Lithium-ion batteries (LIB) are extensively utilized across industries for their rechargeable nature, but capacity degradation during charge/discharge cycling poses the risk of battery failure. The LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) cathode material encounters challenges in maintaining high capacity and cycling performance due to cation mixing, ion migration, and electrolyte chemical reactions. While the conventional inorganic coating layer offers some physical protection, it is susceptible to detachment. We introduce organic poly(acrylic acid) (PAA) and adhesive polyvinylidene fluoride (PVDF) cross-linked to form a composite cross-linked adhesive. The combination of PAA and PVDF improves the viscosity of the adhesive and enhances the bonding strength of the cathode material. The C=O group in PAA forms coordination bonds with transition metals, creating a coordinated anchoring effect that enhances the stability of the cathode structure. The reversible ion exchange between H⁺ of −COOH and Li⁺ promotes lithium-ion transport at the electrode interface, enhancing electrochemical performance. After 200 cycles, the capacity retention under 1C conditions reached 90.20%.

中文翻译：

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PAA/PVDF 交联粘合剂的配体锚定效应促进正极材料的界面稳定性和电化学性能


锂离子电池 （LIB） 因其可充电特性而在各行各业中得到广泛应用，但充放电循环过程中的容量下降会带来电池故障的风险。LiNi_0.8Co_0.1Mn_0.1O₂ （NCM811） 正极材料由于阳离子混合、离子迁移和电解质化学反应，在保持高容量和循环性能方面遇到了挑战。虽然传统的无机涂层提供了一些物理保护，但它很容易脱落。我们引入有机聚丙烯酸 （PAA） 和胶粘剂聚偏二氟乙烯 （PVDF） 交联，形成复合交联胶粘剂。PAA 和 PVDF 的结合提高了胶粘剂的粘度，并增强了正极材料的粘合强度。PAA 中的 C=O 基团与过渡金属形成配位键，产生配位锚定效应，增强阴极结构的稳定性。−COOH 的 H⁺ 和 Li⁺ 之间的可逆离子交换促进了电极界面处的锂离子传输，从而提高了电化学性能。经过 200 次循环后，1C 条件下的容量保持率达到 90.20%。