A garnet structure-based all-solid-state Li battery without interface modification: resolving incompatibility issues on positive electrodes

Abstract

Bulk-type SSLB based on LLZ:Ta achieves high specific areal capacity and operational current densities.

Sulfide and Oxide Inorganic Solid Electrolytes for All-Solid-State Li Batteries: A Review

“…Recently, Tsai et al [13] studied the ASSB formed when Ta-doped Li 6.6 La 3 Zr 1.6 Ta 0.4 O 12 (LLZO) solid electrolyte fabricated via solid-state sintering at 1175 • C in air was paired with LCO as the cathode without interface modifications. Ta-doped LLZO was used as the electrolyte owing to its good chemical stability when paired with the LCO cathode, which is known to be the highest electronic conductivity.…”

“…An indium foil was used as the anode to improve the interface with Ta cathodes were paired with Li metal anodes or the cathode/electrolyte interface properties, were not evaluated in this paper; however, these parameters are very important for the fabrication of ASSBs. Recently, Tsai et al [13] studied the ASSB formed when Ta-doped Li6.6La3Zr1.6Ta0.4O12 (LLZO) solid electrolyte fabricated via solid-state sintering at 1175 °C in air was paired with LCO as the cathode without interface modifications. Ta-doped LLZO was used as the electrolyte owing to its good chemical stability when paired with the LCO cathode, which is known to be the highest electronic conductivity.…”

“…Irrespective of the good redox potential observed in the cyclic voltammogram (CV) of the ASSB, the capacity faded with the cycle number owing to the gradual increase in cell polarization with cycling ( Figure 26 archers should consider analyzing the performance of the SSB with the exces ode. The galvanostatic charge-discharge profiles ( Figure 26B) of the ASSB revea e and discharge capacities were 2.01 mAh cm −2 (140 mAh g −1 ) and 1.62 mAh cm ctively, and the irreversible capacity loss and at end of the 100th cycle was app −1 , because the capacity of 1.62 mAh cm −2 (36 mAh g −1 ) was retained [13] (see T le capacity was correlated with the decrease in the number of Li + ion conductio Possible mechanisms of interface evolution were proposed using the energy-dispersive electron spectroscopy mapping of the sintered composite electrode, which revealed the presence of clean edges for La and Co between LCO and Ta-LLZO, and therefore, confirmed that no diffusion occurred during cycling. In addition, microcracks were observed on the composite electrode and electrolyte ( Figure 26), which were caused by the repetitive expansion and contraction of the electrode and caused the capacity degradation of the ASSB.…”

“…The general schematic diagram of ASSBs is presented in Figure 1. The ideal electrolyte materials for ASSBs should feature the following important properties: (i) High ionic conductivity of 10 −3 S cm -1 at room temperature, (ii) low electronic conductivity of <10 −8 S cm −1 , which prevents their self-discharge, (iii) wide electrochemical potential window, (iv) good chemical stability over the operating temperature range and toward the electrodes, (v) transference number of approximately 1, (vi) matching thermal expansion coefficients with the cathode materials, (vii) good chemical stability; no crystal structure phase transformation should occur for the electrode active materials up to/near their sintering temperatures, (viii) their sintering temperature should match that of the electrode active materials, and (xv) low toxicity and cost effective [13]. Many researchers have investigated new solid electrolytes to replace flammable liquid electrolytes or improve the performance of existing solid electrolytes and elucidate their fundamental properties and technological developments.…”

Engineering of Sn and Pre‐Lithiated Sn as Negative Electrode Materials Coupled to Garnet Ta‐LLZO Solid Electrolyte for All‐Solid‐State Li Batteries

“…investigated the impact of a very thin Li‐ alloyed layer, such as Au. By modifying the surface roughness and by introducing a thin Au layer between Li metal and the solid electrolyte, the interfacial resistance was dramatically reduced, which prevented Li dendrite growth . As an alternative to the Au layer, either a solid electrolyte doped with Nb or a thin layer of Nb deposited at the electrode/electrolyte interface can be used to improve the conductivity locally and thus to decrease the interfacial resistance .…”