Textured Copper Foil for Thermally Stable Li-Ion Current Collectors

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Solution Overview

Problem

Lithium ion secondary batteries face issues with thermal deterioration and mechanical strength degradation of copper foils due to repeated charging-discharging cycles, leading to reduced reliability and lifespan.

Innovation Solution

A copper foil with controlled texture coefficients of crystal planes (220) and (311) to enhance tensile strength and stability, combined with a rust-proof layer, is developed to withstand thermal conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional copper foil is used in lithium ion secondary batteries, then the battery can operate normally during charging-discharging cycles, but the copper foil undergoes thermal deterioration and mechanical strength degradation due to heat generation and repeated expansion-shrinkage of active material

Engineering Contradiction:

Improvebattery reliabilityVSAvoidcopper foil tensile strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the crystallographic orientation parameters of copper foil by controlling the texture coefficients TC(220) ≥ 1.36 and TC(311) ≥ 0.79. This parameter change in crystal structure leads to significant improvement in tensile strength (≥50 kg/mm²) and resistance to thermal deterioration, directly resolving the contradiction between maintaining reliability under cycling conditions and preserving mechanical strength.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If copper foil structure is insufficiently tolerant of thermal and mechanical stress, then the copper foil is prone to damage during charging-discharging cycles, but enhancing the structure may increase manufacturing complexity

Engineering Contradiction:

Improvecopper foil tolerance to charging-discharging cyclesVSAvoidcopper foil structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Rather than complicating the copper foil structure with multiple layers or coatings, the patent achieves enhanced tolerance by changing the crystallographic orientation parameters (texture coefficients). This parameter change approach improves reliability while avoiding increased structural complexity and manufacturing complexity.

Inventive Principle:

Principle #35Parameter changes

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 copper foil maintains high tensile strength and low deterioration rate under thermal stress, improving the reliability and durability of lithium ion secondary batteries.

Implementation Method 1

Lithium ion secondary batteries generate heat during charging-discharging cycles, which may cause the thermal deterioration of the copper foil, resulting in a significant declined mechanical strength

Methodology Applied

Scientific EffectThermal deterioration resistance:

Implementation Method 2

the expansion and shrinkage of an active material during the charging-discharging cycles may apply stress on the copper foil repeatedly

Methodology Applied

Scientific EffectMechanical stress tolerance:

Data Source

PatentUS20250279435A1Copper foil and current collector for lithium ion secondary battery and lithium ion secondary battery

Publication Date: 2025.09.04 CHANG CHUN PETROCHEMICAL CO LTD

AI summary

Provided is an copper foil for lithium ion secondary batteries having two opposite sides, wherein the copper foil has a texture coefficient of crystal plane (220) “TC (220)” of ≥1.36 and a texture coefficient of crystal plane (311) “TC (311)” of ≥0.79. The present disclosure further provides a current collector for lithium ion secondary batteries and a lithium ion secondary battery including the same.