TY - JOUR
T1 - Ultrathin Bilayer of Graphite/SiO2 as Solid Interface for Reviving Li Metal Anode
AU - Pathak, Rajesh
AU - Chen, Ke
AU - Gurung, Ashim
AU - Reza, Khan Mamun
AU - Bahrami, Behzad
AU - Wu, Fan
AU - Chaudhary, Ashraf
AU - Ghimire, Nabin
AU - Zhou, Bin
AU - Zhang, Wen Hua
AU - Zhou, Yue
AU - Qiao, Qiquan
N1 - Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Lithium metal anodes are expected to drive practical applications that require high energy-density storage. However, the direct use of metallic lithium causes safety concerns, low rate capabilities, and poor cycling performance due to unstable solid electrolyte interphase (SEI) and undesired lithium dendrite growth. To address these issues, a radio frequency sputtered graphite-SiO2 ultrathin bilayer on a Li metal chips is demonstrated, for the first time, as an effective SEI layer. This leads to a dendrite free uniform Li deposition to achieve a stable voltage profile and outstanding long hours plating/stripping compared to the bare Li. Compared to a bare Li anode, the graphite-SiO2 bilayer modified Li anode coupled with lithium nickel cobalt manganese oxide cathode (NMC111) and lithium titanate shows improved capacity retention, higher capacity at higher rates, longer cycling stability, and lower voltage hysteresis. Graphite acts as an electrical bridge between the plated Li and Li electrode, which lowers the impedance and buffers the volume expansion during Li plating/stripping. Adding an ultrathin SiO2 layer facilitates Li-ion diffusion and lithiation/delithiation, provides higher electrolyte affinity, higher chemical stability, and higher Young's modulus to suppress the Li dendrite growth.
AB - Lithium metal anodes are expected to drive practical applications that require high energy-density storage. However, the direct use of metallic lithium causes safety concerns, low rate capabilities, and poor cycling performance due to unstable solid electrolyte interphase (SEI) and undesired lithium dendrite growth. To address these issues, a radio frequency sputtered graphite-SiO2 ultrathin bilayer on a Li metal chips is demonstrated, for the first time, as an effective SEI layer. This leads to a dendrite free uniform Li deposition to achieve a stable voltage profile and outstanding long hours plating/stripping compared to the bare Li. Compared to a bare Li anode, the graphite-SiO2 bilayer modified Li anode coupled with lithium nickel cobalt manganese oxide cathode (NMC111) and lithium titanate shows improved capacity retention, higher capacity at higher rates, longer cycling stability, and lower voltage hysteresis. Graphite acts as an electrical bridge between the plated Li and Li electrode, which lowers the impedance and buffers the volume expansion during Li plating/stripping. Adding an ultrathin SiO2 layer facilitates Li-ion diffusion and lithiation/delithiation, provides higher electrolyte affinity, higher chemical stability, and higher Young's modulus to suppress the Li dendrite growth.
KW - RF sputtering
KW - graphite
KW - lithium metal batteries
KW - silicon dioxide
KW - thin films
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U2 - 10.1002/aenm.201901486
DO - 10.1002/aenm.201901486
M3 - Article
AN - SCOPUS:85070251244
SN - 1614-6832
VL - 9
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 36
M1 - 1901486
ER -