HATAQ Cathode Material for High-Rate Lithium-Ion Batteries
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Solution Overview
Problem
Conventional lithium-ion batteries have insufficient capacity at both low and high current densities, necessitating improvements in capacity and charge/discharge rate capability.
Innovation Solution
A cathode material comprising compounds with specific formulas that form intermolecular hydrogen bonds, allowing for a graphite-like layered structure, is developed, along with a fabrication method involving the use of specific compounds and processing steps to enhance the battery's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional cathode materials are used, then the battery structure is simple and easy to manufacture, but the capacity is insufficient at both low and high current densities
Solution Approach 1:
The patent employs composite materials by combining organic compounds with specific molecular structures that contain multiple redox-active sites. The cathode material uses a composite approach where molecules with multiple quinone/hydroquinone groups are integrated into a structured framework, enabling both high capacity and good rate capability through the synergistic effect of multiple electroactive units working together.
Solution Approach 2:
The cathode material is segmented into multiple independent redox-active sites within each molecule. Each quinone/hydroquinone group functions as an independent electrochemical unit that can undergo electron transfer reactions. This segmentation allows multiple capacity contributions from different sites, achieving high overall capacity while maintaining structural organization that facilitates ion transport.
2Productivity
If conventional cathode materials are used, then the manufacturing process is simple, but the charge/discharge rate capability is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure parameters of the cathode material - specifically incorporating multiple redox-active quinone groups per molecule and designing specific substituent patterns. These structural parameter changes enable faster electron transfer kinetics and better ionic conductivity, achieving improved charge/discharge rate capability while the fabrication process remains accessible through conventional organic synthesis methods.
3Reliability
If the cathode material forms a graphite-like layered structure through intermolecular hydrogen bonds, then the capacity retention after cycling is improved, but the structural complexity increases
Solution Approach 1:
The patent extracts and utilizes the hydrogen bonding capability from the molecular structure by incorporating specific functional groups (carboxylic acid, hydroxyl, or amine groups) that can form intermolecular hydrogen bonds. This extracted hydrogen bonding feature self-assembles the molecules into stable graphite-like layered structures, providing structural stability and improved capacity retention without requiring complex external stabilization mechanisms.
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 cathode material achieves a capacity of 515 mAh/g at 200 mA/g and 209 mAh/g at 10000 mA/g, maintaining 85% capacity after 1000 cycles, demonstrating improved charge and discharge rate capability.
Implementation Method 1
can form intermolecular hydrogen bonds (C—H . . . O bonds) to form a graphite-like layered structure
Data Source
AI summary
A cathode material of a lithium-ion battery and a fabricating method thereof, and a lithium-ion battery are described. The cathode material of the lithium-ion battery has hexaazatriphenylene embedded quinone (HATAQ) and/or its derivative small molecules, which have multiple redox-active sites and can form intermolecular hydrogen bonds to form a graphite-like layered structure. When HATAQ and/or its derivative small molecules are used as a cathode material, a stable structure can be maintained during a charge and discharge process and during lithium ions entering and exiting.