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09-22 

Talking about the anode material of lithium battery

1.Definition:Thenegativeelectrodematerialisthecarrieroflithiumionsandelectronsinthebatterychargingprocess,andplaystheroleofenergystorageandrelease.Inthecostofthebattery,thenegativeelectrodematerialaccountsforabout5%-15%,anditisoneoftheimportantrawmaterialsforlithium-ionbatteries.2.Asacarrierforlithiumioninsertion,theanodematerialmustmeetthefollowingrequirements:Theinsertionredoxpotentialoflithiumionsinthenegativeelectrodematrixisaslowaspossible,closetothepotentialofmetallithium,sothattheinputvoltageofthebatteryishigh;``Alargeamountoflithiuminthematrixcanbereversiblyinsertedanddeintercalatedtoobtainhighcapacity;Duringtheinsertion/de-embeddingprocess,themainstructureofthenegativeelectrodehaslittleornochange;TheredoxpotentialchangeswiththeinsertionandremovalofLishouldbeaslittleaspossible,sothatthevoltageofthebatterywillnotchangesignificantly,andstablecharginganddischargingcanbemaintained;Theinsertioncompoundshouldhavegoodelectronicconductivityandionicconductivity,sothatpolarizationcanbereducedandhighcurrentchargeanddischargecanbecarriedout;ThehostmaterialhasagoodsurfacestructureandcanformagoodSEIwiththeliquidelectrolyte;Theintercalationcompoundhasgoodchemicalstabilityintheentirevoltagerange,anddoesnotreactwithelectrolytesetc.aftertheformationofSEI;Lithiumionshavealargediffusioncoefficientinthemainmaterial,whichisconvenientforrapidcharginganddischarging;Fromapracticalpointofview,thematerialshouldbeeconomicalandenvironmentallyfriendly.Three,carbon-basedanode:Fourth,silicon-basedanodematerialsaremainlydividedintotwocategories:1,crystallinesiliconmaterial;advantage:highcapacity,(4200mAh/g(Li4.4Si)),Disadvantages:Thevolumeexpansioncanreach300%,whichwillnotonlycausetheparticlesoftheSianodetobreak,butalsodamagetheconductivenetworkandbindernetworkoftheelectrode,resultinginthelossofactivematerials,whichwillseriouslyaffectthecycleperformanceofthesiliconanodematerial.TherearethreemainideasforsolvingtheproblemoflargevolumeexpansionofSimaterials:1)Nanometerization:Nanoparticlescanreducethedamageofthematerialparticlesandelectrodescausedbyvolumeexpansion,buttheyarelargerthanthetableandaffectthefirsteffect;andthemethodhasahighcost,acomplicatedprocess,andadifficultpreparation.2)Sicrystalmaterialswithspecialshapes,suchashoneycombmaterialsanddendriticSimaterials,usethedeformationoftheSimaterialitselftoabsorbthevolumechangeduringcharginganddischargingandimprovethecycleperformanceoftheSimaterial;butthecompactiondensityissmall,andtheprocessTheprocessiscomplicatedandthepreparationisdifficult.3)Si/Ccompositematerial,throughthecombinationofSiandgraphitematerial,thegraphitematerialisusedtobufferthevolumechangeoftheSimaterialduringthecycle,soastoimprovethecycleperformanceoftheSimaterial.Althoughtheexpansionspaceisreservedandthecycleperformanceisimproved,thecompactiondensityissmallandtheindustrializationisdifficult.Atpresent,scholarsatCentralSouthUniversityhavepreparedacompositeSianodematerialofsilicon,graphite,carbonnanotubesandpitchbyspraydrying.2,siliconoxidematerialSiliconoxide:Thevolumeexpansionissmall,butthefirsteffectistoolow.ThevolumeexpansionofSiOxmaterialismuchsmallerthanthatofcrystallinesiliconmaterial,butitsexpansionlevelisstillmuchhigherthanthatofgraphitematerials.Therefore,thedevelopmentofSiOxmaterialstillneedstofocusonthevolumeexpansionproblemtoreducethematerialparticlecrushingandpulverizationduringthecycle.,Improvethecyclelifeofthematerial.Therefore,nanoizationisalsoacommonmethodforSiOxmaterials;thereisalsotheuseofhigh-energyballmillingtotreatSiOxmaterials,reducingtheparticlesizeofSiOxmaterials,therebyimprovingthecycleandrateperformanceofthematerial,butthefirstefficiencyofthematerialisonly63%.InordertosubstantiallyimprovetheefficiencyofSiOxmaterialsforthefirsttime,KAISTdevelopedaSi-SiOx-Ccompositestructuresiliconanodematerial.NanoSiparticlesaredispersedinSiOxparticles,andthesurfaceoftheparticlesiscoveredwithalayerofporousCarbonmaterial.Electrochemicaltestsshowthatthematerialhasexcellentelectrochemicalperformance,withareversiblecapacityof1561.9mAh/gat0.06C,afirstefficiencyof80.2%,100cyclesof1C,andacapacityretentionrateof87.9%.5.LithiummetalanodematerialMetallithiumisoneofthemetalswiththelowestdensity.Thestandardelectrodepotentialis-3.04Vandthetheoreticalspecificcapacityis3860mAh/g.Fromthisdata,itissecondonlyto4200mAh/gofsilicon.Applicationareas:Lithium-sulfurbattery(2600wh/kg),lithium-airbattery(11680wh/kg),etc.Lithiummetalbatterieshavehighcapacityperformance,butinuse,duetothepresenceoflithiumdendrites,negativeelectrodeprecipitation,negativenegativesidereactions,whichseriouslyaffectthesafetyofthebattery,itisintheconceptualstageatthisstage.Lithium-sulfurbattery.Sulfurisalsoaverywidespreadelementinnature.Thehigherenergydensity(2600wh/kg)oflithium-sulfurbatteriesmaybethefocusofthenextgenerationoflithiumbatteryresearchanddevelopment.Lithium-airbattery.Lithium-airbatteryhasaveryhighenergydensity(11680wh/kg),whichisclosetotheenergydensityoffuel,andisenvironmentallyfriendly.Thereactionproductiswater.VI.Lithiumtitanateanodemater

09-22 

Analysis of the market status and development prospects of the lithium battery anode material industry: natural graphite vs. artificial graphite, who has more potential?

The core data of this article: natural graphite and artificial graphite shipments, lithium battery anode material market structure, natural graphite and artificial graphite prices, artificial graphite competition pattern, artificial graphite cost structure

09-22 

What are the anode materials for lithium batteries?

At present, the anode materials actually used in lithium-ion batteries are basically carbon materials, such as artificial graphite, natural graphite, mesophase carbon microspheres, petroleum coke, carbon fiber, pyrolytic resin carbon, etc.

09-03 

Warmly celebrate the website of Hunan Yide New Energy Technology Co., Ltd.! ! !

Hunan Yide New Energy Technology Co., Ltd. was established in May 2019. The company is located in Shaoshan, the hometown of a great man Chairman Mao. The project is located in the standardized factory building of the Shuangchuang Demonstration Base in Shaoshan High-tech Zone. It is a company specializing in the research and development of lithium battery anode materials. High-tech enterprise with production.