Solid-State Lithium Battery Anode With Graphene-Silver Pore Control
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Solution Overview
Problem
All-solid lithium secondary batteries face challenges in improving lithium metal storage, charge/discharge efficiency, and safety due to the generation of pores between the solid electrolyte and metal layers, leading to reduced energy density and lifespan.
Innovation Solution
Incorporating a negative electrode active material layer with a carbon structure and silver nanoparticles, where the carbon structure consists of interconnected graphene sheets with different plane directions, enhancing lithium ion mobility and storage, and using a reduced amount of silver nanoparticles to improve price competitiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as negative electrode active material layer to improve energy density, then energy density is improved, but pores are generated between solid electrolyte and metal layer leading to reduced battery operation reliability
Solution Approach 1:
The patent applies composite materials by combining carbon structures (graphene sheets) with silver nanoparticles to form a composite negative electrode active material layer. This composite structure prevents pore generation between the solid electrolyte and metal layer while maintaining high energy density, thereby resolving the contradiction between energy density improvement and battery operation reliability
Solution Approach 2:
The carbon structure with silver nanoparticles acts as an intermediary layer between the solid electrolyte and lithium metal. This intermediary structure facilitates lithium ion insertion and extraction while preventing direct contact that would cause pore formation, thus maintaining both high energy density and reliable battery operation
2Reliability
If end plate is used to apply high external pressure to prevent pore generation, then pore generation is prevented, but battery volume is excessively increased reducing energy density
Solution Approach 1:
The patent extracts the pore prevention function from the mechanical end plate structure and transfers it to the material level by designing a pore-resistant composite negative electrode active material layer. This eliminates the need for additional end plate components, preventing volume increase while maintaining pore prevention capability
Solution Approach 2:
The patent replaces the mechanical pressure application system (end plate) with a material-based solution (carbon structure with silver nanoparticles). The composite material structure inherently prevents pore formation through its physical and chemical properties, substituting mechanical constraint with material design
3Productivity
If silver nanoparticles are used to improve lithium ion mobility and charge/discharge efficiency, then charge/discharge efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by strategically distributing silver nanoparticles on the carbon structure surface rather than uniformly throughout the entire electrode. This localized application concentrates the high-cost material where it is most needed for lithium ion mobility enhancement, improving charge/discharge efficiency while controlling manufacturing cost
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 carbon structure improves initial charge/discharge efficiency and battery life by facilitating lithium ion mobility, while reducing silver nanoparticle usage enhances price competitiveness without compromising energy density.
Implementation Method 1
the carbon structure includes a structure in which a plurality of graphene sheets are connected to each other
Implementation Method 2
facilitating lithium ion mobility
Implementation Method 3
silver nanoparticles disposed on the carbon structure by reducing silver ions
Data Source
AI summary
The present disclosure relates to an all-solid lithium secondary battery and a preparation method thereof, wherein the all-solid lithium secondary battery includes a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer, wherein the negative electrode active material layer includes a carbon structure and silver nanoparticles, the carbon structure includes a structure in which a plurality of graphene sheets are connected to each other, and the plurality of graphene sheets include two or more graphene sheets having different plane directions.