Vanadium-Based Microbattery for Low-Voltage Wearables
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Solution Overview
Problem
Traditional lithium-ion batteries are inefficient for low-voltage applications in small electronic devices like wearables and IoT devices, as they require high voltages and contain toxic heavy metals like cobalt, making them redundant and hazardous for use in these applications.
Innovation Solution
The development of low-voltage rechargeable microbatteries with a vanadium-based cathode and a solid electrolyte, replacing lithium cobalt oxide with vanadium oxide to reduce voltage requirements and eliminate toxic cobalt, featuring a method of fabrication that includes forming a vanadium-containing cathode, a solid electrolyte, and an anode on a substrate with conductive contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional lithium-ion batteries with lithium cobalt oxide cathode are used, then high voltage output is achieved, but the battery becomes unsuitable for low-voltage applications and contains toxic heavy metals
Solution Approach 1:
The patent changes the chemical composition parameters of the cathode material from lithium cobalt oxide to vanadium oxide, which fundamentally alters the voltage characteristics and eliminates toxic cobalt. This parameter change enables the battery to operate at low voltages (0.5-1.0V) while being non-toxic, directly resolving the contradiction between toxicity and voltage output.
Solution Approach 2:
The patent employs vanadium oxide as a replacement for expensive and toxic lithium cobalt oxide. Vanadium is more abundant and less toxic, making the battery safer for wearable applications even if the battery has shorter lifespan. This substitution resolves the toxicity issue while maintaining functional adequacy for low-voltage devices.
2Use of energy by moving object
If traditional lithium-ion batteries are used for small electronic devices, then high energy density is achieved, but the battery size and complexity become unsuitable for miniaturized devices
Solution Approach 1:
The patent segments the battery into ultra-thin film layers (cathode, solid electrolyte, anode) deposited on a flexible substrate. This segmentation into thin films reduces the overall battery thickness and complexity while maintaining energy storage capability, making it suitable for wearable and IoT devices with strict size constraints.
Solution Approach 2:
The patent uses flexible thin film structures for all battery components, particularly the solid electrolyte and electrode layers. This thin film approach dramatically reduces battery thickness and structural complexity compared to traditional rigid lithium-ion battery structures, enabling integration into miniaturized electronic devices while maintaining adequate energy density.
3Power
If traditional lithium-ion batteries are used, then high voltage operation is achieved, but the battery becomes inefficient for recharging with photovoltaic devices and other low-voltage energy sources
Solution Approach 1:
The patent changes the operating voltage parameter from traditional high voltage (3.7V) to low voltage (0.5-1.0V) by using vanadium oxide cathode. This parameter change enables direct matching with photovoltaic cell output voltages and other low-voltage energy harvesting sources, eliminating the need for complex voltage regulation circuits and improving overall recharging efficiency for wearable and IoT applications.
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 vanadium-based microbatteries operate effectively at low voltages, are safer due to the absence of toxic cobalt, and demonstrate excellent cycling performance, enabling efficient power supply for miniaturized electronic devices with reduced dimensions and improved scalability.
Implementation Method 1
forming a solid electrolyte on the cathode
Data Source
AI summary
Low-voltage rechargeable microbatteries having a vanadium-based cathode are provided. In one aspect, a method of forming a battery is provided. The method includes the steps of: forming a first contact on a substrate; forming a cathode on the first contact, wherein the cathode is formed from a vanadium-containing material; forming a solid electrolyte on the cathode; forming an anode on the solid electrolyte; and forming a second contact on the anode. A battery having a vanadium-based cathode is also provided.