Ion-Transport-Rectifying Layer Enables Li-Metal Batteries with High Energy Density

Xu, Yifei; Gao, Lina; Shen, Li; Liu, Qianqian; Zhu, Yingying; Liu, Qian; Li, Linsen; Lu, Yunfeng; Wu, Hao Bin

doi:10.1016/j.matt.2020.08.011

Cited by 87 publications

(68 citation statements)

References 61 publications

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“…Consequently, a dendrite-free Li anode with a smooth deposition is formed. However, in the absence of Ti 0.87 O 2 layers, a large energy barrier is needed during the de-solvation process 67,68 . The distribution and transport of Li + ions are inhomogeneous and then form Li tips.…”

Section: Resultsmentioning

confidence: 99%

Atomic-scale tandem regulation of anionic and cationic migration for long-life alkali metal batteries

Xiong

Zhang

et al. 2021

Preprint

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Atomic-scale regulation of both cationic and anionic transport is of great significance in membrane-based separation technologies. Ionic transport regulation techniques could also play a crucial role in developing high-performance alkali metal batteries such as alkali metal-sulfur and alkali metal-selenium batteries, which suffer from the non-uniform transport of alkali metal ions and detrimental shuttling of polysulfide/polyselenide (PS) anions. These obstacles can cause severe growth of alkali metal dendrites and the irreversible consumption of active cathodes, leading to capacity decay and short cycling life. Herein, we report long-life alkali metal batteries enabled by atomic-scale tandem regulation of the migration of both alkali metal cations (Li+/Na+) and PS anions using negatively charged Ti0.87O2 nanosheets with Ti atomic vacancies. The shuttling of PS anions has been effectively eliminated via a robust electrostatic repulsion between the negatively charged nanosheets and PS anions. The negatively charged nanosheets can also regulate the migration of Li+/Na+ ions to ensure a homogeneous ion flux through efficient but light adhesion of Li+/Na+ ions within the nanosheets. The atomic Ti vacancies act as sub-nanometre pores to provide fast diffusion channels for Li+/Na+ ions. Therefore, eradication of PS shuttling and stable Li/Na-ion diffusion without compromising the fast transport of Li+/Na+ ions has been achieved for long-life alkali metal-sulfur and alkali metal-selenium batteries. This work provides a facile and effective strategy to regulate the transport of both cations and anions for developing advanced rechargeable batteries by using two-dimensional vacancy-enhanced materials.

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Section: Resultsmentioning

confidence: 99%

Atomic-scale tandem regulation of anionic and cationic migration for long-life alkali metal batteries

Xiong

Zhang

et al. 2021

Preprint

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“…The high tLi+ and DLi+ (related to high apparent σLi+) values of battery electrolyte can help to mitigate the concentration gradient and promote the dendrite-free Li metal formation, based on the Sand's capacity (CSand) model as the safety limit for metal batteries 44 . Recently, many researchers verified this model in their SSE works 45 , for instance, the metal-organic frameworks (MOFs)-based single Li + conductors 24,46,47 . Hence, in this work, the PPS-QSSE with high tLi+=0.8-0.9 and DLi+ (Fig.…”

Section: Homogenous Li-platingmentioning

confidence: 91%

“…It should be noted here that both the N/P ratio (R value) and cycling life (C value) are important factors for the practical use of Li metal batteries (LMBs) 53 . Hence, the C/R value has been used for the comparison among different LMB systems 47 . In our PPS-QSSE work, the best C/R value of 96 was achieved by using the HVLCO cathode with high loadings of 3.5 mAh cm -2 and 2 mAh cm -2 Li loadings anode (N/P=0.57), which was more outstanding than most of recently reported LMBs works, especially at high charge/discharge current density, as listed in Table S1 and S2.…”

Section: Metal Battery With Limited Li-plating Cu Anodementioning

confidence: 99%

“…In our PPS-QSSE work, the best C/R value of 96 was achieved by using the HVLCO cathode with high loadings of 3.5 mAh cm -2 and 2 mAh cm -2 Li loadings anode (N/P=0.57), which was more outstanding than most of recently reported LMBs works, especially at high charge/discharge current density, as listed in Table S1 and S2. Based on the calculation model proposed by Xu et al 47 and Niu et al 53 , assuming that an 1 Ah pouch cell adopts the same cell parameters and the 1 Ah pouch cell with PPS-QSSE demo fabricated by Ampreus (Wuxi) Co., Ltd. (Fig. S18), the LMB with PPS-QSSE and HVLCO could achieve a high energy density of 1049 Wh L -1 (319 Wh kg -1 ) and power density of ~900 W L -1 , for rough comparison (Fig.…”

Section: Metal Battery With Limited Li-plating Cu Anodementioning

confidence: 99%

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Polyphenylene sulfide quasi-solid-state electrolyte for limited Li metal battery

Chen¹,

Zhou²,

Yu³

et al. 2021

Preprint

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The urgent need for safe and high energy batteries is pushing the battery studies towards the solid-state direction, and the most central question is finding proper solid-state electrolyte. So far, the recently studied electrolyte systems have obvious advantages and fatal weaknesses, resulting in indecisive plans for industrial production. In this work, we propose a thin and dense lithiated polyphenylene sulfide (PPS)-based solid polymer electrolyte prepared by a solvent-free process in a pilot stage. Moreover, the PPS surface is functionalized to immobilize the anions, increase the Li ion transference number to 0.8-0.9, and widen the electrochemical potential window (>5.1 V). At room temperature, the PPS-based quasi-solid electrolyte (PPS-QSSE) exhibits high intrinsic Li+ diffusion coefficient and ionic conductivity (>10-4 S cm-1), excellent thermal stability, and Li+ transport rectifying effect, resulting in homogenous Li-plating on Cu at high current density. Based on the limited Li-plated Cu anode or anode-free Cu, high loadings cathode and high voltage, the Li metal batteries with PPS-QSSEs deliver high energy density (>1000 Wh L-1) and good cycling at high power (900 W L-1) exceeding that of state-of-the-art Li-ion batteries. The results enlighten the mechanism of solid-liquid two phase conduction and promote the solid-state battery towards practicality.

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“…A representative example is that a thin UiO-66 MOFbased artificial SEI layer was prepared to act as an ion transport rectifier to regulate Li stripping/plating. The high Li ion transference number enabled by the strong binding of anions to the exposed Zr sites, high diffusion coefficient, and high mechanical modulus of the UiO-66 MOF-based artificial SEI layer can effectively inhibit uneven Li deposition and prevent dendrite growth 325.…”

mentioning

confidence: 99%

Material design and structure optimization for rechargeable lithium-sulfur batteries

Guo

2021

Matter

128

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With the merits of low cost, abundant resources, environment friendliness, and high energy density, the Li-S battery is recognized as a promising alternative to the Li ion battery and is anticipated to play an important role in high-energy-density electrochemical storage systems. In this review, we first review the development process of Li-S batteries and briefly introduce the working principle of Li-S batteries. The scientific problems existing in the Li-S batteries, such as sulfur cathode, separator, electrolyte, and Li anode, and the corresponding countermeasures, are then summarized. Subsequently, main research advancements of Li-S batteries are comprehensively reviewed, and the critical concerns about commercialization of Li-S batteries are discussed. Finally, we give our perspectives on the development of high-performance Li-S batteries. We hope this review can provide the timely and comprehensive information on the future research direction of Li-S batteries and offer the guidance for material design and structure optimization of Li-S batteries.

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Ion-Transport-Rectifying Layer Enables Li-Metal Batteries with High Energy Density

Cited by 87 publications

References 61 publications

Atomic-scale tandem regulation of anionic and cationic migration for long-life alkali metal batteries

Atomic-scale tandem regulation of anionic and cationic migration for long-life alkali metal batteries

Polyphenylene sulfide quasi-solid-state electrolyte for limited Li metal battery

Material design and structure optimization for rechargeable lithium-sulfur batteries

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