Tungsten Oxide Anode and pH-Tuned Electrolyte for Aqueous K-Ion Batteries
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Solution Overview
Problem
There is a need for a novel negative electrode active material and configuration for potassium ion secondary batteries, as existing technologies lack effective materials for both positive and negative electrodes, and optimal combinations of electrolyte solutions and active materials for charging and discharging processes.
Innovation Solution
The use of tungsten oxide as a negative electrode active material in combination with an aqueous potassium ion battery, featuring an electrolyte solution with a pH range of 4.0 to 12.0 and potassium pyrophosphate dissolved in water, which allows for effective charging and discharging capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional aqueous electrolyte solutions are used in potassium ion batteries, then the battery structure is simple, but the charge-discharge performance is insufficient and hysteresis is high
Solution Approach 1:
The patent changes the chemical parameters of the aqueous electrolyte by introducing potassium pyrophosphate as a specific additive, which modifies the electrolyte composition to achieve lower hysteresis and improved charge-discharge performance while maintaining the simple aqueous system
2Productivity
If novel negative electrode materials are developed for potassium ion batteries, then the charge-discharge efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent uses tungsten oxide with controlled particle size parameters (1-10 μm) to achieve high charge-discharge efficiency. By optimizing the physical parameters of the existing material rather than creating complex new structures, the patent improves performance while limiting complexity increase
3Speed
If the electrolyte pH is optimized for better performance, then the charge-discharge rate increases, but electrolysis of water is promoted
Solution Approach 1:
The patent introduces potassium pyrophosphate as an intermediary substance in the aqueous electrolyte. This mediator allows the system to operate at optimized pH levels for high charge-discharge rates while suppressing water electrolysis, effectively mediating between performance requirements and electrolyte stability
Solution Approach 2:
The patent optimizes the pH parameter of the aqueous electrolyte to a specific range that simultaneously achieves high charge-discharge rates and suppresses water electrolysis, demonstrating parameter optimization to resolve the contradiction between speed and harmful effects
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 enables a novel potassium ion secondary battery with improved charge-discharge performance, reduced hysteresis, and decreased overvoltage, facilitating efficient operation and suppressing electrolysis of the aqueous electrolyte.
Implementation Method 1
A negative electrode active material for a water-based potassium ion battery comprising tungsten oxide and/or consisting of tungsten oxide
Implementation Method 2
the aqueous electrolytic solution comprising a solvent comprising water and potassium pyrophosphate dissolved in the solvent
Implementation Method 3
facilitating efficient operation and suppressing electrolysis of the aqueous electrolyte
Data Source
AI summary
The present disclosure provides a novel negative electrode active material for a potassium ion secondary battery and a novel configuration of a potassium ion secondary battery. The negative electrode active material for an aqueous potassium ion battery of the present disclosure comprising tungsten oxide and/or consisting of tungsten oxide. The aqueous potassium ion battery of the present disclosure comprises tungsten oxide as a negative electrode active material. The aqueous potassium ion battery of the present disclosure may comprise an aqueous electrolytic solution, a pH of the aqueous electrolytic solution is 4.0 to 12.0, and the aqueous electrolytic solution may comprise a solvent comprising water and potassium pyrophosphate dissolved in the solvent.