Nickel (Ni)-rich LiNi_xCo_yMn_zO₂ (NCM, x ≥ 0.9) cathode materials are gaining widespread attention owing to their higher energy density than conventional cathodes, such as LiCoO₂ and LiFePO₄. Unfortunately, the industrial application of Ni-rich NCM materials is still restrained by the unsatisfactory electrochemical properties resulting from the unstable cathode structure and the cathode/electrolyte interface. Here, we propose an electrolyte additive, cis-1,2,3,6-tetrahydrophthalic anhydride (THPA) to enhance the interfacial stability of the Ni-rich LiNi_0.90Co_0.05Mn_0.05O₂ (NCM90) cathode. It is demonstrated that additive THPA is more preferable to be oxidized at the cathode as well as to be reduced at the anode, hindering the unwanted oxidation of carbonate solvents. An integrated and compact cathode electrolyte interphase (CEI) film is generated in the presence of a 2.0% THPA additive, mitigating the parasitic interfacial reactions, suppressing the buildup of interfacial resistance, and somewhat inhibiting the intragranular cracks. Consequently, the capacity retention of NCM90 with an electrolyte containing 2.0% THPA is boosted to 93.2% after 120 cycles at 1C (1C = 180 mA g^–1) at 30 °C, well exceeding 80.0% obtained with the baseline electrolyte.

中文翻译：

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电解质添加剂cis-1,2,3,6-四氢邻苯二甲酸酐提高富镍LiNi0.9Co0.05Mn0.05O2的循环寿命

富含镍 (Ni) 的 LiNi _x Co _y Mn _z O ₂ (NCM, x ≥ 0.9) 正极材料因其比传统正极（如 LiCoO ₂和 LiFePO _{4 ）}更高的能量密度而受到广泛关注。不幸的是，由于阴极结构不稳定和阴极/电解质界面导致电化学性能不理想，富镍 NCM 材料的工业应用仍然受到限制。在这里，我们提出了一种电解质添加剂顺式-1,2,3,6-四氢邻苯二甲酸酐 (THPA) 来增强富镍 LiNi _0.90 Co _0.05 Mn _0.05的界面稳定性O ₂ (NCM90) 阴极。结果表明，添加剂 THPA 更优选在阴极被氧化以及在阳极被还原，从而阻止了碳酸盐溶剂的不必要氧化。在 2.0% THPA 添加剂的存在下，会生成一个集成且致密的阴极电解质界面 (CEI) 膜，减轻寄生界面反应，抑制界面电阻的积累，并在一定程度上抑制晶内裂纹。因此，在 1C (1C = 180 mA g ^–1 ) 和 30 °C 条件下，使用含有 2.0% THPA 的电解液的 NCM90 的容量保持率提高至 93.2% ，远远超过使用基线电解液获得的 80.0%。