| Popis: |
Solid-state lithium-metal batteries (SSLMBs) with a composite solid electrolyte (CSE) have great potential forachieving both high energy density and high safety and are thus promising next-generation energy storagedevices. The current bottlenecks are a high electrode/electrolyte interface resistance and the limited Li+conductivity of the solid electrolyte layer. To reduce the interface resistance, a tape casting method isused to directly deposit a CSE layer (20 mm) onto a model LiFePO4 cathode. The CSE slurry infiltratesthe cathode layer, forming a Li+ conduction network and ensuring intimate contact between the CSEand the cathode. The tape casting parameters, such as the polymer/Li salt ratio, inorganic filler fraction,and casting thickness, for the CSE layer are investigated. To increase Li+ conductivity, Ce substitution isconducted for Li7 La3Zr2−xCexO 12, x ¼ 0–0.15. The effects of Ce content on the specific capacity, ratecapability, and cycling stability of Li//CSE//LiFePO4 cells are systematically studied. Li 7 La3Zr1.9 Ce0.1O 12(i.e., x ¼ 0.1) is found to be the optimal composition; it outperforms Li7 La3Zr2O 12 andLi 6.25Ga0.25 La3Zr2O12 in terms of CSE conductivity and SSLMB charge–discharge performance. |
