Hollow Carbonaceous Structure for Stable High-Rate Electrodes
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Solution Overview
Problem
Current energy storage devices, such as lithium-ion batteries and supercapacitors, face challenges in achieving high energy and power densities simultaneously due to kinetic imbalances and poor capacity retention caused by volume changes in electrode materials like Sn metal during alloying reactions, leading to short cycle life and poor rate capability.
Innovation Solution
A carbonaceous structure with hollow internal compartments and open porous channels is developed, allowing for the encapsulation of nanoparticles and accommodating volume changes, which enhances ion accessibility and active sites, thereby improving charge/discharge capacity and cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Sn metal is used as electrode material for high energy density, then energy density is improved, but volume change during alloying reactions causes poor capacity retention and short cycle life
Solution Approach 1:
Sn metal nanoparticles are encapsulated inside hollow internal compartments of the carbonaceous structure, creating a nested configuration where the active material is protected within a stable host structure that accommodates volume changes
2Ease of manufacture
If conventional electrode materials are used, then manufacturing simplicity is maintained, but kinetic imbalances limit power density and charge/discharge rate
Solution Approach 1:
The carbonaceous structure incorporates open porous channels that facilitate rapid ion transport throughout the electrode, enabling high power density while maintaining a manufacturable structure through conventional carbonization processes
3Quantity of substance
If electrode material with high capacity is used, then energy storage capacity is improved, but volume changes cause structural strain and agglomeration leading to poor cycle life
Solution Approach 1:
The hollow internal compartments are designed with sufficient volume capacity beforehand to accommodate the expansion and contraction of encapsulated nanoparticles during charge/discharge cycles, preventing structural strain and maintaining stability
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 carbonaceous structure achieves high energy density, power density, and long cycle life by suppressing agglomeration and strain, enabling rapid charging and stable performance in energy storage devices.
Implementation Method 1
one or more hollow internal compartments, each of which is connected to outside and to the one or more hollow internal compartments adjacent thereto through one or more open porous channels
Data Source
Figure 1ai~1e
Figure 2a~2c
Figure 3a~3f
AI summary
The present invention relates to a carbonaceous structure, a method for manufacturing the same, an electrode material comprising the carbonaceous structure, a catalyst comprising the carbonaceous structure, and an energy storing device comprising the electrode material.