材料科学
电解质
双层
石墨
化学工程
锂(药物)
电镀(地质)
阴极
阳极
电极
复合材料
膜
地质学
工程类
内分泌学
物理化学
化学
生物
医学
遗传学
地球物理学
作者
Rajesh Pathak,Ke Chen,Ashim Gurung,Khan Mamun Reza,Behzad Bahrami,Fan Wu,Ashraf Chaudhary,Nabin Ghimire,Bin Zhou,Wenhua Zhang,Yue Zhou,Qiquan Qiao
标识
DOI:10.1002/aenm.201901486
摘要
Abstract 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‐SiO 2 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‐SiO 2 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 SiO 2 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.
科研通智能强力驱动
Strongly Powered by AbleSci AI