Size Effect of a Piezoelectric Material as a Separator Coating Layer for Suppressing Dendritic Li Growth in Li Metal Batteries

Abstract

Li metal has been intensively investigated as a next-generation rechargeable battery anode. However, its practical application as the anode material is hindered by the deposition of dendritic Li. To suppress dendritic Li growth, introducing a modified separator is considered an effective strategy since it promotes a uniform Li ion flux and strengthens thermal and mechanical stability. Herein, we present a strategy for the surface modification of separator, which involves coating the separator with a piezoelectric material (PM). The PM-coated separator shows higher thermal resistance than the pristine separator, and its modified surface properties enable the homogeneous regulation of the Li-ion flux when the separator is punctured by Li dendrite. Furthermore, PM was synthesized in different solvents via solvothermal method to explore the size effect. This strategy would be helpful to overcome the intrinsic Li metal anode problems.

Thermally Stable Ceramic-Salt Electrolytes for Li Metal Batteries Produced from Cold Sintering Using DMF/Water Mixture Solvents

“…To overcome this limitation, Li metal is being explored as a next-generation anode, due to its low electrochemical potential (−3.04 V vs. SHE) and high specific capacity (3860 mAh g −1 ), which is ten times greater than that of graphite [2,[7][8][9][10][11][12][13]. However, the use of liquid electrolytes in Li metal batteries poses a challenge due to flammable explosions caused by Li dendrite growth and short circuits [14][15][16][17][18][19][20][21][22].…”

Low‐Resistance LiFePO4Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

“…[1,2] Lithium-ion batteries (LIBs) serve as the primary power source in EVs, and their performance indices are directly determined by the cathode material. [3][4][5] LiFePO 4 (LFP) is an ideal cathode material for LIBs due to its environmental sustainability, cost advantages, long service life, and thermal stability up to 270 °C. [3,6] In 2021, Tesla Inc. announced its decision to switch the cell chemistry in its massmarket EVs from Li[Ni 1ÀxÀy Co x Al y ]O 2 (NCA) to LFP.…”