Preset Lithium Source Electrolyte Boosts SiO Anode Performance for Lithium-Ion Batteries

Abstract

SiO is a promising alternative to Si as the anode material for lithium-ion batteries, but it still suffers from a low initial coulomb efficiency, poor electrical conductivity, unstable cycling performance, etc. Various strategies have been attempted to solve these issues but were left unsolved. In this work, we propose a simple strategy that checks all of the right boxes by presetting a lithium source electrolyte (Li2CO3) into a SiO film using the magnetron sputtering method. The preset lithium source electrolyte provides both the lithium ions and the electrolyte required for the formation of a solid electrolyte interphase and thus significantly improves the initial coulomb efficiency. The lithium source electrolyte also acts as a medium to facilitate the growth of a solid electrolyte interphase inside this composite film in addition to its surfaces. The interior interphase provides an efficient and fast pathway for lithium-ion transmission during the lithiation process and thus improves the anode conductivity and the rate performance. The interior interphase also suppresses the brittle fracture by buffering the dramatic volume change during the lithiation/delithiation process and stabilizes the cycling performance substantially. In addition, this strategy is safe, green, and of low-cost, when compared to others, and provides a feasible way to commercialize the SiO anode for lithium-ion batteries.

Improving Electrochemical Performance of Thick Silicon Film Anodes with Implanted Solid Lithium Source Electrolyte

“…In addition, the results of the quantitatively separated capacitive and diffusive contributions to capacity (Figure g) reveal that the enhancement of the rate performance of the Si-SE film originates from improvement of the capacitive effect. Similar observations can be found in previous reports. , …”

“…Similar observations can be found in previous reports. 50,51 Figure 4a displays the rate capacity comparison of Si-SE and Si film. The discharge capacities of Si-SE are ∼2057, 2009, 1904, 1703, and 1661 mAh g −1 at 0.1, 0.2, 0.5, 1, and 2 C, respectively.…”

Enhancing the cycling stability of a hollow architecture Li-rich cathode via Ce-integrated surface/interface/doping engineering

“…The smaller gap between the charging and discharging curves of LLO@Ce-LCO indicates that the polarization decreased, in conformity to its distinct spinel heterogeneous interface. [44][45][46] The CV curves of the first three cycles of the three samples at a sweep speed of 0.1 mV s −1 were analyzed, as shown in Fig. S10.…”

“…The smaller gap between the charging and discharging curves of LLO@Ce–LCO indicates that the polarization decreased, in conformity to its distinct spinel heterogeneous interface. 44–46…”

Enabling 4.6 V LiNi0.6Co0.2Mn0.2O2 cathodes with excellent structural stability: combining surface LiLaO2 self-assembly and subsurface La-pillar engineering

“…Despite the rapid development of lithium-ion batteries (LIBs) in recent decades, their finite energy and power densities are regarded as the main barriers to their further application [1][2][3][4] . The cathode is the most critical component and is crucial in determining the working voltage, energy density and cost of a LIB [5][6][7][8][9] .…”