Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 14, Pages 11663-11670Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b19692
Keywords
lithium ion battery; cathode material; LiNi1/3Co1/3Mn1/3O2; LiTi2(PO4)(3); coating
Funding
- National Natural, Science Foundation of China [51572151, 51772169, 51672158]
- Outstanding Youth Science and Technology Innovation Team Project of Hubei Educational Committee [T201603]
- FRC research grant of Sam Houston State University
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Layered LiNi1/3Co1/3Mn1/3O2 (NCM333) is successfully coated by fast ionic conductor LiTi2(PO4)(3) (LTP) via a wet chemical method. The effects of LTP on the physicochemical properties and electrochemical performance are studied. The results reveal that a highly layered structure of NCM333 can be well maintained with less cation mixing after LTP coating. LTP of about 5 nm thickness is coated on the surface of NCM333. Such an LTP coating layer can effectively suppress the side reactions between NCM333 and electrolyte but will not hinder the lithium ion transmission. As a result, LTP-coated NCM333 owns an improved capability and cyclic performance, for example, NCM333/LTP delivers an initial capacity as high as 121.0 mA h g(-1) with a capacity retention ratio of 82.3% after 200 cycles at 10 C, whereas NCM333 only has an initial capacity of 120.4 mA h g(-1) with a very low capacity retention ratio of 66.4%. This method of using a fast ionic conductor like LTP as a coating material may provide a simple and effective strategy to modify those electrode materials with poor cyclic performance.
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