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Polyanion-like lithium ion battery layered positive electrode material and preparation method thereof

A lithium-ion battery and positive electrode material technology, applied in the field of lithium-ion battery materials and electrochemistry, can solve the problems of low conductivity, high conductivity, poor rate performance, etc.

Inactive Publication Date: 2014-03-26
PEKING UNIV
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AI Technical Summary

Problems solved by technology

At present, the main limitation to the wide-scale application of lithium-ion batteries is the low specific capacity of the positive electrode material. Several layered LiCoO are commonly used in the market. 2 ,LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and polyanionic LiFePO 4 and spinel-type LiMn 2 o 4 The specific capacity is very low (120-160mAh / g), which cannot meet the requirements of commercial applications
[0003] Traditional layered materials (LiCoO 2 and LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ) High conductivity, good rate performance, high theoretical specific capacity (about 270-280mAh / g) easy to prepare but the actual capacity that can be released is only 140-160mAh / g
After people's research, it was found that traditional layered materials like LiCoO 2 and LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 For layered materials containing Co, the phenomenon that O participates in charge compensation is more serious, which leads to the instability of O under high voltage, and the collapse of the structure is an important reason for the sharp decline in specific capacity.
In recent years, the lithium-rich cathode materials that have been researched hotly have a high specific capacity (above 250mAh / g), but they have many shortcomings, and the cycle performance needs to be further improved, especially the ternary lithium-rich materials, which can release a capacity of 300mAh / g for the first time. , but only about 200mAh / g after 100 laps
The polyanionic LiFePO 4 The theoretical specific capacity is only 170mAh / g, and the conductivity is very low, and the rate performance is poor, but its cycle performance is very good, and the performance is relatively stable. This is due to the polyanion PO 4 The structure is very stable, and the energy level position of the 2p orbital of O decreases due to the formation of polyanions, so it is not easy to participate in charge compensation under high voltage, maintaining the stability of the structure

Method used

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  • Polyanion-like lithium ion battery layered positive electrode material and preparation method thereof
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  • Polyanion-like lithium ion battery layered positive electrode material and preparation method thereof

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Embodiment 1

[0039] Embodiment 1 solid-phase method synthesizes class polyanion material LiCo(PO 4 ) 0.05 o 1.8

[0040] Take 0.749gLiOH·H 2 O, 1.605gCo 3 o 4 and 0.115gNH 4 h 2 PO 4 Grind after mixing evenly. After grinding evenly, put it in a porcelain boat and place it in a tube furnace for pre-fired at 450°C for 4 hours. Grinding evenly is the target product.

[0041] The target product was mixed with carbon black and PVDF at a mass ratio of 8:1:1, ground evenly with N-methylpyrrolidone as a solvent, then coated on an aluminum foil, and placed in a blast drying oven at 100°C for 1 hour. After taking it out, roll it on a rolling machine several times and cut it into electrode discs. Use this as the positive electrode, use the lithium sheet as the negative electrode, glass microfiber filter paper GF / D produced by whatman company, and the electrolyte is the lithium-ion battery high-voltage electrolyte produced by Beijing Chemical Reagent Research Institute, and pack it into a bu...

Embodiment 2

[0043] Embodiment 2 solid-phase method synthesizes class polyanion material LiCo(PO 4 ) 0.05 o 1.8

[0044] Take 0.749gLiOH·H 2 O, 1.658gCo 2 o 3 and 0.115gNH 4 h 2 PO 4 Grind after mixing evenly. After grinding evenly, put it in a porcelain boat and place it in a tube furnace for pre-fired at 400°C for 5 hours. Grinding evenly is the target product.

[0045] The target product was mixed with carbon black and PVDF at a mass ratio of 8:1:1, ground evenly with N-methylpyrrolidone as a solvent, then coated on an aluminum foil, and placed in a blast drying oven at 100°C for 1 hour. After taking it out, roll it on a rolling machine several times and cut it into electrode discs. Use this as the positive electrode, use the lithium sheet as the negative electrode, glass microfiber filter paper GF / D produced by whatman company, and the electrolyte is the lithium-ion battery high-voltage electrolyte produced by Beijing Chemical Reagent Research Institute, and pack it into a bu...

Embodiment 3

[0047] Embodiment 3 solid-phase method synthesizes class polyanion material LiCo(PO 4 ) 0.1 o 1.6

[0048] Take 0.659gLi 2 CO 3 , 1.605g Co 3 o 4 and 0.196gH 3 PO 4 (Solid) Grind after mixing evenly, put it in a porcelain boat after grinding evenly, place it in a tube furnace and pre-fire it at 500°C for 3 hours, then take it out and grind it again, mix it evenly, and finally put it in a tube furnace again and calcinate at 900°C for 10h , take it out and grind it evenly, which is the target product.

[0049] The target product was mixed with carbon black and PVDF at a mass ratio of 8:1:1, ground evenly with N-methylpyrrolidone as a solvent, then coated on an aluminum foil, and placed in a blast drying oven at 100°C for 1 hour. After taking it out, roll it on a rolling machine several times and cut it into electrode discs. Use this as the positive electrode, use the lithium sheet as the negative electrode, glass microfiber filter paper GF / D produced by whatman company...

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Abstract

The present invention discloses a polyanion-like lithium ion battery layered positive electrode material and a preparation method thereof. The polyanion-like lithium ion battery layered positive electrode material has a chemical formula of LiM(AO4)xO2-delta, wherein x is more than 0 and is less than 1, delta is more than 0 and is less than 2, M is LiaNibCocMn1-a-b-c, a is more than or equal to 0 and is less than 1, b is more than or equal to 0 and is less than 1, c is more than 0 and is less than or equal to 1, a+b+c is less than or equal to 1, and A is one or a plurality of materials selected from P, S and Si. According to the present invention, the solid-phase method, the co-precipitation method and the sol-gel method are adopted to combine the layered structure and the polyanion to prepare the polyanion-like type lithium ion battery layered positive electrode material, and the polyanion-like type lithium ion battery layered positive electrode material has high specific capacity and good stability compared with the current layered material.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials and electrochemistry, and relates to a polyanion-like lithium ion battery layered cathode material and a preparation method thereof. Background technique [0002] With the further consumption of fossil energy, the demand for sustainable development and environmental friendliness is increasing. As one of the most commonly used energy storage materials, lithium-ion batteries play a very important role in the development prospects of the world's future energy. At present, the main limitation to the wide-scale application of lithium-ion batteries is the low specific capacity of the positive electrode material. Several layered LiCoO are commonly used in the market. 2 ,LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and polyanionic LiFePO 4 and spinel-type LiMn 2 o 4 Their specific capacities are very low (120-160mAh / g), which cannot meet the requirements of commercial applications. [0003] Traditional...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/505H01M4/525
CPCY02E60/122H01M4/366H01M4/5825Y02E60/10
Inventor 李彪马进夏定国
Owner PEKING UNIV
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