Doped Graphene Oxide Separator for Lithium Plating Control
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Solution Overview
Problem
Lithium plating at the negative electrode in batteries leads to the formation of lithium dendrites, which damage the solid electrolyte interface film and reduce battery performance, and conventional methods focusing on the negative electrode material have reached a bottleneck.
Innovation Solution
A separator with a modification layer containing doped graphene oxide, where the dopant atoms have an electronegativity of 2 or greater, is applied to regulate lithium ion deposition and reduce plating by enhancing the transport and uniformity of lithium ions, using materials like F, N, S, and B atoms, and a sandwich structure with polymer substrates to maintain stability and prevent direct contact with electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional methods focus on improving negative electrode material to reduce lithium plating, then lithium plating degree is reduced, but improvement methods reach a bottleneck and cannot further mitigate the problem
Solution Approach 1:
Instead of continuing to focus improvement efforts on the negative electrode material, this patent inverts the approach by applying the modification layer to the separator. The separator surface is modified with doped graphene oxide, which actively regulates lithium ion deposition behavior, thereby reducing lithium plating from a different component of the battery system rather than the traditional negative electrode material approach
Solution Approach 2:
The patent introduces doped graphene oxide as an intermediary substance on the separator surface. This intermediary layer mediates the interaction between lithium ions and the negative electrode, providing a controlled interface that guides lithium ion deposition and prevents direct harmful contact that would cause plating and dendrite formation
2Manufacturing precision
If dopant atoms with high electronegativity are introduced to regulate lithium ion transport, then lithium ion deposition uniformity is improved, but excessive dopant content may damage the intrinsic structure of graphene oxide
Solution Approach 1:
The patent carefully controls the doping parameters, specifically limiting the dopant content to 1-15 mass% and selecting dopant atoms with electronegativity ≥2.0. This parameter optimization ensures sufficient regulation effect on lithium ion deposition while preventing excessive doping that would damage the graphene oxide structure. The specific electronegativity threshold provides a clear parameter boundary for effective doping
3Object-affected harmful factors
If a modification layer is added to the separator to regulate lithium ion deposition, then lithium plating is reduced, but the separator structure becomes more complex
Solution Approach 1:
The patent applies local quality modification by adding the doped graphene oxide layer only on the separator surface that contacts the negative electrode. This localized modification provides the necessary lithium ion regulation function exactly where it is needed, without unnecessarily complicating the entire separator structure. The modification is confined to the functional interface rather than the whole component
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 separator effectively reduces lithium plating, prevents dendrite growth, and improves battery performance by maintaining structural stability and electrolyte affinity, thereby enhancing the battery's rate and electrical performance.
Implementation Method 1
the dopant atoms have a strong electronegativity and can have a particular inducing effect on the transport of lithium ions
Implementation Method 2
The particle doped graphene oxide and the sheet doped graphene oxide can provide large voids for the transport of lithium ions, which is beneficial to improving the ionic conductivity of the separator
Implementation Method 3
a sandwich structure with polymer substrates to maintain stability and prevent direct contact with electrodes
Data Source
AI summary
This application provides a separator and a preparation method, a battery, and a power consuming apparatus. The separator includes a first separator substrate and a modification layer disposed on a surface of the first separator substrate. The modification layer contains doped graphene oxide, and an electronegativity of dopant atoms in the doped graphene oxide is greater than or equal to 2.