Transparent Thin Film Solid-State Lithium Ion Batteries

Abstract

Transparent electrochemical energy storage devices have attracted extensive attention for the power supply of next-generation transparent electronics. In this paper, semitransparent thin film batteries (TFBs) with a grid-structured design have been fabricated on glass substrates using specific photolithography and etching processes to achieve LiCoO 2 / LiPON/Si structures below human eye resolution. UV−vis transmittances up to 60% have been measured for the obtained TFBs. A discharge capacity as high as 0.15 mAh has been recorded upon galvanostatic cycling at the C/2 rate within 4.2−3 V voltage range for the highest transmittances. The capacity variation trend exhibits an initial phase of a gradual decrease with an average capacity loss of 0.15% per cycle and thereafter a second phase with almost stable capacity. Particular attention has been given to the effects of architecture parameters on the TFB optical and electrochemical properties. To the best of our knowledge, this work is the first demonstration of transparent, all inorganic, thin film lithium ion batteries. While reported studies are limited to battery structures involving liquid or polymer materials, our devices will contribute to improve form factor freedom, extend operating ranges, enhance long-term stability, and will be relevant to the integration into various optoelectronic devices.

Sputtered Porous Li-Fe-P-O Film Cathodes Prepared by Radio Frequency Sputtering for Li-ion Microbatteries

“…Also, Oukassi et al . 30 deposited transparent thin film batteries layers using RF sputtering, a discharge capacity of 0.15 mAh at C/2 rate with an average capacity loss of solely 0.15% per cycle can be obtained.…”

Multifunctional Batteries: Flexible, Transient, and Transparent

“…LiCoO 2 /lithium phosphorus oxynitride (LiPON)/Si structures were fabricated on glass substrates using photolithography and etching processes to achieve a transmittance of 60% with 65.3% of open area (Figure 5g). 139 Yang et al used a microfluidics-assisted method to process Li 4 Ti 5 O 12 and LiMn 2 O 4 into grid-structured electrodes for a transparent LIB. A transmittance of 62% in the visible and near-infrared range for the electrode was obtained (Figure 5h−k).…”

“…The grid-structure approach was used for fabricating thin-film electrodes in a transparent, all-solid inorganic LIB. LiCoO 2 /lithium phosphorus oxynitride (LiPON)/Si structures were fabricated on glass substrates using photolithography and etching processes to achieve a transmittance of 60% with 65.3% of open area (Figure g) . Yang et al used a microfluidics-assisted method to process Li 4 Ti 5 O 12 and LiMn 2 O 4 into grid-structured electrodes for a transparent LIB.…”

“…(g) Thin-film battery with a grid-structured design of LiCoO 2 /LiPON/Si on glass substrates. Used with permission from ref . Copyright 2019 American Chemical Society.…”

Graphene's Role in Emerging Trends of Capacitive Energy Storage

“…As optical transparent transistors, sensors, organic light-emitting diodes and a large group of electronic components become commercially available, transparent power sources and energy storage devices are the next milestones. [121][122][123][124] Optically transparent supercapacitors require both optical transparency to visible light and high conductivity often even under severe strain. These devices are designed to power optoelectronic devices such as liquid crystal displays, touch screens, and store energy from photovoltaics.…”