A Novel Tin-Bonded Silicon Anode for Lithium-Ion Batteries

Abstract

Poor cyclic stability and low rate performance due to dramatic volume change and low intrinsic electronic conductivity are the two key issues needing to be urgently solved in silicon (Si)-based anodes for lithium-ion batteries. Herein, a novel tin (Sn)-bonded Si anode is proposed for the first time. Sn, which has a high electronic conductivity, is used to bond the Sianode material and copper (Cu) current collector together using a hot-pressed method with a temperature slightly above the melting point of Sn. The cycling performance of the electrode is studied using a galvanostatic method. Nanoindentation and peeling tests are conducted to measure the mechanical strength of the electrodes. Direct current polarization and galvanostatic intermittent titration techniques are applied to assess the conductivity of the composites. Electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy are conducted to evaluate the effect of the coating layer on the cycling ability of the composites. The Sn-bonded Si anodes show superior cycling stability and high rate performance with an improved initial Coulombic efficiency. Analyses reveal that the low-melting-point Sn helps to markedly improve the electronic conductivity of the electrodes and serves as a metallic binder as well to enhance the adhesive strength of the electrode. It is hopeful that this novel Sn-bonded Si anode provides a new insight for the development of advanced Si-based anodes for LIBs.

Improvement of the Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 via Atomic Layer Deposition of Lithium-Rich Zirconium Phosphate Coatings

“…Lithium-ion diffusivity at the ACEI is an important parameter for lithium-ion electrodes. From GITT, we can calculate the lithium-ion diffusivity of the electrodes under quasi-static equilibrium conditions without any influence from the ACEI layers on the cathode material. ,− Figure S8a–c shows time vs GITT plots for uncoated NMC811 and Zr x PO y - and Li x Zr y PO z -coated NMC811 electrodes. Figure S8d,e shows lithium-ion diffusion coefficient curves during charging and discharging for the uncoated and Zr x PO y - and Li x Zr y PO z -coated NMC811 electrodes.…”

New Insights into the Effects of Zr Substitution and Carbon Additive on Li3–xEr1–xZrxCl6 Halide Solid Electrolytes

“…Although lithium-ion batteries (LIBs) have occupied the main market in the fields of consumer electronics batteries, power batteries, and energy storage batteries, the safety concerns originating from flammable organic liquid electrolytes still need to be solved urgently. , All-solid-state lithium-ion batteries (ASSLIBs) that employ nonflammable inorganic solid electrolytes (SEs) have been considered as the most promising candidate for next-generation energy storage devices due to their excellent safety and high energy density. − SE is the key to the success of ASSLIBs, and it needs to meet multiple requirements, such as high ionic conductivity, low electronic conductivity, mechanical deformability, and wide electrochemical stability window. , …”

Si-based Composite Anode for Li-ion Batteries with Enhanced Cycle Stability via Doping Cu3Si Phase Achieved by Modified Coating of PDA

“…The CV curves of three samples in the initial two cycles are presented in Figures 5(a-c), showing similar electrochemical processes. Specifically, due to the formation of SEI film 53,54 , there was only a small and broad cathodic peak at ~0.75 V in the 1 st cycle, which is much obvious for Si@c-PDA and Si-Cu3Si@c-PDA. A sharp cathodic peak at ~0.05 V in the 1 st cycle is due to the generation of crystalline Li3.75Si (c-Li3.75Si) 55,56 .…”