A kind of method that utilizes chromium slag to prepare negative electrode material of lithium ion battery
A technology of lithium ion battery and negative electrode material, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as ecological environment impact, and achieve the effect of increasing conductivity and capacity, good electrochemical cycle and rate performance
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Embodiment 1
[0032] (1) Weigh 1g of chromium slag and add it to 50mL water, stir to dissolve the soluble matter, add concentrated hydrochloric acid to adjust the pH to 2.5, then add 0.2834g NaHSO 3 Restore the chromium slag.
[0033] (2) Use 0.5M KOH to adjust the pH of the mixed solution in step (1) to 8, and put it into a reaction kettle for hydrothermal reaction at 160° C. for 24 hours.
[0034] (3) The hydrothermal reaction product in step (2) is centrifuged, washed with ion water and ethanol in sequence, dried, and then roasted in an air atmosphere at 400° C. for 3 hours to obtain a material containing ferric chromate active material. The X-ray powder diffraction pattern (XRD) of the material containing ferric chromate active substance of gained is as figure 1 As shown, the substance is iron chromate spinel composed of trivalent chromium. Simultaneously test the transmission electron microscope pattern (TEM) to sample, the result is as follows figure 2 As shown, the morphology of ...
Embodiment 2
[0037] (1) Weigh 1g of chromium slag and add it to 50mL water, stir to dissolve the soluble matter, add concentrated hydrochloric acid to adjust the pH to 2.5, then add 0.2834g NaHSO 3 Restore the chromium slag.
[0038] (2) Use 0.5M KOH to adjust the pH of the mixed solution in step (1) to 8, add 0.1-1 g of humic acid to it, stir evenly, put it into the reaction kettle, and conduct a hydrothermal reaction at 160°C for 18 hours.
[0039] (3) The hydrothermal reaction product in step (2) was centrifuged, washed with ionized water and ethanol in sequence, dried, and then roasted in a nitrogen atmosphere at 400°C for 3 hours to obtain a humic acid-loaded ferric chromate negative electrode material.
[0040] (4) Mix the ferric chromate negative electrode material loaded with humic acid obtained in step (3) with a conductive agent such as acetylene black and binder PVDF in a ratio of 8:1:1 to obtain a lithium ion battery negative electrode material. The materials were assembled in...
Embodiment 3
[0042] (1) Weigh 1g of chromium slag and add it to 50mL water, stir to dissolve the soluble matter, add concentrated hydrochloric acid to adjust the pH to 2.5, then add 0.2834g NaHSO 3 Restore the chromium slag.
[0043] (2) Use 0.5M NaOH to adjust the pH of the mixture in step (1) to 8, then add 16.92 mg of graphene oxide, and put it into the reaction kettle for hydrothermal reaction at 160°C for 24 hours.
[0044] (3) The hydrothermal reaction product in step (2) is centrifuged, washed with ionized water and ethanol in sequence, and then dried to obtain a graphene oxide-supported iron chromate negative electrode material; roasted at 400°C in a nitrogen atmosphere for 2 hours to obtain the reduction Iron chromate compounds supported on graphene oxide.
[0045] (4) The ferric chromate compound supported by the reduced graphene oxide obtained in step (3) is mixed with the conductive agent carbon black and the binder PVDF according to the mass ratio of 6:3:1 to obtain the lithi...
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