Vertically assembled nanosheet networks for high-density thick battery electrodes

Abstract

As one of the prevailing energy storage systems, lithium-ion batteries (LIBs) have become an essential pillar in electric vehicles (EVs) during the past decade, contributing significantly to a carbon-neutral future. However, the complete transition to electric vehicles requires LIBs with yet higher energy and power densities. Here, we propose an effective methodology via controlled nanosheet self-assembly to prepare low-tortuosity yet high-density and high-toughness thick electrodes. By introducing a delicate densification in a three-dimensionally interconnected nanosheet network to maintain its vertical architecture, facile electron and ion transports are enabled despite their high packing density. This dense and thick electrode is capable of delivering a high volumetric capacity >1,600 mAh cm −3 , with an areal capacity up to 32 mAh cm −2 , which is among the best reported in the literature. The high-performance electrodes with superior mechanical and electrochemical properties demonstrated in this work provide a potentially universal methodology in designing advanced battery electrodes with versatile anisotropic properties.

Amino-Acid-Substituted Perylene Diimide as the Organic Cathode Materials for Lithium-Ion Batteries

“…The fitted Nyquist plot and the equivalent circuit of PDI_A, V, and H from the EIS test are depicted in Figure 3 d. The fitted charge transfer resistance (R ct ) of the PDI_AAs cathode was (PDI_A: 338 Ω), (PDI_V: 376 Ω), and (PDI_H: 394 Ω), all of which were similar ( Table 3 ). To further investigate the conduction property of the PDI_AAs cathode, we calculated the diffusion coefficient of Li-ion (D Li ) with EIS data obtained through the previous reports [ 37 , 38 ]. The diffusion coefficient can be calculated from the diffusion length (l D ) and the diffusion time constant (τ D ), according to Equation (1): …”

High‐Sulfur Loading and Single Ion‐Selective Membranes for High‐Energy and Durable Decoupled Aqueous Batteries

“…The aligned channels extend from the top to the bottom of the electrode, which can act as a highly efficient "highway" of Cu 2+ . [44] With an areal sulfur loading of ≈5 mg cm −2 , the S@KB-MI electrode exhibits the through-plane electrical conductivity of 12.4 S m −1 (Figure 3c), which is about twice that of the randomly aligned electrode (5.9 S m −1 ) and four times that of the air-dried electrode (3.3 S m −1 ). Thereby although these electrodes consist of the same compositions, the distance required for electrons to go through the electrode is influenced by the conductive network connection.…”

Beyond electrode materials structure design: Binders play a vital role for battery application of micro-size electroactive materials

“…Micrometre-sized electroactive particles could effectively alleviate above mentioned concerns, owing to advantages of costeffective and high tapping density. Furthermore, maximizing the electrode areal capacity can improve the energy density, which can be realized by increasing mass loading through optimizing the electrode architecture using novel design concepts as well as using electroactive materials with high specific capacity [3][4][5]. Besides, manipulating the charge transport behaviour is important to maintain high energy density without comprising the power.…”