Lithium-Ion Battery Anode with Vertical Pores for Fast Charging
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Solution Overview
Problem
Lithium ion secondary batteries face decreased capacity and increased resistance during high C-rate charging due to lithium ions moving through pores in the anode active material, which are often oriented parallel to the current collector, leading to inefficient charging and discharging processes.
Innovation Solution
An anode with an anode mixture layer where pores are oriented perpendicularly to the current collector, achieved by applying a magnetic field to the anode mixture, resulting in a Z-tensor value of 0.33 or more, facilitating easier lithium ion insertion and deintercalation and improving charging/discharging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If anode active material is oriented parallel to the current collector, then manufacturing process is simple, but lithium ion movement distance increases and resistance increases
Solution Approach 1:
The invention changes the orientation dimension of pores from parallel (horizontal) to perpendicular (vertical) relative to the current collector. This dimensional change shortens the lithium ion movement path from traversing the entire electrode thickness horizontally to moving vertically through the pore structure, thereby reducing resistance while maintaining manufacturing feasibility through controlled drying and rolling processes.
2Reliability
If anode active material is oriented vertically to the current collector, then lithium ion movement distance is shortened and resistance is lowered, but manufacturing process complexity increases
Solution Approach 1:
The invention applies preliminary actions during the coating and drying stages to establish vertical pore orientation before final electrode formation. By controlling the drying process to create vertical capillary structures and applying controlled rolling pressure, the desired vertical orientation is achieved during manufacturing rather than requiring complex post-processing steps, thus managing process complexity while achieving the performance benefit.
3Speed
If charging is performed at high C-rate, then charging speed increases, but lithium salt plating occurs on electrode surface and capacity decreases
Solution Approach 1:
The invention utilizes a porous anode structure with vertically oriented pores that facilitate rapid lithium ion transport to the electrode interior. The vertical pore architecture creates direct channels for lithium ions to reach active material sites quickly during high C-rate charging, preventing surface accumulation and plating. This porous structure maintains capacity by ensuring uniform lithium distribution even at high charging speeds.
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 perpendicular orientation of pores in the anode mixture layer reduces diffusion resistance and enhances charging/discharging efficiency at high rates, maintaining capacity retention and improving rapid charging performance.
Implementation Method 1
a technique, in which a magnetic field is applied to orient an anode active material vertically with respect to an anode current collector
Data Source
AI summary
The present disclosure relates to an anode for a secondary battery, a method of manufacturing the anode, and a lithium ion secondary battery including the anode. The anode includes an anode mixture layer on at least one surface of an anode current collector, with pores inside the anode mixture layer having a Z-tensor value of 0.33 or more. In addition, a method of manufacturing the anode and a lithium ion secondary battery including the anode are provided.