Layered Battery Electrode Balancing Energy and Power Density
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Solution Overview
Problem
Current battery electrodes for electric vehicles face a trade-off between energy density and power density, with optimization for one parameter often compromising the other, leading to suboptimal performance in both energy storage and power delivery.
Innovation Solution
A layered battery electrode design featuring multiple electrode layers with distinct characteristics, where one layer is optimized for high energy density with higher viscosity and solid content, and another for high power density with lower viscosity, along with the use of buffer layers to enhance adhesion and conductivity, is employed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a battery electrode is optimized for high energy density, then energy storage capacity is improved, but power delivery capability deteriorates
Solution Approach 1:
The battery electrode is divided into multiple distinct layers, with at least one first layer and one second layer having different material characteristics. The first layer is optimized for energy density while the second layer is optimized for power density, allowing both functions to coexist in a single electrode structure.
Solution Approach 2:
Different regions of the electrode (different layers) are given different material properties and compositions. The first layer contains materials optimized for energy storage while the second layer contains materials optimized for power delivery, creating local functional specialization within the electrode.
2Quantity of substance
If slurry viscosity is increased to improve energy density, then solid content increases, but coating uniformity and surface morphology deteriorate
Solution Approach 1:
The electrode is segmented into multiple layers, each with different slurry viscosities and solid contents. The first layer uses high viscosity slurry with high solid content for energy density, while the second layer uses lower viscosity slurry for better coating uniformity and surface morphology.
Solution Approach 2:
The viscosity and solid content parameters of the slurry are changed between layers. The first layer employs higher viscosity and solid content while the second layer uses lower viscosity, optimizing both energy density and surface quality through parameter variation.
Data Source
AI summary
An apparatus can include a layered electrode. The layered electrode can include a current collector material including a first side. The layered electrode can include a first electrode layer applied to the first side of the current collector material, the first electrode layer including a first applied viscosity of a first slurry. The layered electrode can include a second electrode layer applied to the first electrode layer, the second electrode layer including a second applied viscosity of a second slurry. The first applied viscosity of the first slurry can be greater than the second applied viscosity of the second slurry.