Solid-State Electrodes Using Non-Carbon Conductive Additives
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Solution Overview
Problem
The preparation of solid-state electrodes and electrolytes for lithium-ion batteries often requires high-temperature compaction and can be challenging due to the oxidation of carbon materials during manufacturing, limiting the use of carbon-containing components and affecting electronic conductivity and power density.
Innovation Solution
Incorporating non-carbon electronic conductive additives (NECA) such as tin oxide or titanium oxide into the anode and cathode materials, combined with oxide solid-state electrolytes, to enhance electronic and ionic conductivity, while avoiding the use of carbon-based materials, through methods like mixing, coating, or atomic layer deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon-based materials are used as electronic conductive additives, then electronic conductivity is improved, but oxidation occurs during high-temperature manufacturing
Solution Approach 1:
The patent changes the material parameter from carbon-based to non-carbon-based electronic conductive additives. Specifically, it uses metals (Al, Cu, Ag, Au), metal oxides (SnO2, TiO2, ZnO), metal sulfides (CoS2, MoS2), and metal carbides (SiC, B4C) as alternatives to carbon black or graphite, thereby maintaining electronic conductivity while avoiding oxidation issues during high-temperature sintering processes
Solution Approach 2:
The patent employs sacrificial organic binder materials (such as polyvinylidene difluoride dissolved in N-methyl-2-pyrrolidone) that are intentionally designed to be temporary and removable. These binders facilitate particle bonding during manufacturing but are completely removed during sintering, leaving no harmful residues and enabling high-temperature processing without carbon contamination
2Manufacturing precision
If high-temperature compaction is applied to form solid-state electrodes, then electrode density is improved, but carbon-containing components are oxidized
Solution Approach 1:
The patent extracts and removes carbon-containing components from the electrode composition entirely. By eliminating carbon-based electronic conductive additives and using only non-carbon alternatives, the harmful oxidation reactions are prevented while still achieving the desired electrode density through high-temperature sintering of the oxide-based composite materials
Solution Approach 2:
The patent employs composite materials consisting of active electrode material particles (cathode or anode), oxide solid-state electrolyte particles, and non-carbon electronic conductive additive particles. This composite structure enables high-temperature processing to achieve dense electrodes while the non-carbon composition prevents oxidation-related harm
3Reliability
If non-carbon electronic conductive additives are incorporated, then electronic conductivity is improved without oxidation, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into a single sintering step: the organic binder is decomposed and removed, the inorganic particles (electrode material, electrolyte, and conductive additive) are densified and bonded together, and the final electrode structure is formed all in one high-temperature treatment. This integration simplifies manufacturing despite using non-carbon additives
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
This approach improves the electronic conductivity and power performance of lithium-ion batteries by maintaining high temperature stability and electrochemical voltage potential without relying on carbon-containing components, thus overcoming the limitations of existing technologies.
Implementation Method 1
The NECA additive is selected to provide a suitable improvement in the electronic conductivity of a proportioned mixture of ion-conducting anode or cathode particles and oxide solid-state electrolyte particles
Implementation Method 2
The oxide solid electrolyte particles enhance ionic conductivity in and through the cathode material particles
Implementation Method 3
the carbon-based binder solution (e.g., polyvinylidene difluoride dissolved in N-methyl-2-pyrrolidone) is vaporized, decomposed, and removed from the densified electrode body
Data Source
AI summary
Individual electrodes for a solid-state lithium-ion battery cell may be formed, for example, by elevated temperature consolidation in air of a mixture of resin-bonded, electrode active material particles, oxide solid electrolyte particles, and particles of a non-carbon electronic conductive additive. Depending on the selected compositions of the electrode materials and the solid electrolyte, one or both of the cathode and anode layer members may be formed to include the non-carbon electronic conductive additive. The battery cell is assembled with the solid-state electrodes placed on opposite sides of a consolidated layer of oxide electrolyte particles. The electronic conductivity of at least one of the cathode and anode is increased by the incorporation of particles of a selected non-carbon electronic conducive additive with the respective electrode particles.