3D Ion‐Conducting, Scalable, and Mechanically Reinforced Ceramic Film for High Voltage Solid‐State Batteries

Abstract

Concerning the safety aspects of Li+ ion batteries, an epoxy‐reinforced thin ceramic film (ERTCF) is prepared by firing and sintering a slurry‐casted composite powder film. The ERTCF is composed of Li+ ion conduction channels and is made of high amounts of sintered ceramic Li1+xTi2‐xAlx(PO4)3 (LATP) and epoxy polymer with enhanced mechanical properties for solid‐state batteries. The 2D and 3D characterizations are conducted not only for showing continuous Li+ ion channels thorough LATP ceramic channels with over 10−4 S cm−1 of ionic conductivity but also to investigate small amounts of epoxy polymer with enhanced mechanical properties. Solid‐state Li+ ion cells are fabricated using the ERTCF and they show initial charge–discharge capacities of 139/133 mAh g−1. Furthermore, the scope of the ERTCF is expanded to high‐voltage (>8 V) solid‐state Li+ ion batteries through a bipolar stacked cell design. Hence, it is expected that the present investigation will significantly contribute in the preparation of the next generation reinforced thin ceramic film electrolytes for high‐voltage solid‐state batteries.

Progress and perspective of Li1 + xAlxTi2‐x(PO4)3 ceramic electrolyte in lithium batteries

“…With incorporation of LATP/PAN fibers, the T g of PEO polymer decreases from À34.2 to À37.5 C, resulting in four times ionic conductivity higher than that of PEO-LiTFSI at 60 C. However, the LATP particles cannot directly contact with each other in this kind of SCE. Afterward, Kim et al 139 prepared an epoxy-reinforced thin ceramic film (ERTCF), which consists of continuous Li + channels constructed by over 86 vol% LATP ceramic powders and small amounts of epoxy polymer. The preparation method is as follows: the LATP powders were dissolved in mixture of ethanol and silane using fish oil as dissolvent, then the polyvinyl butyl alcohol as binders, and the butyl benzyl phthalate as plasticizers were added to the slurry.…”

Ionic liquid/poly(ionic liquid)-based electrolytes for lithium batteries

“…However, liquid leakage and electrochemical instability limit their use in high energy density battery systems where safety is a key concern. [21,45,46] New solid-state battery systems based on quasi-solid gel electrolytes and solid electrolytes are providing increased energy density and operational stability. [47,48] Please do not adjust margins…”

Fundamentals of the Cathode‐Electrolyte Interface in All‐solid‐state Lithium Batteries

“…[112][113][114][115] The advantage of this approach is that it can increase the effective interface contact area and mitigate contact degradation while retaining a continuous Li + channels due to volume change by carrying more CAM through a loose porous structure, thus increasing the volumetric and gravimetric energy density of ASSBs. [116] The scaffold structure with high porosity can be achieved by tapecasting oxide SE slurries on the top of a dense pellet, after which the pore-forming agents, such as cornstarch [112] and PMMA spheres, [117] are burned off, forming pores and cavities in bulk oxide SEs. A wide range of cathode materials can be subsequently infiltrated into the pores by slurry coating.…”