Fluor-lithium salts have been found for the serious aluminum collector corrosion in lithium-ion batteries. Herein, we unexpectedly observe that adding 10 wt% fluor-lithium salts into Ni-rich cathode can lead to irreversible decay of the initial discharge capacity. The capacity loss is related to the surface phase corrosion of Ni-rich cathode materials, where the local nickel ions work as catalytic sites to induce the breakage of the C-F bond in fluor-lithium salts, promoting the decomposition of fluor-lithium salts under the driving force of external voltage exceeding 1.93 V. The formation of F− anion will attack Ni-rich cathode surface to produce nickel fluoride, resulting in the layered to rock-salt phase transformation. No corrosion behavior was found for iron, cobalt, and manganese of cathode materials. The synergistic activation by both nickel ions and voltage causes fluor-lithium salts to corrode the Ni-rich cathode materials.

中文翻译：

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氟锂盐对富镍正极材料的自致腐蚀


氟锂盐已被发现用于锂离子电池中严重的铝集流体腐蚀。在此，我们出乎意料地观察到，在富镍阴极中添加 10 wt% 的氟锂盐会导致初始放电容量的不可逆衰减。容量损失与富镍正极材料的表面相腐蚀有关，其中局部镍离子作为催化位点，诱导氟锂盐中 C-F 键断裂，在超过 1.93 V 的外部电压驱动下促进氟锂盐的分解。F−阴离子的形成会攻击富镍阴极表面产生氟化镍，导致层状到岩盐相变。未发现正极材料的铁、钴和锰的腐蚀行为。镍离子和电压的协同活化导致氟锂盐腐蚀富镍正极材料。