INDUSTRY COMPONENT

SEI-forming additive

SEI-forming additive is a chemical component in lithium-ion battery electrolytes that promotes stable solid-electrolyte interphase layer formation on anode surfaces.

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Component Specifications

Definition
SEI-forming additive is a specialized chemical compound incorporated into lithium-ion battery electrolytes to facilitate the controlled formation of a stable solid-electrolyte interphase (SEI) layer on graphite or silicon-based anode surfaces during initial battery cycling. This additive decomposes preferentially at the anode-electrolyte interface, creating a protective film that prevents further electrolyte decomposition while allowing lithium-ion transport.
Working Principle
The additive molecules undergo electrochemical reduction at the anode surface during initial charging cycles, forming a stable, ion-conductive but electron-insulating layer that passivates the anode. This prevents continuous electrolyte decomposition, reduces irreversible capacity loss, and enhances battery safety and longevity.
Materials
Organic compounds including vinylene carbonate (VC), fluoroethylene carbonate (FEC), ethylene sulfite (ES), lithium difluoro(oxalato)borate (LiDFOB), and proprietary organosilicon or organophosphorus compounds.
Technical Parameters
  • Purity ≥99.5%
  • Density 1.2-1.5 g/cm³
  • Moisture Content ≤20 ppm
  • Decomposition Voltage 0.8-1.2 V vs. Li/Li⁺
  • Recommended Concentration 0.5-5.0 wt% in electrolyte
Standards
ISO 12405-4, IEC 62660-2, UL 1642, GB/T 18287

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for SEI-forming additive.

SEI-forming additive lithium-ion battery electrolyte anode protection battery additives vinylene carbonate fluoroethylene carbonate solid-electrolyte interphase SEI-forming additive in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Lithium-Ion Battery Electrolyte Additive Package

Chemical additive blend for enhancing lithium-ion battery electrolyte performance and safety.

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Engineering Analysis

Risks & Mitigation
  • Electrolyte decomposition if additive concentration is incorrect
  • Gas generation during formation
  • Reduced ionic conductivity if SEI layer is too thick
  • Compatibility issues with specific cathode materials
FMEA Triads
Trigger: Insufficient additive concentration
Failure: Unstable SEI formation leading to continuous electrolyte decomposition
Mitigation: Optimize concentration through electrochemical testing and implement precise dosing systems
Trigger: Moisture contamination in additive
Failure: Hydrogen fluoride generation and battery performance degradation
Mitigation: Maintain moisture levels below 20 ppm through dry room handling and sealed packaging
Trigger: Incompatibility with specific electrolyte solvents
Failure: Poor SEI formation or excessive gas generation
Mitigation: Conduct compatibility testing with full electrolyte formulation before implementation

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1% concentration in final electrolyte formulation
Test Method
Electrochemical impedance spectroscopy (EIS), cyclic voltammetry, gas chromatography-mass spectrometry (GC-MS) for decomposition analysis

Buyer Feedback

★★★★☆ 4.5 / 5.0 (34 reviews)

"The SEI-forming additive we sourced perfectly fits our Computer, Electronic and Optical Product Manufacturing production line requirements."

"Found 10+ suppliers for SEI-forming additive on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this SEI-forming additive is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

What is the primary function of SEI-forming additives?

To create a stable protective layer on anode surfaces that prevents continuous electrolyte decomposition while allowing lithium-ion transport.

Which materials are commonly used as SEI-forming additives?

Vinylene carbonate (VC), fluoroethylene carbonate (FEC), ethylene sulfite (ES), and various borate-based compounds are most common.

How do SEI-forming additives affect battery performance?

They improve cycle life, reduce irreversible capacity loss, enhance thermal stability, and prevent gas generation during operation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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