Superior lithium ion conduction of polymer electrolyte with comb-like structure via solvent-free copolymerization for bipolar all-solid-state lithium battery

Wei, Zhenyao1,2; Chen, Shaojie1; Wang, Junye1; Wang, Zhihao1; Zhang, Zhihua1,3; Yao, Xiayin1; Deng, Yonghong2; Xu, Xiaoxiong1

2018-07-21

10.1039/c8ta04477e

Journal of Materials Chemistry A   影响因子和分区

2050-7488

2050-7496

Here, novel solid polymer electrolytes were synthesized by solvent-free thiol-ene copolymerization with different chain lengths. It was demonstrated that the optimal polymer electrolyte exhibited excellent thermal stability up to 331 degrees C, considerable ionic conductivity of 5.05 x 10(-5) S cm(-1) at ambient temperature, a wide electrochemical window (0-5.05 V) and good compatibility with a lithium metal electrode. In addition, a solid-state monopolar LiFePO4//Li battery with an integrated cathode and electrolyte was assembled and delivered a maximum capacity of 167.39 mA h g(-1), which is close to the theoretical capacity of the LiFePO4 cathode. Moreover, the discharge capacity remained at 122.17 mA h g(-1) after 200 cycles at 60 degrees C, which represents a capacity retention of 75%. Remarkably, the monopolar cell could cycle well at room temperature, with a stabilized discharge capacity of 100 mA h g(-1) at 0.1C in the 60(th) cycle. In particular, taking advantage of the non-fluidity of solid electrolytes, a bipolar cell with a high voltage of 6.07 V was also assembled, which was extremely beneficial for improving the volumetric energy density and decreasing the cost, as well as enhancing the reliability of cell packs. The bipolar cell delivered an initial specific capacity of 136.3 mA h g(-1) with a retention of 76% after 40 cycles. Furthermore, the bipolar cell can work well under conditions of bending, cutting and even penetration by a nail. Consequently, this work provides an advanced strategy for the facile synthesis of polymer electrolytes, as well as the fabrication of bipolar cells with high voltages, which favors improvements in energy density.

SCI ; EI

英语

通讯

Natural Science Foundation of Guangdong Province[2016A030311031]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000438548800054

ROYAL SOC CHEMISTRY

20182905560867

C (programming language) ; Cathodes ; Copolymerization ; Electric discharges ; Ionic conduction in solids ; Iron compounds ; Lithium compounds ; Lithium-ion batteries ; Phosphorus compounds ; Solid electrolytes

Electricity: Basic Concepts and Phenomena:701.1 ; Computer Programming Languages:723.1.1 ; Chemical Agents and Basic Industrial Chemicals:803 ; Organic Polymers:815.1.1 ; Polymerization:815.2

Web of Science

1.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen 518055, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Wei, Zhenyao,Chen, Shaojie,Wang, Junye,et al. Superior lithium ion conduction of polymer electrolyte with comb-like structure via solvent-free copolymerization for bipolar all-solid-state lithium battery[J]. Journal of Materials Chemistry A,2018,6(27):13438-13447.

Wei, Zhenyao.,Chen, Shaojie.,Wang, Junye.,Wang, Zhihao.,Zhang, Zhihua.,...&Xu, Xiaoxiong.(2018).Superior lithium ion conduction of polymer electrolyte with comb-like structure via solvent-free copolymerization for bipolar all-solid-state lithium battery.Journal of Materials Chemistry A,6(27),13438-13447.

Wei, Zhenyao,et al."Superior lithium ion conduction of polymer electrolyte with comb-like structure via solvent-free copolymerization for bipolar all-solid-state lithium battery".Journal of Materials Chemistry A 6.27(2018):13438-13447.