Micro-stress pump with stress variation to boost ion transport for high-performance sodium-ion batteries,Energy & Environmental Science

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Micro-stress pump with stress variation to boost ion transport for high-performance sodium-ion batteries
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2024-07-10 , DOI: 10.1039/d4ee00282b
Xin Jin ₁ , Mengfan Pei ₁ , Dongming Liu ₁ , Zihui Song ₁ , Wanyuan Jiang ₁ , Runyue Mao ₁ , Borui Li ₁ , Xigao Jian _{1,

2} , Fangyuan Hu ₁

Affiliation

Sluggish kinetics limit the practical application of sodium-ion batteries (SIBs); thus, innovative strategies and the design of materials with fast reaction kinetics are important for the development of SIBs. To solve these issues, the innovative strategy of using a micro-stress pump to boost Na⁺ transport by simulating rhythmic cardiac blood pumping has proposed for the first time. A smart material with cardiac-like behavior promotes the electrochemical kinetics through the self-regulation of stress under the variation of voltage in the redox reaction. Under the micro-stress field, a half-cell demonstrates a capacity of 119.1 mA h g⁻¹ at 35 A g⁻¹, and a 1.04 A h pouch cell shows an excellent energy density of 317.2 W h kg⁻¹ (the retention is 90.2% after 500 cycles at 1C). Via further analysis of physicochemical characterizations and the sensor signal, the signal correlation of the mechanism between electrochemistry and stress was obtained. This work provides a strategy for accelerating the transmission rate of Na⁺ based on a stress field.

中文翻译：

具有应力变化的微应力泵可促进高性能钠离子电池的离子传输

缓慢的动力学限制了钠离子电池（SIB）的实际应用；因此，创新策略和具有快速反应动力学的材料设计对于SIB的发展非常重要。为了解决这些问题，首次提出了使用微应力泵通过模拟节律性心脏血液泵送来促进Na ⁺ 运输的创新策略。具有类似心脏行为的智能材料通过氧化还原反应中电压变化下的应力自我调节来促进电化学动力学。在微应力场下，半电池在 35 A g ⁻¹ 下表现出 119.1 mAh g ⁻¹ 的容量，1.04 A h 软包电池表现出优异的能量密度317.2 Wh kg ⁻¹ （1C下500次循环后保留率为90.2%）。通过对物理化学特性和传感器信号的进一步分析，获得了电化学与应力之间机制的信号相关性。这项工作提供了一种基于应力场加速Na ⁺ 传输速率的策略。

更新日期：2024-07-10

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