Daikin has developed to market innovative solutions to improve life cycle, safe, and high efficiency of lithium primary battery and lithium-ion battery.
The fluoromaterials are used in lithium-ion batteries, and high-performance materials are increasingly required to meet the needs for high capacity, safety, and long life. Daikin has developed various fluoromaterials for lithium-ion batteries. We are also focusing on the development of next-generation batteries, contributing to next-generation lithium-ion batteries and all-solid-state batteries.
SOLUTIONS & FEATURES
|1. Gasket materials||NEOFLON PFA||
|2. Cathode binder||
|3. Cathode binder with SWCNT||
|4. Cathode binder for dry process||POLYFLON BDP||
|5. Electrolyte additives and solvents||Fluoro ether SLFE1508||
1. Gasket materials - Fluoropolymer NEOFLON PFA
NEOFLON PFA is the best suited gasket material for long term use in lithium-ion batteries due to the excellent sealing performance, electrolyte resistance, and moisture barrier.
Comparison of recovery rates
Swelling test in electrolyte
2. Cathode binder - Fluoropolymer NEOFLON VT-475
NEOFLON VT-475 is an additive of PVdF binder for lithium-ion battery and it contributes to high energy density electrode for a new lithium-ion battery design.
NEOFLON VT-475 improves ﬂuidity decrease of the slurry at coating process. Especially high nickel-based active materials such as NMC811 and NCA, NEOFLON VT-475 added PVdF shows signiﬁcant improvement at coating process.
NEOFLON VT-475 binder produces high density (higher than 3.6 g/cc) and thick electrodes (higher than 30 mg/cm2) with no cracking up winding. It enables high energy density electrodes.
3. Cathode binder with SWCNT - NEOFLON VTD-475N (under development)
NEOFLON VTD-475N is a NMP dispersion which includes NEOFLON VT-475 and TUBALL TM.
It can increase the electric conductivity with small dosage of CNT, and then, increase the energy density.
- - Increase the energy density
- - Flexibility
- - Slurry stability
SWCNT (TUBALL TM)
- - Higher adhesion
- - Higher electric conductivity
- - Increase the energy density (higher active material amount)
Cathode formulation example
[Conventional] Active material / CB / Binder = 97 / 1.5 / 1.5 (wt%)
[New] Active material TUBALL ™ / CB / Binder
= 98.52 / 0.08 / 0.4 / 1.0(wt%)
Cathode SEM image of NEOFLON VTD-475N
(VT-475 with TUBALL TM)
4. Cathode binder for dry process - POLYFLON BDP (under development)
Current wet process for making the cathode needs to make the slurry and heat-up. If the dry process is applied, it’s cost eﬀective and eco-friendly because of NMP free.
POLYFLON BDP binder is suitable for this dry process of conventional lithium-ion battery as well as all-solid-state battery.
5. Electrolyte additives and solvents - Fluoro ether SLFE1508 (under development)
Daikin ﬂuoro ether SLFE1508 has excellent oxidation resistance and no ﬂash point. The electrolyte with SLFE1508 can improve the battery performance for Si anode.
Excellent oxidation resistance and safety performance
SLFE1508 gives higher oxidation resistance to electrolyte.
SLFE1508 also has no ﬂash point, therefore it can increase the electrolyte ﬂash point.
Excellent cycle life
SLFE1508 signiﬁcantly improves the capacity reduction caused by the Si anode expansion and contraction, which is the same improvement eﬀect as FEC.
Suppression of resistance increase
By suppressing the decomposition of the electrolyte, SLFE1508 can suppress the resistance increase.
Suppression of gas generation
SLFE1508 has outstanding stable chemical stability compared to FEC which is a commonly used as anode additive.
SLFE1508 can reduce the gas generation while FEC generates decarboxylation gas.