Solid-state batteries (SSBs) are considered as the most promising next-generation high-energy-density energy storage devices due to their ability in addressing the safety concerns from organic electrolytes and enabling energy dense lithium anodes. To ensure the high energy density of SSBs, solid-state electrolytes (SSEs) are required to be thin and light-weight, and simultaneously offer a wide electrochemical window to pair with high-voltage cathodes. However, the decrease of SSE thickness and delicate structure may increase the cell safety risks, which is detrimental for the practical application of SSBs. Herein, to demonstrate a high-energy-density SSB with sufficient safety insurance, an ultrathin (4.2 µm) bilayer SSE with porous ceramic scaffold and double-layer Li⁺-conducting polymer, is proposed. The fire-resistant and stiff ceramic scaffold improves the safety capability and mechanical strength of the composite SSE, and the bilayer polymer structure enhances the compatibility of Li metal anode and high-voltage cathodes. The 3D ceramic facilitates Li-ion conduction and regulates Li deposition. Thus, high energy density of 506 Wh kg⁻¹ and 1514 Wh L⁻¹ is achieved based on LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) cathodes with a low N/P ratio and long lifespan over 3000 h. High-energy-density anode-free cells are further demonstrated.

中文翻译：

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由亚 5 µm 固体聚合物电解质实现的高能量密度固态锂金属电池

固态电池（SSB）被认为是最有前途的下一代高能量密度储能设备，因为它们能够解决有机电解质的安全问题并实现能量密集的锂负极。为了确保 SSB 的高能量密度，固态电解质 (SSE) 需要既薄又轻，同时提供宽的电化学窗口以与高压阴极配对。然而，SSE厚度的减小和精细的结构可能会增加电池的安全风险，不利于SSB的实际应用。在此，为了展示具有足够安全保障的高能量密度 SSB，具有多孔陶瓷支架和双层 Li ⁺的超薄（4.2 µm）双层 SSE- 导电聚合物，建议。耐火且坚硬的陶瓷支架提高了复合SSE的安全能力和机械强度，双层聚合物结构增强了锂金属负极和高压正极的相容性。3D 陶瓷促进锂离子传导并调节锂沉积。因此，基于具有低 N/P 比和超过 3000 小时的长寿命的LiNi _0.8 Co _0.1 Mn _0.1 O ₂ (NCM811) 正极，实现了 506 Wh kg ^-1和 1514 Wh L ^{-1 的}高能量密度。进一步证明了高能量密度无阳极电池。