The high-resistive grain boundaries are the bottleneck for Li
+
transport in Li
7
La
3
Zr
2
O
12
(LLZO) solid electrolytes. Herein, high-conductive LLZO thin films with cubic phase and amorphous domains between crystalline grains are prepared, via annealing the repetitive LLZO/Li
2
CO
3
/Ga
2
O
3
multi-nanolayers at 600 °C for 2 h. The amorphous domains may provide additional vacant sites for Li
+
, and thus relax the accumulation of Li
+
at grain boundaries. The significantly improved ionic conductivity across grain boundaries demonstrates that the high energy barrier for Li
+
migration caused by space charge layer is effectively reduced. Benefiting from the Li
+
transport paths with low energy barriers, the presented LLZO thin film exhibits a cutting-edge value of ionic conductivity as high as 6.36 × 10
−4
S/cm, which is promising for applications in thin film lithium batteries.
A single-channel SiC trench MOSFET (SC-TMOS) with integrated trench MOS barrier Schottky diode (TMBS) is proposed and investigated in this paper. The electric field at the Schottky interface is reduced to 0.37 MV cm −1 by the trench MOS and P + shield under the gate, which completely suppresses the leakage current through the TMBS. The on-state voltage drop (V R_ON ) of the SC-TMOS in reverse conduction state is reduced to 1.59 V (@J SD = 400 A cm −2 ) compared to 2.93 V of the PN body diode of a conventional trench MOSFET (C-TMOS) and 1.61 V of a three-level protection trench MOSFET (TP-TMOS). Meanwhile, higher BFOM (Baliga's figure of merit: BV 2 /R on,sp ) is obtained, which is 11.8% and 40% improved compared with those of the C-TMOS and TP-TMOS, respectively. Besides, the reverse recovery charge of the SC-TMOS is reduced by 41.7% and 66.4% compared with those of the C-TMOS with or without external junction barrier Schottky diode (JBS), and is comparable with that of the TP-TMOS. Moreover, with optimized design, C GS and C GD decrease dramatically. As a result, the total inductive switching loss of the proposed SC-TMOS is reduced by 19.5%, 43.2% and 28.8% compared with those of the C-TMOS with or without external JBS and TP-TMOS, respectively.
The practical application of the Li metal anode (LMA) is hindered by its low coulombic efficiency and dendrite formation. Although solid‐state electrolytes hold promise as ideal partners for LMA, their effectiveness is limited by the poor workability and ionic conductivity. Herein, a modified separator combining the rapid Li+ transport of a liquid electrolyte and the interfacial stability of a solid‐state electrolyte is explored to realize stable cycling of the LMA. A conformal nanolayer of LiPON is coated on a polypropylene separator by a scalable magnetron sputtering method, which is compatible with current Li‐ion battery production lines and promising for the practical applications. The resulting LMA–electrolyte/separator interface is Li+‐conductive, electron‐insulating, mechanically and chemically stable. Consequently, Li|Li cells maintain stable dendrite‐free cycling with overpotentials of 10 and 40 mV over 2000 h at 1 and 5 mA cm‐2, respectively. Additionally, the Li|LiFePO4 full cells achieve a capacity retention of 92% after 550 cycles, confirming its application potential.
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