| Spinel Li Cr Ti O4,Li Fe Ti O4,Li2 Zn Ti3O8,Li2 Mg Ti3O8 anode materials with structural stability,low cost,environment-friendly and excellent electrochemical performance, etc.,is a kind of great potential for development of lithium-ion battery anode materials. The structure and morphology of the as-prepared cathode materials were characterized by X-ray diffraction(XRD),and Transmission electron microscopy(TEM).Its electrochemical performance of spinel materials were investigated by galvanostatic charge-discharge tests and cyclic voltammetry(CV),AC impedance(EIS). Systematic study of the influence of the electrochemical mechanism synthesis temperature and time on titanate anode material, and electrochemical properties of novel titanate anode material.(1) Spinel Li Cr Ti O4 were synthesized via Solid-state method. The results showed that Li Cr Ti O4 material structure in the electrochemical cycling stability. The samples 800℃-12 h has good cycle stability and excellent rate properties. the discharge capacities of 158 m Ah?g-1,146 m Ah?g-1,140 m Ah?g-1and126 m Ah?g-1 at current densities of 0.5C,1C,2C and 5C,respectively.(2) The 800℃-12 h synthesis Li Cr Ti O4 as anode material,Li Fe PO4/C as cathode material assembled Li Fe PO4/Li Cr Ti O4 full-cell. The results showed that Li Fe PO4/Li Cr Ti O4 full-cell has excellent rate performance and reversibility. Li Fe PO4 /Li Cr Ti O4 full cells has a stable charge-discharge platform~1.8V, the discharge capacity at 0.2C rate material is 116.8 m Ah?g-1, 100 cycles after holding at 110.5 m Ah?g-1. Capacity retention rate was 95%.(3) Spinel Li Fe Ti O4/C composite Material were prepared via solid-state method. The results showed that the carbon coating helps to improve the conductive material, lithium ions Li Fe Ti O4 conducive material embedded and prolapse. Therefore, spinel structure Li Fe Ti O4/C material is superior electrochemical performance Li Fe Ti O4 materials. The initial discharge capacity of Li Fe Ti O4/C at 0.5C was 327.8m Ah?g-1, it was still at 308.6 m Ah?g-1 after 50 cycles. The discharge capacities of 205 m Ah?g-1 at current densities of 5C,It,s indicates that the material has a good rate performance.(4) The Li2MTi3O8(M=Mg,Zn) were prepared via Solid-state method. The results showed that the spinel structure Li2MTi3O8(M=Mg,Zn) materials having a similar crystal structure and similar electrochemical mechanism exhibit similar charging and discharging platform, Li2MTi3O8(M=Mg,Zn)material structure stability and has excellent cycle stability and Coulomb efficiency. The discharge capacity of Li2 Zn Ti3O8 at 0.5C was 225.6m Ah?g-1 in the initial cycle with a good retention of 250 m Ah?g-1 after 100 cycles. The initial discharge capacity of Li2 Mg Ti3O8 at 0.5C was 215.6m Ah?g-1, it was still at 225 m Ah?g-1 after 100 cycles.Li2 Zn Ti3O8 more excellent electrochemical performance than Li2 Mg Ti3O8。... |
