Towards a high conductive and safer lithium battery electrolyte

high conductive and safer lithium battery from SPECIFIC POLYMERS

DATE

Fevrier 2019

For decades, lithium battery (LiB) has been growing at a very fast pace owing to its considerable advantages, notably in terms of energy density. However, with the development of high energy consuming devices, more and more powerful and fast charging Li-ion batteries are required. Thus, limitation of energy density and safety issues observed lead to perform suitable technology as Li-Metal batteries. Compared to Li-ion technology, this battery uses lithium metal as anode material requiring a gel polymer electrolyte (GPE) or a solid polymer electrolyte (SPE) to limit or suppress dentritic growth. Chemistry, performance, cost and safety characteristics vary across LIB types. Within this scope, for couple years SPECIFIC POLYMERS contributes to the development of tomorrow’s lithium battery electrolyte by the production of a large range of lithium salts, conductive polymers, additives and plasticizers.

Lithium Salts Derivates

SPECIFIC POLYMERS commercializes LiTFSI derivatives, MTFSILi (SP-49-023) and STFSILi (SP-59-011), as promising single lithium-ion conductive polymer electrolyte. Indeed, TFSI moiety is considered as the best candidate for Li salt in lithium batteries and LiTFSI is highly soluble in the usual solvents. Studies on their polymerization and development of new salts are underway.

MTFSILi

Poly(MTFSILi)

STFSILi

Poly(STFSILi)

Conductive Polymers

Within GPE or SPE, lithium conductivity is predominantly ensured by polyethylene glycol (PEO), polypropylene glycol (PPO) or polyesters. Polymers composition and architecture can be tuned to promote SPE self-organization and thus improve lithium conductivity, limit transference or avoid dendrites. SPECIFIC POLYMERS possesses a rich brochure of functionals PEO and PEO/PPO with various molecular weight or PEO/PPO ratio. Moreover, thanks to SPECIFIC POLYMERS expertise, on-demand polymer synthesis can be performed by conventional or controlled radical polymerization (RAFT or ATRP). In addition, our macromonomers can found interest either in radical or cationic UV-polymerization or sol-gel
chemistry.

Poly(ethylene glycol), α-methoxy, ω-acrylate

Poly(ethylene glycol), α-methoxy, ω-glycidyl Ether

Poly(ethylene glycol), α-methoxy, ω-triethoxysilane

Additives and Plasticizers

Additives and plasticizers are widely used to enhance the performance and the safety of GPE and SPE. To avoid safety issues due to leak or flammability risks, SPECIFIC POLYMERS develops low vapor pressure compounds as cyclic carbonate or organosilicon. Low viscosity, high mobility, large electrochemical stability window and high dielectric constant enable electrolyte performances improvement.

GMA
.

Butanediol Bis Carbonate
.

Poly(ethylene glycol), α,ω-bis(triethoxysilane)

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