Negative pole material of lithium iron phosphate power battery and preparation method of negative pole material

A power battery, lithium iron phosphate technology, applied in the direction of battery electrodes, batteries, secondary batteries, etc., can solve the problems of low high-current charge and discharge capacity, low first-time cycle efficiency, and monitoring battery capacity, etc., to achieve good over-discharge performance, Effects of improving cycle performance and rate performance, and preventing volume expansion

Inactive Publication Date: 2016-10-26
HEZE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used anode materials for lithium iron phosphate power batteries include graphite and mesocarbon microspheres (MCMB), among which graphite has low high-current charge and discharge capacity and poor power performance, and mesocarbon microspheres have excellent cycle performance. , but the specific capacity is not high, and the first cycle efficiency is low. Moreover, the lithium intercalation and extraction potentials of these two negative electrode materials are 0-0.2V, and metal lithium deposition is prone to occur, and the safety under high current conditions is poor.
In addition, both graphite and mesocarbon microsphere anode materials have a good voltage platform, although this is an advantage for small lithium-ion batteries, it is a disadvantage for lithium iron phosphate power batteries
Because the discharge voltage of the positive electrode of the lithium iron phosphate power battery is stable at 3.2V, if a negative electrode material with a stable discharge voltage is used, although the discharge voltage of the entire battery system is stable, the change in battery capacity cannot be monitored according to the change in voltage. The consumption of battery capacity will cause great inconvenience in use

Method used

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  • Negative pole material of lithium iron phosphate power battery and preparation method of negative pole material

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Embodiment 1

[0036]The petroleum coke is crushed and sieved, and the particles with a particle size between 20 mesh and 30 mesh are screened out, and then the particles with a mass ratio of 15:1 are mixed with asphalt and then granulated to obtain a particle size of 10mm-50mm Petroleum coke regranulated; then the petroleum coke regranulated was heat-treated at 600°C in the atmosphere for 1 hour to obtain calcined petroleum coke; The heating rate of ℃ / min is raised to 2600 ℃ and kept for 1 hour to obtain graphitized petroleum coke; finally, according to the mass ratio of graphitized petroleum coke and glucose of 10:1, graphitized petroleum coke is added to 0.5mol / L glucose solution and mixed evenly , and react at a temperature of 150°C for 5 hours to obtain the negative electrode material of lithium iron phosphate power battery. The prepared negative electrode material of lithium iron phosphate power battery has a core-shell structure with petroleum coke as the core and carbon as the shell, ...

Embodiment 2

[0039] The petroleum coke is crushed and sieved, and the particles with a particle size between 30 mesh and 40 mesh are screened out, and then the particles with a mass ratio of 20:1 are mixed with asphalt and then granulated to obtain a particle size of 30mm-80mm Petroleum coke re-granulation; then the petroleum coke re-granulation was heat-treated at 700°C in the atmosphere for 2 hours to obtain calcined petroleum coke; then the calcined petroleum coke was cooled and heated in a nitrogen atmosphere at a flow rate of 100ml / min for 10 The heating rate of °C / min was raised to 2300 °C and kept for 2 hours to obtain graphitized petroleum coke; finally, according to the mass ratio of graphitized petroleum coke and glucose of 20:1, graphitized petroleum coke was added to 1mol / L glucose solution and mixed evenly. And react at a temperature of 200°C for 8 hours to obtain the negative electrode material of lithium iron phosphate power battery. The prepared negative electrode material o...

Embodiment 3

[0042] The petroleum coke is crushed and sieved, and the particles with a particle size between 40 mesh and 50 mesh are screened out, and then the particles with a mass ratio of 20:1 are mixed with asphalt and then granulated to obtain a particle size of 50mm-100mm Petroleum coke re-granulation; then the petroleum coke re-granulation was heat-treated in the atmosphere at 800°C for 3 hours to obtain calcined petroleum coke; then the calcined petroleum coke was cooled and heated in a nitrogen atmosphere at a flow rate of 150ml / min for 12 The heating rate of °C / min was raised to 2000 °C and kept for 3 hours to obtain graphitized petroleum coke; finally, according to the mass ratio of graphitized petroleum coke and glucose of 30:1, graphitized petroleum coke was added to 3mol / L glucose solution and mixed evenly. And react at a temperature of 200°C for 10 hours to obtain the negative electrode material of lithium iron phosphate power battery. The prepared negative electrode material...

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Abstract

The invention provides a negative pole material of a lithium iron phosphate power battery and a preparation method of the negative pole material. The negative pole material of the lithium iron phosphate power battery has a core-shell structure, of which petroleum coke serves as a core and carbon serves as a shell. According to the core-shell-structured negative pole material of the lithium iron phosphate power battery, provided by the invention, the petroleum coke has relatively high adaptability to various electrolytes and is relatively good in overcharging and overdischarging performance and relatively high in safety, and a charging and discharging potential curve of the petroleum coke is free of a platform (the charging and discharging potential curve is of a slope in the range of 0V to 1.2V), so that the condition of attenuation of capacity of the power battery can be very conveniently monitored according to voltage changes; the electric potential of the petroleum coke is higher than that of lithium, so that the deposition of lithium metal on a negative pole can be avoided. In addition, by taking the petroleum coke as the core and taking the carbon as the shell, the petroleum coke can be effectively prevented from volume expansion during lithium inserting, and thus the shortening of the life of the power battery is effectively prevented.

Description

technical field [0001] The invention relates to the field of power batteries, and more specifically, to a negative electrode material for a lithium iron phosphate power battery and a preparation method for the negative electrode material for a lithium iron phosphate power battery. Background technique [0002] Lithium iron phosphate power battery refers to lithium iron phosphate (LiFePO 4 ) as a lithium-ion battery as the cathode material. Because lithium iron phosphate has the advantages of high energy density, low price, and excellent safety, it is especially suitable for the field of power batteries, and it is widely used in hybrid vehicles, electric tools, electric bicycles, Various fields such as electric mopeds, power generation and energy storage devices. [0003] Anode materials are one of the key materials of lithium-ion batteries, and carbonaceous materials are the first materials that people began to study and apply to the anode of lithium-ion batteries, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/362H01M4/583H01M10/0525H01M2220/20Y02E60/10
Inventor 刘庆华李丽
Owner HEZE UNIV
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