Biobased Self-Growing Approach toward Tailored, Integrated High-Performance Flexible Lithium-Ion Battery

Abstract

Here we present an innovative, universal, scalable, and straightforward strategy for cultivating a resilient, flexible lithium-ion battery (LIB) based on the bacterial-based self-growing approach. The electrodes and separator layers are integrated intrinsically into one unity of sandwich bacterial cellulose integrated film (SBCIF), with various active material combinations and tailored mechanical properties. The flexible LIB thereof showcases prominent deformation tolerance and multistage foldability due to the unique self-generated wavy-like structure. The LTO|LFP (Li4Ti5O12 and LiFePO4) SBCIF-based flexible LIB demonstrates reliable long-term electrochemical stability with high flexibility, by exhibiting a high capacity retention (>95%) after 500 cycles at 1C/1C after experiencing a 10 000 bending/flattening treatment. The LTO|LFP SBCIF battery subjected to a simultaneous bending/flattening and cycling experiment shows an extraordinary capacity retention rate (>68%) after 200 cycles at 1C/1C. The biobased self-growing approach offers an exciting and promising pathway toward the tailored, integrated high-performance flexible LIBs.

Flexible electrochemical energy storage devices and related applications: recent progress and challenges

“…Furthermore, these collectors demonstrate electrochemical compatibility with a wide range of mainstream LIB cathodes and anodes. Deng et al 180 proposed a simple and versatile bio-self-growth strategy for the preparation of flexible LIBs ( Fig. 18j ), in which the electrodes and the diaphragm (SBCIF) are essentially integrated into a single whole, capable of adapting to various active materials.…”

Flexible Solid-State Lithium-Ion Batteries: Materials and Structures

“…This structure is similar to a sandwich and is the most widely used battery structure. This structure has received a lot of research [123][124][125]. Koo et al [103] developed a UFLIB by using a generic transfer method (Figure 14a).…”