Microporous Carbon Negative Electrode for Uniform Metal Deposition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Anode-free metal batteries suffer from low Coulombic efficiency and short cycle life due to uneven metal deposition and dendrite growth on the negative electrode, which affects energy density and stability.
Innovation Solution
A negative electrode with a flexible carbon material coating containing micropores less than 0.8 nm and a specific pore volume ratio (Vmic:Vtotal≥65:100) is used, which serves as initial nucleation sites for metal deposition, regulating morphology and reducing dendrite formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If anode-free metal batteries are used to achieve high energy density, then energy density is improved, but Coulombic efficiency deteriorates and cycle life shortens due to uneven metal deposition and dendrite growth
Solution Approach 1:
The patent employs flexible carbon material with specifically engineered micropores (pore diameter ≤0.8 nm, Vmic:Vtotal≥65:100) to create a porous negative electrode structure. These micropores serve as nucleation sites that guide uniform metal deposition, preventing dendrite formation while maintaining high energy density anode-free battery design
Solution Approach 2:
The patent creates local quality differences by concentrating micropores at specific locations within the carbon material structure. The heterogeneous pore distribution provides preferential nucleation sites that locally control metal deposition behavior, ensuring uniform coverage while maintaining overall high energy density
2Manufacturing precision
If flexible carbon material with micropores is used to regulate metal morphology, then deposition uniformity is improved, but manufacturing complexity increases due to precise pore structure control requirements
Solution Approach 1:
The patent achieves precise pore structure control by adjusting synthesis parameters including heat treatment temperature (600-1000°C), oxygen content (15-40%), and treatment time (1-3 hours). These parameter changes enable systematic control of micropore formation without requiring complex post-processing steps
Solution Approach 2:
The patent performs preliminary heat treatment of carbon material before battery assembly to pre-form the required micropore structure. This preliminary action ensures the negative electrode is ready for uniform metal deposition from the first cycle, eliminating the need for additional processing steps during battery manufacturing
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 facilitates uniform metal layer formation, enhancing energy density and cycling performance by lowering nucleation barriers and reducing dendrite growth, thereby improving battery stability and efficiency.
Implementation Method 1
These micropores are typically located at the positions of edge carbon atoms in the flexible carbon material, which can reduce an overpotential of a metal (such as sodium), and serve as initial nucleation sites during deposition of a metal
Implementation Method 2
The flexible carbon material may exhibit excellent conductivity and stability, enabling the construction of an effective conductive network in the negative electrode
Data Source
AI summary
This application provides a negative electrode and a preparation method therefor, a battery cell containing the same, a battery, and an electric apparatus, where the negative electrode includes a negative electrode current collector and a coating disposed on at least one surface of the negative electrode current collector, the coating includes a flexible carbon material, the flexible carbon material includes micropores with a pore diameter less than or equal to 0.8 nm, a pore volume of the micropores with a pore diameter less than or equal to 0.8 nm is denoted as Vmic, a pore volume of the flexible carbon material is denoted as Vtotal, both in units of cm3/g, and Vmic:Vtotal≥65:100.