Carbon-Layer Lithium Anode for Dendrite-Free High-Energy Cells
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Solution Overview
Problem
Next-generation lithium secondary batteries face issues with electrolyte decomposition and lithium dendrite formation, leading to low coulombic efficiency and potential safety hazards due to the growth of three-dimensional lithium metal thin films.
Innovation Solution
A negative electrode comprising a crystalline carbon layer with an amorphous carbon layer and intercalated lithium ions or lithium carbide compounds, formed through plasma treatment and metal organic framework carbonization, to suppress dendrite growth and electrolyte decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a lithium metal negative electrode is used to achieve high capacity and high energy density, then the energy density is improved, but electrolyte decomposition reaction occurs and lithium dendrite formation is induced
Solution Approach 1:
A solid electrolyte interphase (SEI) layer is formed on the surface of the lithium metal negative electrode through preliminary electrochemical reactions. This SEI layer acts as an intermediary between the lithium metal and the electrolyte, preventing direct contact and subsequent decomposition reactions, thereby maintaining high coulombic efficiency while preserving the high energy density benefits of lithium metal electrodes
Solution Approach 2:
The patent applies preliminary coating treatments to the lithium metal negative electrode surface before battery assembly. This preliminary action creates a protective interface layer that prevents electrolyte decomposition and lithium dendrite formation during subsequent battery cycling, ensuring both high energy density and reliable coulombic efficiency
2Area of stationary object
If lithium metal reacts with electrolyte to form solid electrolyte interphase, then the surface area of electrode increases due to lithium dendrite formation, but continuous consumption of lithium metal and electrolyte occurs
Solution Approach 1:
The patent converts the harmful effect of SEI formation into a beneficial protective mechanism. By controlling the initial SEI formation process through surface treatment, the patent creates a stable, thin interphase layer that prevents further electrolyte decomposition and lithium metal consumption, transforming the originally harmful continuous reaction into a controlled, one-time protective event
Solution Approach 2:
The patent modifies the surface properties of the lithium metal electrode through chemical or physical treatment, changing parameters such as surface roughness, composition, or reactivity. This parameter change results in the formation of a stable SEI layer with controlled thickness and composition, preventing excessive lithium metal consumption while maintaining necessary electrode surface area for high capacity
3Reliability
If lithium dendrite penetrates through separator and grows, then internal short circuit may occur, but fire or explosion hazard is caused
Solution Approach 1:
The patent applies preliminary surface treatment to the lithium metal negative electrode that creates a protective interface layer before battery assembly. This preliminary anti-action prevents lithium dendrite formation and growth during battery cycling, stopping the dendrites before they can penetrate the separator and cause internal short circuits or safety hazards
Solution Approach 2:
The patent creates a cushioning protective layer on the lithium metal surface through controlled SEI formation. This beforehand cushioning prevents direct interaction between lithium metal and electrolyte, suppressing dendrite growth and protecting against potential short circuits and safety issues without affecting the battery's energy density
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 solution fundamentally prevents lithium dendrite formation and electrolyte decomposition, enabling high-capacity and high-energy characteristics comparable to conventional lithium metal batteries, suitable for next-generation applications.
Implementation Method 1
an amorphous carbon layer having a network structure on the crystalline carbon layer
Implementation Method 2
a lithium ion or lithium carbide compound intercalated into the amorphous carbon layer
Implementation Method 3
a lithium metal electrodeposited around the lithium ion or lithium carbide compound
Data Source
AI summary
Disclosed is a negative electrode for a lithium secondary battery that enables the provision of a lithium secondary battery having a higher energy density and can fundamentally prevent the electrolyte decomposition reaction and the lithium dendrite formation, a method for manufacturing the same and a lithium secondary battery including the same.