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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 th...

Method used

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

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Effect test

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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