Layered Double Hydroxide Electrodes for High Energy Density
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Solution Overview
Problem
Existing energy storage devices, such as batteries and capacitors, face limitations in energy density, power density, life cycles, and recharge times, which restrict the design and utility of portable electronic devices.
Innovation Solution
A novel energy storage device comprising a first electrode with a layered double hydroxide, a conductive scaffold, and a first current collector, and a second electrode with a hydroxide and a second current collector, along with a separator and an electrolyte, enabling high energy density through redox reactions and ion adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional batteries and capacitors are used, then device portability is maintained, but energy density and power density are limited
Solution Approach 1:
The patent employs composite electrode structures combining layered double hydroxides with conductive scaffolds (carbon-based materials). This composite approach enables simultaneous achievement of high energy density through redox-active LDH materials and high power density through conductive carbon networks, resolving the contradiction between energy storage capacity and device mass.
Solution Approach 2:
The invention utilizes porous conductive scaffolds with high surface area-to-volume ratios. These porous structures provide extensive active sites for ion adsorption and redox reactions while maintaining low mass, thereby increasing energy density without proportionally increasing battery mass.
2Duration of action of stationary object
If conventional batteries are used, then basic energy storage is provided, but recharge time and life cycle are limited
Solution Approach 1:
The electrode structures are pre-designed with optimized porous architectures and conductive networks that facilitate rapid ion transport pathways. This preliminary structural optimization enables fast charging by reducing ion diffusion distances and eliminating transport bottlenecks before charging begins, thereby decreasing recharge time while maintaining structural integrity for extended life cycles.
Solution Approach 2:
The patent employs dynamic electrode designs where the conductive scaffold and layered double hydroxide composite structures adapt to ion insertion/extraction processes. The porous structures expand and contract dynamically during charging/discharging cycles, accommodating volume changes and preventing structural degradation, thus extending life cycle while maintaining fast charge capability.
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 device achieves significantly enhanced energy and power densities, improving the performance and functionality of portable electronic devices by optimizing electrode materials and configurations.
Implementation Method 1
enabling high energy density through redox reactions and ion adsorption
Implementation Method 2
enabling high energy density through redox reactions and ion adsorption
Data Source
AI summary
Provided herein are energy storage devices comprising a first electrode comprising a layered double hydroxide, a conductive scaffold, and a first current collector; a second electrode comprising a hydroxide and a second current collector; a separator; and an electrolyte. In some embodiments, the specific combination of device chemistry, active materials, and electrolytes described herein form storage devices that operate at high voltage and exhibit the capacity of a battery and the power performance of supercapacitors in one device.