Multi-Layer Lithium Battery Anode for Ion Transfer and Impregnation
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Solution Overview
Problem
Lithium secondary batteries face challenges in achieving high energy density and high-power performance due to limitations in anode active materials, particularly in terms of adhesion, electrolyte impregnation, and lithium ion transfer efficiency.
Innovation Solution
The development of an anode for lithium secondary batteries featuring a multi-layer structure with at least one oriented layer having a Degree of Divergence (DD) value of 19 or more, optimized through a specific layering configuration and magnetic field application, enhancing lithium ion transfer and electrolyte impregnation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-layer anode active material layer is used, then the structure is simple and easy to manufacture, but the adhesion, electrolyte impregnation, and lithium ion transfer efficiency are insufficient
Solution Approach 1:
The anode active material layer is divided into multiple sub-layers (first anode active material layer, second anode active material layer, third anode active material layer) with different orientations and properties. Each layer serves specific functions: the first layer provides strong adhesion to the current collector, the second layer facilitates electrolyte impregnation, and the third layer enhances lithium ion transfer efficiency. This segmentation resolves the contradiction by improving reliability through functional specialization while managing complexity through systematic layer design.
Solution Approach 2:
Different regions of the anode active material layer are given different local qualities through varied orientations. The first layer has a first orientation optimized for adhesion, the second layer has a second orientation optimized for electrolyte impregnation, and the third layer has a third orientation optimized for lithium ion transfer. This local quality differentiation allows each region to excel at its specific function, resolving the contradiction between reliability and structural complexity.
2Productivity
If the anode active material layer has random orientation, then the manufacturing process is simple, but the lithium ion transfer efficiency and high-rate capability are limited
Solution Approach 1:
The anode active material layers are pre-oriented during the coating process using a magnetic field application device applied before battery assembly. This preliminary orientation action ensures that the lithium ion transfer pathways are optimally aligned from the outset, improving lithium ion transfer efficiency and high-rate capability. The orientation is established in advance during manufacturing, resolving the contradiction between productivity and manufacturing precision by incorporating orientation control into the coating process itself.
3Quantity of substance
If the anode is optimized for high energy density, then the capacity is increased, but the high-power performance and rate capability are compromised
Solution Approach 1:
The invention transitions from a single-layer two-dimensional structure to a multi-layer three-dimensional structure with different orientations. This dimensional change allows the anode to simultaneously achieve high energy density through increased active material content and high-power performance through optimized lithium ion transfer pathways in different spatial dimensions. The multi-layer configuration with varied orientations creates multiple parallel pathways for lithium ion transport, resolving the contradiction between energy density and power performance.
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 improves the battery's high-rate capability, cycle-life characteristics, and energy density by ensuring effective lithium ion transfer and electrolyte impregnation, making it suitable for high-power applications.
Implementation Method 1
the anode active material layer has a multi-layer structure of three or more layers, and at least one layer of the anode active material layer is an oriented layer having a DD (Degree of Divergence) value defined by Equation 1 of 19 or more
Data Source
AI summary
The present invention relates an anode for a lithium secondary battery and a lithium secondary battery comprising same. The anode for a lithium secondary battery comprises a current collector; and an anode active material layer formed on the current collector and including a carbon-based anode active material, wherein the anode active material layer has a multi-layer structure of three or more layers and at least one layer of the anode active material layer is an oriented layer having a degree of divergence (DD) of 19 or greater, thee DD being defined by the following Equation 1:Degree of Divergence (DD)=(Ia/Itotal)*100Equation 1In Equation 1,Ia is a sum of peak intensities at non-planar angles measured by XRD using a CuKα ray, and,Itotal is a sum of peak intensities at all angles measured by XRD using a CuKα ray.