Copper Current Collector Crystal Orientation for Silicon Anode Adhesion
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Solution Overview
Problem
Lithium ion secondary batteries using silicon as the anode active material face challenges in maintaining cycle characteristics due to the separation of the active material layer from the current collector, caused by expansion and shrinkage during charge and discharge, leading to reduced battery performance.
Innovation Solution
A copper current collector with a specific intensity ratio of X-ray diffraction peaks (I(200)/I(111) between 0.5 and 1.5 is used, enhancing the contact characteristics between the current collector and the active material layer, thereby preventing separation and improving cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon is used as the anode active material to achieve high capacity, then the battery capacity is improved, but the active material layer separates from the current collector during charge and discharge cycles
Solution Approach 1:
The invention changes the crystallographic orientation parameters of the copper current collector by controlling the ratio I(200)/I(111) to be 0.05 or more, which fundamentally alters the surface atomic arrangement and contact characteristics with the silicon active material layer, preventing separation during volume changes
Solution Approach 2:
The invention creates a composite structure where silicon active material is deposited on a copper current collector with specific crystal orientation, forming an integrated system where the copper substrate provides mechanical stability and electrical conductivity while the silicon layer provides high capacity
2Quantity of substance
If the active material layer is deposited by vapor-phase deposition method to achieve high performance, then the battery capacity is improved, but the contact between the active material layer and current collector deteriorates
Solution Approach 1:
The invention changes the surface parameters of the current collector by controlling crystal orientation (I(200)/I(111) ratio), which improves the interfacial contact characteristics and adhesion between the vapor-deposited active material layer and the current collector substrate
Solution Approach 2:
The invention performs preliminary preparation of the current collector surface by controlling its crystal orientation before depositing the active material layer, ensuring optimal contact characteristics are established in advance to prevent subsequent separation
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 use of a copper current collector with the specified intensity ratio improves the contact and binding characteristics, leading to enhanced cycle performance and discharge capacity retention in lithium ion secondary batteries using silicon as the anode active material.
Implementation Method 1
ratio I (200)/I (111) between intensity I (200) of a peak originated in (200) crystal plane of copper obtained by X-ray diffraction and intensity I (111) of a peak originated in (111) crystal plane thereof
Data Source
AI summary
A battery capable of improving the cycle characteristics is provided. A current collector containing copper (Cu), in which ratio I (200)/I (111) between intensity I (200) of a peak originated in (200) crystal plane of copper obtained by X-ray diffraction and intensity I (111) of a peak originated in (111) crystal plane thereof is in the range from 0.5 to 1.5.