Composite Lithium Prelithiation for Thin-Layer Content Control
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Solution Overview
Problem
Current prelithiation methods for battery cells face challenges such as excessive complexity, restrictive dimensional limitations, and high costs due to the need for precise control over ultra-thin lithium layers, leading to inefficiencies in lithium storage capacity and increased material loss during the first charge-discharge cycle.
Innovation Solution
A method involving the use of composite lithium, formed by combining lithium with a filler material in a predetermined ratio, which is pressure-processed onto a substrate to create an ultra-thin layer, allowing for controlled lithium content and bypassing minimum thickness constraints of traditional pressure processing machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ultra-thin lithium layers are used for prelithiation, then lithium storage capacity is improved, but manufacturing precision and material thickness control become excessively difficult
Solution Approach 1:
The patent applies composite materials by combining lithium with inert filler materials (such as aluminum oxide, aluminum hydroxide, or ceramic materials) to create a composite lithium layer. This composite structure allows the lithium to provide storage capacity while the filler material provides structural integrity and controllable thickness, resolving the contradiction between achieving ultra-thin lithium layers for high capacity and maintaining manufacturable thickness control.
2Ease of manufacture
If traditional pressure processing machines are used, then manufacturing process is simple, but minimum material thickness constraints limit lithium content control
Solution Approach 1:
The patent changes the physical and chemical parameters of the lithium material by creating a composite with filler materials. This parameter change allows the material to be processed at thicker, more manufacturable thicknesses while still providing the equivalent lithium content of an ultra-thin pure lithium layer, thus maintaining ease of manufacture while improving lithium content control.
3Quantity of substance
If precise control over ultra-thin lithium layers is implemented, then lithium storage capacity is improved, but device complexity and cost increase
Solution Approach 1:
By using composite lithium materials with filler substances, the patent simplifies the manufacturing process while maintaining high lithium storage capacity. The composite structure allows standard pressure processing equipment to achieve the desired lithium distribution without requiring complex ultra-thin layer deposition techniques, thus reducing device complexity and associated costs.
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 approach enhances the first cycle Coulombic efficiency, reduces lithium loss, and improves mechanical properties and cycle life of the battery cells, potentially increasing storage capacity and safety.
Implementation Method 1
The lithium and the filler material are pressure processed onto the substrate and are pressure bonded to the substrate
Data Source
AI summary
Prelithiating a cell with an initial amount of lithium by providing a substrate and generating lithium and a filler material in an amount ratio of filler material to lithium for use as components of a composite lithium. The lithium and the filler material are disposed, by pressure processing using a pressure processing machine, onto the substrate. Disposing of the lithium and the filler material is performed at the same time or sequentially. The substrate with the composite lithium is then placed into the cell.