c li2mnsio4 nanocomposite cathode material for li ion batteries

... which is beneficial for mechanical reinforcement and for enhancing electronic conduction These hollow nanocomposites deliver a stable capacity of about 210 mA h g-1 at a high rate of 4. 8C ( 1C denoted ... stable speci c capacity (a theoretical capacity of 372 mA h g-1, forming LiC6), small irreversible capacity, and good cycling performance Soft carbon materials exhibit a very high reversible Li- storage ... charge and discharge capacity Reproduced with the permission of American Chemical Society from [46] + a Voltage (V) versus Li/ Li As V2O5 is a typical cathode material for Li- ion batteries, we...

Ngày tải lên: 21/06/2014, 07:20

... specific capacity as a function of anode specific capacity (Cc is the cathode specific capacity) [89] 129 xx List of Acronyms BHF: Buffered Hydrogen Fluoride CE: Coulombic Efficiency CVD: ... the electrolyte when used in conjunction with nanostructured electrodes Chapter Literature Review 17 Figure 2.8: Electrolytes' Li Ionic conduction [1] 2.4 Cathodes for LIB Cathodes for LIB should ... without much crystallographic order [69] Li+ ion can be intercalated into graphitic carbon to form LiC6, intercalation compound resulting in a specific capacity close to the theoretical limit (372...

Ngày tải lên: 08/09/2015, 18:24

... charge/discharge profiles of the commercial Fe2 O3 powder and Fe2 O3 nanorod electrodes with 20%, 30%, and 40% conductive carbon content (b) The electrochemical cycling performance of microcrystalline ... nanorods for lithium ion diffusion Thus, the electrochemical performance of the one-dimensional nanostructured electrodes is remarkably enhanced Conclusion In summary, single crystalline ␣-Fe2 ... magnification view and (b) high resolution TEM image in the lithium ion intercalation/de-intercalation processes could remarkably improve the electrochemical performance of Fe2 O3 as an anode material...

Ngày tải lên: 19/03/2014, 16:48

... nanostructures can significantly improve the capacity, rate performance, and mechanical stability of the CoOxelectrode materials Conclusions A CuNFs@CoOxcomposite electrode was fabricated to ... → 4Li2 O + 3Co Co + Li2 O ↔ CoO + 2Li first discharge subsequent charge/discharge The first discharge process is an irreversible reaction of Co O and Li, which forms metallic Co and Li O phase ... microstructure of CuNFs@CoO x might be responsible for the increased reaction sites along the CuNF network, making the electrochemical reaction more efficient with Li ions, because the electrochemical...

Ngày tải lên: 21/06/2014, 04:20

... electrode : LiCoO2 Li1 -xCoO2 + xLi++ xe- Negative electrode : C+ xLi+ + xe- LixC Overall cell : LiCoO2 + C LixC + Li1 -xCoO2 Negative Electrode Positive Electrode Lix C6 Li1 -xCoO2 Figure 1-4 Scheme ... typical force curve (blackapproach curve and redretract curve) between an AFM silicon tip functionalized with CMC and a silicon wafer Right: plots of (c) the retracting force and (d) the retracting ... the conventional layered oxide LiCoO2 has been commercialized as the LIB cathode for twenty years, it can only deliver about 140mAh/g capacity which is half of its theoretical capacity Such limitation...

Ngày tải lên: 19/05/2016, 10:44

... NixCo1−xMoO4 nanowire electrodes Variation of the discharge (open circles)-charge (solid circles) specific capacity and coulombic efficiency versus the cycle number at a rate of C/ 5 for the NixCo1−xMoO4 ... reversible capacities of NixCo1−xMoO4 nanowire electrodes could be an evidence for delivering capacity by conversion mechanism Figure shows the specific capacity of NixCo1−xMoO4 nanowire electrodes ... molybdates have been focused on their application as anode materials for lithium -ion batteries because they could deliver high reversible capacity through a conversion reaction with lithium [19-21]...

Ngày tải lên: 20/06/2014, 21:20

... particular compositional ratio of the nanocomposite In fact, beyond this composition, the Li2 MnO3 content decreases, as seen from the XRD result The electrochemically inactive Li2 MnO3 in conjunction ... Electrochem Soc 1997, 144:1188-1194 Croguennec L, Deniard P, Brec R: Electrochemical cyclability of orthorhombic LiMnO2 J Electrochem Soc 1997, 144:3323-3330 Davidson IJ, McMillan RS, Murray JJ: Rechargeable ... Further, the enhanced electrochemical abilities of the Co-doped system may probably be due to the smaller particle sizes achieved by the coprecipitation process Conclusions In summary, structurally integrated...

Ngày tải lên: 20/06/2014, 23:20

... particular compositional ratio of the nanocomposite In fact, beyond this composition, the Li2 MnO3 content decreases, as seen from the XRD result The electrochemically inactive Li2 MnO3 in conjunction ... Electrochem Soc 1997, 144:1188-1194 Croguennec L, Deniard P, Brec R: Electrochemical cyclability of orthorhombic LiMnO2 J Electrochem Soc 1997, 144:3323-3330 Davidson IJ, McMillan RS, Murray JJ: Rechargeable ... Further, the enhanced electrochemical abilities of the Co-doped system may probably be due to the smaller particle sizes achieved by the coprecipitation process Conclusions In summary, structurally integrated...

Ngày tải lên: 21/06/2014, 17:20

... graphitic layer to the nanocrystallite surface 118 xiii List of abbreviations LIST OF ABBREVIATIONS 3D dimension CC-CV Constant current-constant voltage CE Coulombic efficiency CV Cyclic ... against C rate (d) Cycling performance of LiMnPO4 /C and LiMn0.7Fe0.3PO4 /C at 0.5 C 73 Figure 4.6 Cyclic voltammograms of (a) LiMnPO4 /C and (b) LiMn0.7Fe0.3PO4 /C at 0.05 mV/s (c) First cycle of charge ... of cycles CE  Qdisch arg e Qch arg e CE, Coulombic efficiency; 100% Qdisch arg e , discharge capacity; Qch arg e , charge capacity Chapter 2 Physical properties of LiMPO4 LiMPO4 phospho-olivines...

Ngày tải lên: 09/09/2015, 11:07

... xeeqn 1.8 Cathode half cell reaction: LiCoO2 xLi+ + xe- + C6 Anode half cell reaction: LixC6 eqn 1.9 Full Cell Reaction: LixC6 +Li1 -xCoO2 C6 + LiCoO2, E= 3.7 V at 25 C eqn 1.10 The process is reversed ... and form a lithium/carbon intercalation compound, LixCn This reversible faradaic reaction of lithiation/delithiation proceeds at less than 0.25 V versus Li/ Li+ , delivering reversible capacity ... discovery of low-voltage, lithium-intercalation, carbonaceous materials that are highly 10 reversible led to the commercialization of LixC6 /Li1 -xCoO2 cells by Sony in 1991.[11] Lithium -ion (Li- ion) ...

Ngày tải lên: 10/09/2015, 09:27

... Galvanostatic cycling 89 II.3.10.2 Cyclic voltammetry 90 II.3.10.3 Electrochemical Impedance Spectroscopy 91 II.3.10.3.1 Determination of Li- ion diffusion 94 coefficient from EIS References 96 Chapter ... 3.4.1 Li- cycling behavior of LiYMo3O8 and LiHoMo3O8 120 III.3.4.1.1 Galvanostatic cycling of LiYMo3O8 120 III.3.4.1.2 Galvanostatic cycling of LiHoMo3O8 123 III 3.4.1.3 Cyclic voltammetry of LiYMo3O8 ... Electrochemical Impedance Spectroscopy 215 V.7.4.1 Li- ion diffusion coefficient 220 V Summary and Conclusions 222 References 225 Chapter VI Nano- composites, SnO(VOx) as anodes for lithium ion batteries...

Ngày tải lên: 11/09/2015, 10:17

... performance of these new nanostructures as potential anode materials for the lithium -ion batteries All aspects of battery applications including specific capacity, rate capability, cyclability, ... electrodes customized for specific applications Chapter CHAPTER LITERATURE REVIEW This chapter is divided into two sections The first section introduces the technological background and the current ... most studied cathode materials for lithium ion batteries LiCoO2 is the most successful commercially because of its good cycle life (>500cycles) The main disadvantages of cobalt-based batteries are...

Ngày tải lên: 12/09/2015, 09:22

... select cycles are shown Cycle numbers are indicated 220 Fig 6.7 The charge-discharge capacities (corrected for uncoated and coated carbon contribution) as a function of cycle number (350 cycles) ... compound capable of storing and exchanging Li In conjunction with another non-metallic Li- accepting compound as cathode, the electrochemical cycling process would involve the transfer of Li- ions ... Li2 O Li4 .4Sn /Li2 O Li4 .4Sn / 2Li2 O Li1 .0Zn /Li2 O Li0 .6Cd /Li2 O Li4 .4Pb /Li2 O Li3 In /Li2 O Li3 Sb /Li2 O Li4 .4Sn/SiO2, Li2 O Li4 .4Sn / 3Li2 O Li4 .4Sn /Li- P-O matrix Capacity (mAh/g) First Reversible discharge...

Ngày tải lên: 16/09/2015, 08:32

... cyclic voltammetry and galvanostatic cycling Furthermore, the high-rate performance and long-term cycle stability of Li4 Ti5O12 anodes for use in Li- ion batteries were discussed Introduction Li4 Ti5O12 ... respectively, for the Li intercalation/deintercalation, in accordance with the pair of peaks reported for Li4 Ti5O12 powders [10] The following electrochemical reaction of Li4 Ti5O12 with Li has ... High Li electroactivity was confirmed by CV experiments The nano -Li4 Ti5O12 particles calcined at 700 C showed a high Li storage capacity of 128 mAh g−1 after 500 cycles at C and superior cycle...

Ngày tải lên: 20/06/2014, 23:20

... gravimetric and volumetric energy density, acceptable cyclability and rate capability are key issues facing scientists [3] Chapter 1.1 Basic Concepts of Rechargeable Li- ion Batteries Fig 1.1 Schematic ... the formation of Li 2CO3 species through surface regions of particles after the first activation, which could contribute to 24 Chapter capacity However, such kinetic process during formation ... 0.05 C cycle and the last 0.05 C cycle after 700 cycles at C rate, respectively Insets show the second and the 700 th charge and discharge cycles at C 57 Fig 3.12 Discharge capacity proportion...

Ngày tải lên: 10/09/2015, 09:28

... c u tr c tính chất điện hóa vật li u M c đích nghiên c u Chế tạo đƣ c vật li u composite C/ LiMn2O4 làm điện c c catot cho pin Li- ion Đối tƣợng nghiên c u Vật li u điện c c catot composite C/ LiMn2O4 ... C c pin thƣờng c c u tr c nhiều lớp (Hình 1.1a) nhƣ: CC1 | Li | IC | SI | CC2 Trong đó: CC1, CC2là tiếp c c; IC lớp dẫn ion; IS lớp tích trữ ion đóng vai trò điện c c dƣơng (catot); Li lớp liti ... điện c c không pha CNTs C c kết nghiên c u cho thấy vi c đƣa thêm CNTs vào điện c c LiMn2O4 c i thiện đáng kể tính chất đ c trƣng chúng c triển vọng vi c chế tạo pin liti ion 19 Chƣơng C C PHƢƠNG...

Ngày tải lên: 23/09/2015, 11:00

... charge-discharge with an acceptable capacity for energy storage applications 22     Figure 19 Rate performance of HAT in DOL/DME 3.3.5 Long cycle performance According to the rate performance, long cycles ... cycles because of the formation of SEI layer This could also be seen from the first cycle discharge capacity and its coulombic efficiency After 20 cycles, the charge-discharge performance becomes ... with acceptable capacity decrease The capacity retains about 230 mAh/g by 200 cycles Then a slight decrease occurs after 200 cycles The capacity retains 210 mAh/g after 500 cycles with 8.7% decrease,...

Ngày tải lên: 30/09/2015, 10:13

... lcc 3.5 gcc 2.7.2 Alpha OSF/1 3.2A lcc 4.0 gcc 2.6.3 cc MIPS R3000 IRIX 5.3 lcc 3.5 gcc 2.6.3 cc MIPS R3000 Ultrix 4.3 lcc 3.5 gcc 2.5.7 Pentium Windows 95 Windows NT 3.51 Microsoft Visual C/ C++ ... application-specific code for even these kinds of lowlevel components; it’s common, for example, to find applications in which the C library functions malloc and free have been replaced by custom ... Implementation C Interfaces and Implementations: Techniques for Creating Reusable Software C Interfaces and Implementations: Techniques for Creating Reusabl Prepared for frliu@microsoft.com, Frank Liu Copyright...

Ngày tải lên: 04/09/2013, 22:04

... đ c thả loại c trắm c , c chép, c mè, c rô phi Mỗi loại c nuôi c đ c điểm kh c trọng lợng, chất lợng thịt nên chúng đ c sử dụng vào vi c chế biến ăn kh c Cá trắm chép, thịt dày, xơng; c ... then mâm c vi c nhiều chí c nơi không Không thể nói vi c tiếp thu c ch chế biến ăn dân t c kh c không tốt, c c ch nấu ngon miệng bổ dỡng, nhng vi c tiếp thu phải c chừng m c, c chọn l c tiếp ... mòn), dũi (c m c y)là loại c n trùng sử dụng làm th c ăn 2.1.2 C ch chế biến c ch bảo quản th c phẩm * C ch chế biến C ch chế biến đồ ăn, th c uống vừa kỹ thuật, vừa nghệ thuật Phơng th c chế biến...

Ngày tải lên: 11/12/2013, 16:32

... Understanding implication - Understanding logical cohesion - Scanning for specific information - Understanding text structure - Grammar referencing - Skimming for gist - Lexical referencing - Understanding ... that TOEIC is a certificate for a job application and for graduation needs Question to and question to for students and teachers respectively refer to grammar and vocabulary learning and teaching ... presuppositions underling the text, recognising implications and making inferences, prediction, using all the clues available for both top-down and bottom-up strategies, including cohesion and rhetorical...

Ngày tải lên: 14/12/2013, 16:45