Journal
JOURNAL OF POWER SOURCES
Volume 542, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231797
Keywords
Solid-state lithium metal batteries; Block copolymer electrolytes; Pentablock copolymers; Inorganic-polymer composite electrolytes; Stable interface
Funding
- Special Fund of Key Technology Research and Development Projects [20180201097GX, 20180201099GX, 20180201096GX]
- Jilin Province Science and Technology Department
- Key Subject Construction of Physical Chemistry of Northeast Normal University
- R & D program of power batteries with low temperature and high energy , Science and Technology Bureau of Changchun [19SS013]
- National Key R & D Program of China [2016YFB0100500]
- Fundamental Research Funds for the Central Universities [2412019FZ015]
- Natural Science Foundation of the Jilin Province Education department [JJKH20201168KJ]
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The demand for lithium-ion batteries with high safety and high energy density has led to research on solid electrolytes. Composite solid electrolytes (CSEs) are a combination of inorganic solid electrolytes and polymer electrolytes, and have shown improved ionic conductivity and lithium ion transfer capacity. By incorporating LLZTO nanoparticles into a polymer matrix, a novel CSE with high lithium ion conductivity and electrochemical stability was successfully fabricated.
The demand for lithium-ion batteries with high safety and high energy density is leading a research boom in solid electrolytes. Composite solid electrolytes (CSEs), which combine the advantages of inorganic solid electrolytes and polymer electrolytes, have recently been intensively investigated. Herein, a novel CSE is fabricated by incorporating Li6.4La3Zr1.4Ta0.6O12 (LLZTO) nanoparticles into a polystyrene-poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)-polystyrene (PS-PEO-PPO-PEO-PS) pentablock copolymer matrix. The addition of LLZTO not only improves the ionic conductivity of the CSE by reducing the degree of crystallinity of PS-PEOPPO-PEO-PS, but also provides an additional transport channel for lithium-ions. As a result, the CSE with an optimal LLZTO content of 30 wt% shows an ionic conductivity of 3.10 x 10-4 S cm- 1 (28 degrees C). In addition, the CSE exhibits an electrochemical stability window of 5.1 V and a lithium ion transfer number of 0.36 at 28 degrees C. The low interfacial impedance indicates the formation of a stable interface between the CSE and the electrodes. Thus, LiFePO4/Li cells prepared using the CSE deliver high discharge capacity of 151.2 mA h g-1 with capacity retention of 95.7% after 160 cycles at 0.1C. These results demonstrate the promise of the combination of block copolymer/lithium garnet composite electrolytes for practical applications in solid lithium-ion batteries.
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