Lithium-Ion Electrode Coating for Low-Resistance High Loading
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Solution Overview
Problem
Conventional lithium-ion battery cells face challenges in achieving low resistance and high loading capabilities due to the limitations of polymeric binders, which affect the alignment and conductivity of graphite flakes, leading to reduced efficiency in electrical energy storage and charging performance.
Innovation Solution
The use of high aspect ratio nano-sized carbon materials and flake graphite with statistically oriented edge planes towards the current collector, either with or without polymeric binders, to enhance attractive forces and reduce lithium-ion diffusion resistance, allowing for high-loading designs without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric binders are used in conventional electrode coatings, then the structural integrity of the electrode is maintained, but the alignment of graphite flakes is poor and resistance increases
Solution Approach 1:
The patent removes polymeric binders from the electrode coating formulation entirely, replacing them with a slurry-based coating method that uses only conductive materials and solvents. This extraction eliminates the resistance-causing binder while maintaining electrode integrity through alternative coating architecture.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrode coating by eliminating polymeric binders and using a slurry formulation with specific conductivity and viscosity characteristics. This parameter change enables both low resistance and adequate structural integrity.
2Ease of manufacture
If graphite flakes are randomly oriented in the electrode coating, then the manufacturing process is simple, but the electrical conductivity and charging performance are reduced
Solution Approach 1:
The patent applies a magnetic field during the coating process to preliminarily orient graphite flakes in the desired direction before the coating dries. This preliminary action aligns the flakes to enhance conductivity while maintaining manufacturing simplicity through a single-step coating process.
Solution Approach 2:
The patent replaces mechanical mixing and alignment methods with a magnetic field-based orientation system. This substitution allows for precise control of flake alignment without complex mechanical processing steps.
3Quantity of substance
If high loading of active materials is used, then the battery capacity increases, but the resistance and temperature-related side reactions increase
Solution Approach 1:
The patent uses composite material formulations in the electrode slurry, combining conductive materials, active materials, and functional additives in specific ratios. This composite approach enables high active material loading while maintaining low resistance through optimized material interactions and distribution.
4Reliability
If conventional electrode coating methods are used, then the production process is established and reliable, but the alignment control of graphite flakes toward the current collector is insufficient
Solution Approach 1:
The patent replaces conventional mechanical coating methods with a magnetic field-assisted slurry coating process. This substitution maintains manufacturing reliability while achieving precise control over graphite flake orientation through magnetic alignment during the coating application.
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
This configuration enables improved battery power and charging performance by reducing polymeric binder usage, enhancing silicon content, and controlling lithium-ion intercalation paths, resulting in faster charging cycles and reduced temperature-related side reactions.
Implementation Method 1
The conductive material includes a high aspect ratio nano-sized carbon material configured for providing attractive forces between components of the electrode coating
Implementation Method 2
drying the electrode coating slurry upon the current collector in a presence of a magnetic field to statistically orient the edge planes of the plurality of flakes toward the surface
Data Source
AI summary
A system including a lithium-ion battery cell is disclosed. The lithium-ion battery cell includes a first electrode. The first electrode includes a current collector including a surface and an electrode coating formed from an electrode coating slurry and disposed on the current collector. The electrode coating slurry includes a plurality of flakes of flake graphite. Each of the plurality of flakes includes two parallel planar surfaces and an edge plane defined by the two parallel planar surfaces. The edge planes of the plurality of flakes are statistically facing toward the surface of the current collector. The first electrode further includes a conductive material including a high aspect ratio nano-sized carbon material. The carbon material is configured for providing attractive forces between components of the electrode coating. The lithium-ion battery cell further includes a second electrode, a separator disposed between the first electrode and the second electrode, and an electrolyte.