applies segmentation by dividing the electrode into distinct functional layers: a lithium titanate-based active material layer and a halide solid electrolyte layer. This segmented structure allows each layer to perform its specialized function (lithium titanate for efficient charge-discharge, solid electrolyte for high ion conductivity), achieving superior performance while maintaining relatively simple manufacturing processes through layer-by-layer construction.
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
This configuration enhances both charge-discharge efficiency and discharge capacity, reduces average discharge voltage variation, and improves battery safety and heat resistance, while maintaining cycle characteristics.
Implementation Method 1
at least one selected from the group consisting of the first electrode layer and the second electrode layer includes a solid electrolyte
Implementation Method 2
a first electrode layer including a first active material containing Mo and O
Implementation Method 3
a second electrode layer including a second active material containing Li, Ti, and O
Data Source
AI summary
An electrode includes a current collector, a first electrode layer including a first active material containing Mo and O, and a second electrode layer including a second active material containing Li, Ti, and O. At least one selected from the group consisting of the first electrode layer and the second electrode layer includes a solid electrolyte.