The coupling of high-capacity cathodes and lithium metal anodes promises the next generation of high-energy-density batteries. However, the fast-structural degradations of the cathode and anode challenge their practical applications. Herein, we synthesize an electrolyte additive, tris(2,2,3,3,3-pentafluoropropyl) borane (TPFPB), for ultra-stable lithium (Li) metal||Ni-rich layered oxide batteries. It can be preferentially adsorbed on cathode surface to form a stable (B and F)-rich cathode electrolyte interface film, which greatly suppresses the electrolyte-cathode side reactions and improves the stability of cathode. In addition, the electrophilicity of B atoms in TPFPB enhances 30 times of the solubility of LiNO3 in ester electrolyte to significantly improve the stability of Li metal anode. Thus, the Li||Ni-rich layered oxides full batteries using TPFPB show high stability and ultralong cycle life (up to 1500 cycles), which also present excellent performance even under high voltage (4.8 V), high areal mass loading (30 mg cm−2) and wide temperature range (−30∼60°C). The Li||LiNi0.9Co0.05Mn0.05O2 (NCM90) pouch cell using TPFPB with a capacity of 3.1 Ah reaches a high energy density of 420 Wh kg−1 at 0.1 C and presents outstanding cycling performance.

中文翻译：

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通过优先吸附基于硼酸盐的电解质添加剂的新型阴极界面形成方法


高容量阴极和锂金属阳极的结合有望成为下一代高能量密度电池。然而，阴极和阳极的快速结构退化挑战了它们的实际应用。在此，我们合成了一种用于超稳定锂（Li）金属||富镍层状氧化物电池的电解质添加剂三（2,2,3,3,3-五氟丙基）硼烷（TPFPB）。它能优先吸附在正极表面，形成稳定的富含B和F的正极电解质界面膜，极大地抑制了电解质与正极的副反应，提高了正极的稳定性。此外，TPFPB中B原子的亲电性使LiNO3在酯电解液中的溶解度提高了30倍，显着提高了锂金属负极的稳定性。因此，使用TPFPB的富Li||Ni层状氧化物全电池表现出高稳定性和超长循环寿命（高达1500次循环），即使在高电压（4.8 V）、高面积质量负载（30 mg）下也表现出优异的性能。 cm−2) 和宽温度范围 (−30∼60°C)。使用容量为3.1 Ah的TPFPB的Li||LiNi0.9Co0.05Mn0.05O2 (NCM90)软包电池在0.1 C下达到420 Wh kg−1的高能量密度，并表现出出色的循环性能。