Silicon Secondary Battery with Stacked Thin Film Electrodes
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Solution Overview
Problem
Lithium secondary batteries are expensive and pose environmental pollution issues due to lithium discharge during disposal, necessitating a high-power replacement with improved performance characteristics.
Innovation Solution
A silicon secondary battery design featuring stacked silicon positive and negative electrode thin film layers with a solid electrolyte layer, incorporating silicon compounds and conductive polymers like PVDF and PTFE, and including mesh plates in active materials to enhance electron mobility and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium secondary batteries are used, then high energy density and portability are achieved, but manufacturing cost increases and environmental pollution occurs during disposal
Solution Approach 1:
The patent replaces expensive lithium with silicon, which is cheaper and environmentally friendly. The silicon secondary battery uses silicon-based electrodes that can be disposed of without causing severe environmental pollution, while maintaining comparable energy density through optimized electrode structures and solid electrolytes.
Solution Approach 2:
The patent changes the chemical composition parameters from lithium-based to silicon-based materials. By adjusting the silicon compound ratios, electrode thicknesses, and solid electrolyte compositions, the battery achieves high energy density without the environmental harm associated with lithium disposal.
2Quantity of substance
If electrode active material density is increased by stacking and pressing, then current density and capacity increase, but manufacturing complexity increases
Solution Approach 1:
The patent divides the electrode into multiple thin film layers (positive electrode thin film layers and negative electrode thin film layers) that are stacked sequentially. Each layer is relatively simple to manufacture, but their combination achieves high current density and capacity through the cumulative effect of multiple layers working together.
Solution Approach 2:
The patent transitions from a single-layer electrode structure to a multi-layer stacked structure, adding the vertical dimension of layering. This allows current density to increase through the cumulative active material volume of multiple layers, while each individual layer remains simple to manufacture using standard thin film deposition techniques.
3Speed
If mesh plates are included in active materials, then electron mobility improves, but device complexity increases
Solution Approach 1:
The patent incorporates mesh plates locally within the electrode active material layers rather than as separate structural components. The mesh plates create conductive pathways specifically where needed for electron transport, improving electron mobility in critical regions without adding overall device complexity.
4Length of moving object
If battery thickness is reduced by sharing electrodes for serial connection, then output voltage increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges electrode functions by using shared electrodes for serial connections between multiple battery cells. Instead of having separate electrodes for each cell, the same electrode serves multiple functions, reducing overall battery thickness while achieving higher output voltage through the series configuration enabled by the shared electrode structure.
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 silicon secondary battery reduces manufacturing costs, minimizes environmental pollution, increases current density and capacity, and allows for thinner, higher output voltage designs, suitable for backup power applications integrated with printed circuit boards or chips.
Implementation Method 1
a solid electrolyte layer located between the first silicon multilayer thin film part and the second silicon multilayer thin film part and configured to deliver silicon ions between the first silicon multilayer thin film part and the second silicon multilayer thin film part when the silicon secondary battery is charged and discharged
Implementation Method 2
a plurality of silicon positive electrode thin film layers each formed of a first silicon compound, which generates silicon cations when the silicon secondary battery is charged and generates silicon anions when the silicon secondary battery is discharged
Implementation Method 3
a plurality of silicon negative electrode thin film layers each formed of a second silicon compound, which generates silicon anions when the silicon secondary battery is charged and generates silicon cations when the silicon secondary battery is discharged
Data Source
AI summary
A silicon secondary battery, by substitutions of silicon for lithium, enables decreasing of preparations cost and minimizing of environmental pollutions. By laminate pressing multiple times a positive or negative electrode material, the present invention enables increasing of the density of a positive or negative electrode active material, thereby increasing current density and capacity. By having mesh plates equipped inside the positive electrode active material and the negative electrode active material, the present invention enables effective moving of electrons. By enabling common use of an electrode, of a silicon secondary battery, connected during a serial connections of the silicon secondary battery, the present invention enables decreasing of the thickness of a silicon secondary battery assembly and increasing of output voltage. By being integrally formed with a PCB or a chip and supplying a power source, the present invention plays the role of a backup power source for instant discharging.