鋰硫電池PPT課件

1、Contents01020304Brief IntrodctionProblems & DirectionsLiterature SurveyDesign of Electrode Structure 第1頁/共15頁Great ProspectsBrief IntrodctionEnvironmental and energy issuesGreen energy storage deviceSolutionPractical specific energies for some rechargeable batteries, alo n g wi t h estimated dri

2、ving distances and pack prices.Nature Materials. 2012, 11 (1), 19-29 第2頁/共15頁PrincipleBrief Introdction(a) Illustration of the charge-discharge process in rechargeable Li-S batteries and (b) the formation of soluble intermediate products (Li2S8, Li2S6, Li2S4) and insoluble Li2S2/Li2S in the redox pr

3、ocess of S8 cathode.The Reversible Reaction: A representative dischargecharge voltage profle of a LiS cell, showing sequential formation of lithium polysulfdes at different redox stages. Nat Energy 2016, 1(9):16132Acc Chem Res 2013, 46(5):1125第3頁/共15頁Charge & Discharge ProcessBrief Introdction（1

4、）（2）（3）（4）Anodic reaction process：S8Li2S8Li2S6Li2S4Li2S2/Li2STwo discharge platforms(1:3)Typical lithium-sulfur battery for the first charge and discharge cycleProcess 1:S8Li2S8; Platform voltage:2.3 2.2VProcess 2:Li2S8 Li2Sn; Viscosity MaxProcess 3: Li2Sn Li2S2/Li2S2; Platform voltage:2.1 1.9V Main

5、 contributor to the capacityProcess 4:Li2S2 Li2S; Both nonconductive(s) Severe polarization（5）PolysulfideAnodeNegative electrodediffuseProcess 6:Shuttle Effect（6）（7）1、Loss of sulfur2、Consumption of Lithium3、Battery polarizationIn the negative, polysulfide can also be reduced第4頁/共15頁John B. Goodenoug

6、hHot StuffArumugam ManthiramQiang ZhangYi CuiBrief Introdction第5頁/共15頁Published PapersAdv Energy Mater 2014, 4 (7), 1301473 ACS Nano 2014, 8(9), 92959303 Nano Energy 2014, 9, 229236. Nanoscale 2014, 6 (3), 16531660 Adv.Mater. 2014, 26 (38),66226628. Nano.Energy. 2014, 5, 97104. Patent*3Brief Introdc

7、tion第6頁/共15頁Poor conductivityShuttle effectVolume expansionDendritesDiaphragm modificationProblems（5.010-30 S cm-1 at 25）Internal resistanceLow energy densityApertureConductive carbon Li+ transport capacityElectrode surface modificationElectrode structure designCost increase（Al2O3、nafion）Complex pro

8、cessNanoscale mixingNegative protective film（SEI、polish）ElectrolyteNot consideredProblemsDirections第7頁/共15頁Electrode structure CMK-3/S Nature Materials 2009, 8 (6), 500-506 （a）A schematic diagram of sulfur (yellow) confined within the interconnected pore structure of mesoporous carbon (CMK-3). （b）TE

9、M1、Highly ordered Stable structure2、Capillary complex sulfur(at 155)3、Use PEG to coatCycling performance of CMK-3/S modified with PEG (upper points, in black) versus CMK-3/S (lower points, in red) at a rate of 168 mA/g at room temperatureabSpecific capacity is greatly improved compared to before第8頁/

10、共15頁GrapheneElectrode structure Schematic graphenesulfur composites: (a) graphene-wrapped sulfur particle and (b) sulfur molecules (S8) dispersed on graphene sheetsSEM image (a), STEM bright field image (b) and the corresponding elemental mapping for S (c) reveal a homogeneous sulfur coating on the

11、graphene sheets. (d) Raman spectrum of the graphenesulfur composite.Energ Environ Sci 2013, 6 (4), 1283-1289 A mixture of pyrolytic graphite and sulfur is treated with high energy ball milling.第9頁/共15頁YolkShell Electrode structure (a) STiO2 yolkshell nanostructures. (b) SEM image and (c) TEM image.C

12、apacity retention of STiO2 yolkshell nanostructures cycled at 0.5 CNat Commun 2013 , 4 (4) :1331 Represents the best performance for long-cycle lithiumsulphur batteries.Coat sulphur nanoparticles with TiO2 to form STiO2 coreshell nanostructures, followed by partial dissolution of sulphur in toluene.

13、第10頁/共15頁AdvancesYolkShell in 2017 Template （500nm）Particle size（ 1nm）S-Volume（70%80%）Coulumbic Efficiency（99%）Small 2017, 13, 1700087Nano Energy 38 (2017) 1218Nano Energy 38 (2017) 239248AFM 2017, 27, 1702524How about carbon nanotubes 第11頁/共15頁AdvancesCNTs from 2012 to 2014Anode Current(mA/g)Number

14、 of cyclesCapacity(mAh/g)Capacityretention (%)Ref.MWCNTs/ S (80wt%)1.52.5 V 60675 J.Power Sources 2009, 189 (2), 1141-1146SWCNTs/S1.0C100550Part Part Syst Char 2013, 30 (2), 158-165 Vertical aligned CNTs/S (90wt%)1.0-3.0 V 20800J.Power Sources 2012, 213, 239-248第12頁/共15頁Coating MaterialLiterature SurveyPE