Aluminum Anodes in Solid-State Batteries for Higher Energy Density
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Solution Overview
Problem
Conventional lithium-ion batteries face limitations in energy density and safety due to the use of graphite anodes and liquid electrolytes, which require wet processing and can lead to undesirable side reactions.
Innovation Solution
The use of aluminum-based anodes with solid-state electrolytes in solid-state batteries, which allow for higher lithium capacity per unit volume, eliminate wet processing, and enhance safety by avoiding dendrite formation and SEI layer buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If graphite anodes are used in conventional lithium-ion batteries, then the battery structure is simple and manufacturing is easy, but the energy density is limited due to low lithium capacity per unit volume
Solution Approach 1:
The patent changes the anode material from graphite to aluminum-based alloy, fundamentally altering the chemical composition and structure. This parameter change enables significantly higher lithium capacity per unit volume (up to 3.3 Li atoms per Al atom) while maintaining a solid-state structure that is compatible with existing battery architectures.
Solution Approach 2:
The patent employs aluminum-based composite materials that combine aluminum with other elements to create anode structures with optimized lithium storage capacity. These composite materials achieve high energy density while maintaining structural integrity and manufacturability.
2Reliability
If liquid electrolytes are used in conventional lithium-ion batteries, then ion transport is efficient, but safety issues arise due to dendrite formation and SEI layer buildup
Solution Approach 1:
The patent changes the electrolyte from liquid to solid-state, fundamentally altering the physical state and chemical properties of the electrolyte medium. This parameter change eliminates dendrite formation and SEI layer buildup, significantly improving battery safety and reducing energy loss while maintaining efficient lithium ion transport through the solid electrolyte structure.
3Object-generated harmful factors
If conventional lithium-ion battery manufacturing is used, then wet processing is simple, but undesirable side reactions occur between liquid electrolyte and electrode materials
Solution Approach 1:
The patent changes the electrolyte from liquid to solid-state, which fundamentally alters the manufacturing process. This parameter change eliminates side reactions between the electrolyte and electrode materials while enabling new manufacturing approaches such as dry processing and sintering techniques, improving both safety and manufacturability.
4Quantity of substance
If aluminum-based anodes with solid-state electrolytes are used, then energy density and safety are improved, but manufacturing processes become more complex
Solution Approach 1:
The patent employs sintering temperature and pressure as key parameters to consolidate powdered aluminum and solid electrolyte into dense, functional components. By optimizing these parameters, the manufacturing process achieves high lithium capacity while maintaining ease of production through powder metallurgy techniques.
Solution Approach 2:
The patent uses composite materials that combine aluminum with other elements to create anode structures with optimized lithium storage capacity. These composite materials achieve high energy density while maintaining structural integrity and manufacturability through established metallurgical processes.
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 aluminum-based anodes with solid-state electrolytes increase energy density and safety, reducing the need for liquid solvents and minimizing SEI layer formation, resulting in improved battery performance and manufacturability.
Implementation Method 1
aluminum-based alkali metal alloying anodes may incorporate lithium atoms into the crystalline matrix of the aluminum
Implementation Method 2
the electrolyte allows lithium ions to transport between the cathode and the anode
Data Source
AI summary
Described herein are solid-state electrochemical cells incorporating a solid-state electrolyte and aluminum as an anode active material. The use of aluminum as an anode active material can drive an increase in energy density and specific energy as compared to cells using conventional lithium-ion anode materials (e.g., graphite). Pairing an aluminum anode with a solid-state electrolyte can further provide for improved safety in secondary cells as compared to cells using lithium metal anodes for less complex manufacturing compared to cells using liquid electrolytes or wet processed anode materials.