English

High Performance Solid-state Battery with Integrated Cathode and Electrolyte

• JIN Feng ^1,2, ,
• LI Jing ^2, ,
• HU Chenji ^2,3, ,
• DONG Houcai ^2, ,
• CHEN Peng ^2, ,
• SHEN Yanbin ^{2, ,} ,
• CHEN Liwei ^{2,3, ,}

• 1.

  School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, P. R. China

• 2.

  i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, Jiangsu Province, P. R. China

• 3.

  School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China

Corresponding author: SHEN Yanbin, ybshen2017@sinano.ac.cn CHEN Liwei, lwchen2008@sinano.ac.cn

• Received Date: 25 April 2019
  Accepted Date: 24 May 2019
  Revised Date: 23 May 2019
  Available Online: 15 December 2019
• Fund Project:

  The project was supported by the National Natural Science Foundation of China (21625304, 21733012, 21773290), the "Strategic Priority Research Program" of CAS (XDA09010600), and the Ministry of Science and Technology of China (2016YFA0200703)

Abstract: Lithium ion batteries (LIBs) are becoming the most popular energy storage systems in our society. However, frequently occurring accidents of electrical cars powered by LIBs have caused increased safety concern regarding LIBs. Solid-state lithium batteries (SSLBs) are believed to be the most promising next generation energy storage system due to their better in-built safety mechanisms than LIBs using flammable organic liquid electrolyte. However, constructing the ionic conducting path in SSLBs is challenging due to the slow ionic diffusion of Li ion in solid-state electrolyte, particularly in the case of solid-solid contact between the solid materials. In this paper, we demonstrate the construction of an integrated electrolyte and cathode for use in SSLBs. An integrated electrolyte and cathode membrane is obtained via simultaneous electrospinning and electrospraying of a polyacrylonitrile (PAN) electrolyte and a LiFePO₄ (LFP) cathode material respectively, for the cathode layer, followed by the electrospinning of PAN to prepare the electrolyte layer. The resultant integrated PAN-LFP membrane is flexible. Scanning electron microscopy and energy dispersive X-ray spectroscopy measurement results show that the electrode and electrolyte are in close contact with each other. After the integrated PAN-LFP membrane is filled with a succinonitrile-bistrifluoromethanesulfonimide (SN-LiTFSI) salt mixture, it is paired with a lithium foil metal anode electrode, and the resultant solid-state Li|PAN-LFP cell exhibits limited polarization and outstanding interfacial stability during long term cycling. That is, the Li|PAN-LFP cell presents a specific capacity of 160.8 mAh∙g⁻¹ at 0.1C, and 81% of the initial capacity is maintained after 500 cycles at 0.2C. The solid-state Li|PAN-LFP cell also exhibits excellent resilience in destructive tests such as cell bending and cutting.

Key words:
• Solid-state lithium battery
•  /  Interface
•  /  Integrated electrolyte and cathode membrane
•  /  Electrospinning
•  /  Electrospraying

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