Journal
NANO LETTERS
Volume 15, Issue 5, Pages 3398-3402Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00739
Keywords
Li dendrite; solid-like electrolyte; superior conductivity; hollow nanoarchitecture; nanoconfinement
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Funding
- U.S. Department of Energy's Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
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The growth and proliferation of lithium (Li) dendrites during cell recharge are currently unavoidable, which seriously hinders the development and application Of rechargeable Li metal batteries. Solid electrolytes, with robust mechanical modulus are regarded as a promising approach to overcome the dendrite problems. However, their room-temperature ionic conductivities are usually too low to reach the level required for normal battery operation. Here, a class of novel solid electrolytes with liquid-like room-temperature ionic conductivities (>1 mS cm(-1)) has been successfully synthesized by taking advantage of the unique nanoarchitectures of hollow,silica (HS), spheres to confine liquid electrolytes in hollow space to afford high, conductivities (2.5 mS cm(-1)). In a symmetric lithium/lithium cell, the solid-like electrolytes demonstrate a robust performance against the Li dendrite problem, preventing the cell from short circuiting at current densities ranging from, 0.16 to 0.32 mA cm(-2) over an extended period of time. Moreover, the high flexibility and compatibility of HS nono-architectures, in principle, enables broad tunability to choose desired liquids for the fabrication of other kinds of solid like electrolytes, such as those containing Na+, Mg2+, or Al3+ as conductive media, providing a useful alternative strategy for the development of next generation rechargeable batteries.
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