Using Li2S to Compensate for the Loss of Active Lithium in Li-ion Batteries

Zhan, Yuanjie; Yu, Hailong; Ben, Liubin; Chen, Yuyang; Huang, Xuejie

doi:10.1016/j.electacta.2017.09.167

Cited by 55 publications

(38 citation statements)

References 33 publications

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“…Fourthly, the pre-lithiation agent has to be not only electrochemically stable but also thermally, chemically and mechanically stable after de-lithiation. The investigated additives range from binary compounds, such as Li2S [115,116], Li3N [117,118], LiN3 [119], Li2O [114,120], Li2O2 [121] or LiF [122], to ternary compounds, such as Li5FeO4 [123], Li2NiO2 [124,125], Li6CoO4 [126] or Li2MoO3 [127].…”

Section: Pre-lithiation By Using Positive Electrode Additivesmentioning

confidence: 99%

“…Furthermore, Li 2 S is incompatible with carbonate-based electrolytes. Zhan et al [116] investigated this issue by mixing Li 2 S with Ketjenblack (KB) and poly(vinylpyrrolidone) (PVP) but this mixture was not used with NMP in the positive electrode preparation process. Another approach to solve the compatibility problems of Li 2 S is to introduce transition metals (e.g., Fe or Co) [115].…”

Section: Pre-lithiation By Using Positive Electrode Additivesmentioning

confidence: 99%

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Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

et al. 2018

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Abstract:In order to meet the sophisticated demands for large-scale applications such as electro-mobility, next generation energy storage technologies require advanced electrode active materials with enhanced gravimetric and volumetric capacities to achieve increased gravimetric energy and volumetric energy densities. However, most of these materials suffer from high 1st cycle active lithium losses, e.g., caused by solid electrolyte interphase (SEI) formation, which in turn hinder their broad commercial use so far. In general, the loss of active lithium permanently decreases the available energy by the consumption of lithium from the positive electrode material. Pre-lithiation is considered as a highly appealing technique to compensate for active lithium losses and, therefore, to increase the practical energy density. Various pre-lithiation techniques have been evaluated so far, including electrochemical and chemical pre-lithiation, pre-lithiation with the help of additives or the pre-lithiation by direct contact to lithium metal. In this review article, we will give a comprehensive overview about the various concepts for pre lithiation and controversially discuss their advantages and challenges. Furthermore, we will critically discuss possible effects on the cell performance and stability and assess the techniques with regard to their possible commercial exploration.

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Section: Pre-lithiation By Using Positive Electrode Additivesmentioning

confidence: 99%

Section: Pre-lithiation By Using Positive Electrode Additivesmentioning

confidence: 99%

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

et al. 2018

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“…Core–shell Li 2 S/KB/PVP was developed as Li donor in the LiFePO 4 system (with a potential range of ≈2.5–3.8 V). [ 94 ] The improved electric conductivity and the good compatibility with carbonate electrolyte enable this composite to supply a high capacity of about 1050 mAh g −1 . However, the formed insoluble and insulating sulfur after the first charge will cover the surface of active materials and thus reduce the electrochemical performance.…”

Section: Summaries Classification and Comparisons Of Current Pre‐lith...mentioning

confidence: 99%

Pre‐Lithiation Strategies for Next‐Generation Practical Lithium‐Ion Batteries

et al. 2021

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Next‐generation Li‐ion batteries (LIBs) with higher energy density adopt some novel anode materials, which generally have the potential to exhibit higher capacity, superior rate performance as well as better cycling durability than conventional graphite anode, while on the other hand always suffer from larger active lithium loss (ALL) in the first several cycles. During the last two decades, various pre‐lithiation strategies are developed to mitigate the initial ALL by presetting the extra Li sources to effectively improve the first Coulombic efficiency and thus achieve higher energy density as well as better cyclability. In this progress report, the origin of the huge initial ALL of the anode and its effect on the performance of full cells are first illustrated in theory. Then, various pre‐lithiation strategies to resolve these issues are summarized, classified, and compared in detail. Moreover, the research progress of pre‐lithiation strategies for the representative electrochemical systems are carefully reviewed. Finally, the current challenges and future perspectives are particularly analyzed and outlooked. This progress report aims to bring up new insights to reassess the significance of pre‐lithiation strategies and offer a guideline for the research directions tailored for different applications based on the proposed pre‐lithiation strategies summaries and comparisons.

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“…Sacrificial lithium salts, including Li 2 C 4 O 4 , LiC 2 O 2 , Li 2 C 3 O 5 , and Li 2 C 4 O 6 , deliver relatively higher specific capacities (300–600 mA h/g). However, undesired gases would be produced, accompanied by their decomposition. − In our previous work, conversion reaction-based prelithiation reagents including M (M = Fe, Co, or Ni)/Li 2 O, M/LiF, and M/Li 2 S composite have been explored and these additives can release high Li-ion capacities (e.g., >500 mA h/g) without gas products during the Li-ion extraction process. , However, Li 2 S is highly toxic and reactive with trace H 2 O in the ambient air, which makes M/Li 2 S composite impractical for industrial application. With better stability than Li 2 S, Li 2 O is still hygroscopic and it easily reacts with humidity in the ambient air to form LiOH (Δ G = −0.315 eV, Figure a,b).…”

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confidence: 99%

Metal/LiF/Li₂O Nanocomposite for Battery Cathode Prelithiation: Trade-off between Capacity and Stability

Wang

Eng

et al. 2019

Nano Lett.

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Lithium-ion batteries (LIBs) are currently dominating the portable electronics market and supplying power for electric vehicles and grid-level storage. However, lithium loss in the formation cycle at the anode side reduces the energy density of state-of-the-art LIBs with carbon anode materials. This situation will be even more severe for future LIBs using high-capacity Si-based anode materials. In this study, a transition metal-based nanocomposite with built-in lithium source was synthesized, featuring Fe nanodomains with a size of ∼5 nm uniformly dispersed in a hybrid Li2O and LiF matrix with intimate contact between them. The Fe/LiF/Li2O nanocomposite released a high Li-ion capacity of 550 mA h/g based on a multielectron inverse conversion reaction during the first-cycle charge process and exhibited better ambient stability than the counterpart with a pure Li2O matrix and also a lower lithium-extraction voltage and faster reaction kinetics than the counterpart with a pure LiF matrix. Serving as an additive to various cathodes (e.g., LiCoO2, LiFePO4, and LiNi1‑x‑y Co x Mn y O2), the Fe/LiF/Li2O nanocomposite showed excellent lithium compensation effect. Using 4.8 wt % Fe/LiF/Li2O additive based on the total mass of the electrodes, a LiNi0.8Co0.1Mn0.1O2|SiO-graphite full cell with a high cathode mass loading of 20 mg/cm2 exhibited a high reversible capacity of 2.9 mA h/cm2 at 0.5 C after 100 cycles which is a 15% increase in comparison to the counterpart without the prelithiation additive. After the Fe/LiF/Li2O nanocomposite was immersed into the electrolyte and rested for 72 h, the content of iron metal in the electrolyte was negligible, indicating that this prelithiation additive was stable in the electrolyte and would not cause any side reactions, such as the shuttle of iron ions during cycling. The high “donor” Li-ion capacity, good ambient stability, and its compatibility with existing cathode materials and battery fabrication processes make the Fe/LiF/Li2O nanocomposite a promising cathode prelithiation additive to offset the initial lithium loss and improve the energy density of LIBs.

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Using Li2S to Compensate for the Loss of Active Lithium in Li-ion Batteries

Cited by 55 publications

References 33 publications

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

Pre‐Lithiation Strategies for Next‐Generation Practical Lithium‐Ion Batteries

Metal/LiF/Li₂O Nanocomposite for Battery Cathode Prelithiation: Trade-off between Capacity and Stability

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Using Li2S to Compensate for the Loss of Active Lithium in Li-ion Batteries

Cited by 55 publications

References 33 publications

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

Pre‐Lithiation Strategies for Next‐Generation Practical Lithium‐Ion Batteries

Metal/LiF/Li2O Nanocomposite for Battery Cathode Prelithiation: Trade-off between Capacity and Stability

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Metal/LiF/Li₂O Nanocomposite for Battery Cathode Prelithiation: Trade-off between Capacity and Stability