Preparations And Performances Of LiNi_1/3Co_1/3Mn_1/3O₂and TiO₂Storage Material For Lithium Ion-Battery

due to low irreversible capacity and good cycling performance is widely used in commercial of lithium-ion batteries.But because LiCoO2expensive and the limited capacity prompted the researchers to look for alternative materials.Layered LiNiO2, spinel LiMn2O4and olivine LiFePO4have been synthesised out successfully for lithium ion battery.the synthesis of stoichiometric LiNiO? is hard,but in cyclic process structure is not quite stable.LiMn2O4shows severe capacity fading caused by Jahn-Teller distortion. Although olivine structure of LiFePO4thermal stability is good, but the high-rate performance is not ideal. Recently, many researchers have been dedicated to the study of high capacity, circulation performance and security performance for the layer of compound Li-Ni-Co-Mn-O.In this paper, LiNi1/3Co1/3Mn1/302was fabricated by the liquid phrase carbonate coprecipitation and sol-gel precipitation,we optimize the process conditions, do a simple comparison between the liquid phrase carbonate coprecipitation and sol-gel process.Surface modifications of material by metal oxide coating were adopted to improve the electrochemical perforance of the materia.ICP test results indicated that the most appropriate total precipitation pH value for8, get precursor body element distribution even.The optimal condition to synthesize, calcination at850℃for12h after precalcination at500℃for5h in air.Results demonstrated that the materials synthesized by multi-step calcination showed better electrochemical performanc.Through,the electrochemical performance tests, pH value for8and in850℃calcining12h quenching get products electrochemical performance is the best. The initial discharge capacity of the prepared LiNi1/3Co1/3Mn1/3O2was168mAh-g-1at0.1C the rate capabilitiy the voltage range of2.5-4.5V and the capacity retention after30cycles was84.8%. Surface modifications of LiCo1/3Ni1/3Mn1/3O2were studied.LiCo1/3Ni1/3Mn1/3O2coated by Al2O3was171.6mAh·g-1at0.1C the rate capabilitiy the voltage range of2.5-4.5V after30cycles and the capacity retention was98.6%. Rate performance of LiCo1/3Ni1/3Mn1/3O2coated by Al2O3was improved. This are identical with the improved diffusion coefficient of lithium-ion.The sample prepared by the liquid phrase carbonate coprecipitation and sol-gel process present good characteristics of α-NaFeO2layered structure. There is no undesirablecation mixing.LiNi1/3Co1/3Mn1/3O2powders prepared by carbonate coprecipitation have particles with micron grade while the LiNi1/3Co1/3Mn1/3O2powders synthesized by sol-gel process have have particles with nano grade.The initial discharge capacity was166mAh-g"1at0.1C the rate capabilitiy the voltage range of2.5-4.5V and the capacity after30cycles was94%.Titania(TiO2) has attracted much attention as an anode materialfor Li-ion batteries because it has potentially high-powerelectrode property. Tri-constituent co-assembly method have been investigated to prepre carbon-titania composites,in order to overcome poor electrical conductivity and low diffusion coefficient of Li-ions in TiO2. We have investigated the Li-ion battery anode properties of different content of Phenolic resin of carbon and titanium dioxides.