Chemical Coupled PEDOT:PSS/Si Electrode: Suppressed Electrolyte Consumption Enables Long-Term Stability

Abstract

Huge volume changes of Si during lithiation/delithiation lead to regeneration of solid-electrolyte interphase (SEI) and consume electrolyte. In this article, γ-glycidoxypropyl trimethoxysilane (GOPS) was incorporated in Si/PEDOT:PSS electrodes to construct a flexible and conductive artificial SEI, effectively suppressing the consumption of electrolyte. The optimized electrode can maintain 1000 mAh g−1 for nearly 800 cycles under limited electrolyte compared with 40 cycles of the electrodes without GOPS. Also, the optimized electrode exhibits excellent rate capability. The use of GOPS greatly improves the interface compatibility between Si and PEDOT:PSS. XPS Ar+ etching depth analysis proved that the addition of GOPS is conducive to forming a more stable SEI. A full battery assembled with NCM 523 cathode delivers a high energy density of 520 Wh kg−1, offering good stability.

Porous Co2VO4 Nanodisk as a High-Energy and Fast-Charging Anode for Lithium-Ion Batteries

“…Besides graphite and Li 4 Ti 5 O 12 , Si is also a commercially available LIBs anode. Si possesses an ultrahigh theoretical capacity (4200 mAh g −1 ) and a low, yet safe lithiation potential (~ 0.22 V vs. Li + /Li), holding great promise in safe and high-energy anodes for LIBs [ 13 , 14 ]. However, its fast-charging performance deteriorates because of the enormous volume change (~ 400%) and low Li + diffusion coefficient (4.60 × 10 –14 cm 2 s −1 ) during cycling [ 15 ].…”

Multiprocess Laser Lifting‐Off for Nanostructured Semiconductive Hydrogels

“…As was known, [ 33–35 ] the stored charge originated from the fast surface redox reactions of PEDOT, NSICs held higher pseudo capacitance density than electrochemical ones constrained at the limited smooth surface. Porous morphologies of the hydrogel network (Figures 2a and 3a) provided abundant channels and huge volume for electrolyte diffusion to facilitate energy‐store responsiveness.…”

“…Volume reduction and shaping ability of fs‐LLO extend the capability of NSICs to on‐chip integrate with peripheral circuits or nanogenerators [ 35,36 ] to harvest energy, or to protect vulnerable electrical chips from volt overloading, or to supply power. Manipulative electrode geometries (the square‐shaped and ring‐shaped electrodes with tunable interspacing in Figure 3b,c, and Videos S1 and S2, Supporting Information) became real (Figure 4a,b) due to the flexible laser parameters (Table S2, Supporting Information).…”

Calcination‐Free Synthesis of Well‐Dispersed and Sub‐10 nm Spinel Ferrite Nanoparticles as High‐Performance Anode Materials for Lithium‐Ion Batteries: A Case Study of CoFe2O4

“…The formation of SEI film brought side reactions and consumed lithium ions, leading to capacity decrease in the first cycles. [39] The cycling was also accompanied by the formation of a polymeric gel-like layer due to the decomposition of electrolyte, and the activation process that provided more active sites, thus the capacity gradually increased and reached stable states. [7] In contrast, the capacity of CFO-3 degraded significantly, and the plateaus disappeared during the cycling (Figure 3i), which might be due to the pulverization of active materials upon repeated discharge and charge.…”