HB Interlayer in Secondary Batteries for Uniform Lithium Deposition
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Solution Overview
Problem
Secondary batteries with deposition type metallic lithium negative electrodes face issues of non-uniform lithium deposition and decreased Coulomb efficiency due to uneven lithium distribution between the electrolyte layer and the negative electrode current collector during charging and discharging.
Innovation Solution
Incorporating an intermediate layer containing hydrogen boride (HB) between the electrolyte layer and the negative electrode current collector, which facilitates uniform lithium deposition and improves Coulomb efficiency by occluding and releasing lithium ions during charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metallic lithium is deposited between the electrolyte layer and the negative electrode current collector during charging, then the battery capacity increases, but the lithium deposition becomes non-uniform and Coulomb efficiency decreases
Solution Approach 1:
An intermediate layer containing hydrogen boride (HB) is introduced between the electrolyte layer and the negative electrode current collector. This intermediate layer acts as a mediator that promotes uniform lithium ion distribution during deposition, preventing non-uniform lithium accumulation while maintaining high battery capacity. The HB-containing layer facilitates controlled lithium ion transport and uniform deposition morphology.
Solution Approach 2:
The intermediate layer is specifically positioned at the critical interface between the electrolyte and current collector where lithium deposition occurs. By modifying the local properties of this specific region with HB-containing material, the patent creates a favorable environment for uniform lithium deposition without affecting the overall battery structure or other functional layers.
2Reliability
If an intermediate layer containing hydrogen boride is added between the electrolyte layer and the negative electrode current collector, then uniform lithium deposition is achieved and Coulomb efficiency increases, but the device structure becomes more complex
Solution Approach 1:
The negative electrode structure is segmented into distinct functional layers: the electrolyte layer, the HB-containing intermediate layer, and the negative electrode current collector. This segmentation allows each layer to perform its specific function optimally - the intermediate layer specifically addresses lithium deposition uniformity while the other layers maintain their respective roles, achieving high Coulomb efficiency through functional specialization.
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 an HB intermediate layer ensures uniform metallic lithium deposition and dissolution, enhancing the battery's Coulomb efficiency and preventing irreversible capacity, thus improving the battery's performance and durability.
Implementation Method 1
facilitates uniform lithium deposition and improves Coulomb efficiency by occluding and releasing lithium ions during charging and discharging
Implementation Method 2
metallic lithium as a negative electrode active material that is deposited between the electrolyte layer and the negative electrode current collector by charging
Data Source
AI summary
A secondary battery of the present disclosure includes a positive electrode, an electrolyte layer, a negative electrode current collector, and metallic lithium as a negative electrode active material that is deposited between the electrolyte layer and the negative electrode current collector by charging, an intermediate layer is present between the electrolyte layer and the negative electrode current collector, and the intermediate layer contains hydrogen boride.