Nitrogen-phosphorus-sulfur co-doping composite carbon material, preparation method of composite carbon material and lithium ion battery
A composite carbon and co-doping technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that the electrochemical performance and cycle stability of lithium iron phosphate cannot be greatly improved, and the electronic conductivity of lithium iron phosphate cathode material is poor. Lithium ion diffusion issues and other issues
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Embodiment 1
[0082] (1) Preparation of nitrogen, phosphorus and sulfur co-doped composite carbon materials
[0083] Nitriding the honeycomb in ammonia gas at 950°C for 1 hour, the heating rate during nitriding is 8°C / min, and the product after nitriding is ground and passed through a 200-mesh sieve, denoted as C1;
[0084] Mix phosphazene tripolychloride and graphene with a mass ratio of 0.15:1 evenly, and react at 200°C for 10 h in a closed container under a pressure of 10 MPa. The product is cooled, washed, and dried, and is designated as C2;
[0085] Weighing mass ratio successively is 70wt%: 20wt%: 10wt% C1, C2 and thiourea, and weigh an appropriate amount of sodium hydroxide, so that the mass ratio of the total mass of C1, C2 and thiourea to sodium hydroxide is 1 : 1.5, add an appropriate amount of deionized water to the above four substances, and mix evenly, so that the ratio of the total mass of C1, C2, thiourea and sodium hydroxide to the mass of the added deionized water is 1:35. ...
Embodiment 2
[0091] (1) Preparation of nitrogen, phosphorus and sulfur co-doped composite carbon materials
[0092] Nitriding the cigarette filter in ammonia gas at 700°C for 8 hours, the heating rate during nitriding is 5°C / min, the product after nitriding is ground through a 200-mesh sieve, and recorded as C1;
[0093] Mix phosphazene tripolychloride and graphene with a mass ratio of 0.01:1 evenly, and react at 300°C for 24 hours in a closed container under a pressure of 15 MPa. The product is cooled, washed, and dried, which is designated as C2;
[0094] Weighing mass ratio successively is 80wt%: 15wt%: 5wt% C1, C2 and sodium dodecylbenzenesulfonate, and weigh an appropriate amount of sodium hydroxide, make C1, C2 and sodium dodecylbenzenesulfonate The mass ratio of the total mass of the sodium hydroxide to the sodium hydroxide is 1:6, add an appropriate amount of deionized water to the above four substances, and mix well, so that the total mass of C1, C2, sodium dodecylbenzenesulfonate...
Embodiment 3
[0100] (1) Preparation of nitrogen, phosphorus and sulfur co-doped composite carbon materials
[0101] Nitriding the coconut shell in ammonia at 900°C for 4 hours, the heating rate during nitriding is 10°C / min, and the nitriding product is ground through a 200-mesh sieve, which is recorded as C1;
[0102] Mix adenosine triphosphate and graphene with a mass ratio of 0.03:1 evenly, and react at 280°C for 5 hours in a closed container under a pressure of 5 MPa. The product is cooled, washed, and dried, and is designated as C2;
[0103] Weighing mass ratio successively is 65wt%: 20wt%: 15wt% C1, C2 and styrene sulfonate amine, and weigh an appropriate amount of sodium hydroxide, make the total mass of C1, C2 and thiourea and the quality of sodium hydroxide The ratio is 1:5, add an appropriate amount of deionized water to the above four substances, and mix evenly so that the total mass of C1, C2, sodium dodecylbenzenesulfonate and sodium hydroxide is equal to the mass of the added ...
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