期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 5, 期 6, 页码 4785-4792出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b00196
关键词
Sodium-ion batteries; Cathodes; Na-rich layered oxide; Capacity; Cycle life
资金
- Chongqing University
- Fundamental Research Funds for the Central Universities [0241005202014, 0903005203403]
- National Natural Science Foundation of China [11632004, 51572182, 11372104, 11372363, 11332013, 5121543, 21503025]
- Key Program for International Science and Technology Cooperation Projects of the Ministry of Science and Technology of China [2016YFE0125900]
- National University of Singapore
- National Research Foundation
- Prime Minister's Office, Singapore under Competitive Research Programme (CRP Award) [NRF-CRP 8-2011-04]
The renewed interest in sodium-ion batteries reflects the persistent concern about the lithium resources that have widespread applications but an uneven distribution, and the overwhelming need for large-scale energy storage. Most exploration has focused on the conventional layered oxides NaxMO2 that stem from lithium-ion cathodes. However, exploring cathode materials with high capacities, long cycle, lives, and low costs because of the large ionic radius and high atomic weight of sodium is a great challenge. Here we report a Na-rich layered oxide, yttrium-doped Na2ZrO3, that serves as a cathode material in sodium ion batteries. This material delivers a large reversible capacity of similar to 180 mAh g(-1) and a good cycle life with no sign of obvious capacity decay over 1500 cycles along with a low cost. The redox reactivity of oxygen is shown to be involved in the sodium extraction insertion processes. This work not only provides a cathode contender to conventional layered oxides NaxMO2 but also suggests that broad classes of defective Na-rich layered oxides could be discovered.
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