li4ti5o12
198344615
Facile preparation of core shell Si@Li4Ti5O12 nanocomposite as large capacity lithium ion battery anode
Abstract As a promising alternative anode material, silicon (Si) presents a larger capacity than the commercial anode to achieve large capacity lithium ion batteries. However, the application of pure Si as anode is hampered by limitations such as volume expansion, low conductivity and unstable solid electrolyte interphase. To break through these limitations, the core shell Si@Li4Ti5O12 nanocomposite, which was prepared via in situ self assembly reaction and decompressive boiling fast concentration method, was proposed in this work. This anode combines the advantages of nano sized Si particle and pure Li4Ti5O12 (LTO) coating layer, improving the performance of the lithium ion batteries. The Si@Li4Ti5O12 anode displays a high initial discharge/charge specific capacity of 1756/1383 mAh g 1 at 500 mA g 1 (representing high initial coulombic efficiency of 78.8% a large rate capability (specific capacity of 620 mAh g 1 at 4000 mA g 1) an outstanding cycling stability (reversible specific capacity of 883 mAh g 1 after 150 cycles) and a low volume expansion rate (only 3.3% after 150 cycles) Moreover, the synthesis process shows the merits of efficiency, simplicity, and economy, providing a reliable method to fabricate large capacity Si@Li4Ti5O12 nanocomposite anode materials for practical lithium ion batteries.
Mengjing Liu Hanyang Gao Guo-xin Hu Kunxu Zhu Hao Huang
203937359
Unlock the potential of Li4Ti5O12 for high voltage/long cycling life and high safety batteries: Dual ion architecture superior to lithium ion storage
Abstract Li4Ti5O12 (LTO) has drawn great attention due to its safety and stability in lithium ion batteries (LIBs) However, high potential plateau at 1.5 V vs. Li reduces the cell voltage, leading to a limited use of LTO. Dual ion batteries (DIBs) can achieve high working voltage due to high intercalation potential of cathode. Herein, we propose a DIB configuration in which LTO is used as anode and the working voltage was 3.5 V. This DIB achieves a maximum specific energy of 140 Wh/kg at a specific power of 35 W/kg, and the specific power of 2933 W/kg can be obtained with a remaining specific energy of 11 Wh/kg. Traditional LIB material shows greatly improved properties in the DIB configuration. Thus, reversing its disadvantage leads to upgraded performance of batteries. Our configuration has also widened the horizon of materials for DIBs.
Xiaoyuan Shi Shansheng Yu Ting Deng Wei Zhang Wei-tao Zheng
211628826
Surface Engineered Li4Ti5O12 Nanostructures for High Power Li Ion Batteries
Highlights Surface engineered Li4Ti5O12 nanoparticles were synthesized by an off stoichiometric solvothermal process. The electrode exhibited ultrafast charge discharge (up to 1200C) performances in a half cell configuration. A full cell consisting of the engineered Li4Ti5O12 anode and LiMn2O4 cathode exhibited an ultrahigh rate capability (up to 200C) long cycling life (1000 cycles) and robust performances (at 10, 25, and 55 degC) Electronic supplementary material The online version of this article (10.1007/s40820 020 0366 x) contains supplementary material, which is available to authorized users.
Nano micro letters
Binitha Gangaja Shantikumar V Nair Dhamodaran Santhanagopalan
212699697
Li4Ti5O12/LiFePO4 Solid State Lithium Ion Full Cell with LithiatedNafion membrane
The present work studies the solid state lithium ion full cell Li4Ti5O12/LiFePO4 with propylene carbonate swollen lithiated Nafion membrane (Li Nafion) as both electrolyte and separator, and lithiated Nafion dispersion as a binder. The advantage of this cell is single ion lithium conductivity of the polymer electrolyte preventing its polarisation, as well as the absence of a liquid phase and negligible vapour pressure of the high boiling point plasticiser increasing the safety of the device. The galvanostatic charge/discharge tests examined the electrochemical performance of the full cell, as well as Li/Li4Ti5O12 and Li/LiFePO4 half cells. With a commonly used mass ratio of composite electrodes (active material/carbon black/binder of 80:10:10) the discharge capacity of the full cell Li4Ti5O12/LiNafion/LiFePO4 as studied for the first time was about 70 mAh g 1 at 50th charge discharge cycle at coulombic efficiency of 99% A more proper plasticiser and optimisation of the mass ratio of the components of the electrodes can render such a cell suitable for application in LIBs with enhanced safety.
Elizaveta Yu Evshchik
216260723
Featured properties of Li+ based battery anode: Li4Ti5O12
3D ternary Li4Ti5O12, a Li+ based battery anode, presents an unusual lattice symmetry (triclinic crystal) band structure, charge density, and density of states under first principles calculations. It is a large direct gap semiconductor with Edg 2.98 eV. The atom dominated valence and conduction bands, the spatial charge distribution and the atom and orbital decomposed van Hove singularities are available for delicate identifications of multi orbital hybridizations in Li O and Ti O bonds. The extremely non uniform chemical environment, which induces very complicated hopping integrals, directly arises from the large bonding fluctuations and the highly anisotropic configurations. Also, the developed theoretical framework is very useful for fully understanding cathodes and electrolytes of oxide compounds.
Thi Dieu Hien Nguyen Hai Duong Pham Shih-yang Lin Ming-Fa Lin
225546254
A low cost and Li rich organic coating on a Li4Ti5O12 anode material enabling Li ion battery cycling at subzero temperatures
In this paper, we report the surface modification of the Li4Ti5O12 (LTO) anode material with a freshly prepared Li rich PTCLi4 organic molecule using a spray dryer technique. In addition, burning the resulting powder yielded an electrode material with a few nanometer thick carbon coating. For comparison, carbon coated LTO powder was prepared with graphene oxide (GO) using the same protocol. Organic molecules were first characterized using FTIR, XPS, TGA, XRD, and SEM methods. PTCLi4 coated LTO powders were observed via SEM and the corresponding EDX mapping as well as micro Raman and XPS spectroscopic analyses confirmed the efficient surface coverage of the anode material. After the burning, a graphitic like carbon coating with an ID/IG of approximately 0.76 and a thickness of a few nanometers was confirmed by TEM observations. Thermogravimetric analyses revealed that the content of carbon varied from 0.3 to 1.5 wt% depending on the reaction conditions and material used (i.e. PTCLi4 or GO) Interestingly, electrochemical cycling at 25 degC of PTCLi4 coated LTO electrodes gave rise to superior performance compared to that of the pristine electrode, especially at high C rates, and carbon coated electrodes showed intermediate performance. Most importantly, the good cyclability of PTCLi4 coated LTO electrodes was observed with a specific capacity of 145 mA h g 1 after 100 cycles at a C/2 rate with an average coulombic efficiency of 100% XPS analyses performed on aged electrodes revealed a low degradation of the electrolyte with a lower concentration of LiF on the surface of the PTCLi4 coated LTO electrodes. Finally, the cycling of LTO electrodes demonstrated the potential of using the PTCLi4 coating to increase the Li ion transfer at the electrode electrolyte interface at subzero temperatures. In fact, the PTCLi4 coated LTO electrode delivered almost the same specific capacity at a C/2 rate when cycled at 20 degC as the pristine electrode cycled at 25 degC.
Nicolas Daniel Delaporte Pascale Chevallier Sylviane Rochon Gilles Lajoie Jean-Christophe Daigle Vincent Gariepy Daniel Clement Rene Veillette Marie Claude Mathieu Manon Provencher Michel L Trudeau Karim Zaghib
220607928
Sol Gel Synthesis of Nanocrystalline Mesoporous Li4Ti5O12 Thin Films as Anodes for Li Ion Microbatteries
The development of anodes based on Li4Ti5O12 (LTO) for lithium ion batteries has become very important in recent years on the basis that it allows a long service life (stability in charge discharge cycling) and safety improvements. The processing of this material in the form of thin film allows for greater control of its characteristics and an improvement of its disadvantages, namely reduced electrical conductivity and low diffusion of lithium ions. In this work, we try to limit these disadvantages through the synthesis of a mesostructured carbon doped Li4Ti5O12 thin film with a pure spinel phase using a combination of a block copolymer template and in situ synthesis of Li Ti double alkoxide. Structural and electrochemical characterization has been carried out to determine the best conditions (temperature, time, atmosphere) for the thermal treatment of the material to reach a compromise between crystallinity and porosity distribution (pore size, pore volume, and interconnectivity)
Nanomaterials
Jadra Mosa Mario Aparicio
224890084
Al Ions Doping Effect on The Diffusion Coefficient and Capacity of Li4Ti5O12 (Lithium Titanate, LTO) in Lithium Ion Battery Anode
Li4Ti5O12 (LTO) anode doped with Al ions with varying concentrations (Al 0; 0.005; 0.015; 0.03; 0.045) was successfully synthesized using the sol gel method. Al doped LTO samples were obtained through the sintering of gel at 850oC for 4 hours under a normal atmosphere. Electrochemical performance such as charge discharge capacity and diffusion coefficient were characterized using an automatic battery cycler. The cells consist of electrode sheets (LTO doping Al) as a working electrode, lithium metal as the counter electrode, Celgard film as the separator, and LiPF6 as an electrolyte. Cyclic voltammetry test results show that a greater scan rate results in decreased capacity and greater polarization voltage. In addition, an increase in concentrations used in Al doping on LTO causes capacity, and the diffusion coefficient tends to decrease.
Slamet Priyono Lufthansyah Daniswara Rahma Alfia Khoiri Yayuk Astuti
234450711
SINTESIS DAN KARAKTERISASI Li4Ti5O12 YANG DILAPISI KARBON DENGAN METODE SOLID STATE REACTION UNTUK ANODA ION LITHIUM
Telah dilakukan sintesis material anoda Li4Ti5O12 dilapisi karbon melalui metode solid state, dengan bahan baku LiOH H2O dan TiO2. sintesis dilakukan dengan variasi sumber karbon yaitu Super. P, Tapioka, dan karbon aktif Food grade. Prekursor Li4Ti5O12 disinter pada suhu 800 o C selama 4 jam pada atmosfer udara bebas. Sedangkan proses pelapisan karbon dilakukan dengan milling basah dan sinter pada suhu 600 o C selama 1 jam pada atmosfer N2. Karakterisasi yang dilakukan meliputi analisa untuk melihat perbedaan performa elektrokimia pada variasi sumber karbon yang digunakan, diantaranya analisa XRD (X ray Diffraction) untuk mengetahui pembentukan fasa Li4Ti5O12, FESEM Field Emission Scanning Electron Microscopy) untuk menganalisa morfologi yang terbentuk, dan untuk mengetahui performa elektrokimia dilakukan pengujian Cyclic voltammetry, charge discharge dan Electrochemical Impedance Spectroscopy (EIS) Hasil karaktrisasi terbentuk fasa Lithium titanium oxide (Li4Ti5O12) sebesar 96,1% dan fasa rutile (TiO2) sebesar 3,1% Hasil karakterisasi FE SEM menunjukan morfologi penyebaran karbon pada anoda Li4Ti5O12/C dengan sumber karbon Super P, paling homogen dbandingkan dengan anoda Li4Ti5O12/C dengan sumber karbon Tapioka kemudian anoda Li4Ti5O12/C dengan sumber karbon food grade. Performa elektrokimia yang dihasilkan Li4Ti5O12/C dengan sumber karbon Tapioka memiliki nilai konduktivitas elektronik dan konduktivitas ionik paling besar, dan menunjukan difusi ion lithium yang sangat kecil, namun memiliki nilai koefesien difusi 2,54 x 10 13 cm 2 s 1 mendekati besar koefesien difusi Li4Ti5O12/C (Sp) sebesar 2,61 x 10 13 cm 2 s 1 serta memiliki nilai kapasitas discharge 161.05 mAh/g, mendekati nilai kapasitas discharge Li4Ti5O12/C (Sp) sebesar 167.84 mAh/g.
Lediliocza Lediliocza Sitti Ahmiatri Saptari Slamet Priyono
226531217
Role of TiO2 Phase Composition Tuned by LiOH on The Electrochemical Performance of Dual Phase Li4Ti5O12 TiO2 Microrod as an Anode for Lithium Ion Battery
In this study, a dual phase Li4Ti5O12 TiO2 microrod was successfully prepared using a modified hydrothermal method and calcination process. The stoichiometry of LiOH as precursor was varied at mol ratio of 0.9, 1.1, and 1.3, to obtain the appropriate phase composition between TiO2 and Li4Ti5O12. Results show that TiO2 content has an important role in increasing the specific capacity of electrodes. The refinement of X ray diffraction patterns by Rietveld analysis confirm that increasing the LiOH stoichiometry suppresses the TiO2 phase. In the scanning electron microscopy images, the microrod morphology was formed after calcination with diameter sizes ranging from 142.34 to 260.62 nm and microrod lengths ranging from 5.03 7.37 mm. The 0.9 LiOH sample shows a prominent electrochemical performance with the largest specific capacity of 162.72 mAh/g and 98.75% retention capacity achieved at a rate capability test of 1 C. This finding can be attributed to the appropriate amount of TiO2 that induced the smaller crystallite size, and lower charge transfer resistance, enhancing the lithium ion insertion/extraction process and faster diffusion kinetics.
Lukman Noerochim Wahyu Caesarendra A M Habib Yatim lailun Ni'mah A Subhan Bambang Prihandoko Buyung Kosasih