A High‐Performance Li–B–H Electrolyte for All‐Solid‐State Li Batteries

Abstract

Highly Li‐ion conductive Li4(BH4)3I@SBA‐15 is synthesized by confining the LiI doped LiBH4 into mesoporous silica SBA‐15. Uniform nanoconfinement of P63 mc phase Li4(BH4)3I in SBA‐15 mesopores leads to a significantly enhanced conductivity of 2.5 × 10−4 S cm−1 with a Li‐ion transference number of 0.97 at 35 °C. The super Li‐ion mobility in the interface layer with a thickness of 1.2 nm between Li4(BH4)3I and SBA‐15 is believed to be responsible for the fast Li‐ion conduction in Li4(BH4)3I@SBA‐15. Additionally, Li4(BH4)3I@SBA‐15 also exhibits a wide apparent electrochemical stability window (0 to 5 V vs Li/Li+) and a superior Li dendrite suppression capability (critical current density 2.6 mA cm−2 at 55 °C) due to the formation of stable interphases. More importantly, Li4(BH4)3I@SBA‐15‐based Li batteries using either high‐capacity sulfur cathode or high‐voltage oxide cathode show excellent electrochemical performances, making Li4(BH4)3I@SBA‐15 a very attractive electrolyte for next‐generation all‐solid‐state Li batteries.

Rechargeable Lithium Metal Batteries with an In‐Built Solid‐State Polymer Electrolyte and a High Voltage/Loading Ni‐Rich Layered Cathode

“…SSEs of contemporary interest generally fall into two categories: inorganic ceramic electrolytes and solid‐state polymer electrolytes (SPEs). Inorganic materials including oxides and sulfides are investigated because they possess high ambient temperature ionic conductivities, even surpassing those of their liquid electrolyte counterparts in some cases 3,4. However, the intrinsic rigidity, brittleness, and environmental sensitivity continue to pose significant challenges to the development of practical cells based on such materials.…”

“…Inorganic materials including oxides and sulfides are investigated because they possess high ambient temperature ionic conductivities, even surpassing those of their liquid electrolyte counterparts in some cases. [3,4] However, the intrinsic rigidity, brittleness, and environmental sensitivity continue to pose significant challenges to the development of practical cells based on such materials. Furthermore, battery cells based on poorly conductive active materials require intimate/conformal contact between the electrolyte and electrode to achieve short-enough transportation distances in the electrode to ensure complete active material utilization.…”

Solid‐State Prelithiation Enables High‐Performance Li‐Al‐H Anode for Solid‐State Batteries

“…We also believe that the overall electrochemical performance of the solid‐state full cell can be further improved by i) using highly Li‐ion conductive Li‐B‐H based electrolyte to enable the stable cycling at room temperature; [ 35–41 ] ii) modifications on the cathode/electrolyte interface to avoid the formation of thick cathode electrolyte interphase film. [ 42–45 ] The above results prove that the SSPP Li‐Al‐H anode is very promising for future practical applications.…”

Chainmail Catalyst of Fe3O4@C/CNTO‐Modified Celgard Separator with Low Metal Loading for High‐Performance Lithium–Sulfur Batteries

“…It can be clearly seen that Fe 3 O 4 @C/CNTO has the best adsorption ability among the three contrastive samples, which is probably attributed to the existence of Fe 3 O 4 that can promote the chemical binding and ensure nearly complete adsorption. [13] Further, detailed electrochemical measurements were carried out by using coin batteries (CR 2032). The cyclic voltammetry (CV) tests of Fe 3 O 4 @C/CNTO and CNTO were obtained at a scan rate of 0.2 mV s À 1 with the voltage ranging from 1.7 -2.8 V. As shown in Figure 2b, two characteristic redox peaks are attributed to S 8 $ Li 2 S n (4 � n � 8) and Li 2 S n (4 � n � 8) $ Li 2 S 2 /Li 2 S reversible conversion processes, respectively.…”

“…As shown in Figure S1a, b, the cathodic peaks from high to low potential were marked as A and B, the anodic peaks from low to high potential were marked as C and D. Figure S1c-f represent fitting curves of the peak currents of CNTO and Fe 3 O 4 @C/CNTO, the cathodic and anodic peaks currents of CNTO and Fe 3 O 4 @C/CNTO exhibit the linear relationship with various scan rates, indicating a diffusion controlled electrochemical process. [13] By using Randles-Sevick equation, the D Li + was calculated based on the slop of the linear plot of the peak current (I p ) versus the square root of the scan rate (V 0.5 ). [18] Clearly, the slopes of Fe 3 O 4 @C/CNTO with the four peaks are all larger than that of CNTO, illustrating the enhanced diffusion kinetics, which is beneficial for the promotion of LiPSs conversion.…”