Lightweight solid electrolytes for safer lithium-ion batteries, Lithium-ion batteries are everything, from cellphones to cars. However, the latest incidents with fire or explosion on this device indicate that a safer battery is needed.
One possibility is to replace flammable liquid electrolytes with solid electrolytes (SSE).
However, some of the most frequently studied SSEs are self-igniting and leaving the original security problem unanswered. Researchers now report in ACS Nano Letters that they have developed an unburned SSE. The Lightweight solid electrolytes for safer lithium-ion batteries.
Conventional lithium-ion batteries consist of a cathode and anode, which are separated by a liquid electrolyte and a thin piece of porous plastic. If the battery is damaged, e.g. B. if the overload or if the bulge of the lithium needle rises and damages the plastic separator, the electrolyte can ignite.
Scientists are experimenting with various solutions, e.g. B. Add a flame retardant to the electrolyte or replace the separator and the soft and flammable electrolyte with SSE.
However, modern SSE has its own limitations, including fragility and severity.
Fragility can be reduced using SSE polymers, but lithium needles can still solve this soft material. SSE polymer / ceramic composites overcome this problem, but most of this material is still flammable. Yi Cui and his colleagues wanted to create a safer alternative. Lightweight solid electrolytes for safer lithium-ion batteries.
The team developed an SSE consisting of porous mechanical support (polyimide film), flame retardant (decabromodiphenylethane) and polymer electrolytes (polyethylene oxide / lithium lithium [trifluoromethane sulfulfonil] imide).
Researchers say this is the first super-light based SSE that is fire resistant. In fact, batteries made by SSE still work well when exposed to fire.
In addition, the new SSE offers energy density and performance that is at least comparable to conventional lithium-ion batteries. Lightweight solid electrolytes for safer lithium-ion batteries.