Non-graphitic Carbon Additives for Li-Ion Battery Cathodes
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Solution Overview
Problem
Current lithium ion batteries face limitations in specific power due to low electrical conductivity of typical cathode active materials, necessitating conductive additives like carbon black, which have drawbacks such as agglomeration and complex production processes, and high metallic impurity content, requiring new, high-purity, easy-to-produce alternatives.
Innovation Solution
A cathode material for lithium ion batteries comprising a non-graphitic carbon additive obtained by pyrolyzing and carbonizing precursor materials like resol type resins, novolac type resins, cellulose, tannic acid, lignin, or polyaniline, with specific properties such as modal pore size, particle diameter, and size distribution, combined with carbon black or carbon nanotubes, to enhance conductivity and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon black is used as conductive additive, then electrical conductivity is improved, but agglomeration and rheological problems occur
Solution Approach 1:
The patent uses bio-based precursors (lignin, cellulose, tannic acid) that are inexpensive, readily available, and can be processed into conductive carbon additives without requiring expensive purification steps. These materials serve as disposable precursors that are converted into functional carbon additives through simple pyrolysis, replacing expensive and problematic carbon black.
Solution Approach 2:
The patent changes the fundamental parameters of conductive additives by using bio-based carbon materials with different physical and chemical properties compared to carbon black. The bio-based carbons have different particle morphology, surface chemistry, and agglomeration behavior, which fundamentally alters the rheological properties of the slurry and eliminates agglomeration problems.
2Productivity
If standard carbon black production is used, then conductive additives are available, but metallic impurities and complex production processes occur
Solution Approach 1:
The patent extracts and eliminates the harmful metallic impurity component from the conductive additive production process by completely replacing oil/gas-based carbon black production with bio-based precursor pyrolysis. This extraction of the problematic element (metallic contaminants) is achieved by substituting the entire production pathway with a inherently cleaner alternative.
Solution Approach 2:
The bio-based precursors (lignin, cellulose, tannic acid) are naturally occurring materials that inherently lack metallic impurities. The materials self-purify through the pyrolysis process, producing high-purity carbon additives without requiring additional purification steps or quality control measures for metallic contaminants.
3Reliability
If carbon black is used as conductive additive, then conductivity is enhanced, but production complexity and cost increase
Solution Approach 1:
The patent employs inexpensive bio-based materials (lignin from paper industry waste, cellulose from plant sources, tannic acid from natural sources) as disposable precursors. These materials are converted into conductive carbon additives through a single pyrolysis step, eliminating the need for complex multi-step production processes required for conventional carbon black.
Solution Approach 2:
The patent replaces the complex mechanical and chemical processing required for carbon black production with a simple thermal pyrolysis process. The bio-based precursors are directly converted into conductive carbon additives through heating in the absence of oxygen, substituting complex production machinery and processes with a straightforward thermal treatment.
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 use of non-graphitic carbon additives improves the conductivity and purity of cathode materials, enabling higher specific power and longer battery lifetimes while simplifying production and reducing metallic impurities, thus meeting the demands for high-performance lithium ion batteries.
Implementation Method 1
the non-graphitic carbon material is obtainable by pyrolyzing and carbonizing a precursor material
Implementation Method 2
the non-graphitic carbon material is obtainable by pyrolyzing and carbonizing a precursor material
Data Source
Figure 1
AI summary
The invention relates to cathode material for a lithium ion battery comprising an active material, a binder and at least one conductive carbon additive comprising a non-graphitic carbon material, wherein the non-graphitic carbon material is obtainable by pyrolyzing and carbonizing a precursor material comprising a component A selected from the group consisting of resol type resins, novolac type resins, cellulose, tannic acid, lignin and polyaniline.