Surface-stabilized and prelithiated anode active materials for lithium batteries and production method
a lithium battery and active material technology, applied in the field of surface stabilization and prelithiation of anode active materials for lithium batteries, can solve the problems of loss of particle-to-particle contact between active materials, affecting the life of charge-discharge cycles, and affecting the specific capacity of batteries. , to achieve the effect of prolonging the charge-discharge cycle and improving the specific capacity
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example 2
tabilized Prelithiated Tin Oxide Particles
[0122]Tin oxide (SnO2) nano particles were obtained by the controlled hydrolysis of SnCl4.5H2O with NaOH using the following procedure: SnCl4.5H2O (0.95 g, 2.7 m-mol) and NaOH (0.212 g, 5.3 m-mol) were dissolved in 50 mL of distilled water each. The NaOH solution was added drop-wise under vigorous stirring to the tin chloride solution at a rate of 1 mL / min. This solution was homogenized by sonication for 5 m in. Subsequently, the resulting hydrosol was reacted with H2SO4. To this mixed solution, few drops of 0.1 M of H2SO4 were added to flocculate the product. The precipitated solid was collected by centrifugation, washed with water and ethanol, and dried in vacuum. The dried product was heat-treated at 400° C. for 2 h under Ar atmosphere.
[0123]Samples of various different tin oxide particles were subjected to electrochemical prelithiation and / or electrochemical formation of lithium-containing species bonded to particle surfaces using lithiu...
example 3
tabilized Prelithiated Tin (Sn) Nano Particles
[0125]Nano particles (76 nm in diameter) of Sn were encapsulated with a thin layer of phenolic resin shell via the spray-drying method, followed by a heat treatment from 350-600° C. for 4 hours to obtain carbon-coated Sn nano particles. Half of these C-coated Sn particles were subjected to encapsulation by a mixture of Li4B, Na4B, LiF, and NaF, which were obtained by electrochemical decomposition of an electrolyte containing lithium boron-fluoride (LiBF4) and NaBF4 dissolved in DEC. Un-protected Sn nano particles from the same batch were also investigated to determine and compare the cycling behaviors of the lithium-ion batteries containing these particles as the anode active material.
[0126]Shown in FIG. 5 are the specific capacities of 3 lithium batteries: one having an anode active material featuring surface-stabilized carbon-encapsulated Sn particles, one having carbon-encapsulated Sn particles, and one having un-protected Sn particle...
example 4
tabilized Prelithiated Si Nanowire-Based Anode Materials
[0127]In a typical procedure of Si nanowire production, approximately 2.112 g of silicon powders (average diameter 2.64 μm) were mixed with 80 ml of a 0.1M aqueous solution of Ni(NO3).6H2O and vigorously stirred for 30 min. Then, water was evaporated in a rotary evaporator and the solid remnants were completely dried in an oven at 150° C. The final sample (Ni-impregnated Si powers) was obtained by grinding the solids in a mortar.
[0128]Subsequently, 0.03 g of Ni-impregnated Si particles was placed in a quartz boat, and the boat was placed in a tube furnace. The sample was reduced at 500° C. for 4 hours under flowing Ar (180 sccm) and H2 (20 sccm), then the temperature was raised to 990° C. to catalytically synthesize Si nanowires; Si nanowires were found to emanate from original micron-scaled Si particles. For the purpose of separating Si nanowires, for instance, every 0.1 g of the reacted Si powders was mixed with 10 ml of etha...
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