期刊
NANO LETTERS
卷 14, 期 8, 页码 4852-4858出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl502192p
关键词
Lithium-ion battery; tin oxide; nanowire; atomic layer deposition; battery anode
类别
资金
- SERC Public Sector Research Funding [1121202012]
- Agency for Science, Technology, and Research (A*STAR)
- joint Singaporean-German Research Projects [SGP-PROG-021]
- MOE under AcRF Tier 2 [ARC 26/13, MOE2013-T2-1-034]
- AcRF Tier 1 [RG 61/12, RGT18/13, RG5/13]
- Start-Up Grant in Singapore [M4080865.070]
- National Research Foundation, Prime Minister's Office, Singapore
SnO2 nanowires directly grown on flexible substrates can be a good electrode for a lithium ion battery. However, Sn-based (metal Sn or SnO2) anode materials always suffer from poor stability due to a large volume expansion during cycling. In this work, we utilize atomic layer deposition (ALD) to surface engineer SnO2 nanowires, resulting in a new type of hollowed SnO2-in-TiO2 wire-in-tube nanostructure. This structure has radically improved rate capability and cycling stability compared to both bare SnO2 nanowires and solid SnO2@TiO2 core-shell nanowire electrodes. Typically a relatively stable capacity of 393.3 mAh/g has been achieved after 1000 charge-discharge cycles at a current density of 400 mA/g, and 241.2 mAh/g at 3200 mA/g. It is believed that the uniform hollow TiO2 shell provides stable surface protection and the appropriate-sized gap effectively accommodates the expansion of the interior SnO2 nanowire. This ALD-enabled method should be general to many other battery anode and cathode materials, providing a new and highly reproducible and controllable technique for improving battery performance.
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