期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 50, 页码 27934-27939出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b10207
关键词
Li4Ti5O12; nickel oxide; lithium rechargeable battery; solid electrolyte interphase (SEI); surface coating
资金
- LG Chem. Co., Ltd.
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2012M1A2A2671807]
- National Research Foundation of Korea [2012M1A2A2671807] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Li4Ti5O12 is a promising anode material for rechargeable lithium batteries due to its well-known zero strain and superb kinetic properties. However, Li4Ti5O12 shows low energy density above 1 V vs Li+/Li. In order to improve the energy density of Li4Ti5O12, its low-voltage intercalation behavior beyond Li4Ti5O12 has been demonstrated. In this approach, the extended voltage window is accompanied by the :decomposition of liquid electrolyte below 1 V, which would lead to an excessive formation of solid electrolyte interphase (SET) films. We demonstrate an effective method to improve electrochemical performance of Li4Ti5O12 in a wide working voltage range by coating Li4Ti5O12 powder with p-type semiconductor NiOx. Ex situ XRD, XPS, and FTIR results show that the NiOx coating suppresses electrochemical reduction reactions of the organic SET components to Li2CO3, thereby promoting reversibility of the charge/discharge process. The NiOx coating layer offers a stable SEI film for enhanced rate :capability and cyclability.
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