In order to increase the specific surface area of the electrode and reduce the resistance, the electrode active material is basically selected as a powder material, so a binder is required for bonding. Its main function is to make the electrode active material and conductive agent firmly adhere to the current collector, prevent the active material particles from falling off due to swelling during battery charging and discharging, and reduce the impedance between the current collector and the electrode material.

PVDF binder exhibits excellent performance in traditional battery systems and is the most common binder in lithium-ion battery cathode slurry. With the global emphasis on environmental protection and sustainable development and the promulgation of the PFAS Act, the search for alternatives to PVDF has become an urgent need in the industry, so the development of fluorine-free binders has become an important direction in the industry.

Jin Tianchi Company has a first-class core technology research and development team. After several years of painstaking research, Jin Tianchi Company has designed and developed an environment-friendly fluorine-free adhesive-fluorine-free adhesive for lithium battery positive electrodes, which has passed the test in head lithium battery customers (such as Ningde Times). The fluorine-free gel has high electrochemical stability, electrolyte resistance, faster processing and dissolution, 50% to 70% of the original PVDF dosage of the formula recommend, can meet the requirements of various lithium batteries for the binder of positive electrode materials, and is more friendly to the environment and human contact. The following is the feedback on the application of fluorine-free glue in major battery systems:

1. LCO system

The earliest product development system, the current product has been finalized, can completely replace PVDF, the amount of 30% reduction.
2. NCM system

Completely replace PVDF, reduce the amount of 30%, high nickel system electrical performance is much better than PVDF.
3. NM high pressure system

Completely replace PVDF, reduce the dosage by 50%, the density of pole piece on one side reaches 20mg/c ㎡, and the CV stability exceeds 5V.
4. LFMP system

At present, PVDF is mixed with fluorine-free glue 1:1, the expansion of the battery core becomes better, the precipitation of manganese is greatly reduced, and the capacity is increased by 1.5; it can be completely replaced in the future.
5. Na electric system

Completely replace PVDF, reduce the dosage by 30% ~ 50%, solve the problem of sodium electric positive electrode gel, no need to add oxalic acid, avoid gas.

Keywords: SBR CMC flexible agent cracking agent coated carbon aluminum foil adhesive graphene