Conformal Polymer Electrolyte on Nanostructured Anodes
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Solution Overview
Problem
Current lithium ion batteries suffer from slow lithium ion kinetics due to slow diffusivity, large separator thickness, and slow electron transport, which limits their charge/discharge rates and energy densities, and achieving uniform coatings of separator/electrolyte units around nanostructured electrode materials is challenging.
Innovation Solution
A method involving template-assisted electrodepositing of nanowires, followed by pore widening and infiltration of a polymer solution to create a conformal polymer electrolyte layer around individual anode nanowires, forming an anode-polymer electrolyte core-shell assembly that enhances lithium ion diffusion and energy storage capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional planar battery design is used, then manufacturing is simpler, but lithium ion diffusion distance is long and charge/discharge rate is slow
Solution Approach 1:
The patent transitions from conventional planar (2D) battery architecture to a three-dimensional (3D) nanostructured architecture where electrode materials are organized in vertical columns with polymer electrolyte infiltrated throughout the porous structure. This dimensional change enables simultaneous short diffusion paths and high energy density by utilizing the third dimension for ion transport while maintaining compact footprint.
Solution Approach 2:
The battery is segmented into discrete functional components: nanostructured electrode materials with specific pore structures, polymer electrolyte that infiltrates the porous network, and current collectors. This segmentation allows each component to be optimized independently - the electrode provides short diffusion paths, the polymer electrolyte enables fast ion transport through the porous structure, and the current collectors maintain electrical connectivity.
2Speed
If separator thickness is reduced to improve charge/discharge rate, then ion transport is faster, but mechanical strength and safety are compromised
Solution Approach 1:
The patent employs thin polymer electrolyte films that infiltrate the porous electrode structure, providing both separation functionality and mechanical integrity. The polymer electrolyte forms a flexible yet strength-providing matrix that maintains structural stability while enabling fast ion transport through its molecular structure, eliminating the need for thick rigid ceramic separators.
Solution Approach 2:
The electrode materials are designed with controlled porous structures that allow polymer electrolyte infiltration. The porous architecture provides high surface area for electrochemical reactions while the interconnected pores serve as ion transport channels, enabling fast lithium ion diffusion without requiring thick separators. The porosity is optimized to balance ion transport efficiency with mechanical stability.
3Speed
If nanostructured electrode materials are used to shorten diffusion paths, then charge/discharge rate improves, but achieving uniform polymer electrolyte coating is challenging
Solution Approach 1:
The electrode materials are pre-synthesized with optimized porous structures before polymer electrolyte infiltration. The porous architecture is prepared in advance with controlled pore size, shape, and distribution to facilitate uniform polymer electrolyte impregnation. This preliminary structuring ensures that when the polymer electrolyte is introduced, it uniformly fills the porous network without aggregation or voids, achieving consistent coating thickness.
Solution Approach 2:
The polymer electrolyte acts as an intermediary that infiltrates the porous electrode structure, bridging the gap between the solid electrode material and the liquid electrolyte environment. This intermediary approach allows the polymer to conformally coat the complex nanostructured surfaces, providing uniform coverage even on high-surface-area 3D structures that would be difficult to coat with conventional methods.
4Quantity of substance
If 3D nanostructured architecture is implemented, then energy density and charge/discharge rate improve, but manufacturing complexity increases
Solution Approach 1:
The polymer electrolyte serves multiple functions simultaneously: it acts as the ion-conducting medium, provides mechanical support and structural stability, enables separation between electrodes, and facilitates uniform infiltration of the porous electrode structure. This multi-functionality reduces the need for separate components and complex assembly steps, simplifying manufacturing despite the 3D architecture.
Solution Approach 2:
The patent merges the separator and electrolyte functions into a single polymer electrolyte component that infiltrates the porous electrode structure. This consolidation eliminates the need for separate separator layers and liquid electrolyte filling steps, reducing manufacturing complexity. The polymer electrolyte simultaneously provides ion transport, mechanical support, and electrode separation in one integrated component.
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 conformal polymer electrolyte layer significantly improves lithium ion kinetics and energy storage capacities by reducing lithium ion diffusion distances and maintaining high energy densities, with two orders of magnitude improvement in reversible discharge capacities compared to planar designs.
Implementation Method 1
The conformal polymer electrolyte layer significantly improves lithium ion kinetics and energy storage capacities by reducing lithium ion diffusion distances
Implementation Method 2
A method involving template-assisted electrodepositing of nanowires
Data Source
AI summary
A fabrication process for conformal coating of a thin polymer electrolyte layer on nanostructured electrode materials for three-dimensional micro/nanobattery applications, compositions thereof, and devices incorporating such compositions. In embodiments, conformal coatings (such as uniform thickness of around 20-30 nanometer) of polymer Polymethylmethacralate (PMMA) electrolyte layers around individual Ni—Sn nanowires were used as anodes for Li ion battery. This configuration showed high discharge capacity and excellent capacity retention even at high rates over extended cycling, allowing for scalable increase in areal capacity with electrode thickness. Such conformal nanoscale anode-electrolyte architectures were shown to be efficient Li-ion battery system.