鋰離子電池(LIB) 的安全問題與熱失控和電池起火風險有關，本研究中, LiNi0.6Co0.2Mn0.2O2 (NCM622) 正極材料通過塗覆自封端的 BMI/CA (表示為 BC) 寡聚物 (N, N'-雙馬來酰亞胺-4,4'-二苯基甲烷 (BMI) 和氰尿酸 (CA)) 進行表面改性，以提高 LIB 的安全性和循環壽命。結果表明，在 25 和 55 °C 循環後，與原始 NCM622 相比, BC@NCM622 正極材料在高溫以及高倍率性能下表現出更高的放電容量和容量保持率。電化學阻抗譜的結果表明 BC@NCM622 電池具有較低的界面阻抗和電荷轉移阻抗，這意味著 CEI 層的積累和 NCM622 的結構變化已經減少。此外，鋰離子擴散係数越高，放電速率越高的 BC@NCM622 與不含添加劑的 NCM622 相比，由於活性材料上 BC 層的覆盖，抑制了NCM 與電解液的直接相互作用，因此結構變化和/或電極表面上不希望發生的電解液分解反應得到了缓解。此外，還進行了SEM – EDX 和 XPS，以檢查含添加劑以及無添加劑的樣品表面、循環前後以及循環電極的 CEI 組成。最後，還檢測了表面改性 NCM622 正極材料的熱穩定性能，包括 TGA, 55 °C 下的儲存穩定性和 150 °C 下的加熱測試。

The safety concern associated with the risk of thermal runaway and battery fire is known to be a pivotal issue of lithium-ion batteries (LIBs). In this work, LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode materials were surface-modified by coating with self-terminated BMI/CA (so-called BC) oligomers (N, N′-bismaleimide-4,4′-diphenylmethane (BMI) with cyanuric acid (CA)) for enhancing the safety and cycle life of LIBs. The findings showed that after cycling at 25 and 55 oC, compared with the pristine NCM622, the BC@NCM622 cathodes exhibited a higher discharge capacity and capacity retention, especially at high temperature, and better C-rate performance. Additionally, the EIS results present that the BC@NCM622 cells had a lower interfacial and charge transfer impedance implying that the accumulation of CEI layer and structural change of NCM622 have been reduced. Moreover, the higher Li+ diffusion coefficients at a higher discharge rate of BC@NCM622 in comparison with the NCM622 without additives could be explained by the mitigation of structural change and/or the undesired electrolyte decomposition reaction on the electrode surface owing to the coverage of the BC layer over the active materials that inhibit the direct interaction of NCM with the electrolyte. Furthermore, the SEM-EDX and XPS were also conducted to examine the surface of samples with and without additive, before and after cycling, and the CEI composition of cycled electrodes. Besides, thermal properties, including TGA, storage stability at 55 oC, and heating test at 150 oC, of the surface-modified NCM622 cathodes were examined.

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