期刊
JOURNAL OF POWER SOURCES
卷 405, 期 -, 页码 7-17出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.10.030
关键词
Li metal batteries; moS(2); Composite polymer electrolyte; Fire resistant; Li dendrite suppressing
资金
- National Natural Science Foundation of China [51673076]
Uncontrollable lithium (Li) dendrite growth has hampered the application of lithium metal batteries (LMBs). Herein, a novel plastic crystal composite polymer electrolyte (nh-CPE) consisting of multifunctional two-dimensional (2D) molybdenum disulfide (MoS2) and ion-conducting one-dimensional (1D) surfactant oxidized cellulose nanocrystal (OCNC) is developed to overcome this challenge. The nh-CPE possesses good Li-dendrite suppressing ability, which is attributed to the well-designed three-dimensional (3D) ion conducting network constructed by homogeneously dispersed MoS2 and OCNC. This structure facilitates Li-ion conductivity and enables uniform Li deposition on the anode. Moreover, the impermeable MoS2 nano-flakes with excellent mechanical strength serve as physical barriers to hold the electrolyte-electrode interface stability and consequently block Li dendrite growth and enhance fire retardancy. When applied in LMB, the nh-CPE exhibits excellent cycle performance and rate capability, with 90% capacity retention after 200 cycles at 0.5 degrees C and 60 degrees C, and a discharge capacity of 128 mAh g(-1) at 1 C. Notably, owing to high room-temperature ionic conductivity (0.8 mS cm(-1)), the cell with nh-CPE cycled at room temperature delivers an initial discharge capacity of 144 mAh g(-1). The outstanding performance and simple process offer great opportunity to promote Li-dendrite-suppressing LMBs for practical application.
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