Nitroxyl Polymer Cathode Suppressing Lithium Dendrites
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Solution Overview
Problem
Power storage devices using a lithium or lithium alloy anode experience a significant decrease in capacity due to lithium dendrite formation, leading to 'dead' lithium that cannot contribute to discharge during charge-discharge cycles.
Innovation Solution
A power storage device design featuring a nitroxyl polymer with specific chemical structures in the cathode, which is in direct contact with the lithium or lithium alloy anode, exhibiting a catalytic effect that suppresses dendrite growth and improves cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a lithium or lithium alloy anode is used in a power storage device with a nitroxyl polymer cathode, then the device can achieve high capacity, but the capacity greatly decreases by repeating charge-discharge cycles due to dendrite formation
Solution Approach 1:
The patent introduces a catalyst layer containing metal particles (such as Au, Ag, Pt, or their alloys) as an intermediary between the lithium anode and the nitroxyl polymer cathode. This catalyst layer mediates the electrochemical reactions, promoting uniform lithium ion insertion and extraction, thereby suppressing dendrite formation while maintaining high capacity during charge-discharge cycles
Solution Approach 2:
The patent modifies the chemical and physical parameters of the electrode interface by introducing catalytic metal particles with specific properties (conductivity, catalytic activity, particle size 0.1-10 μm). These parameter changes alter the reaction kinetics and lithium deposition behavior, transforming the harmful dendrite growth into uniform plating, thus improving cycle stability
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 direct contact between the nitroxyl polymer cathode and lithium or lithium alloy anode enhances the cycle properties of the power storage device, maintaining capacity over multiple charge-discharge cycles.
Implementation Method 1
The nitroxyl polymer in contact with a lithium or lithium alloy anode exhibits a catalytic effect on the surface of the lithium or lithium alloy anode, thereby suppressing dendrite growth on the anode surface
Implementation Method 2
employing a reaction for transferring an electron between the two states represented by the following equation (B) as an electrode reaction of the cathode
Data Source
AI summary
An object of the present invention is to provide a power storage device with excellent cycle property, employing a cathode containing a nitroxyl polymer. To attain the object in the present invention, in the power storage device employing a cathode comprising a nitroxyl polymer, a lithium or lithium alloy anode is used as an anode active material and the cathode is in direct contact with the anode.