Dataset Information

Achieving long cycle life for all-solid-state rechargeable Li-I₂ battery by a confined dissolution strategy.

ABSTRACT: Rechargeable Li-I₂ battery has attracted considerable attentions due to its high theoretical capacity, low cost and environment-friendliness. Dissolution of polyiodides are required to facilitate the electrochemical redox reaction of the I₂ cathode, which would lead to a harmful shuttle effect. All-solid-state Li-I₂ battery totally avoids the polyiodides shuttle in a liquid system. However, the insoluble discharge product at the conventional solid interface results in a sluggish electrochemical reaction and poor rechargeability. In this work, by adopting a well-designed hybrid electrolyte composed of a dispersion layer and a blocking layer, we successfully promote a new polyiodides chemistry and localize the polyiodides dissolution within a limited space near the cathode. Owing to this confined dissolution strategy, a rechargeable and highly reversible all-solid-state Li-I₂ battery is demonstrated and shows a long-term life of over 9000 cycles at 1C with a capacity retention of 84.1%.

SUBMITTER: Cheng Z

PROVIDER: S-EPMC8748797 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature

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Achieving long cycle life for all-solid-state rechargeable Li-I2 battery by a confined dissolution strategy.

Cheng Zhu Z Pan Hui H Li Fan F Duan Chun C Liu Hang H Zhong Hanyun H Sheng Chuanchao C Hou Guangjin G He Ping P Zhou Haoshen H

Nature communications 20220110 1

Rechargeable Li-I2 battery has attracted considerable attentions due to its high theoretical capacity, low cost and environment-friendliness. Dissolution of polyiodides are required to facilitate the electrochemical redox reaction of the I2 cathode, which would lead to a harmful shuttle effect. All-solid-state Li-I2 battery totally avoids the polyiodides shuttle in a liquid system. However, the insoluble discharge product at the conventional solid interface resul ...[more]

PMID: 35013285

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Project description:The substitution of an organic liquid electrolyte with lithium-conducting solid materials is a promising approach to overcome the limitations associated with conventional lithium-ion batteries. These constraints include a reduced electrochemical stability window, high toxicity, flammability, and the formation of lithium dendrites. In this way, all-solid-state batteries present themselves as ideal candidates for improving energy density, environmental friendliness, and safety. In particular, all-solid-state configurations allow the introduction of compact, lightweight, high-energy-density batteries, suitable for low-power applications, known as thin-film batteries. Moreover, solid electrolytes typically offer wide electrochemical stability windows, enabling the integration of high-voltage cathodes and permitting the fabrication of higher-energy-density batteries. A high-voltage, all-solid-state lithium-ion thin-film battery composed of LiNi0.5Mn1.5O4 cathode, a LiPON solid electrolyte, and a lithium metal anode has been deposited layer by layer on low-cost stainless-steel current collector substrates. The structural and electrochemical properties of each electroactive component of the battery had been analyzed separately prior to the full cell implementation. In addition to a study of the internal solid-solid interface, comparing them was done with two similar cells assembled using conventional lithium foil, one with thin-film solid electrolyte and another one with thin-film solid electrolyte plus a droplet of LP30 liquid electrolyte. The thin-film all-solid state cell developed in this work delivered 80.5 mAh g-1 in the first cycle at C/20 and after a C-rate test of 25 cycles at C/10, C/5, C/2, and 1C and stabilized its capacity at around 70 mAh g-1 for another 12 cycles prior to the start of its degradation. This cell reached gravimetric and volumetric energy densities of 333 Wh kg-1 and 1,212 Wh l-1, respectively. Overall, this cell showed a better performance than its counterparts assembled with Li foil, highlighting the importance of the battery interface control.

Dataset Information

Achieving long cycle life for all-solid-state rechargeable Li-I₂ battery by a confined dissolution strategy.

Publications

Achieving long cycle life for all-solid-state rechargeable Li-I<sub>2</sub> battery by a confined dissolution strategy.

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