Cu-Zn Induction Layer Anode for Uniform Lithium Electrodeposition
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Solution Overview
Problem
Lithium metal batteries face issues with large volume change, lithium dendrite growth, and side reactions due to high reactivity, leading to instability and reduced lifespan, while existing lithium-free secondary batteries with current collectors face manufacturing challenges and inefficiencies.
Innovation Solution
A negative electrode for lithium-free secondary batteries is developed, comprising a conductive metal layer with a lithium electrodeposition induction layer containing an intermetallic compound of copper and zinc, formed through electrodeposition and heat treatment, which suppresses lithium dendrite growth and improves electrochemical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is used as negative electrode active material, then energy density is improved, but lithium dendrite growth and stability are worsened
Solution Approach 1:
A zinc layer is introduced as an intermediary between the lithium metal and the electrolyte. This zinc layer acts as a protective barrier that prevents direct contact between lithium metal and the electrolyte, thereby eliminating side reactions and dendrite growth while preserving the high energy density benefits of lithium metal.
Solution Approach 2:
The zinc layer is pre-formed on the lithium metal surface before the battery operates. This preliminary protective layer prevents harmful interactions from occurring in the first place, ensuring stable performance from the initial charging cycle.
2Ease of manufacture
If conventional current collectors are used in lithium-free secondary batteries, then manufacturing simplicity is improved, but lithium dendrite growth and electrochemical performance are worsened
Solution Approach 1:
The current collector is designed as a composite structure with multiple layers: a base current collector layer combined with a zinc-containing induction layer. This composite structure maintains the ease of manufacture of conventional current collectors while adding the functional benefits of zinc for uniform lithium deposition and dendrite suppression.
Solution Approach 2:
The zinc-containing induction layer is applied locally on the surface of the current collector where lithium deposition occurs. This localized modification provides the necessary electrochemical properties for uniform lithium deposition only at the critical interface, while the bulk current collector retains its original manufacturing simplicity.
3Reliability
If current collector surface area is increased to induce uniform lithium deposition, then lithium dendrite growth is suppressed, but device complexity and manufacturing cost are worsened
Solution Approach 1:
Instead of changing the physical geometry of the current collector, the invention changes the chemical composition parameters by introducing zinc into the induction layer. This compositional change modifies the electrochemical properties to promote uniform lithium deposition without increasing structural complexity.
Solution Approach 2:
The invention replaces mechanical/physical approaches (increasing surface area, creating three-dimensional structures) with a chemical approach (using zinc-containing compounds to modify deposition behavior). This substitution achieves uniform lithium deposition through chemical mechanisms rather than mechanical 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 electrode reduces interfacial resistance and overvoltage, enabling uniform lithium electrodeposition, enhancing the life and electrochemical performance of lithium-free secondary batteries, and allowing for a thinner, more efficient battery design.
Implementation Method 1
A negative electrode for lithium-free secondary batteries is developed, comprising a conductive metal layer with a lithium electrodeposition induction layer containing an intermetallic compound of copper and zinc, formed through electrodeposition and heat treatment, which suppresses lithium dendrite growth and improves electrochemical properties.
Implementation Method 2
A negative electrode for lithium-free secondary batteries is developed, comprising a conductive metal layer with a lithium electrodeposition induction layer containing an intermetallic compound of copper and zinc, formed through electrodeposition and heat treatment
Implementation Method 3
lithium-free secondary batteries (or anode-free secondary batteries) that do not form a separate lithium metal layer or other negative electrode active material layer on the negative electrode current collector but form the negative electrode with the negative electrode current collector itself. As lithium is electrodeposited on the negative electrode current collector during charging, such a lithium-free secondary battery can be defined as a battery that utilizes the lithium metal as a negative electrode active material.
Data Source
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AI summary
The present disclosure relates to a negative electrode for lithium-free secondary battery which can improve the electrochemical and life time characteristics of a lithium-free secondary battery, a manufacturing method thereof and a lithium-free secondary battery. The negative electrode may include a conductive metal layer; and a lithium electrodeposition induction layer formed on the conductive metal layer and containing an intermetallic compound in which copper and zinc are bonded.