用于可充电锂离子电池的先进普鲁士蓝阴极

Solids Pub Date : 2024-04-16 DOI:10.3390/solids5020014
Shun-Ji Wu, Wen‐Hsien Li, Erdembayalag Batsaikhan, Ma-Hsuan Ma, Chunyuan Yang
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引用次数: 0

摘要

利用金属纳米粒子(NPs)的表面电子即使在低电压偏置下也能有效释放这一事实,我们证明了通过在工作的普鲁士蓝(PB)NPs 附近加入裸银或裸镍 NPs,可以改善基于纳米普鲁士蓝(PB)的二次电池的电化学性能。研究发现,17 nm PB 电池的电化学储能容量明显高于 10 nm PB、35 nm PB 或 46 nm PB 电池。要获得最高的电化学储能效率,存在一个临界 PB 尺寸。在 IW = 0.03 mA 的工作电流下,基于 17 纳米 PB 的电池经过 130 次充放电循环后,其全比容量 CF 稳定在 62 mAh/g。在 PB NPs 附近添加 14 质量百分数的 Ag NPs 使稳定的 CF 增加了 32%。在 35 纳米 PB 电池的工作电极上添加 14 质量百分数的银氧化物,可使稳定的 CF 增加 42%。加入裸镍氮氧化物的电极也能提高电池的CF,但效果较小。
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Advanced Prussian Blue Cathodes for Rechargeable Li-Ion Batteries
Taking advantage of fact that the surface electrons of metallic nanoparticles (NPs) can be effectively released even at a low voltage bias, we demonstrate an improvement in the electrochemical performance of nanosized Prussian Blue (PB)-based secondary batteries through the incorporation of bare Ag or Ni NPs in the vicinity of the working PB NPs. It is found that the capacity for electrochemical energy storage of the 17 nm PB-based battery is significantly higher than the capacity of 10 nm PB-based, 35 nm PB-based or 46 nm PB-based batteries. There is a critical PB size for the highest electrochemical energy storage efficiency. The full specific capacity CF of the 17 nm PB-based battery stabilized to 62 mAh/g after 130 charge–discharge cycles at a working current of IW = 0.03 mA. The addition of 14 mass percent of Ag NPs in the vicinity of the PB NPs gave rise to a 32% increase in the stabilized CF. A 42% increase in the stabilized CF could be obtained with the addition of 14 mass percent of Ag NPs on the working electrode of the 35 nm PB-based battery. An enhancement in CF was also found for electrodes incorporating bare Ni NPs but the effect was smaller.
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