LiNO3-Protective Negative Electrode for Dendrite Suppression
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Solution Overview
Problem
Rechargeable lithium batteries face issues with lithium dendrite growth, which reduces their lifecycle and safety.
Innovation Solution
A negative electrode with a protective layer containing LiNO3 is used to form a stable solid electrolyte interphase (SEI) film, reducing or suppressing dendrite growth and improving battery lifecycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional negative electrode is used in rechargeable lithium batteries, then the battery can operate and provide energy storage, but lithium dendrites grow on the negative electrode surface during charging, reducing battery lifecycle and safety
Solution Approach 1:
A protective layer comprising LiNO3 is introduced as an intermediary between the negative electrode active material layer and the electrolyte solution. This protective layer acts as a mediator that forms a stable SEI film, preventing direct harmful interactions between lithium ions and the negative electrode surface, thereby suppressing dendrite growth while maintaining ion conductivity.
Solution Approach 2:
The protective layer is formed in advance on the negative electrode active material layer before the battery operates. This preliminary formation of a stable SEI film prevents lithium dendrite nucleation and growth during subsequent charging cycles, addressing the harmful effect before it can occur.
2Reliability
If a protective layer comprising LiNO3 is formed on the negative electrode active material layer, then lithium dendrite growth is suppressed and battery lifecycle is improved, but the device structure becomes more complex
Solution Approach 1:
The protective layer is implemented as a thin film coating on the negative electrode active material layer. This thin film approach provides the necessary protective function against dendrite growth while minimizing structural complexity and maintaining a compact battery design.
Solution Approach 2:
The negative electrode is constructed as a composite structure combining the negative electrode active material layer with the protective layer comprising LiNO3. This composite material approach integrates multiple functions (energy storage and dendrite protection) into a unified structure, reducing overall device 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 SEI film formed by LiNO3 enhances battery performance by increasing ion conductivity and heat resistance, leading to improved lifecycle and capacity retention at both room and high temperatures.
Implementation Method 1
a stable solid electrolyte interphase (SEI) film is formed by LiNO3, thereby reducing or suppressing the growth of lithium dendrites
Implementation Method 2
lithium ions are intercalated and deintercalated from the positive electrode and the negative electrode
Implementation Method 3
the rechargeable lithium batteries generate electrical energy through oxidation and reduction reactions when lithium ions are intercalated and deintercalated
Data Source
AI summary
Disclosed are a negative electrode for a rechargeable lithium battery, and a rechargeable lithium battery including the negative electrode. The negative electrode includes a negative electrode current collector, a negative electrode active material layer on the negative electrode current collector, and a protective layer on the negative electrode active material layer and including LiNO3 and a binder.