Elastic Anode Current Collector for Stable Solid-State Battery Contact
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Solution Overview
Problem
The coulomb efficiency of all solid state batteries is compromised due to variations in the thickness of the anode active material layer during charge and discharge, as the ion and electron conductive paths are easily interrupted.
Innovation Solution
Incorporating an anode current collector with an elastic part on the other side of the solid electrolyte layer, which has an elastic modulus between 2.14×10^3 N/mm^2 and 4.08×10^3 N/mm^2, and electron conductivity of 1×10^-5 S/cm or more, to maintain effective contact and prevent path interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the anode active material layer thickness is reduced upon discharge, then the battery capacity is improved, but the ion conductive path and electron conductive path are interrupted causing lowered coulomb efficiency
Solution Approach 1:
The anode current collector is designed with elastic deformation capability, allowing it to dynamically adjust its shape during charge and discharge cycles. The elastic portion deforms to follow the thickness changes of the anode active material layer, ensuring continuous contact and maintaining conductive paths throughout the battery operation
Solution Approach 2:
The elastic modulus of the anode current collector is specifically controlled within the range of 2.14×10³ to 4.08×10³ N/mm². This parameter optimization allows the current collector to exhibit appropriate elasticity - soft enough to deform with the active material layer thickness changes, yet rigid enough to maintain structural integrity and continuous conductive paths
2Reliability
If an elastic portion is added to the anode current collector, then the coulomb efficiency is improved through maintained contact, but the device complexity increases
Solution Approach 1:
Only a specific portion of the anode current collector is designed with elastic properties, while other portions maintain their traditional structure. This localized elasticity approach addresses the contact maintenance problem only where the anode active material layer thickness varies, without unnecessarily complicating the entire current collector structure
Solution Approach 2:
The anode current collector is constructed as a composite structure combining materials with different mechanical properties. The elastic portion uses materials with specific elastic modulus characteristics, while other portions may use traditional conductive materials, creating a composite structure that balances elasticity, conductivity, and structural stability
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
This configuration enhances the coulomb efficiency of the all solid state battery by ensuring stable ion and electron conductive paths even with variations in anode active material layer thickness, while preventing the elastic part from reacting with Li and deteriorating.
Implementation Method 1
the anode current collector includes a current collection part, and an elastic part placed on other side of the solid electrolyte layer, with respect to the current collection part
Data Source
AI summary
A main object of the present disclosure is to provide an all solid state battery with high coulomb efficiency even when the thickness of an anode active material layer is varied due to charge and discharge. The above object is achieved by providing an all solid state battery comprising: a power generation element including a cathode, a solid electrolyte layer, and an anode, in this order, and an exterior body storing the power generation element, and the anode includes at least an anode current collector, and the anode current collector includes a current collection part, and an elastic part placed on other side of the solid electrolyte layer, with respect to the current collection part.