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Composite carbon material, modified electrode material prepared from composite carbon material and lithium ion battery

A technology of electrode materials and carbon materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory coating effect, high cost, and difficulty in achieving uniform coating.

Active Publication Date: 2018-02-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simply using nitrogen-doped graphene for surface coating has high cost, graphene is not easy to disperse, and it is difficult to achieve uniform coating, which leads to unsatisfactory coating effect, reduces the volume specific energy of the product, and ultimately affects the battery life of lithium iron phosphate. The problem of chemical properties, which limits its application in electrode material coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] (1) Preparation of nitrogen, phosphorus, sulfur, chlorine in situ co-doped carbon materials

[0094] Weigh an appropriate amount of trimeric phosphazene chloride, thiourea and hexachloro-1,3-butadiene, and simultaneously weigh pyrrole with a mol ratio of 30:1 to hexachloro-1,3-butadiene, so that The atomic ratio of nitrogen, phosphorus, and sulfur is 3:1:6. After mixing the above four substances, they are reacted at 220°C for 8 hours under a high-pressure airtight condition of 6 MPa, and the reacted product is cooled and washed with deionized water for 5 times. Vacuum drying at 100°C for 20 hours to obtain the first product, which was treated in nitrogen at 800°C for 4 hours to obtain in-situ co-doped carbon materials of nitrogen, phosphorus, sulfur, and chlorine.

[0095] (2) Preparation of nitrogen-doped graphene

[0096] A chemical vapor deposition method is used to obtain a nitrogen-doped graphene material with a doping amount of 0.01-10 wt% under normal pressure a...

Embodiment 2

[0102] Except the following content, other preparation methods and conditions are identical with embodiment 1:

[0103] Adjust the amount of raw materials added so that in the in-situ co-doped carbon material of nitrogen, phosphorus, sulfur, and chlorine, the atomic ratio of nitrogen, phosphorus, and sulfur is 1:1:8, and the amount of composite carbon material added is modified lithium iron phosphate 10wt% of the total mass of the positive electrode material;

[0104] Regulate the amount of raw material added so that the nitrogen doping amount in the nitrogen-doped graphene is 5wt%;

[0105] The in-situ co-doped composite carbon material of nitrogen, phosphorus, sulfur and chlorine accounts for 2wt% of the total composite carbon material, nitrogen-doped graphene accounts for 20wt% of the total composite carbon material, and glucose accounts for 78wt% of the total composite carbon material %.

[0106] The lithium iron phosphate cathode material modified by the composite carbo...

Embodiment 3

[0108] Except the following content, other preparation methods and conditions are identical with embodiment 1:

[0109] Adjust the amount of raw materials added so that in the in-situ co-doped carbon material of nitrogen, phosphorus, sulfur, and chlorine, the atomic ratio of nitrogen, phosphorus, and sulfur is 2:1:7, and the amount of composite carbon material added is modified lithium iron phosphate 12wt% of the total mass of the positive electrode material;

[0110] Adjust the amount of raw material added so that the nitrogen doping amount in the nitrogen-doped graphene is 8wt%;

[0111] The in-situ co-doped composite carbon materials of nitrogen, phosphorus, sulfur and chlorine accounted for 8wt% of the total composite carbon materials, nitrogen-doped graphene accounted for 5wt% of the total composite carbon materials, and glucose accounted for 87wt% of the total composite carbon materials %.

[0112] The lithium iron phosphate cathode material modified by the composite c...

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Abstract

The invention discloses a composite carbon material, a modified electrode material prepared from the composite carbon material and a lithium ion battery. The composite carbon material contains a firstcarbon material, a second carbon material and a carbon source, wherein the first carbon material and the second carbon material are doped carbon materials. Compared with a conventional manner for firstly coating by virtue of a carbon source for carbonization to obtain a carbon material coating layer, the composite carbon material has the advantages that by introducing a proper amount of the firstcarbon materials and a proper amount of the second carbon materials, on one hand, the use amount of a common carbon source is reduced, and on the other hand, the electrochemical properties of structure stability, electrical conductivity, tap density, volume energy density, rate capability, cycle performance and the like of an electrode material modified by the composite carbon material can be cooperatively improved. By coating and modifying lithium iron phosphate by virtue of the composite carbon material, the rate capability and cycling stability of lithium iron phosphate can be substantially improved, the specific discharge capacity of lithium iron phosphate is more than or equal to 149mAh / g under a 6C rate condition, and the capacity retention ratio is more than or equal to 97% after 60 cycles.

Description

technical field [0001] The invention relates to a composite carbon material and modified lithium iron phosphate, a preparation method thereof and a lithium ion battery, and belongs to the field of lithium ion battery cathode material preparation technology and lithium ion batteries. Background technique [0002] Lithium-ion batteries have outstanding advantages such as large discharge specific capacity, high voltage platform, safety, long life, and environmental friendliness. At present, they are widely used in various fields such as small portable batteries, power batteries for new energy vehicles, and energy storage. Due to the scarcity and high price of cobalt resources, olivine-type lithium iron phosphate cathode materials with abundant resources, environmental friendliness and low price are favored. However, the conductivity of lithium iron phosphate cathode materials is low. In order to obtain high-rate charge-discharge characteristics and long service life, it is nece...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583
CPCH01M4/362H01M4/583Y02E60/10
Inventor 谭强强徐宇兴
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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