Dataset Information

A Highly Durable Rubber-Derived Lithium-Conducting Elastomer for Lithium Metal Batteries.

ABSTRACT: Elastomers offer attractive advantages over classical solid-state electrolytes in terms of ensuring stable interfacial contact and maintaining fatigue durability, but the low ionic conductivity obstructs their practical applications in long-life lithium metal batteries. In this work, rubber-derived lithium-conducting elastomer has been developed via sulfur vulcanization of nitrile butadiene rubber with a polymerizable ionic liquid to provide both high resilience and dramatically improved ionic conductivity. Owing to the chemically crosslinked network between rubber chains and ionic liquid fragments generated during vulcanization, the elastic lithium-conductor achieves high resilience of 0.92 MJ m^-3 , superior cyclic durability of 1000 cycles at 50% strain, and high room-temperature ionic conductivity of 2.7 × 10^-4 S cm^-1 . Consequently, the corresponding solid-state lithium/LiFePO₄ battery exhibits a high capacity of ≈146 mAh g^-1 with a high capacity retention of 94.3% for up to 300 cycles.

SUBMITTER: Shi Y

PROVIDER: S-EPMC9165490 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature

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A Highly Durable Rubber-Derived Lithium-Conducting Elastomer for Lithium Metal Batteries.

Shi Yongzheng Y Yang Na N Niu Jin J Yang Shubin S Wang Feng F

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20220331 16

Elastomers offer attractive advantages over classical solid-state electrolytes in terms of ensuring stable interfacial contact and maintaining fatigue durability, but the low ionic conductivity obstructs their practical applications in long-life lithium metal batteries. In this work, rubber-derived lithium-conducting elastomer has been developed via sulfur vulcanization of nitrile butadiene rubber with a polymerizable ionic liquid to provide both high resilience and dramatically improved ionic c ...[more]

PMID: 35362198

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Project description:Safety and high-voltage operation are key metrics for advanced, solid-state energy storage devices to power low- or zero-emission HEV or EV vehicles. In this study, we propose the modification of single-ion conducting polyelectrolytes by designing novel block copolymers, which combine one block responsible for high ionic conductivity and the second block for improved mechanical properties and outstanding electrochemical stability. To synthesize such block copolymers, the ring opening polymerization (ROP) of trimethylene carbonate (TMC) monomer by the RAFT-agent having a terminal hydroxyl group is used. It allows for the preparation of a poly(carbonate) macro-RAFT precursor that is subsequently applied in RAFT copolymerization of lithium 1-[3-(methacryloyloxy)propylsulfonyl]-1-(trifluoromethylsulfonyl)imide and poly(ethylene glycol) methyl ether methacrylate. The resulting single-ion conducting block copolymers show improved viscoelastic properties, good thermal stability (T onset up to 155 °C), sufficient ionic conductivity (up to 3.7 × 10-6 S cm-1 at 70 °C), and high lithium-ion transference number (0.91) to enable high power. Excellent plating/stripping ability with resistance to dendrite growth and outstanding electrochemical stability window (exceeding 4.8 V vs Li+/Li at 70 °C) are also achieved, along with enhanced compatibility with composite cathodes, both LiNiMnCoO2 - NMC and LiFePO4 - LFP, as well as the lithium metal anode. Lab-scale truly solid-state Li/LFP and Li/NMC lithium-metal cells assembled with the single-ion copolymer electrolyte demonstrate reversible and very stable cycling at 70 °C delivering high specific capacity (up to 145 and 118 mAh g-1, respectively, at a C/20 rate) and proper operation even at a higher current regime. Remarkably, the addition of a little amount of propylene carbonate (∼8 wt %) allows for stable, highly reversible cycling at a higher C-rate. These results represent an excellent achievement for a truly single-ion conducting solid-state polymer electrolyte, placing the obtained ionic block copolymers on top of polyelectrolytes with highest electrochemical stability and potentially enabling safe, practical Li-metal cells operating at high-voltage.

Dataset Information

A Highly Durable Rubber-Derived Lithium-Conducting Elastomer for Lithium Metal Batteries.

Publications

A Highly Durable Rubber-Derived Lithium-Conducting Elastomer for Lithium Metal Batteries.

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