Li Qiang, Lin Jing, Shen Sicheng, Yang Meiqi, Chen Minfeng, Yang Ming, Wang Yanyi, Chen Jizhang, Mi Hongwei, He Chuanxin, Zhang Peixin, Ma Dingtao
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, P. R. China.
Small. 2025 Jun;21(25):e2500767. doi: 10.1002/smll.202500767. Epub 2025 Apr 27.
The accumulation of inactive by-products caused by the parasitic side reaction on cathode side is an overlooked question leading to performance degradation of zinc-ion batteries. In this research, taking the MnVO as a model, an amorphous carbon interphase is proposed as a pre-implanted cathode-electrolyte interphase (CEI) to design ultrafast-kinetics MnVO@C cathode. It is noted that such CEI integrates hydrophobic and conductive characteristics, contributing to dissolution shielding, continuous interfacial conductive channel, and thus preventing inactive by-product accumulation on the cathode interface. Unexpectedly, such electrode shows superior storage performance at a wide temperature range of -20-55 °C. It can deliver a specific capacity of 253.3 mAh g at the high current density of 10 A g even after 8000 cycles. Moreover, a high specific capacity of 393.8 mAh g (0.1 A g) can be retained after 300 cycles at 55 °C, as well as 205.1 mAh g at the condition of -20 °C and 5 A g. Beyond that, flexible solid-state zinc-ion batteries based on MnVO@C cathode with excellent wide temperature performance are demonstrated. This work highlights the importance of eliminating the dead by-product effect to design advanced cathode materials for zinc-ion batteries.
由阴极侧寄生副反应导致的无活性副产物积累是一个被忽视的问题，它会导致锌离子电池性能下降。在本研究中，以MnVO为模型，提出一种非晶碳界面层作为预植入的阴极-电解质界面（CEI），以设计超快动力学的MnVO@C阴极。值得注意的是，这种CEI兼具疏水性和导电性，有助于溶解屏蔽、形成连续的界面导电通道，从而防止无活性副产物在阴极界面上积累。出乎意料的是，这种电极在-20至55°C的宽温度范围内表现出优异的存储性能。即使在10 A g的高电流密度下循环8000次后，它仍能提供253.3 mAh g的比容量。此外，在55°C下循环300次后，可保持393.8 mAh g（0.1 A g）的高比容量，在-20°C和5 A g的条件下也能保持205.1 mAh g的比容量。除此之外，还展示了基于MnVO@C阴极的具有优异宽温度性能的柔性固态锌离子电池。这项工作突出了消除死副产物效应对于设计先进的锌离子电池阴极材料的重要性。
