Lithium Microbattery Electrolyte Photolithography
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Solution Overview
Problem
Current methods for producing lithium microbatteries are costly, incompatible with microelectronics technologies, and prone to particle contamination and edge effects due to the use of masking techniques, which are not suitable for small dimensions and are sensitive to air and humidity, making industrialization difficult.
Innovation Solution
The method involves a double masking technique using chemically inert materials for photolithography and plasma etching to form the electrolyte and anode, ensuring protection against environmental damage and allowing for the use of microelectronics technologies, including photolithography and plasma etching, without exposing lithiated compounds to harmful conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If masking technique is used for deposition, then current collectors and cathode can be formed, but particle contamination and scratches occur on the layers
Solution Approach 1:
The patent removes the mask from the deposition process entirely. Instead of using physical masks to define patterns, the invention forms continuous layers and then uses photolithography and etching to create the desired structures. This extraction of the mask eliminates the source of particle contamination and mechanical scratches that plagued traditional deposition methods.
Solution Approach 2:
The patent replaces the mechanical masking system with a photolithographic system. Instead of physically blocking deposition with masks, the invention uses light-sensitive photoresist materials that are patterned through photolithography. This substitution eliminates mechanical contact between masks and delicate layers, preventing scratches and contamination while maintaining precise pattern definition.
2Length of moving object
If masking technique is used for small dimensions, then microbattery components can be formed, but edge effects become detrimental
Solution Approach 1:
The patent replaces mechanical masks with photolithographic patterning, which uses optical methods to define features. This substitution eliminates edge effects associated with physical masks, as photolithography can achieve finer feature sizes with better edge definition through controlled light exposure and chemical development processes, rather than relying on mechanical mask edges.
Solution Approach 2:
The patent changes the fundamental parameter of pattern definition from mechanical (mask physical edges) to optical-chemical (photoresist exposure and development). This parameter change enables superior precision at small dimensions by controlling feature size through optical wavelength, exposure dose, and chemical development parameters rather than mechanical mask tolerances.
3Ease of manufacture
If deposition through mask is used, then microbattery can be produced, but production is expensive and incompatible with microelectronics technologies
Solution Approach 1:
The patent adopts photolithography and etching techniques that are universally used in microelectronics manufacturing. By using the same fabrication tools and processes as the microelectronics industry, the invention enables microbattery production to be integrated with existing semiconductor manufacturing lines, reducing overall system complexity and enabling economies of scale.
Solution Approach 2:
The patent changes the production methodology from specialized vacuum deposition with masks to standard photolithographic processing. This parameter change in the manufacturing approach aligns the process with conventional microelectronics fabrication, reducing equipment complexity and enabling the use of mature, cost-effective manufacturing infrastructure.
4Ease of operation
If microbattery is placed in air between deposition steps, then production can be simplified, but water and air damage the lithiated compounds
Solution Approach 1:
The patent replaces the mechanical constraint of continuous vacuum environment with a chemical protection system. By using photolithography with photoresist materials and performing etching in controlled atmospheres, the process allows temporary exposure to air while protecting sensitive lithiated compounds through chemical means rather than requiring continuous vacuum isolation.
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 enables the production of lithium microbatteries that are cost-effective, compatible with microelectronics, reduces particle contamination, and allows for the integration of microbatteries on microcomponents like integrated circuits, improving reproducibility and reducing the risk of damage during production.
Implementation Method 1
deposition of an electrolytic thin layer on the substrate provided with the current collectors and with the cathode
Implementation Method 2
deposition, on the electrolytic thin layer, of a first protective thin layer that is chemically inert with regard to lithium
Implementation Method 3
fabrication of a mask by photolithography on the first masking thin layer
Implementation Method 4
selective etching of the first masking thin layer then removal of the mask, selective etching of the first protective thin layer and of the electrolytic thin layer
Data Source
AI summary
During the production of a lithium microbattery, the electrolyte containing a lithiated compound is formed by successively depositing an electrolytic thin film, a first protective thin film that is chemically inert in relation to the lithium, and a first masking thin film on a substrate provided with current collectors and a cathode. A photolithography step is carried out on the first masking thin film in order to create a mask for selectively etching the first masking thin layer, and the first protective thin layer and the electrolytic thin film are then selectively etched in such a way as to form the electrolyte in the electrolytic thin film. This technique enables the electrolyte to be formed by photolithography and etching without causing any damage thereto.