All solid-state batteries are of key importance in the development of next-generation energy storage devices with high energy density. Herein, we report the fabrication and operation of bulk-type 5 V-class all solid-state batteries consisting of LiNi 0.5 Mn 1.5 O 4 cathode, Li 10 GeP 2 S 12 solid-electrolyte, and Li metal anode. The 1st discharge capacity is about 80 mAh g −1 with an average voltage of 4.3 V. The discharge capacity gradually decreases during the subsequent cycles. Xray diffraction and electrochemical impedance spectroscopy measurements reveal that the capacity fading results from the growth of a resistive interfacial layer on the cathode composite. The development of suitable conductive additive and sulfide solid electrolyte materials is essential for the development of high-voltage all solid-state batteries.
LIBs) are desirable to significantly increase to fulfill the growing demand for long distance per each charge. For this reason, next generation batteries such as Li-S, Li-O 2 , and Li-metal with exceptional energies have been attracted much attention as potential candidates due to their outstanding performances. [1][2][3][4][5] However, unfortunately, as a substantial amount of electrochemical energy should be stored in a confined volume, these systems are thermodynamically unstable, which could be a risk for safety incidents.In an attempt to overcome these drawbacks, the all-solid-state batteries (ASSBs) with all-solidified components are now considered as a promising next-generation technology beyond state-of-the-art LIBs. [6] The fascinating features of the ASSBs lie in the opportunity of enhancing energy density and surmounting the intrinsic shortcomings of conventional liquid-based batteries, such as electrolyte leakage, flammability, narrow voltage window, and low lithium ion transport number. In other words, the ASSBs are promising systems due to nonvolatile, nonexplosive, and stability up to ≈6.0 V versus Li/Li + . [6][7][8][9][10] In particular, if lithium metal can be employed as an anode material and interfacial stability can be improved, [11,12] it can be possible to achieve high energy and power density. These extraordinary properties of the ASSBs have extensively stimulated scientific and industry communities to the ASSB's research.In order to achieve superior electrochemical performances of the ASSBs, not only improving interfacial stability during the cycling, but balancing both ionic and electronic conductivities of composites is of crucial importance. For instance, while the electronic pathways appear to be more important for the high energy density ASSBs operating at relatively low current density, the sufficient ion transport is a more critical factor at high rate operations for the high power density ASSBs, [13,14] although the cell performances are relatively related to diverse factors such as the operating pressure/temperature, particle size, and composition in the electrode. In terms of enhancement of the ionic conductivity, extensive efforts for developing solid electrolyte (SE) with high ionic conductivity have been conducted for past few decades. Among diverse candidates, much attention has been focused on the sulfide-based SE including Li 10 GeP 2 S 12 (LGPS), [7,15] β-Li 3 PS 4 , [16] Li 7 P 3 S 11 , [17] Li 2 S-P 2 S 5 , [18] and argyrodite All-solid-state batteries (ASSBs) have lately received enormous attention for electric vehicle applications because of their exceptional stability by engaging all-solidified cell components. However, there are many formidable hurdles such as low ionic conductivity, interface instability, and difficulty in the manufacturing process, for its practical use. Recently, carbon, one of the representative conducting agents, turns out to largely participate in side reactions with the solid electrolyte, which finally leads to the formation of insulating sid...
The high theoretical energy densities of lithium-air batteries (LAB) make this technology an attractive energy storage system for future mobility applications. Li2O2 growth process on the cathode relies on the surrounding chemical environment of electrolytes. Low conductivity and strong reactivity of Li2O2 discharge products can cause overpotential and induce side reactions in LABs, respectively, eventually leading to poor cyclability. The capacity and reversibility of LABs are highly susceptible to the morphology of the Li2O2 discharge products. Here, we identify for the first time that a seed layer formed by the combination of a cathode and an electrolyte determines the morphology of Li2O2 discharge products. This seed layer led to its high reversibility with a large areal capacity (up to 10 mAh/cm2). Excellent OER (oxygen evolution reaction) was achieved by the formation of a favorable interface between the carbon electrode and electrolyte, minimizing the decomposition of the electrolyte. These remarkable improvements in LAB performance demonstrate critical progress toward advancing LAB into practical uses, which would exploit good reversibility of LABs in pouch-type cell arrangements with 1.34 Ah.
LiNbO 3 -coated LiNi 0.5 Mn 1.5 O 4 powders were synthesized by a sol-gel method, and their intercalation property as a cathode material was investigated using all-solidstate batteries with Li 10 GeP 2 S 12 solid electrolyte and In-Li metal anode. The LiNbO 3 coating delivered reversible lithium intercalation of LiNi 0.5 Mn 1.5 O 4 through an electrochemical interface with the Li 10 GeP 2 S 12 . Oxygen-deficient LiNi 0.5 Mn 1.5 O 4-δ with a higher electronic conductivity than LiNi 0.5 Mn 1.5 O 4 improved the intercalation © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 2activity. An all-solid-state battery consisting of 3 wt.%-LiNbO 3 -coated LiNi 0.5 Mn 1.5 O 4δ /Li 10 GeP 2 S 12 /In-Li exhibited a discharge capacity of 80 mAh g -1 at the first cycle with an average discharge voltage of 4.1 V (vs. In-Li), which demonstrates the possibility of 5 V class all-solid-state batteries with a high voltage spinel cathode.
Li–O2 batteries attract extensive attention because they exhibit the highest theoretical energy density among the rechargeable batteries reported so far. However, most studies have focused on improving the cyclability and...
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