Bipolar Secondary Battery with Intermediate Electrode
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Solution Overview
Problem
Current secondary batteries do not achieve sufficient battery characteristics, necessitating improvements in configuration to enhance energy density and performance for applications in electronic devices, electric vehicles, and power storage systems.
Innovation Solution
A secondary battery configuration with a cathode, an anode, and an intermediate electrode, where each includes titanium-containing compounds, and an electrolytic solution with a sufficient concentration of electrolyte salt relative to solvent molecules, optimizing voltage resistance and battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional secondary battery configurations are used, then basic battery function is maintained, but battery characteristics are insufficient for high energy density applications
Solution Approach 1:
The battery is divided into multiple electrodes including at least one intermediate electrode positioned between the positive and negative electrodes. This segmentation allows for optimized ion transport pathways and improved electrochemical performance, enabling higher energy density while maintaining reliable battery characteristics through structured electrode arrangement
Solution Approach 2:
The patent employs composite electrode structures with specific material compositions, including titanium-containing compounds in the intermediate electrode and carefully selected cathode and anode materials. These composite material configurations enhance both energy density and operational reliability by leveraging synergistic material properties
2Weight of moving object
If battery size and weight are reduced for electronic devices, then portability is improved, but achieving high energy density becomes more difficult
Solution Approach 1:
The patent utilizes thin-film electrode structures and flexible current collectors that reduce overall battery weight and volume. The intermediate electrode design employs thin active material layers that maintain high surface area to volume ratio, enabling high energy density in a compact, lightweight form factor suitable for portable electronic devices
Solution Approach 2:
The patent optimizes critical parameters including electrolyte composition, electrode thickness, and material density to achieve maximum energy density within reduced size constraints. By carefully adjusting these parameters, the battery delivers high energy content in a lightweight package without compromising performance
3Reliability
If intermediate electrode with titanium-containing compound is added, then battery characteristics are improved, but device complexity increases
Solution Approach 1:
The intermediate electrode serves multiple functions simultaneously: it acts as a physical separator between positive and negative electrodes, provides additional active material for energy storage, facilitates ion transport, and enhances structural stability. This multi-functionality improves battery characteristics without proportionally increasing complexity, as one component performs several critical roles
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 configuration achieves superior battery characteristics, including improved voltage resistance and enhanced energy density, enabling effective use in electronic devices, electric vehicles, and power storage systems.
Implementation Method 1
The electrolytic solution includes a solvent and an electrolyte salt and has number of molecules of the electrolyte salt equal to or larger than number of molecules of the solvent
Data Source
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AI summary
A secondary battery includes: a cathode including a cathode current collector and a first cathode active material layer provided on the cathode current collector; an anode including an anode current collector and a first anode active material layer provided on the anode current collector to face the first cathode active material layer and including a titanium-containing compound; an intermediate electrode provided between the cathode and the anode and including an intermediate current collector, a second anode active material layer provided on the intermediate current collector to face the first cathode active material layer and including the titanium-containing compound, and a second cathode active material layer provided on the intermediate current collector to face the first anode active material layer; and an electrolytic solution including a solvent and an electrolyte salt and having number of molecules of the electrolyte salt equal to or larger than number of molecules of the solvent.