Zhuo Huanming, Zhao Shuangshuang, Xu Ruijie, Zhou Lu, Li Ye, Peng Yuehuan, Rao Xuelong, Tao Yuqiang, Ou Xing
School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China.
School of Metallurgy and Environment, Central South University, Changsha 410083, China.
Nanomaterials (Basel). 2025 Jul 24;15(15):1144. doi: 10.3390/nano15151144.
Surface microstructure of grains vastly decides the electrochemical performance of nickel-rich oxide cathodes, which can improve their interfacial kinetics and structural stability to realize their further popularization. Herein, taking the representative LiNiCoAlO (NCA) materials as an example, a surface heterojunction structure construction strategy to enhance the interface characteristics of high-nickel materials by introducing interfacial ZnO sites has been designed (NCA@ZnO). Impressively, this heterointerface creates a strong built-in electric field, which significantly improves electron/Li-ion diffusion kinetics. Concurrently, the ZnO layer acts as an effective physical barrier against electrolyte corrosion, notably suppressing interfacial parasitic reactions and ultimately optimizing the structure stability of NCA@ZnO. Benefiting from synchronous optimization of interface stability and kinetics, NCA@ZnO exhibits advanced cycling performance with the capacity retention of 83.7% after 160 cycles at a superhigh rate of 3 C during 3.0-4.5 V. The prominent electrochemical performance effectively confirms that the surface structure design provides a critical approach toward obtaining high-performance cathode materials with enhanced long-cycling stability.
颗粒的表面微观结构在很大程度上决定了富镍氧化物阴极的电化学性能，这可以改善其界面动力学和结构稳定性，以实现其进一步的推广应用。在此，以具有代表性的LiNiCoAlO（NCA）材料为例，设计了一种通过引入界面ZnO位点来增强高镍材料界面特性的表面异质结结构构建策略（NCA@ZnO）。令人印象深刻的是，这种异质界面产生了强大的内建电场，显著改善了电子/锂离子扩散动力学。同时，ZnO层作为一种有效的物理屏障，可防止电解质腐蚀，显著抑制界面寄生反应，并最终优化NCA@ZnO的结构稳定性。得益于界面稳定性和动力学的同步优化，NCA@ZnO在3.0-4.5V的超高速率3C下循环160次后，容量保持率为83.7%，展现出优异的循环性能。卓越的电化学性能有效地证实了表面结构设计为获得具有增强的长循环稳定性的高性能阴极材料提供了一种关键方法。
