Key points are not available for this paper at this time.
A Composite cathode without polymer binder was prepared by a one-step sintering method employing spark plasma sintering (SPS) of laminated LiCoO 2 and Li 3 BO 3 pellets. The amorphous Li 3 BO 3 solid electrolyte melted during the sintering process. For better characterization of the composite cathode, a liquid electrolyte was used in the battery test. However, the active material was mainly in the all-solid-state environment. The specific capacity of the composite cathode was found to be dependent on its thickness. The 0.2 mm thick composite cathode showed a high specific discharge capacity of 99 mAh g −1 at 0.5 C rate, excellent cycling performance over 10 cycles, and good rate capability of about 93.2 mAh g −1 with 94% retention capacity. In addition, the composite cathode showed an initial discharge capacity of 0.25 mAh g −1 . The discharge capacity after 3 cycles under the all-solid-state condition was 0.22 mAh g −1 . The SEM and TEM results showed that the melted Li 3 BO 3 solid electrolyte synthesized by the SPS process produced Li+ ion transport pathways, which reduced the grain boundary resistance. Hence, this composite cathode consisting of LiCoO 2 as the cathode, amorphous Li 3 BO 3 as the solid electrolyte, and MWCNT as the electric conductor is a promising material for all-solid-state batteries and bulk-type hybrid solid-state batteries.
Woo et al. (Mon,) studied this question.