Lignin-Derived Hard Carbon Anodes With Tunable Morphology
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Solution Overview
Problem
Existing hard carbon materials lack morphology tunability and are costly, limiting their effectiveness as anode materials in batteries.
Innovation Solution
A method involving liquification of lignin in glycerol or glycerol/ethylene glycol with an acid catalyst, followed by addition of a crosslinking reagent for controlled polymerization, and pyrolysis to form hard carbon with controlled morphology, using biowaste feedstocks like lignin and crude glycerol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional hard carbon is produced by heating carbonaceous precursors, then hard carbon can be obtained, but morphology tunability is not achieved
Solution Approach 1:
The patent applies preliminary action by forming a thermoset polymer with controlled morphology before pyrolysis. The thermoset polymer is synthesized with specific spherical or flake shapes through controlled polymerization conditions, and this pre-formed morphology is preserved during the subsequent pyrolysis step to produce hard carbon with the desired shape. This allows morphology control to be established in advance rather than attempting to control it during the final carbonization step.
Solution Approach 2:
The patent utilizes parameter changes by controlling the polymerization process parameters (such as monomer ratios, catalyst concentration, temperature, and pressure) to produce thermoset polymers with different morphologies. By adjusting these parameters during polymer synthesis, the hard carbon obtained after pyrolysis can be tailored to have specific shapes and size distributions, enabling morphology tunability through systematic parameter optimization.
2Reliability
If conventional hard carbon is produced, then production cost is reduced, but performance characteristics such as reversible capacity and cycling stability are limited
Solution Approach 1:
The patent employs composite materials by combining lignin-derived thermoset polymer with specific morphological characteristics and controlling its composition during polymerization. The resulting hard carbon exhibits enhanced performance characteristics including improved reversible capacity and cycling stability, while maintaining cost-effectiveness through the use of lignin as a renewable, low-cost feedstock. The composite approach allows optimization of both performance and cost.
Solution Approach 2:
The patent applies parameter changes by optimizing pyrolysis conditions (temperature, atmosphere, heating rate) and polymerization parameters to produce hard carbon with superior performance characteristics. By carefully controlling these parameters, the material achieves enhanced electrochemical performance while maintaining cost-effectiveness through efficient use of lignin feedstock and energy.
3Manufacturing precision
If lignin is liquified in glycerol/ethylene glycol with acid catalyst, then controlled polymerization can occur, but process complexity increases
Solution Approach 1:
The patent uses an intermediary approach by employing glycerol or ethylene glycol as both solvent and reaction medium, and using acid catalysts (such as sulfuric acid, phosphoric acid, or hydrochloric acid) as mediators to facilitate controlled polymerization. These intermediaries enable precise control over polymer formation while managing the complexity of the liquidification and polymerization processes in a single integrated system.
Solution Approach 2:
The patent applies universality by using glycerol or ethylene glycol for multiple functions: as solvent, as reaction medium, and as part of the polymerization system. The acid catalysts serve multiple roles including initiating polymerization, controlling molecular weight, and managing reaction conditions. This multi-functionality reduces the need for separate components and simplifies the overall process despite the increased chemical complexity.
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
Enables lower-cost production of hard carbon anodes with tunable morphology, enhancing performance characteristics such as reversible capacity and cycling stability.
Implementation Method 1
liquifying lignin in at least one of glycerol or glycerol/ethylene glycol with an acid catalyst to form a first monomer of liquified lignin
Implementation Method 2
providing a second monomer including a crosslinking reagent to the first monomer of liquified lignin to facilitate controlled polymerization resulting in a resin having controlled size and morphology
Implementation Method 3
pyrolyzing the resin to form the hard carbon with a controlled morphology
Data Source
AI summary
A method for forming hard carbon, a hard carbon, and a hard carbon anode is provided. The method includes liquifying lignin in at least one of glycerol or glycerol/ethylene glycol with an acid catalyst to form a first monomer of liquified lignin. The method includes providing a second monomer including a crosslinking reagent to the first monomer of liquified lignin to facilitate controlled polymerization resulting in a resin having controlled size and morphology, Additionally, the method includes pyrolyzing the resin to form the hard carbon with a controlled morphology. The first monomer and the second monomer are provided in a ratio of 10 wt. % to 90 wt. %.