期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 52, 页码 13815-13820出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201801809
关键词
electrochemistry; electrode-stabilizing agent; layered oxides; lithium; lithium-ion batteries; sacrificial salts
资金
- Ministry of Science and Technology of China [2015CB251103]
- National Natural Science Foundation of China [51472104, 21473075]
- Jilin Provincial Science and Technology Department [20150204078GX]
- Graduate Innovation Fund of Jilin University [2017040]
Li2CO3-passivated Li3N with high stability is prepared by aging Li3N powder in dry air, and is then used as an electrode additive for a Li(Li0.18Ni0.15Co0.15Mn0.52)O-2 (LLMO) cathode material. The material shows a large irreversible capacity of 800mAhg(-1) during the first charge, with the formation of a Li2N intermediate product. Acting as a Li+ sacrificial salt for a LLMO(+)/graphite(-) Li-ion battery, 2wt% Li3N results in a 10% increase in discharge capacity. The Li2N intermediate product reacts with the electrolyte, forming a uniform and regular surface film on the cathode. Moreover, chemical bonding between LLMO and N improves the electrode stability, resulting in excellent electrochemical performance.
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