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A new approach to both high safety and high performance of lithium-ion batteries

Shanhai GeElectrochemical Engine Center and Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USAYongjun LengElectrochemical Engine Center and Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USATeng LiuElectrochemical Engine Center and Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USARyan S. LongchampsElectrochemical Engine Center and Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USAXiaoguang YangElectrochemical Engine Center and Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USAYue GaoElectrochemical Engine Center and Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USADaiwei WangElectrochemical Engine Center and Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USADonghai WangElectrochemical Engine Center and Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USAChao‐Yang WangElectrochemical Engine Center and Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USA

2020en

ABI

Annotatsiya

We present a novel concept to achieve high performance and high safety simultaneously by passivating a Li-ion cell and then self-heating before use. By adding a small amount of triallyl phosphate in conventional electrolytes, we show that resistances of the passivated cells can increase by ~5×, thereby ensuring high safety and thermal stability. High power before battery operation is delivered by self-heating to an elevated temperature such as 60°C within tens of seconds. The present approach of building a resistive cell with highly stable materials and then delivering high power on demand through rapid thermal stimulation leads to a revolutionary route to high safety when batteries are not in use and high battery performance upon operation.

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Identifikatorlar

DOI: 10.1126/sciadv.aay7633

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