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Preparation method of azotized graphene lithium ion power battery slurry

A technology of graphene nitride and lithium-ion batteries, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of graphene nitride quality reduction, high nitriding treatment temperature, unsuitable for industrial production, etc., to increase the amount of addition , Improve the high temperature cycle and improve the effect of safety

Active Publication Date: 2015-10-14
XIAMEN KNANO GRAPHENE TECH CORP
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AI Technical Summary

Problems solved by technology

[0007] The existing graphene nitride preparation technology needs to prepare graphene oxide first and then carry out nitriding treatment. During the treatment process, problems such as graphene stacking will be caused, which will reduce the quality of the final prepared graphene nitride; and nitrogen The chemical treatment temperature is high and the time is long, which is not suitable for industrial production

Method used

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  • Preparation method of azotized graphene lithium ion power battery slurry
  • Preparation method of azotized graphene lithium ion power battery slurry
  • Preparation method of azotized graphene lithium ion power battery slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Step 1. Preparation of pre-nitrided expandable graphite: First, weigh 15 parts of graphite, 10 parts of concentrated sulfuric acid, 30 parts of potassium permanganate, and 5 parts of ammonium bicarbonate in parts by weight, mix them thoroughly, and stir and react at 80°C for 0.5- 2h, after washing, add 10 parts of ammonium bicarbonate, mix evenly, carry out the second pre-nitridation at 120°C, and dry for 3 hours to obtain pre-nitrided expandable graphite;

[0038]Step 2. Preparation of nitrided expanded graphite: the above-mentioned pre-nitrided expandable graphite is treated at a high temperature of 1000° C., and nitriding treatment is carried out during the expansion process to obtain nitrided expanded graphite;

[0039] Step 3. Preparation of graphene nitride lithium-ion power battery slurry (the following parts are all weighed by weight):

[0040] (1) Add 100 parts of N-methylpyrrolidone into the mixer tank, wherein the mixer tank is connected to a cooling cycle, a...

Embodiment 2

[0045] Step 1. Preparation of pre-nitrided expandable graphite: First, weigh 10 parts of graphite, 15 parts of concentrated sulfuric acid, 40 parts of potassium dichromate, and 5 parts of ammonium carbonate in parts by weight, mix them thoroughly, stir and react at 60°C for 2 hours, wash Then add 15 parts of ammonium carbonate, mix evenly, carry out the second step of pre-nitridation at 120°C, and dry for 3 hours to obtain pre-nitrided expandable graphite;

[0046] Step 2. Preparation of nitrided expanded graphite: the pre-nitrided expandable graphite is expanded by microwave, the microwave output power is 1500w, and the time is 2min. During the expansion process, nitriding treatment is carried out at the same time to obtain nitrided expanded graphite;

[0047] Step 3. Preparation of graphene nitride lithium-ion power battery slurry (the following parts are all weighed by weight):

[0048] (1) Add 100 parts of N-methylpyrrolidone into the mixer tank, wherein the mixer tank is ...

Embodiment 3

[0053] Step 1. Preparation of pre-nitrided expandable graphite: First, weigh 20 parts of graphite, 15 parts of potassium permanganate, 20 parts of perchloric acid, and 5 parts of urea in parts by weight, mix them thoroughly, stir and react at 60°C for 2 hours, and then wash Add 10 parts of urea, mix well, carry out the second pre-nitridation at 120°C and dry for 3 hours to obtain pre-nitrided expandable graphite;

[0054] Step 2. Preparation of nitrided expanded graphite: The above-mentioned pre-nitrided expandable graphite is treated at a high temperature of 1000 ° C, that is, the nitriding treatment is carried out during the expansion process, and then the nitrided expanded graphite is passed into the boiling furnace, and the temperature is 800 ° C. , nitrogen purging for post-nitridation treatment, and finally collected to obtain nitrided expanded graphite;

[0055] Step 3. Preparation of graphene nitride lithium-ion power battery slurry (the following parts are all weighed...

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Abstract

The invention relates to a preparation method of azotized graphene lithium ion power battery slurry. The preparation method mainly comprises the preparation of azotized expanded graphite and azotized graphene lithium ion power battery slurry. The preparation method comprises the steps of firstly, introducing a nitrogen increasing agent in the expandable graphite and expanded graphite preparation process, and azotizing to obtain azotized expanded graphite; and secondly, preparing azotized graphene by taking the azotized expanded graphite as the raw material, and introducing substances such as a dispersing agent, a conductive agent, active materials and a binder in the preparation process so as to obtain the azotized graphene lithium ion power battery slurry. According to the preparation method, azotized graphene or the compound of azotized graphene and other conductive additives is adopted as the conductive additive of the lithium ion power battery slurry, the high-temperature cycle performance, high-temperature storage performance and high-rate discharge performance are further improved; on the other hand, the preparation of azotized graphene and the dispersion of the lithium ion power battery slurry are implemented simultaneously, and the problem that graphene cannot be dispersed easily in the application process can be solved.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a preparation method of graphene nitride lithium ion power battery slurry. Background technique [0002] Due to its high specific energy, high working voltage, low self-discharge, good cycle life, environmental friendliness, and good safety performance, lithium-ion batteries have taken the lead in becoming a leader in the field of new energy. With the wide application and rapid development of lithium batteries, people have higher and higher performance requirements for lithium-ion batteries, which not only require lithium batteries to have a higher capacity, but also require better capacity retention during repeated charging and discharging. rate, exhibits good cycle performance, and has a long service life. [0003] At present, active materials such as lithium iron phosphate, lithium manganese oxide, and ternary materials commonly used in lithium-ion batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/1391H01M4/1397
CPCH01M4/1391H01M4/1397H01M4/62Y02E60/10
Inventor 赵立平钱文枝周松华邱淑璇
Owner XIAMEN KNANO GRAPHENE TECH CORP
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