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

Active Publication Date: 2018-09-04
ZHONGKE LITHIUM BATTERY NEW ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon source coating method adopted in this patent cannot fundamentally solve the problems of poor electronic conductivity of lithium iron phosphate cathode material and the diffusion of lithium ions, and cannot effectively improve the electrochemical performance and cycle stability of lithium iron phosphate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a nitrogen-phosphorus-sulfur co-doping composite carbon material, a preparation method of the nitrogen-phosphorus-sulfur co-doping composite carbon material, and a lithium ionbattery. The nitrogen element of the composite carbon material is from a nitrogen-containing biomass carbon material; the phosphorus element is from a phosphorus doping graphene precursor. A method comprises the following steps of (1) mixing the nitrogen-containing biomass carbon material, the phosphorus doping graphene precursor, a sulfur source and an activating agent; water is added for soaking; then, drying is performed; (2) then, performing activation treatment at 600 to 1,000 DEG C to obtain the nitrogen-phosphorus-sulfur co-doping composite carbon material. The method provided by the invention achieves green and environment-friendly effects; the production cost is greatly reduced; when the composite carbon material is used for coating lithium iron phosphate, the power performance and circulation stability of the lithium iron phosphate positive electrode material can be obviously improved; the first time specific discharge capacity at the power of 0.1C is 161 mAh / g or higher; thecharging and discharging efficiency is 98 percent or higher; at the 8C power, the specific discharge capacity is 146 mAh / g or higher; after the circulation for 40 weeks, the volume is maintained at avalue being 98 percent or higher.

Description

technical field [0001] The invention belongs to the field of lithium ion battery cathode material and its preparation. It relates to a nitrogen, phosphorus and sulfur co-doped composite carbon material, its preparation method and lithium ion battery, especially to a nitrogen, phosphorus and sulfur co-doped composite carbon material, its preparation method, and the surface containing the composite carbon material Coated lithium iron phosphate cathode material and lithium ion battery. Background technique [0002] The electronic conductance of lithium iron phosphate cathode material and the diffusion of lithium ions are the key issues restricting the application of lithium iron phosphate cathode material. Existing technical methods usually use traditional carbon materials such as sucrose, glucose, and rock sugar as carbon sources to coat lithium iron phosphate cathode materials. Although this method improves the electronic conductance of lithium iron phosphate cathode materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 张正亮谭强强徐宇兴
Owner ZHONGKE LITHIUM BATTERY NEW ENERGY CO LTD
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