Anodeless All-Solid-State Battery Porous Layer Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional all-solid-state batteries using inorganic solid electrolytes have inferior energy density and power output compared to lithium-ion batteries with liquid electrolytes, and anodeless-type batteries face risks of short circuits and performance deterioration due to uneven lithium precipitation and irreversible reactions.
Innovation Solution
An anodeless-type all-solid-state battery design featuring a porous layer with interconnected fibrous material coated with a sulfide solid electrolyte, where lithium is stably precipitated, enhancing energy density and preventing lithium dendrite formation by varying the electrolyte and fibrous material conductivity across different regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphite is used as the anode material to ensure ionic conductivity, then ionic conductivity is improved, but energy density per unit weight deteriorates due to adding excess solid electrolyte with large specific gravity
Solution Approach 1:
The patent removes the traditional graphite anode material and replaces it with a porous layer structure that directly receives lithium ions. This extraction of the graphite component eliminates the need for excess solid electrolyte addition, thereby resolving the contradiction between maintaining ionic conductivity and preserving energy density per unit weight.
Solution Approach 2:
The patent introduces a porous layer with controlled porosity (30-70%) as the anode structure. This porous material provides sufficient surface area for lithium ion insertion while maintaining low density, thus improving energy density per unit weight while ensuring adequate ionic conductivity through the porous network.
2Quantity of substance
If lithium metal is used for the anode to improve energy density, then energy density is improved, but price competitiveness and large-scale implementation deteriorate due to technical limitations
Solution Approach 1:
The patent changes the physical and chemical parameters of the anode by using a porous carbon-based structure with controlled porosity and surface area instead of lithium metal. This parameter change maintains high energy density while dramatically improving manufacturability, price competitiveness, and scalability.
3Quantity of substance
If an anodeless-type structure is used to achieve high energy density, then energy density is improved, but reliability deteriorates due to uneven lithium precipitation and increase in irreversible reactions causing short circuits and performance deterioration
Solution Approach 1:
The patent applies local quality by creating a porous layer with specific spatial characteristics - controlled porosity distribution, surface area, and pore size - that locally optimize lithium ion deposition. This localized structural control ensures uniform lithium precipitation throughout the anode, preventing short circuits and reducing irreversible reactions while maintaining high energy density.
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 battery achieves high energy density and stable operation by stabilizing lithium precipitation and suppressing dendrite formation, leading to improved charging and discharging efficiency and extended cycle life.
Implementation Method 1
at least a portion of the surface of the fibrous material is coated with a solid electrolyte
Implementation Method 2
lithium is stably precipitated
Data Source
AI summary
Disclosed is an anodeless-type all-solid-state battery having a novel structure, which has high energy density and is capable of operating stably.