Li4Ti5O12: A Visible-to-Infrared Broadband Electrochromic Material for Optical and Thermal Management

被引：180
作者：
Mandal, Jyotirmoy [1 ]
Du, Sicen [1 ]
Dontigny, Martin [2 ]
Zaghib, Karim [2 ]
Yu, Nanfang [1 ]
Yang, Yuan [1 ]
机构：
[1] Columbia Univ, Dept Appl Phys & Appl Math, Mudd 200,MC 4701,500 W 120 St, New York, NY 10027 USA
[2] IREQ Inst Rech Hydroquebec, 1800 Blvd Lionel Boulet, Varennes, PQ J3X 1S1, Canada
来源：
ADVANCED FUNCTIONAL MATERIALS | 2018年 / 28卷 / 36期
基金：
美国国家科学基金会;
关键词：
electrochromism; radiative cooling; solar heating; super-broadband; thermal camouflage; LITHIUM-ION BATTERIES; ALL-SOLID-STATE; TUNGSTEN-OXIDE; THIN-FILMS; NICKEL-OXIDE; DEVICES; LIGHT; ANODE; WO3; ELECTRODES;
D O I：
10.1002/adfm.201802180
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Broadband electrochromism from visible to infrared wavelengths is attractive for applications like smart windows, thermal camouflage, and temperature control. In this work, the broadband electrochromic properties of Li4Ti5O12 (LTO) and its suitability for infrared camouflage and thermoregulation are investigated. Upon Li+ intercalation, LTO changes from a wide bandgap semiconductor to a metal, causing LTO nanoparticles on metal to transition from a super-broadband optical reflector to a solar absorber and thermal emitter. Large tunabilities of 0.74, 0.68, and 0.30 are observed for the solar reflectance, mid-wave infrared (MWIR) emittance, and long-wave infrared (LWIR) emittance, respectively, with a tunability of 0.43 observed for a wavelength of 10 mu m. The values exceed, or are comparable to notable performances in the literature. A promising cycling stability is also observed. MWIR and LWIR thermography reveal that the emittance of LTO-based electrodes can be electrochemically tuned to conceal them amidst their environment. Moreover, under different sky conditions, LTO shows promising solar heating and subambient radiative cooling capabilities depending on the degree of lithiation and device design. The demonstrated capabilities of LTO make electrochromic devices based on LTO highly promising for infrared-camouflage applications in the defense sector, and for thermoregulation in space and terrestrial environments.
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页数：8
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