Copper Bonded Anode Lead for Silicon Battery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for forming an active material layer on a current collector using vapor-phase deposition result in complex device structures, increased electrical resistance, and fluctuation in battery voltage and capacity due to poor contact characteristics between the active material layer and the anode lead, especially when using nickel anode leads.
Innovation Solution
Using a copper or copper alloy bond between the anode lead and the active material layer to improve contact characteristics and prevent increased electrical resistance, allowing for a more reliable and efficient battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an anode lead made of nickel (Ni) is welded to the active material layer, then weldability is improved, but contact characteristics are lowered and electrical resistance is increased
Solution Approach 1:
The anode lead is constructed as a composite structure with a nickel base material (for weldability) and a copper coating layer (for electrical conductivity and contact characteristics). This composite structure combines the advantages of both materials to resolve the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The copper coating is applied locally on the surface of the nickel anode lead, specifically at the bonding region with the active material layer. This local quality change provides excellent electrical contact where needed while maintaining the nickel's weldability properties in the bulk material.
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 or copper alloy bond between the anode lead and the active material layer enhances contact characteristics, reduces electrical resistance, and stabilizes battery voltage and capacity, improving the overall performance and reliability of the battery.
Implementation Method 1
an anode lead is bonded to the active material layer with a bond made of copper or an alloy containing copper in between... contact characteristics between the active material layer and the anode lead are improved, and electrical resistance is prevented from increasing
Implementation Method 2
forming an active material layer on a current collector by vapor-phase deposition method... Silicon or the like is largely expanded and shrunk due to charge and discharge, and thus there has been a disadvantage that the cycle characteristics are lowered due to pulverization
Data Source
AI summary
An anode which can improve contact characteristics between an active material layer and anode lead and can prevent electrical resistance from increasing, a method of manufacturing the anode, and a battery including the anode are provided. An active material layer containing silicon as an element is provided on a current collector. An anode lead is bonded to the active material layer. At least part of a bond region between the anode lead and the active material layer is made of copper or an alloy containing copper. Thereby, the electrical resistance can be prevented from being increased even though the anode lead is bonded to the active material layer. The anode lead may be made of copper or an alloy containing copper. Otherwise, coating layer made of copper or an alloy containing copper may be provided on the surface of a base.