Li4Ti5O12(LTO)anode material demonstrates superior cycling performance due to its stable spinel struc-ture and high lithiation/de-lithiation potential.Herein,a novel energy-saving solid-phase synthesis route for LTO has been successfully designed,employing the cheap industrial intermediate product of metati-tanic acid(HTO)as titanium source.Through the in-situ Fourier transform infrared spectroscopy(FTIR)and ex-situ X-ray diffraction(XRD),it is revealed for the first time that the amorphous crystal structure of HTO is more conducive for the Li+insertion,making it possible to prepare LTO at a relatively lower sin-tering temperature.Utilizing the dehydration carbonization reaction between glucose and sulfuric acid,an ingenious strategy of glucose pre-coating is adopted to avoid the generation of Li2SO4 impurity caused by the residual sulfuric acid on the surface of HTO,which meanwhile enhances the conductivity and inhi-bits the particle growth of LTO.The obtained ALTO@C anode material consequently exhibits excellent electrochemical performance that 132.0 mAh g-1 is remained even at 20 C,and ultra low decay rate of 0.015％per cycle is achieved during 1000 cycles at 2 C.Remarkably,LiCoO2//ALTO@C full cell delivers con-spicuous low-temperature property(130.7 mAh g-1 at 0.5 C and almost no attenuation after 300 cycles under-20℃).

Guochuan Wang;Hongmei Wang;Guangqiang Ma;Xinhe Du;Liyu Du;Peng Jing;Yanqing Wang;Kaipeng Wu;Hao Wu;Qian Wang;Yun Zhang

Department of Advanced Energy Materials,College of Materials Science and Engineering,Sichuan University,Chengdu 610064,Sichuan,China;School of Biological and Chemical Engineering,Panzhihua University,Panzhihua 617000,Sichuan,China;College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,Sichuan,China;Engineering Research Center of Alternative Energy Materials&Devices,Ministry of Education,Sichuan University,Chengdu 610064,Sichuan,China

能源化学

[1]Guochuan Wang;Hongmei Wang;Guangqiang Ma;Xinhe Du;Liyu Du;Peng Jing;Yanqing Wang;Kaipeng Wu;Hao Wu;Qian Wang;Yun Zhang-.Investigation on process mechanism of a novel energy-saving synthesis for high performance Li4Ti5O12 anode material)[J].能源化学,2022(07):266-275

metati,tanic,ALTO,spicuous

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