A long-lasting dual-function electrolyte additive for stable lithium metal batteries

Wang, Dongdong; Liu, Haodong; Li, Mingqian; Xia, Dawei; Holoubek, John; Deng, Zhi; Yu, Mingyu; Tian, Jianhua; Shan, Zhongqiang; Ong, Shyue Ping; Liu, Ping; Chen, Zheng

doi:10.1016/j.nanoen.2020.104889

Cited by 92 publications

(58 citation statements)

References 64 publications

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“…The Li‐Li symmetric cells showed stable cycle performance for > 1000 hour. Similar effect [ 51 ] could also be observed by using K + as the additive. When the concentration of functional additive potassium nonafluoro‐1‐butanesulfonate (KPBS) was < 0.02 M, the effective reduction potentials of K + (–3.032 V at 0.02 M) were lower than that of Li + (–3.022 V at a total concentration of 2 M) in Lithium bis(trifluoromethanesulfonyl)imide/lithium bis(fluorosulfonyl)imide (LiTFSI/LiFSI) ether electrolyte.…”

Section: Electrostatic Shield Mechanismsupporting

confidence: 76%

“…Meanwhile, introducing LiF into SEI could not only improve the mechanical stability of SEI, but also promoted the transport of Li on the interface, which was conducive to the formation of more uniform morphology during lithium deposition. [ 51 ] Furthermore, the addition of VC or FEC could benefit the more uniform distribution of Li x As alloy nanosized seeds and improve the flexibility of SEI layer. The synergistic effect of LiAsF 6 and cyclic carbonate additives resulted in a self‐aligned columnar structure of lithium, which was dense, uniform and dendrite‐free (Figure 7B).…”

Section: Alloying Mechanismmentioning

confidence: 99%

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Electrolyte additives: Adding the stability of lithium metal anodes

Dai

Wang

2020

Nano Select

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Lithium metal is regarded as the “holy grail” of anodes due to its highest theoretical specific capacity and lowest electrode potential, and hence is considered as a promising anode candidate to meet the growing demand for large scale energy storage devices. However, lithium metal anode is suffering the challenges in side reactions, volume change, and low Coulombic efficiency, and particularly the growth of lithium dendrites, which extremely limits its practical applications. To tackle these issues, many strategies have been developed. Among them, the addition of electrolyte additives is an effective and the simplest method. In this review, electrolyte additives for enhancing the stability of Li metal anodes are summarized, according to their different working mechanisms. The prospects of key challenges and future trends of such electrolyte additives are discussed.

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Section: Electrostatic Shield Mechanismsupporting

confidence: 76%

Section: Alloying Mechanismmentioning

confidence: 99%

Electrolyte additives: Adding the stability of lithium metal anodes

Dai

Wang

2020

Nano Select

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“…Figure S12b, Supporting Information, demonstrates that even though LiDFOB has a high thermostability, an inferior long‐cycling at 80 °C has been found when increasing LiDFOB from 1.5 to 5.0 w%. [ 48 ] Thus, it's necessary to reduce the additive amount. In fact, our two recommended types of initiators enable the effective dose is tiny and the residual amounts would further reduce because of the reaction between additives and Li electrode, as illustrated in Formula 2–4 of Figure S1b, Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

In‐Built Quasi‐Solid‐State Poly‐Ether Electrolytes Enabling Stable Cycling of High‐Voltage and Wide‐Temperature Li Metal Batteries

Chen

Huo

Chen

et al. 2021

Adv Funct Materials

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Developing solid‐state electrolytes with good compatibility for high‐voltage cathodes and reliable operation of batteries over a wide‐temperature‐range are two bottleneck requirements for practical applications of solid‐state metal batteries (SSMBs). Here, an in situ quasi solid‐state poly‐ether electrolyte (SPEE) with a nano‐hierarchical design is reported. A solid‐eutectic electrolyte is employed on the cathode surface to achieve highly‐stable performance in thermodynamic and electrochemical aspects. This performance is mainly due to an improved compatibility in the electrode/electrolyte interface by nano‐hierarchical SPEE and a reinforced interface stability, resulting in superb‐cyclic stability in Li||Li symmetric batteries (>4000 h at 1 mA cm−2/1 mAh cm−2; >2000 h at 1 mA cm−2/4 mAh cm−2), which are the same for Na, K, and Zn batteries. The SPEE enables outstanding cycle‐stability for wide‐temperature operation (15–100 °C) and 4 V‐above batteries (Li||LiCoO2 and Li||LiNi0.8Co0.1Mn0.1O2). The work paves the way for development of practical SSMBs that meet the demands for wide‐temperature applicability, high‐energy density, long lifespan, and mass production.

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“…[ 1–3 ] Nevertheless, there are several intractable scientific and technical problems such as the dissolution of lithium polysulfides (LiPS) in electrolyte, non‐electric conductivity and serious volume expansion of sulfur, impeding the practical application of Li–S batteries. [ 4–6 ] To break through these bottlenecks, many strategies have been used to enhance the electrochemical performance of Li–S batteries such as constructing host materials of sulfur cathode, [ 6–9 ] modifying functional separators, [ 10,11 ] introducing interlayers, [ 12–14 ] adding electrolyte additive, [ 15–17 ] and using new binders. [ 18,19 ] Chen and coworkers synthesized a yolk–shelled carbon@Fe 3 O 4 nanoboxes as highly efficient sulfur host for Li–S batteries, delivering high specific capacity, excellent rate capacity, and long cycling stability.…”

mentioning

confidence: 99%

Strong Chemical Interaction between Lithium Polysulfides and Flame‐Retardant Polyphosphazene for Lithium–Sulfur Batteries with Enhanced Safety and Electrochemical Performance

et al. 2021

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The shuttle effect of lithium polysulfides (LiPS) and potential safety hazard caused by the burning of flammable organic electrolytes, sulfur cathode, and lithium anode seriously limit the practical application of lithium–sulfur (Li–S) batteries. Here, a flame‐retardant polyphosphazene (PPZ) covalently modified holey graphene/carbonized cellulose paper is reported as a multifunctional interlayer in Li–S batteries. During the discharge/charge process, once the LiPS are generated, the as‐obtained flame‐retardant interlayer traps them immediately through the nucleophilic substitution reaction between PPZ and LiPS, effectively inhibiting the shuttling effect of LiPS to enhance the cycle stability of Li–S batteries. Meanwhile, this strong chemical interaction increases the diffusion coefficient for lithium ions, accelerating the lithiation reaction with complete inversion. Moreover, the as‐obtained interlayer can be used as a fresh 3D current collector to establish a flame‐retardant “vice‐electrode,” which can trap dissolved sulfur and absorb a large amount of electrolyte, prominently bringing down the flammability of the sulfur cathode and electrolyte to improve the safety of Li–S batteries. This work provides a viable strategy for using PPZ‐based materials as strong chemical scavengers for LiPS and a flame‐retardant interlayer toward next‐generation Li–S batteries with enhanced safety and electrochemical performance.

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A long-lasting dual-function electrolyte additive for stable lithium metal batteries

Cited by 92 publications

References 64 publications

Electrolyte additives: Adding the stability of lithium metal anodes

Electrolyte additives: Adding the stability of lithium metal anodes

In‐Built Quasi‐Solid‐State Poly‐Ether Electrolytes Enabling Stable Cycling of High‐Voltage and Wide‐Temperature Li Metal Batteries

Strong Chemical Interaction between Lithium Polysulfides and Flame‐Retardant Polyphosphazene for Lithium–Sulfur Batteries with Enhanced Safety and Electrochemical Performance

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