Aluminum Current Collector Texture Control for Li Battery Stability
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Solution Overview
Problem
Existing aluminum substrates for rechargeable lithium battery positive electrode current collectors face challenges in achieving optimal physical properties such as microstrain, texture fraction, and tensile strength, which affect their electrochemical stability and processibility.
Innovation Solution
The development of an aluminum substrate with a microstrain of about 0.04% to 0.11% and a (220) plane texture fraction of 60% to 85%, optimized for use as a positive electrode current collector in rechargeable lithium batteries, is proposed. This substrate is manufactured by adjusting raw materials, temperature, and pressure conditions in thin-filming and drying processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional aluminum substrates are used for positive electrode current collectors, then manufacturing cost is reduced and ease of manufacture is improved, but electrochemical stability and physical properties (microstrain, texture fraction, tensile strength) are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling microstrain (0.03-0.12%), texture fraction of (220) plane (60-85%), and tensile strength (200-350 MPa) of the aluminum substrate through manufacturing process optimization. These parameter adjustments resolve the contradiction by achieving superior electrochemical stability without compromising manufacturability, as the substrate maintains compatibility with existing battery manufacturing equipment and processes.
Solution Approach 2:
The patent implements local quality by creating specific crystallographic texture distribution within the aluminum substrate, particularly the (220) plane orientation. This localized structural characteristic enhances electrochemical stability at the interface with electrode materials while maintaining overall substrate manufacturability using conventional rolling and annealing processes.
2Strength
If aluminum substrate microstrain is increased to improve tensile strength, then mechanical strength is improved, but texture fraction and processibility may deteriorate
Solution Approach 1:
The patent resolves this contradiction through multi-parameter optimization, simultaneously controlling microstrain (0.03-0.12%) and texture fraction (60-85%) within specific ranges. This approach achieves tensile strength of 200-350 MPa while maintaining proper crystallographic orientation for manufacturability, demonstrating that isolated parameter adjustment is insufficient and coordinated control is necessary.
Solution Approach 2:
The patent applies dynamics by optimizing the interaction between microstrain and texture fraction parameters during the manufacturing process. The dynamic balance between these parameters ensures that tensile strength enhancement through microstrain adjustment does not compromise texture fraction control, allowing the substrate to meet both mechanical strength and manufacturing precision requirements.
3Reliability
If aluminum substrate is optimized for electrochemical stability, then battery performance is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges for microstrain (0.03-0.12%), texture fraction (60-85%), and tensile strength (200-350 MPa) that can be achieved through optimized conventional manufacturing processes. This approach improves electrochemical stability without requiring fundamentally new manufacturing technologies, thereby limiting the increase in manufacturing process complexity to parameter optimization rather than process redesign.
Data Source
AI summary
Provided are an aluminum substrate for a rechargeable lithium battery current collector, and an electrode and a rechargeable lithium battery including the same, the aluminum substrate having a microstrain of about 0.04% to about 0.11% according to Lab source Powder XRD, or a texture fraction of a (220) plane diffraction line of about 60% to about 85% according to Lab source Powder XRD.