All-Solid-State Battery Anode Edge Binder for Lithium Deposition
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Solution Overview
Problem
Current lithium-ion rechargeable batteries using graphite, silicon, or their mixtures as negative electrode active materials fail to meet the increasing demand for higher energy density and face safety issues.
Innovation Solution
A negative electrode for an all-solid-state battery is developed, comprising a current collector, a negative electrode coating layer, and a binder layer continuously or discontinuously present along the edge of the current collector, which helps in lithium ion deposition and enhances the binding force between the negative electrode coating layer and the current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If graphite, silicon, or their mixtures are used as negative electrode active materials, then the battery can be manufactured with conventional materials, but the energy density requirement cannot be met
Solution Approach 1:
The patent changes the negative electrode material from graphite/silicon to lithium metal, fundamentally altering the chemical composition and electrochemical properties to achieve higher theoretical capacity and energy density
Solution Approach 2:
The patent creates a composite structure combining lithium metal with a protective coating layer, merging the high capacity advantage of lithium metal with the stability benefits of conventional electrode materials
2Quantity of substance
If lithium metal is used as negative electrode, then high energy density can be realized, but safety issues arise
Solution Approach 1:
The patent introduces a protective coating layer as an intermediary between the lithium metal and the electrolyte, mediating their interaction to prevent direct contact and potential safety hazards while maintaining electrochemical functionality
Solution Approach 2:
The protective coating layer is applied beforehand to the lithium metal surface, providing preemptive protection against dendrite formation, moisture reaction, and other safety issues before they can occur during battery operation
3Strength
If binder layer is added along the edge of current collector, then binding force between negative electrode coating layer and current collector is enhanced, but device complexity increases
Solution Approach 1:
The patent segments the binder layer application to only the edge region of the current collector rather than the entire surface, concentrating the binding function where it is most needed while reducing overall complexity
Solution Approach 2:
The patent applies different properties to different regions: the edge region receives a binder layer for enhanced bonding, while the central region maintains the standard electrode structure, optimizing performance where needed without unnecessary complexity
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 proposed negative electrode design improves the binding force and facilitates better lithium deposition, thereby enhancing the energy density and safety of the all-solid-state battery.
Implementation Method 1
a binder layer continuously or discontinuously along an edge of the current collector, which helps in lithium ion deposition and enhances the binding force between the negative electrode coating layer and the current collector
Implementation Method 2
the negative electrode coating layer, and a binder layer continuously or discontinuously along an edge of the current collector, which helps in lithium ion deposition
Data Source
AI summary
A negative electrode for an all-solid-state battery and an all-solid-state battery including the negative electrode for an all-solid-state battery, the negative electrode includes a current collector; a negative electrode coating layer on the current collector; and a binder layer continuously along or discontinuously along an edge of the current collector.