Dry-processed cathode with Li+-carrier composite binder fiber for high energy density lithium-ion battery

材料科学 复合材料 复合数 能量密度 电池(电) 纤维 锂(药物) 阴极 锂离子电池 离子 工程物理 电气工程 医学 功率(物理) 物理 量子力学 工程类 内分泌学
作者
Fengqian Wang,Qigao Han,Yaqing Guo,Shuaijing Ji,Junwei Wang,K. Li,Li Tian,Shun Tang,Weixin Zhang,Shijie Cheng,Yuan‐Cheng Cao
出处
期刊:Composites Part B-engineering [Elsevier BV]
卷期号:302: 112541-112541 被引量:7
标识
DOI:10.1016/j.compositesb.2025.112541
摘要

The application of high energy density battery presents challenges for high loading electrode to achieve good performance. Polytetrafluoroethylene fibrillation results in unique advantages including high tap density, non-pollution, and thick electrodes. However, with an increase in electrode thickness, Li + transport within a dry cathode with a low porosity is particularly limited. Additionally, the binder currently used in the dry-film process suffers from poor conductivity and viscosity , resulting in a lithium-ion battery with poor cycling stability and rate performance. In this study, we developed a dry ultra-high-loading cathode using a Li + -carrier composite binder , which facilitated Li + migration and ensured good interfacial contact between the active material particles (LiNi 0.5 Co 0.2 Mn 0.3 O 2 ). This was attributed to the high dispersion performance of polyacrylonitrile and its interactions with Li + . Density functional theory analysis revealed that the composite binder exhibited a homogeneous electrostatic potential profile and narrow lowest unoccupied molecular orbital-highest occupied molecular orbital energy gap, thus enhancing its effectiveness in facilitating electron mobility . Therefore, the thick cathode fabricated with the composite binder displayed a high discharge capacity of 170.4 mAh g −1 (200 μm, 9 mAh cm −2 ) at 0.1C and a stable cycling performance, retaining 80.8 % of its initial capacity after 250 cycles at 0.5C. The single-layer lithium-metal pouch cell exhibited a high energy density of 300 Wh kg −1 , and 85.5 % of the capacity was retained after 150 cycles at 0.1C. The cell coupled with high loading (∼200 μm, 53.8 mg cm −2 ) of dry thick cathode electrodes fabricated with Li + -carrier composite binder is successfully prepared. With only single layer cathodes required, the theoretical energy density of the pouch cell can reach 300 Wh kg −1 . The performance enhancement mechanism should be attribute to the introduced PAN, leading to more Li + movements. • Ultra-high loading cathode (∼200 μm, 53.8 mg cm −2 ) are successfully prepared. • The introduced PAN could remarkably modify the electrochemical performance of dry electrode. • In fibrous structure, the introduced PAN can improve homogeneity and facilitate Li + transport. • The method is easy to prepare on a large scale, single-layer pouch cell can provide a high energy density of 300 Wh kg −1 .
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