Ligand-Anchoring Effect of a PAA/PVDF-Cross-Linked Binder Promoting Interfacial Stability and Electrochemical Performance of a Cathode Material

IF 3.8 3区工程技术 Q2 ENGINEERING, CHEMICAL

Industrial & Engineering Chemistry Research Pub Date : 2024-12-17 DOI:10.1021/acs.iecr.4c02904

Wenjing Shi, Songyuchen Ma, Ye Song, Jie Liu

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Abstract

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%.

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PAA/ pvdf交联粘合剂的配体锚定效应对正极材料界面稳定性和电化学性能的影响

锂离子电池（LIB）因其可充电特性被广泛应用于各行业，但在充放电循环过程中容量下降会带来电池故障的风险。LiNi0.8Co0.1Mn0.1O2 （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面临挑战。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）与粘合剂聚偏氟乙烯（PVDF）交联，形成复合交联粘合剂。PAA与PVDF的结合提高了胶粘剂的粘度，增强了正极材料的结合强度。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，增强了阴极结构的稳定性。−COOH的H+与Li+之间的可逆离子交换促进了锂离子在电极界面的输运，提高了电化学性能。循环200次后，1C条件下的容量保留率达到90.20%。

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来源期刊

Industrial & Engineering Chemistry Research 工程技术-工程：化工

CiteScore

7.40

自引率

7.10%

发文量

1467

审稿时长

2.8 months

期刊介绍： ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.