Anodeless Lithium Battery Composite Layer for Uniform Electrodeposition
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Solution Overview
Problem
Anodeless lithium secondary batteries face issues with non-uniform lithium electrodeposition due to lithium's high reactivity, leading to rapid capacity loss and unstable lifespan, limiting their performance and durability.
Innovation Solution
A lithium secondary battery design featuring an anode current collector with a composite layer containing carbon, metal particles capable of alloying with lithium, and a solid electrolyte interfacial layer, which facilitates uniform lithium electrodeposition and desorption, enhancing lithium utilization and battery stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as an anode material, then capacity and energy density are improved, but lithium utilization is poor and lifespan stability deteriorates due to non-uniform electrodeposition
Solution Approach 1:
The patent introduces an intermediate layer between the anode current collector and cathode active material layer. This intermediate layer serves as a mediator that promotes uniform lithium electrodeposition and desorption, preventing the non-uniform deposition that occurs with pure lithium metal anodes. The intermediate layer includes a composite structure with carbon component, metal particles capable of alloying with lithium, and polymer binder, creating a controlled environment for lithium ion transfer.
Solution Approach 2:
The patent employs a composite intermediate layer combining multiple materials: carbon component (for conductivity and structure), metal particles capable of alloying with lithium (for enhanced lithium utilization and uniform deposition), and polymer binder (for structural integrity). This composite structure addresses the limitations of pure lithium metal by integrating materials with complementary properties that collectively improve both capacity and lifespan stability.
2Quantity of substance
If anodeless battery design is adopted, then price competitiveness and capacity per volume/weight are improved, but lithium utilization is poor due to limited use of lithium
Solution Approach 1:
The intermediate layer acts as an intermediary that enhances lithium utilization in anodeless battery design. By providing a structured interface with carbon component and metal particles, it facilitates more effective lithium ion transfer and deposition, overcoming the limited lithium utilization inherent in conventional anodeless designs while maintaining the space and weight advantages.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the anode interface by introducing the intermediate layer with specific composition (carbon, metal particles, polymer binder). This changes the electrodeposition behavior and lithium ion transfer characteristics, improving lithium utilization without requiring traditional lithium metal anode structures, thus maintaining the compact anodeless design.
3Quantity of substance
If lithium metal is used, then large capacity is achieved, but non-uniform electrodeposition occurs due to high reactivity of lithium
Solution Approach 1:
The intermediate layer serves as a mediator that controls and uniformizes the electrodeposition process. The carbon component provides a conductive network, metal particles offer alloying sites for uniform lithium distribution, and polymer binder maintains structural integrity. This intermediary structure prevents the non-uniform deposition that occurs with direct lithium metal usage.
Solution Approach 2:
The intermediate layer introduces local quality variations at the anode interface through its composite structure. Different regions of the intermediate layer (carbon domains, metal particle clusters, polymer matrix) provide localized environments that collectively ensure uniform lithium deposition across the entire electrode surface, addressing the high reactivity issue of lithium metal.
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 solution enables stable electrodeposition and desorption of lithium, improving the battery's coulombic efficiency and lifespan, and allowing for higher energy density even with a wide voltage range, thus addressing the limitations of anodeless batteries.
Implementation Method 1
metal particles capable of alloying with lithium
Implementation Method 2
solid electrolyte interfacial layer having high ionic conductivity
Implementation Method 3
Li metal is electroplated on the anode current collector
Data Source
AI summary
Disclosed are an anodeless lithium secondary battery having improved lithium utilization and a method of manufacturing the same. The lithium secondary battery includes an anode current collector, a composite layer disposed on the anode current collector, an intermediate layer disposed on the composite layer, a cathode active material layer disposed on the intermediate layer, and a cathode current collector disposed on the cathode active material layer. The composite layer includes a carbon component, metal particles capable of alloying with lithium, a polymer binder capable of binding to the metal particles through electrostatic attraction, and a solid electrolyte interfacial layer coated on the metal particles.