Flexible High-Energy Li-Ion Batteries with Fast-Charging Capability

Abstract

With the development of flexible mobile devices, flexible Li-ion batteries have naturally received much attention. Previously, all reported flexible components have had shortcomings related to power and energy performance. In this research, in order to overcome these problems while maintaining the flexibility, honeycomb-patterned Cu and Al materials were used as current collectors to achieve maximum adhesion in the electrodes. In addition, to increase the energy and power multishelled LiNi0.75Co0.11Mn0.14O2 particles consisting of nanoscale V2O5 and LixV2O5 coating layers and a LiδNi0.75-zCo0.11Mn0.14VzO2 doping layer were used as the cathode-anode composite (denoted as PNG-AES) consisting of amorphous Si nanoparticles (<20 nm) loaded on expanded graphite (10 wt %) and natural graphite (85 wt %). Li-ion cells with these three elements (cathode, anode, and current collector) exhibited excellent power and energy performance along with stable cycling stability up to 200 cycles in an in situ bending test.

Nickel‐Rich Layered Lithium Transition‐Metal Oxide for High‐Energy Lithium‐Ion Batteries

“…Schematic representation of a multi-shell coated Ni-rich cathode material and its coating effect. [88] a) The V 2 O 5 modified LiNi 0.75 Co 0.11 Mn 0.14 O 2 cathode material with multi-shell surface structure; b) Cross-sectional TEM image of the V 2 O 5 coated Ni-rich cathode material, and corresponding EELS spectra of the distribution of V and Ni. c) XPS spectra of bare (BNCM) and V 2 O 5 -coated (VNCM) Ni-rich cathode material, which demonstrates consumption of surface lithium species.…”

Multifunctional modification of Li[Ni0.5Co0.2Mn0.3]O2 with NH4VO3 as a high performance cathode material for lithium ion batteries

“…During the storage process of the materials, the residual lithium can react with moisture and CO 2 from the air, thus forming LiOH and Li 2 CO 3 [28]. For these reasons, the residual lithium impurities can increase the pH value of the cathode powders and accelerate the gelation of the cathode slurry in N-methyl-2-pyrrolidone (NMP) [29]. Even worse, such residual impurities result in the formation of Li 2 O and HF during operation at high voltage, which drastically hinder the lithium ion diffusivity, reduce the charge transfer reactions at the interface, leading to a decline of battery performance [30][31][32][33].…”

“…Even worse, such residual impurities result in the formation of Li 2 O and HF during operation at high voltage, which drastically hinder the lithium ion diffusivity, reduce the charge transfer reactions at the interface, leading to a decline of battery performance [30][31][32][33]. In addition, Li 2 CO 3 has been proved to be a main source of CO 2 which brings security issues [29,34]. On this account, these residues are not expected for a well-performed cathode material.…”

“…Recently, vanadium modified cathode materials have been widely studied [25,29,[35][36][37][38][39][40]. Zhu et al [25] reported that suitable vanadium substitution leaded to low cation mixing for Li [ …”

Current Collectors for Flexible Lithium Ion Batteries: A Review of Materials

“…The 3D surface of the current collector enabled improved adhesion by increased surface area. A pouch cell was tested under a bending speed of 30 mm/min under 11.0 N during charge and discharge cycles at 4 C [35]. Our group has reported a thin (<1 µm) metal layer sputtered onto the porous polymeric membrane, which is generally used as a separator material.…”