Structural evolution of plasma sprayed amorphous Li4Ti5O12 electrode and ceramic/polymer composite electrolyte during electrochemical cycle of quasi-solid-state lithium battery

Abstract

Solid-state batteries are one of the effective way to solve the safety of traditional power and energy storage batteries with flammable liquid electrolyte. This time, a quasi-solid-state lithium battery is assembled by plasma sprayed amorphous Li 4 Ti 5 O 12 (LTO) electrode and ceramic/polymer composite electrolyte with a little liquid electrolyte (10 μl/cm 2 ) to provide the outstanding electrochemical stability and better than normal interface contact. SEM, STEM, TEM and EDS were used to analyze the structure evolution and performance of plasma sprayed amorphous LTO electrode and ceramic/polymer composite electrolyte before and after electrochemical experiments. By comparing the electrochemical performance of the amorphous LTO electrode and the traditional LTO electrode, the electrochemical behavior of different electrodes is studied. The results show that plasma spraying can prepare an amorphous Li 4 Ti 5 O 12 electrode coating of about 8 μm. After 200 electrochemical cycles, the structure of the electrode evolved, and the inside of the electrode fractured and cracks expanded, because of recrystallization at the interface between the rich fluorine compounds and the amorphous LTO electrode. Similarly, the ceramic/polymer composite electrolyte has undergone structural evolution after 200 cycles test. The electrochemical cycle results show that the cycle stability, capacity retention rate, coulomb efficiency, and internal impedance of amorphous LTO electrodes are better than traditional LTO electrode. This innovative and facile quasi-solid-state strategy is aimed to promote the intrinsic safety and stability of working lithium battery, shedding light on the development of next-generation high-performance solid-state lithium batteries.

Novel 3D grid porous Li4Ti5O12 thick electrodes fabricated by 3D printing for high performance lithium-ion batteries

“…4(c)). η app values of printable inks are in the same range as our previous study [54]. The storage modulus G′ is larger than the loss modulus G′′ when the shear stress is below the intersection point of two curves, indicating that the prepared ink exhibits solid-like characteristics at low shear stress (Fig.…”

“…LTO is a promising anode material that has been selected as the candidate for 3D-printed Li-ion batteries due to its nearly zero volume change during the charging and discharging process [53,54]. In this study, a comprehensive investigation on the effects of various electrode parameters including the electrode porosity, active materials' particle diameter, electronic conductivity, electrode thickness, line width, and pore size on electrochemical performance were conducted for 3D grid porous LTO electrodes.…”

Zn 0.5Co 0.5Mn 0.5Fe 0.5Al 0.5Mg 0.5O 4 high-entropy oxide with high capacity and ultra-long life for Li-ion battery anodes

“…In addition, the high operating potential of TMO anodes would decrease the energy density of the LIBs, because the energy density is proportional to the voltage output of the whole battery cell [6]. However, their practical application in flexible/wearable electronics is hindered by several fundamental issues such as low Coulombic efficiency, the formation of unstable solid electrolyte interphase (SEI) film, large potential hysteresis, as well as poor cycling stability and rate capability [7]. In addition, the low electrical conductivity of TMObased anodes is also an important factor limiting their practical applications.…”

High-performance Ta-doped Li7La3Zr2O12 garnet oxides with AlN additive

“…Lithium-ion batteries (LIBs) are almost dominating every aspect of our daily e-life, such as 3C electronic products and electric vehicles, and promising in grid-level energy storage systems [1][2][3]. However, the current LIBs have almost reached the peak in the matter of energy density, power density, cycle life, and safety [4][5][6][7]. As the most attractive anode, the lithium metal has an ultrahigh theoretical specific capacity of 3860 mAh•g -1 , a low gravimetric density (0.534 g•cm -3 ), and the lowest redox potential (−3.040 V vs. standard hydrogen electrode (SHE)) [8][9][10].…”