All-Solid Battery Anode Stack With Low-Porosity Electrolyte Interface
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Solution Overview
Problem
Lithium-ion batteries with liquid electrolytes pose a fire risk due to flammable organic solvents, and existing all-solid batteries face issues with interfacial resistance and cycle characteristics due to lithium deposition and limited contact area between the solid electrolyte and anode layers.
Innovation Solution
An all-solid secondary battery design featuring a lithium-containing first metal layer and a carbon-containing second anode active material layer, with a solid electrolyte layer having a surface porosity of 40% or less, and a thermally bonded lithium-first metal interlayer to enhance interfacial bonding and reduce interfacial resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer with low surface porosity (40% or less) is used, then interfacial resistance is reduced and contact area is improved, but manufacturing precision requirements increase due to the need for controlled metal penetration into pores
Solution Approach 1:
The patent utilizes a solid electrolyte layer with controlled surface porosity (40% or less) to enable metal penetration into the pore structure. This porous structure increases the effective contact area between the anode layer and solid electrolyte, reducing interfacial resistance while maintaining manufacturability through controlled formation processes
Solution Approach 2:
The patent optimizes the surface porosity parameter of the solid electrolyte layer to 40% or less, which balances the need for sufficient contact area (reducing interfacial resistance) with manufacturing feasibility. This parameter optimization resolves the contradiction between reliability improvement and manufacturing precision requirements
2Duration of action of stationary object
If a multi-layered anode structure with lithium-containing metal layer is implemented, then cycle characteristics are enhanced through improved interfacial bonding, but device complexity increases
Solution Approach 1:
The anode layer is segmented into multiple functional layers: a first anode active material layer containing lithium and a first metal that bonds to the solid electrolyte, and a second anode active material layer containing carbon-based material. This segmentation improves interfacial bonding and cycle characteristics while maintaining reasonable structural complexity
Solution Approach 2:
The patent employs composite materials in the anode layer, combining lithium-containing metal compounds with carbon-based anode active materials. This composite structure enhances interfacial bonding strength and improves cycle characteristics while managing device complexity through functional integration
3Use of energy by moving object
If lithium metal is directly contacted with solid electrolyte, then high energy density is achieved, but safety risks increase due to lithium deposition and dendrite formation
Solution Approach 1:
The patent introduces a first metal (such as silver, aluminum, or zinc) as an intermediary between lithium and the solid electrolyte. This intermediary layer prevents direct contact and subsequent lithium deposition/dendrite formation, while still enabling high energy density through the lithium-containing composite structure
Solution Approach 2:
The patent converts the potential harm of lithium deposition into a benefit by using lithium-containing metal compounds (such as lithium silver alloy, lithium aluminum alloy, or lithium zinc alloy) where lithium is stabilized in a composite structure. This eliminates dendrite formation 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 exhibits improved safety by eliminating flammable solvents, reduced interfacial resistance, and enhanced cycle characteristics with stable charge and discharge performance even at high current densities, leading to increased energy density and prolonged battery life.
Implementation Method 1
a solid electrolyte layer between the cathode layer and the anode layer, the solid electrolyte layer including a solid electrolyte
Implementation Method 2
heat-treating the first metal layer at about 100° C. to about 600° C. to form a first anode active material layer
Implementation Method 3
disposing a first composition including a first metal salt, a C1 to C10 aliphatic aldehyde, and sodium hydroxide on a first surface of the solid electrolyte layer to form a first metal layer
Implementation Method 4
drying the second composition to form a second anode active material layer including the carbon-containing anode compound
Data Source
AI summary
An all-solid secondary battery including: a cathode layer including a cathode active material layer; an anode layer; and a solid electrolyte layer between the cathode layer and the anode layer, and the solid electrolyte layer including a solid electrolyte, wherein the anode layer includes an anode current collector, a first anode active material layer in contact with the solid electrolyte layer, and a second anode active material layer between the anode current collector and the first anode active material layer, wherein the first anode active material layer is a lithium-containing first metal layer, wherein the second anode active material layer includes a carbon-containing anode active material or a carbon-containing anode active material and a second metal, and wherein a surface of the solid electrolyte layer adjacent to the first anode active material layer has a porosity of 40 percent or less.