Solid-State Aluminum-Ion Battery with Membrane-Free Luffa Cathode
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Solution Overview
Problem
Existing aluminum-ion batteries face challenges in achieving cost-effective, safe, and high-energy density storage solutions, particularly in the construction and materials used for electrodes and electrolytes, which limit their widespread adoption in energy storage applications.
Innovation Solution
The development of a membrane-free, all-solid-state rechargeable aluminum-ion battery using a coiled anodic aluminum wire, carbonized luffa sponge cathode, and a solid electrolyte composed of urea, sea-salt, and sodium silicate, maximizing electrochemical reaction surfaces and utilizing affordable and widely available materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional aluminum-ion batteries use traditional electrolytes and electrode structures, then basic battery function is achieved, but energy density and safety are limited
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by using a eutectic mixture of urea and sea salt that solidifies at low temperatures. This parameter change (phase transition) simultaneously improves safety by eliminating liquid electrolyte hazards while maintaining ionic conductivity for high energy density operation
Solution Approach 2:
The patent creates a composite solid electrolyte system combining urea, sea salt, and sodium silicate hydrate gel. This composite material integrates the low-temperature eutectic properties of urea-sea salt with the gel structure of sodium silicate, achieving both high ionic conductivity for energy density and solid-state safety
2Ease of manufacture
If traditional battery materials are used, then manufacturing is straightforward, but cost and performance are compromised
Solution Approach 1:
The patent replaces expensive conventional electrolytes and cathode materials with cheap, abundant materials: urea and sea salt for the electrolyte, and carbonized luffa sponge (agricultural waste) for the cathode. This substitution dramatically reduces cost while the porous structure of luffa sponge provides high surface area for maintaining energy storage capacity
Solution Approach 2:
The patent utilizes the naturally porous structure of carbonized luffa sponge as the cathode material. The porous structure provides high surface area for electrochemical reactions, enabling high energy storage capacity despite using low-cost agricultural waste material instead of expensive conventional cathodes
3Reliability
If membrane-based designs are used, then electrode separation is achieved, but device complexity and cost increase
Solution Approach 1:
The patent removes the membrane component entirely from the battery structure. Instead of using a physical separator membrane, it relies on the solid-state nature of the electrolyte itself to prevent direct contact between electrodes, thereby eliminating device complexity and cost associated with membranes while maintaining reliable electrode separation
Solution Approach 2:
The solid electrolyte performs multiple functions simultaneously: it serves as the ionic conductor, the physical separator between electrodes, and the safety element. This multi-functionality eliminates the need for separate membrane components, reducing device complexity while maintaining reliable electrode separation
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 energy storage capacity and safety while reducing costs, offering a high-energy density solution suitable for various energy storage applications, including portable electronics and grid-scale energy systems.
Implementation Method 1
a solid electrolyte consisting of a compound mixture of urea, sea-salt, and sodium silicate
Implementation Method 2
a coiled anodic aluminum wire... maximizing electrochemical reaction surfaces
Implementation Method 3
carbonized luffa sponge cathode... maximizing electrochemical reaction surfaces
Data Source
AI summary
A method and apparatus for storing electricity using a rechargeable, membrane-free, electrochemical cell with axially placed coiled aluminum wire anode, carbonized luffa sponge cathode, and a solid electrolyte. The invention teaches the use of common ultra-low-cost material components, and a simple cell construction method.