Watermelon-like texture lithium titanate and silicon composite films as anodes for lithium-ion battery with high capacity and long cycle life

Wei, Kun; Zhou, Lihang; Wang, Shen; Wei, Jiuxing; Yan, Dongliang; Cheng, Yan; Yu, Zhaozhe

doi:10.1016/j.jallcom.2021.160994

Cited by 12 publications

(8 citation statements)

References 43 publications

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“…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. , …”

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confidence: 93%

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

Zhou

Tong

et al. 2022

J. Phys. Chem. Lett.

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Silicon is a potential next-generation anode material for a lithium-ion battery. However, the large-scale application of silicon is restricted by poor electrical conductivity, large volume change, and high irreversible capacity during the charge/discharge process. Here, we proposed a simple strategy by preimplanting a solid lithium source electrolyte (Li2CO3 and Li2O) into Si thick film to improve the electrochemical properties of Si materials. The implanted solid lithium source electrolyte participates in and induces the formation of SEI not only on the top surface of Si film but also in the interface of Si particles. The thick Si film with the implanted solid lithium electrolyte (a thickness of ∼10 μm) delivers above 2000 mAh g–1 specific capacity, >92% initial Coulombic efficiency, and ∼87% capacity retention over 150 cycles at 400 mA g–1. The present work sheds light on the design of high capacity and long cycle life electrode materials for other batteries.

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confidence: 93%

“…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.…”

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confidence: 99%

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

Zhou

Tong

et al. 2022

J. Phys. Chem. Lett.

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“…Despite the overwhelming demand for lithium-ion batteries (LIBs) from booming electronic devices, electrical vehicles, etc., − the capacity of LIBs is still limited by the specific capacity (372 mAh g –1 ) of traditional anode materials, such as graphite. − While Si has a high theoretical specific capacity of 4200 mAh g –1 and a practical capacity of 3580 mAh g –1 and is believed to be one of the most promising anode materials, the brittle fracture that resulted from the huge volume variation (>300%) in delithiation/lithiation cycles blocks it from use in wide applications. − The huge volume expansion comes from the chemical reaction between Si and Li that produces the Si–Li compound. One way to defuse it is to compromise the capacity by replacing Si with SiO.…”

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confidence: 99%

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

Zhou

Cheng

et al. 2022

ACS Sustainable Chem. Eng.

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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.

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“…The b -value is obtainable by plotting the slope of the log( v )–log( i ) line. The b -value of 0.5 indicates a diffusion-controlled process, whereas a b -value of 1 suggests a pseudocapacitive-controlled process. , The b -values of the cathodic and anodic peaks in the Si-MO film (Figure c) are 0.65 and 0.74, respectively, while that in the Si film (Figure S9b) is close to 0.5. This shows that the charge storage capacity in the Si-MO film originates from both pseudocapacitive and diffusion contributions, while diffusion predominates in the Si film.…”

Section: Resultsmentioning

confidence: 99%

Binder-Free Intertwined Si and MnO₂ Composite Electrode for High-Performance Li-Ion Battery Anode

Yu,

Guan,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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Silicon is considered as the most felicitous anode material candidate for lithium-ion batteries on account of abundant availability, suitable operating potential, and high specific capacity. Nevertheless, drastic volume expansion during the cycle impedes its practical utilization. Herein, Si and MnO 2 (Si-MO) constructed the binder-free intertwined electrode that is reported to effectively improve upon the cycling stability of Si-based materials. The Si-based electrode without a binder has good electrical conductivity, strong adhesion to the substrate, and ample space for mitigating volume expansion. The incorporation of MnO 2 establishes a multiphase interface, which mitigates the electrode volume expansion, and supports the electrode structure. Furthermore, MnO 2 (∼1230 mAh g −1 theoretical capacity) synergistically enhances the overall capacity of the composite electrodes. Consequently, the Si-MO composite electrode exhibits a reversible specific capacity of 1300 mAh g −1 at 420 mA g −1 and remarkable cycling performance with a specific capacity of 830 mAh g −1 after 500 cycles. In particular, a reversible specific capacity of 837 mAh g −1 at 4200 mA g −1 is achieved and remains stable during 200 cycles. This work provides a potentially feasible way to achieve the Sibased anode commercialization for LIBs.

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Watermelon-like texture lithium titanate and silicon composite films as anodes for lithium-ion battery with high capacity and long cycle life

Cited by 12 publications

References 43 publications

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

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

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

Binder-Free Intertwined Si and MnO₂ Composite Electrode for High-Performance Li-Ion Battery Anode

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Watermelon-like texture lithium titanate and silicon composite films as anodes for lithium-ion battery with high capacity and long cycle life

Cited by 12 publications

References 43 publications

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

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

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

Binder-Free Intertwined Si and MnO2 Composite Electrode for High-Performance Li-Ion Battery Anode

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Binder-Free Intertwined Si and MnO₂ Composite Electrode for High-Performance Li-Ion Battery Anode