Metal-Ion-Philic Anode Layer for Lithium Dendrite Containment
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Solution Overview
Problem
Lithium dendrites deposit between the separator and the anode material during charge-discharge cycling, forming a tippy or pointy structure that can pierce the separator and cause a short circuit in lithium-ion batteries.
Innovation Solution
Incorporating a metal-ion-philic layer between the anode current collector and the anode active material to induce lithium dendrites to deposit between them, preventing them from piercing the separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lithium-ion battery structure is used without metal-ion-philic layer, then battery structure is simple, but lithium dendrites pierce the separator causing short circuit
Solution Approach 1:
A metal-ion-philic layer is introduced as an intermediary between the anode current collector and the anode active material. This intermediate layer selectively attracts and deposits metal ions, preventing dendrite formation that would otherwise pierce the separator and cause short circuits, thereby improving battery safety without fundamentally redesigning the entire anode structure
Solution Approach 2:
The metal-ion-philic layer is pre-formed on the anode current collector before battery operation. This preliminary structure prepares the anode surface to selectively deposit metal ions during charging, preventing dendrite growth before it can become hazardous, thus proactively addressing the safety issue
2Reliability
If metal-ion-philic layer is added to prevent dendrite piercing, then battery safety is improved, but anode structure complexity increases
Solution Approach 1:
The metal-ion-philic layer is applied locally at the interface between the current collector and active material, specifically where dendrite initiation occurs. This localized modification targets the critical failure point without requiring changes to the entire anode structure, minimizing added complexity while maximizing safety improvement
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
Prevents lithium dendrites from piercing the separator, enhancing the safety of lithium-ion batteries by mitigating the risk of short circuits, especially during overcharging cycles.
Implementation Method 1
a metal-ion-philic layer is positioned between the anode current collector and the anode active material
Implementation Method 2
lithium dendrites deposit between the separator and the anode material during charge-discharge cycling
Data Source
AI summary
A method for enhancing the safety of a metal-ion electrochemical device comprises steps of providing a metal-ion electrochemical device that at least includes a positive electrode, a negative electrode, and a separator disposed therebetween; the negative electrode comprises a negative electrode current collector coated with a negative electrode active material, and a metal-ion-affinitive layer is positioned between the negative electrode current collector and the negative electrode active material; charging and discharging the metal-ion electrochemical device to induce the deposition of a metal-ion dendrite layer between the negative electrode active material and the metal-ion-affinitive layer. By introducing the metal-ion-affinitive layer, the present invention effectively restricts the deposition of lithium dendrites between the negative electrode current collector and the negative electrode active material under normal, overcharging, or rapid charging and discharging conditions. This significantly reduces the risk of contact and penetration of the separator by lithium metal dendrites preventing battery short circuits.