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A kind of preparation method of lithium iron phosphate battery negative electrode material

A lithium iron phosphate battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor carbon coating, reduced charge constant current ratio and discharge ratio, and electrode powder dropout, etc., to achieve Increase the number of embedded sites, improve charge and discharge performance and rate performance, and prevent stacking effects

Active Publication Date: 2018-07-24
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when graphite is used as the negative electrode material, the flux molecules in the electrolyte are likely to co-intercalate with lithium ions, resulting in the collapse of the graphite layer and a sharp drop in the electrochemical performance of the battery. In order to solve this problem, carbon materials are usually used to coat graphite. To improve the charging and discharging performance of lithium iron phosphate battery
[0004] However, after being coated with carbon materials, the negative electrode material has disadvantages such as poor carbon coating and uneven granulation, which lead to problems such as poor charge and discharge performance and powder drop of the electrode during the charge and discharge process; and the gravitational force between the graphite layers Larger, the material is easy to stack, which greatly hinders the intercalation / extraction of lithium ions on the surface of the negative electrode material, resulting in a low surface utilization rate of the negative electrode material, which limits the efficient use of the surface of the negative electrode material; the carbon materials used usually have poor structural consistency , Poor machinability, resulting in small reversible capacity, sharp decrease in charge constant current ratio and discharge ratio, and poor rate performance in lithium iron phosphate batteries during repeated charge and discharge

Method used

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  • A kind of preparation method of lithium iron phosphate battery negative electrode material
  • A kind of preparation method of lithium iron phosphate battery negative electrode material
  • A kind of preparation method of lithium iron phosphate battery negative electrode material

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preparation example Construction

[0017] The invention provides a method for preparing a lithium iron phosphate battery negative electrode material, comprising the following steps:

[0018] Step 1: Weigh the oxygen source, zinc source and nitrogen source according to a certain molar ratio, dissolve them in deionized water, and carry out ultrasonic stirring for 20-30 minutes, filter with suction, and dry the obtained solid in an air drying oven to obtain metal-organic Frame material NH 2 / Zn-TSCD;

[0019] Step 2: The organic framework material NH obtained in Step 1 2 / Zn-TSCD placed full of N 2 Heating in a tube furnace, first raise the temperature to 340-360°C at a heating rate of 8-10°C / min, and keep for 1-2h; then raise the temperature to 960-1000°C at a heating rate of 3-5°C / min, and keep 3-5h; finally cool down to room temperature at a cooling rate of 5-10°C / min to obtain N, Zn-doped mesoporous carbon material C(N, Zn);

[0020] Step 3: Disperse the natural graphite and the N, Zn-doped mesoporous carb...

Embodiment 1

[0036] 1. Weigh 1.83g of ethylenediamine and dissolve it in 320ml of deionized water, add 44.1g of sodium citrate dihydrate and 29.7g of zinc nitrate hexahydrate, stir ultrasonically for 20min, filter with suction, and place the obtained solid in an air drying oven at 100°C After drying for 8 hours, the MOFs material NH 2 / Zn-TSCD;

[0037] 2. The MOFs material NH prepared in step 1 2 / Zn-TSCD placed full of N 2 In a tube furnace, the temperature was raised to 340°C at a heating rate of 8°C / min, kept for 2 hours, then raised to 960°C at a heating rate of 3°C / min, kept for 5 hours, and finally cooled to at a cooling rate of 5°C / min. At room temperature, obtain N, Zn-doped mesoporous carbon material C(N, Zn);

[0038] 3. Disperse 20 g of natural graphite and 0.5 g of the N, Zn-doped mesoporous carbon material C (N, Zn) prepared in step 2 in deionized water, and ultrasonically stir for 60 min; transfer the resulting solution to an autoclave in 110°C for hydrothermal treatment f...

Embodiment 2

[0040] 1. Weigh 3.09g of diethylenetriamine and dissolve it in 320ml of deionized water, add 44.1g of sodium citrate dihydrate and 18.3g of zinc acetate, stir ultrasonically for 20min, filter with suction, and dry the obtained solid in an air drying oven at 100°C 8h, get MOFs material NH 2 / Zn-TSCD;

[0041] 2. The MOFs material NH prepared in step 1 2 / Zn-TSCD placed full of N 2 In a tube furnace, the temperature was raised to 360°C at a heating rate of 8°C / min, kept for 1h, then raised to 1000°C at a heating rate of 3°C / min, kept for 3h, and finally cooled to At room temperature, obtain N, Zn-doped mesoporous carbon material C(N, Zn);

[0042] 3. Disperse 20 g of natural graphite and 0.5 g of the N, Zn-doped mesoporous carbon material C (N, Zn) prepared in step 2 in deionized water, and ultrasonically stir for 60 min; transfer the resulting solution to an autoclave in 120°C for hydrothermal treatment for 16 hours; the obtained product was subjected to suction filtration ...

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Abstract

The invention provides a preparation method for a negative electrode material of a lithium iron phosphate battery. A mesoporous carbon material C(N, Zn) is adopted for modification of natural graphite; the dispersity, surface charge density and structural stability of the negative electrode material are regulated and controlled; piling up of the negative electrode material in a charging-discharging process is prevented; the quantity of embedded site points of lithium ions on the surface of a negative electrode is increased; and it is ensured that Li<+> can still smoothly migrate to an active center under relatively high current density, so that the charging-discharging performance and the rate capability of the lithium iron phosphate battery in a low-temperature environment can be improved.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a lithium iron phosphate battery negative electrode material. 【Background technique】 [0002] With the rapid development of social economy, the demand for new energy vehicles is increasing day by day, and the research on power batteries has also developed rapidly. As the mainstream battery in the power battery of new energy vehicles, lithium iron phosphate battery has attracted much attention because of its good safety and high energy density. In a normal temperature environment, lithium iron phosphate materials have excellent charging performance and rate performance. However, as the temperature decreases, the charging constant current ratio and rate performance of lithium iron phosphate materials decrease sharply, which cannot meet the requirements of lithium iron phosphate batteries in low temperature environments. need. [0003] The s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/628H01M10/0525Y02E60/10
Inventor 杨泛明
Owner OPTIMUM BATTERY CO LTD
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