Laser Ablation Lithium Coating for Battery Energy Density
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Solution Overview
Problem
Current lithium-ion battery technologies face challenges such as reduced energy density due to lithium loss during charge-discharge cycles, instability of pre-lithiated materials, and safety risks associated with lithium metal anodes, particularly due to the formation of dendrites and reactive SEI layers.
Innovation Solution
The method employs laser ablation deposition to precisely control the composition and microstructure of lithium-containing materials, enabling the production of dense and porous coating layers with optimized porosity, particle size, and adhesion, which helps in minimizing lithium loss and enhancing the mechanical and electrochemical properties of battery components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If excess lithium is introduced into the cell structure to compensate for lithium loss during charge-discharge cycles, then the energy density is improved, but the safety risk increases due to formation of metallic lithium and dendrites
Solution Approach 1:
A lithium-containing intermediate layer is deposited between the electrode and current collector using laser ablation. This intermediate layer serves as a mediator that provides lithium reservoir function while preventing direct contact and dendrite formation between excess lithium and electrode materials, thus resolving the contradiction between energy density improvement and safety enhancement
Solution Approach 2:
The lithium-containing intermediate layer is designed with controlled porosity to accommodate lithium expansion and contraction during charge-discharge cycles. The porous structure allows lithium ions to move freely while preventing dendrite growth, enabling both high lithium content for energy density and structural stability for safety
2Quantity of substance
If pre-lithiated materials are used to compensate for lithium loss, then the energy density is improved, but the stability deteriorates due to instability of pre-lithiated materials
Solution Approach 1:
The laser-ablated lithium-containing intermediate layer acts as a stable intermediary that gradually releases lithium ions during initial charge-discharge cycles. This intermediate structure provides controlled lithium supplementation without the instability issues of conventional pre-lithiated materials, achieving both lithium compensation and compositional stability
3Manufacturing precision
If laser ablation deposition is used to produce dense coating layers, then the manufacturing precision is improved, but the productivity decreases due to slow deposition rate
Solution Approach 1:
The patent combines multiple laser beams to simultaneously ablate multiple target materials, merging their material flows into a single coating process. This parallel processing approach maintains the precise composition control of individual laser ablation while significantly increasing the overall deposition rate and productivity
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 improves the energy density, durability, and safety of lithium-ion batteries by reducing lithium loss, stabilizing the SEI layer, and preventing dendrite growth, while also allowing for the use of high current densities and mechanical flexibility.
Implementation Method 1
a laser beam (12, 23, 41, 71a-d, 81a-d) is directed onto at least one target (13, 42a-b, 72a-b, 82a-d, 82A-D) and material is removed by ablation from the target as atoms, ions, particles or droplets or as combinations from this selection of species
Implementation Method 2
The material ejected from the target is directed to the surface of the object to be coated resulting in a coating with the desired properties and thickness
Data Source
AI summary
A method is for manufacturing materials for electrochemical energy storage devices. A deposition method based on laser ablation is utilised in the manufacturing of at least one material layer including lithium. The process is controlled using measurement information that is obtained from the spectrum of the electromagnetic radiation generated by laser ablation. A roll-to-roll method can be used in the deposition, in which the substrate (15, 32, 44, 64, 75, 85) to be coated is directed from one roll (31a) to the second roll (31 b), and the deposition takes place in the area between the rolls (31a-b). In addition, turning and/or moving mirrors (21) can be used to direct laser beam (12, 41, 71a-d, 81a-d) as a beam line array (23) to the surface of the target (13, 42a-b, 72a-d, 82a-d, 82A-D).