Development of 4V-Class Bulk-Type All-Solid-State Lithium Rechargeable Batteries by a Combined Use of Complex Hydride and Sulfide Electrolytes for Room Temperature Operation

Abstract

We have operated a 4V-class bulk-type, all-solid-state LiCoO 2 /Li battery at room temperature. The battery consisted of a Li 4 (BH 4 ) 3 I complex hydride electrolyte as the electrolyte layer, and a 80Li 2 S 20P 2 S 5 sul de glass as an electrolyte in the positive electrode layer. The assembled battery exhibited a 92 mAh g −1 initial discharge capacity at 298 K and 0.1 C. The discharge capacity for the 20 th cycle remained as high as 83 mAh g −1 , corresponding to a capacity retention ratio of nearly 90%.

Lightweight complex metal hydrides for Li-, Na-, and Mg-based batteries

“…A smooth operation of the cell was possible due to very limited charge transfer resistance at the SSE/cathode interface, resulting from a tight contact among electrode constituents. The successful demonstration of the all-solid-state LIB with Li 4 (BH 4 ) 3 I at RT (298 K) was also reported by Unemoto et al The cell comprised the LiNbO 3coated LiCoO 2 and 80Li 2 SÁ20P 2 S 5 (LPS) composite electrode, and the Li anode[19]. At the C-rate of 0.1, the discharge capacity was reduced from 92 to 82 mA h/g between the 1st and 20th cycle and the capacity retention was 90%.…”

“…The oxidative stability of Li 4 (BH 4 ) 3 I as SSE was evaluated based on the performance of TiS 2 -Li batteries with the TiS 2 / LiBH 4 and TiS 2 /Li 4 (BH 4 ) 3 I composite electrodes [19]. Both cells were tested at 393 K with the discharge-charge rate of 0.05C.…”

“…In general, formation of inactive by-products at the oxide/borohydride-based SSE contact increases the interfacial resistance, which eventually hinders the transfer of Li 1 /electrons in the cathode. To suppress this effect, various coating/buffer layers (e.g., LiNbO 3 [19], Li 2 PO 4 [77], Li 3 BO 3 [80]) have been successfully applied and prevented undesired interactions between the cathode and SSE, which in turn improved the reversibility and durability of the investigated SSBs. The oxide-cathode batteries with borohydride-based SSE often also suffer due to poor electrode/SSE contacts.…”

Beyond Typical Electrolytes for Energy Dense Batteries

“…This was accompanied by hydrogen release and formation of a new phase, identified to most likely be Li 2 B 12 H 12 . Later studies examined this cathode with other LiBH 4 based electrolytes such as Li 4 (BH 4 ) 3 I, combined with either TiS 2 /LiBH 4 or TiS 2 /Li 4 (BH 4 ) 3 I composite electrodes [111]. The higher durability of the cell consisting of TiS 2 /Li 4 (BH 4 ) 3 I composite electrodes underscored the importance of the high mechanical plasticity in the I − -substituted LiBH 4 .…”

Characterization of All Solid State Batteries with LiPON Thin Films Obtained with Different Substrates and RF Sputtering Times

“…Although Li-sulfide and Li-oxide electrolytes have higher ionic conductivity (10 ¹3 ³10 ¹4 S•cm ¹1 ), these two electrolytes are easily decomposed when being in contact with Li anode and the applied potential is up to 5.0 V. 5,8) Lithium phosphorus oxynitride (LiPON) thin film, initially reported by Oak Ridge National Laboratory 9) in 1990s, has gradually become a better alternative as the solid electrolyte. LiPON acronym describes a class of compounds with the general composition Li x PO y N z , wherein the stoichiometric coefficients: x = 2y + 3z ¹ 5.…”