Lithium Metal Electrode Pulsing for Uniform Dendrite-Free Deposition
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Solution Overview
Problem
Lithium metal anodes in batteries face challenges due to irreversible dendrite growth, leading to reduced capacity, increased surface area, and safety concerns, which hinder the practical development of commercial rechargeable Li metal batteries.
Innovation Solution
Applying a series of energy pulses, such as oxidative and reductive pulses, to the lithium metal electrode to treat its surface and prevent or reduce dendrite growth, thereby improving lithium deposition and dissolution processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal anodes are used to achieve high energy density, then gravimetric energy density is improved, but dendrite propagation occurs leading to safety concerns and reduced reliability
Solution Approach 1:
The patent applies periodic electrical pulsing treatment to the lithium metal anode surface. The pulsed current alternates between oxidation and reduction phases, creating periodic electrochemical reactions that modify the surface morphology and prevent dendrite formation during battery cycling, thereby maintaining reliability while preserving high energy density
Solution Approach 2:
The patent performs preliminary electrochemical treatment of the lithium metal anode surface before actual battery operation. By applying oxidation and reduction pulses in advance, the surface is pre-conditioned with a uniform morphology that resists dendrite propagation during subsequent cycling, preventing reliability issues before they occur
2Productivity
If conventional current application is used for lithium deposition, then charging is achieved, but non-uniform dendritic growth occurs reducing capacity
Solution Approach 1:
The patent replaces conventional continuous current application with periodic pulsed current during lithium deposition. The pulsed signal alternates between oxidation and reduction phases, creating periodic electrochemical reactions that promote uniform lithium deposition across the electrode surface while preventing localized dendritic growth, thereby achieving both high capacity and uniform deposition
Solution Approach 2:
The patent changes the electrical parameters from continuous DC current to time-varying pulsed current with specific oxidation and reduction phases. This parameter modification alters the deposition mechanism from continuous growth to periodic dissolution-redeposition cycles, resulting in uniform lithium distribution and preventing dendrite formation while maintaining charging capacity
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 energy pulse treatment enhances the cycling performance of lithium metal electrodes, reduces dendrite formation, and enables uniform and reversible lithium deposition, improving the stability and efficiency of lithium metal batteries.
Implementation Method 1
The first energy pulse is an oxidation pulse and the second energy pulse is a reductive pulse
Implementation Method 2
The first energy pulse is an oxidation pulse and the second energy pulse is a reductive pulse
Implementation Method 3
applying the first energy pulse and the second energy pulse to a lithium metal electrode to electrically treat the lithium metal electrode
Data Source
AI summary
In some example embodiments, there is provided example embodiments related to providing a more uniform lithium deposition based on pulsing. In some example embodiments, there is provided a method including: generating a first energy pulse followed by a second energy pulse; and applying the first energy pulse and the second energy pulse to a lithium metal electrode to electrically treat the lithium metal electrode to reduce and/or eliminate growth of dendrites on at least a portion of a surface of the lithium metal. Related systems, methods, and articles of manufacture are also disclosed.