期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 25, 页码 13952-13959出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b02846
关键词
germanium oxide; graphene composite; anode material; lithium-ion battery; spray pyrolysis
资金
- Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning
- Ministry of Trade, Industry & Energy, Republic of Korea [201320200000420]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20132020000420] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Amorphous GeOx-coated reduced graphene oxide (rGO) balls with sandwich structure are prepared via a spray-pyrolysis process using polystyrene (PS) nanobeads as sacrificial templates. This sandwich structure is formed by uniformly coating the exterior and interior of few-layer rGO with amorphous GeOx layers. X-ray photoelectron spectroscopy analysis reveals a Ge:O stoichiometry ratio of 1:1.7. The amorphous GeOx-coated rGO balls with sandwich structure have low charge-transfer resistance and fast Li+-ion diffusion rate. For example, at a current density of 2 A g(-1), the GeOx-coated rGO balls with sandwich and filled structures and the commercial GeO2 powders exhibit initial charge capacities of 795, 651, and 634 mA h g(-1), respectively; the corresponding 700th-cycle charge capacities are 758, 579, and 361 mA h g(-1). In addition, at a current density of 5 A g(-1), the rGO balls with sandwich structure have a 1600th-cycle reversible charge capacity of 629 mA h g(-1) and a corresponding capacity retention of 90.7%, as measured from the maximum reversible capacity at the 100th cycle.
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