MI 2020 Solutions FINAL

SECTION 01
SMART GRIDS & ENERGY STORAGE
05
DEVELOPMENT OF ORGANIC-INORGANIC
HYBRID SOLID ELECTROLYTES FOR
MEDIUM-LARGE-SIZED SEMI-SOLID
LITHIUM RECHARGEABLE BATTERIES
KOREA
CHALLENGE
The lithium-ion batteries (LIBs)
that are currently available
use flammable organic liquid
electrolytes, posing a potential
fire and explosion hazard.
INNOVATION
This project sought to replace
liquid electrolytes with safer
solid electrolytes in lithium-ion
batteries.
This required the team to
overcome low ionic conductivity
and deterioration of performance
characteristics due to high
resistance in the degradation
of contact with the anode and
cathode that occurs during cell
manufacturing.
A soft, half solid-state electrolyte
material was designed that can
be directly coated onto
electrodes by mixing in a
fluoropolymer, a ceramic
solid electrolyte that features
enhanced conductivity, with a
small amount of liquid electrolyte,
before making the mixture into
a film.
The electric energy storage
capacity of the new battery is
about 95% of the capacity of
the conventional LIB but with
enhanced safety.
ACTION
The ionic conductivity of a LLZO
ceramic electrolyte was improved
to as much as a fifth of the level
found in conventional liquid
electrolytes and separators.
By applying this technology,
an organic-inorganic hybrid
solid electrolyte with enhanced
ionic movement capability was
designed and developed that is
more than 50% better than the
level found in conventional liquid
electrolytes and separators.
POTENTIAL
Developing a lithium secondary
battery that features highsafety
solid electrolytes, which
performs as well as organic liquid
electrolytes, will enable LIB use
in electric vehicles and energy
storage systems, while ensuring
public safety.
18 19