- Fluorine free adhesive
Project Background
1.PFAS definition:(per-& polyfluoroalkyl substances) series of non-natural compounds. H in some C- H bonds that may exist on the molecular carbon chain skeleton is replaced by F to form fluorinated hydrophobic chains, including PVDF, PTFE, etc.
2.PFAS hazards: potential endocrine disruptors associated with a variety of adverse outcomes, including reproductive and developmental toxicity, may affect the functional persistence of reproductive hormones, and are hardly biodegradable
3.PFAS Act: In 2021, the United States requires PFAS not to be detected for packaging materials.
Article 68 of Annex 17 of the EU REACH Regulation restricts the C9-C14 of PFCA
3M plans to stop using PFAS in its product portfolio by the end of 2025
No fluorine adhesive HJ815
The molecular structure of fluorine-free adhesive HJ815 is a propylene copolymer, which is non-toxic and degradable, avoiding the PFAS Act. High electrochemical stability and protection of active materials, improve lithium battery manufacturability (no drying room), cycle and safety performance.
HJ815 can be used as a comprehensive replacement of PVDF cathode binder.
HJ815 Product Advantage
Improve circulation & safety:
Main material & electrolyte side reaction ↓
Electronic Conductivity & Network Stability ↑
better dynamics
manufacturability:
No chemical gels & no environmental requirements
Suspension performance of PVDF 2~3 times
More efficient dissolution vs PVDF
Bio & Environmentally Friendly:
No biological toxicity
Degradable, environmentally friendly
Not affected by the PFAS Act
HJ815 battery application advantages:
(1) No chemical gel, no drying room environment production, reduce manufacturing costs
(2) Compared with PVDF, it can be reduced by 30% and the solid content of slurry is improved.
(3) The processing performance (pole piece bonding force and diaphragm resistance) has no significant difference with PVDF
(4) The first effect, K value and rate discharge of the battery are the same as those of PVDF, and DCR is lower.
(5) improve the cycle & safety performance: protect the main material, reduce side reactions; high cohesion, improve the stability of the conductive path structure
Product Parameters
| N0 | Test Item | Test Method | PVDF(5130) | HJ815 | Remarks |
| 1 | Molecular Weight (Mw) | GPC | ~70W | ~40W | |
| 2 | Melting point (℃) | TG | 160~172 | 158 | |
| 3 | Decomposition temperature (℃) | TG | 460~480 | 268 | |
| 4 | crystallinity | DSC | 40%~45% | 35% | |
| 5 | CV stability | Buckle power (negative lithium chip) | ≤ 4.70V | ≤ 4.95V | Conductive carbon adhesive into pole piece |
| 6 | 60 ℃ & 7Day electrolyte swelling | Customer Requirements | 30% | 10% | Adhesive film control thickness 100μm |
| 7 | Granularity Dv50(μm) | laser particle size analyzer | 75 | 6 | |
| 8 | Dissolution time (min) | 7% solid content stirring | 80 | 30 | Single Rod Disperser, 800rpm |
| 9 | Appearance of 7% glue solution | Visual | Light yellow transparent liquid | Light yellow transparent liquid | |
| 10 | 7% glue viscosity (CP) | viscometer | 4500 | 280 | |
| 11 | Zero shear viscosity of slurry (P) | rotational rheometer | 23 | 85 | |
| 12 | Formulation Recommended Dosage | / | 1.3%~1.6% | 0.7%~1.1% | |
| 13 | Applicable main material type | / | NCM | LCO/NCM/LMO/Sodium Electricity | LFP easy physical gel, viscosity should be less than or equal to 6000cp |
Keywords: SBR CMC flexible agent cracking agent coated carbon aluminum foil adhesive graphene
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