Metal-doped Na3V2(PO4)3 composite electrode material and preparation method and application thereof
A composite electrode and sodium vanadium phosphate technology, which is applied in nanotechnology for materials and surface science, battery electrodes, circuits, etc., can solve problems such as unsatisfactory rate performance, difficulty in reaching theoretical specific capacity, and adverse effects
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[0070] Example 1
[0071] This embodiment relates to a method for preparing a metal-doped sodium vanadium phosphate composite electrode material, the preparation method is as follows:
[0072] (1) Selection of raw materials: In this example, the sodium source is selected as Na 2 CO 3 , The vanadium source is V 2 O 5 , The M source is Ca(NO 3 ) 2 , The phosphorus source is NH 4 H 2 PO 4 , The carbon source is polyethylene glycol-400 (PEG-400) and the organic reducing agent is ascorbic acid.
[0073] (2) The amount of raw materials: the Na 2 CO 3 Mass m 1 0.636g, the V 2 O 5 Mass m 2 Is 0.709g, the Ca(NO 3 ) 2 Mass m 3 Is 0.033g, the NH 4 H 2 PO 4 Mass m 4 It is 1.380g, the volume V of the polyethylene glycol-400 (PEG-400) 0 6ml, the mass of ascorbic acid m 5 It is 1.057g and the volume V of deionized water is 70ml.
[0074] (3) Preparation of the mixed solution: Under the condition of continuous stirring, first, the Na 2 CO 3 , The V 2 O 5 , The Ca(NO 3 ) 2 And the NH 4 H 2 PO 4 Dissolv...
Example Embodiment
[0085] Example 2
[0086] The preparation method of a sodium vanadium phosphate composite electrode material involved in this example is basically the same as the preparation method of Example 1, except that:
[0087] The M source is Mg(NO 3 ) 2 , Quality m 3 It is 0.018g.
[0088] The V 2 O 5 Mass m 2 It is 0.717g.
[0089] The metal-doped sodium vanadium phosphate composite electrode material obtained by the above-mentioned method for preparing a metal-doped sodium vanadium phosphate composite electrode material is Na 3 V 1.97 Mg 0.03 (PO 4 ) 3 / C(x=0.03) Composite electrode material.
[0090] With 70wt% Na 3 V 1.97 Mg 0.03 (PO 4 ) 3 / C electrode material, 15wt% acetylene black, 15wt% PVDF, made into slurry, uniformly coated on aluminum foil, vacuum-dried, stamped into circular electrode pole piece, with metallic sodium as the counter electrode, 1mol / LNaClO 4 / DMC+EC (volume ratio is 1:1)+5% FEC is electrolyte, Whatman DF / D is diaphragm, assembled into button battery.
Example Embodiment
[0091] Example 3
[0092] The preparation method of a sodium vanadium phosphate composite electrode material involved in this example is basically the same as the preparation method of Example 1, except that:
[0093] The M source is Ni(NO 3 ) 2 , Quality m 3 It is 0.116g.
[0094] The V 2 O 5 Mass m 2 It is 0.691g.
[0095] The metal-doped sodium vanadium phosphate composite electrode material obtained by the above-mentioned method for preparing a metal-doped sodium vanadium phosphate composite electrode material is Na 3 V 1.9 Ni 0.1 (PO 4 ) 3 / C(x=0.1) Composite electrode material.
[0096] With 70wt% Na 3 V 1.9 Ni 0.1 (PO 4 ) 3 / C electrode material, 15wt% acetylene black, 15wt% PVDF, made into slurry, uniformly coated on aluminum foil, vacuum-dried, stamped into circular electrode pole piece, with metallic sodium as the counter electrode, 1mol / LNaClO 4 / DMC+EC (volume ratio is 1:1)+5% FEC is electrolyte, Whatman DF / D is diaphragm, assembled into button battery.
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