General Airbrush‐Spraying/Electrospinning Strategy for Ultrahigh Areal‐Capacity LiFePO₄‐Based Cathodes

Abstract

A versatile electrode fabrication strategy based on electrospinning combined with airbrush–spraying (ECAS) is developed for the preparation of composite paper electrodes. The LiFePO4 paper electrodes (ca. 13 mg cm−2) display good cycling stability with a capacity decay of only 15 % over 300 cycles at 1 C for lithium‐ion batteries. It is also demonstrated that the ECAS technique can obtain ultrahigh areal capacities of 12.3 mAh cm−2 using electrodes with an extra‐high areal loading of LiFePO4 paper (>75 mg cm−2). A full cell is constructed with ECAS LiFePO4 paper as the cathode and ECAS Li4Ti5O12 paper as the anode.

Rational Design of High‐Loading Electrodes with Superior Performances Toward Practical Application for Energy Storage Devices

“…The LFP electrodes (13 mg cm −2 ) exhibited a charge/discharge capacity of ≈120 mAh g −1 and remarkable cycling stability with capacity decay of only 15% over 300 cycles at 1 C. Even at cathode mass loading exceeding 75 mg cm −2 , the volumetric and areal capacities reached up to 210 and 12.3 mAh cm −2 , respectively. [222] Furthermore, different from the traditional slurry-based method, Yao et al fabricated a high-loading LNMO electrode using PTFE binder based on a dry coating process. In this method, PTFE particles were sheared to form viscous fibrils; thus, closely combining conductive carbon and active materials (Figure 10a).…”

Li2SiO3 Modification of C/LiFe0.5Mn0.5PO4 for High Performance Lithium‐Ion Batteries

“…Since 1997, The olivine-structured LiFePO 4 receives considerable attention from researchers for its high safety and stability. [4][5][6] In recent years, researchers replaced part of the Fe in LiFePO 4 with Mn to increase the energy density, obtaining a low-cost, green and highly energy density LiFe 1-x Mn x PO 4 . [7] However, the LiFe 1-x Mn x PO 4 exhibits an intrinsically low electronic conductivity (10 À 9 -10 À 10 S cm À 1 ) and a low ion diffusion coefficient (10 À 14 -10 À 16 cm 2 s À 1 ).…”

“…Moreover, the cathode material is essential to the further development of LIBs. Since 1997, The olivine‐structured LiFePO 4 receives considerable attention from researchers for its high safety and stability [4–6] . In recent years, researchers replaced part of the Fe in LiFePO 4 with Mn to increase the energy density, obtaining a low‐cost, green and highly energy density LiFe 1‐x Mn x PO 4 [7] .…”

Constructing Gradient Porous Structure in Thick Li4Ti5O12 Electrode for High-Energy and Stable Lithium-Ion Batteries

“…Nowadays, lithium-ion batteries (LIBs) have been so popular in our life that they can be found almost everywhere, for example, in consumer electronics, electric vehicle (EV) and grid-scale energy storage systems (ESSs). − The growing demand for LIBs has attracted significant attention in the EV market. In order to catch up with the rapid development of the EV market, the development of high-energy density of LIBs is in urgent need. − Increasing the thickness of an electrode in manufacturing is an important approach to increase energy density of LIBs. − Researchers have discovered various on a thick electrode. For example, T. Danner simulated the electrochemical performance of thick NCM and graphite electrodes through 1 + 1D and 3D models .…”