Quaternary lithium iron phosphate glass and preparation method thereof

A quaternary lithium iron phosphate and lithium iron phosphate technology, applied in the field of functional glass materials, can solve the problems of cobalt environment and human body hazards, low material tap density, limited cobalt resources, etc., and achieves strong glass forming ability, wide composition, Effects that are easy to implement

Inactive Publication Date: 2012-02-08
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional lithium-ion battery cathode material is LiCoO 2 , the main problem of which is: LiCoO 2 Not stable enough, it will decompose during overcharging and overheating, and may cause battery explosion; global cobalt resources are limited, and product prices are high; in addition, cobalt will cause certain harm to the environment and human body
[0003] At this stage, the direct synthesis of lithium iron phosphate electrode materials usually first prepares powders by solid-state reaction, microwave synthesis, hydrothermal treatment, sol-gel method, co-precipitation method, etc., and then the powder is pressed and sintered to make electrode materials , but the electrode material prepared in this way has a very prominent problem, that is, the tap density of the material is small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The molecular formula of quaternary lithium iron phosphate glass is: M-Li 2 O-Fe 2 o 3 -P 2 o 5 , where M is Na 2 O, Na 2 The mole percent of O is 2.4%, Li 2 The mole percentage of O is 17.6%, Fe 2 o 3 The mole percentage is 30%, P 2 o 5 The mole percentage of is 50%.

[0028] The preparation method is as follows:

[0029] (1) Lithium carbonate, ferric oxide, ammonium dihydrogen phosphate and sodium carbonate were weighed respectively to introduce Li 2 O, Fe 2 o 3 ,P 2 o 5 and Na 2 The raw materials of O, their ratio meets the molar ratio after being converted into the corresponding oxide;

[0030] (2) Put the mixed raw materials into a sintered quartz crucible and heat in a high-temperature furnace at 1200°C for 1 hour;

[0031] (3) Add the melted raw material solution into a mold to form it, then place it in a muffle furnace at 300-400°C for 1-2 hours, and cool naturally with the furnace to obtain a quaternary lithium iron phosphate bulk glass. In o...

Embodiment 2

[0035] The molecular formula of quaternary lithium iron phosphate glass is: Li 2 O-Fe 2 o 3 -Al 2 o 3 -P 2 o 5 , Li 2 The mole percentage of O is 30%, Fe 2 o 3 The mole percentage is 16.8%, Al 2 o 3 The mole percentage is 3.2%, P 2 o 5 The mole percentage of is 50%.

[0036] The preparation method is as follows:

[0037] (1) Lithium carbonate, ferric oxide, ammonium dihydrogen phosphate and aluminum oxide are respectively taken as raw materials, and their proportioning meets the molar ratio after being converted into corresponding oxides;

[0038] (2) Put the mixed raw materials into a sintered quartz crucible and heat in a high-temperature furnace at 1200°C for 1 hour;

[0039] (3) Pour the melted raw material solution directly into cold water to quench the glass particles, and after drying, grind

[0040] Grinding to obtain glass powder.

Embodiment 3

[0042] The molecular formula of quaternary lithium iron phosphate glass is: Li 2 O-Fe 2 o 3 -B 2 o 3 -P 2 o 5 , Li 2 The mole percentage of O is 30%, Fe 2 o 3 The mole percentage is 20%, B 2 o 3 The mole percentage is 12%, P 2 o 5 The mole percentage of is 38%.

[0043] The preparation method is as follows:

[0044] (1) Lithium carbonate, ferric oxide, ammonium dihydrogen phosphate and boric acid are taken as raw materials respectively, and their proportioning meets the molar ratio after being converted into corresponding oxides;

[0045] (2) Put the mixed raw materials into a sintered quartz crucible and heat in a high-temperature furnace at 1200°C for 1 hour;

[0046] (3) Add the melted raw material solution into a mold to form it, then place it in a muffle furnace at 300-400°C for 1-2 hours, and cool naturally with the furnace to obtain a quaternary lithium iron phosphate bulk glass. In order to prevent the mold from being too cold, the mold is heated before ...

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PUM

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Abstract

The invention discloses quaternary lithium iron phosphate glass. The chemical formula of the glass is M-Li2O-Fe2O3-P2O5 or Li2O-Fe2O3-M-P2O5, wherein M is a monovalent, bivalent, trivalent or quadrivalent oxide, and M can be Na2O, K2O, MgO, CaO, BaO, ZnO, Al2O3, B2O3 or SiO2. The invention also discloses a preparation method of the quaternary lithium iron phosphate glass. Compared with ternary lithium iron phosphate glass, the quaternary glass of the invention has wide composition, wide molecular formula adjustment range and strong forming capacity. If further subjected to thermal treatment, the quaternary glass is expected to be the lithium ion battery electrode material with density being higher than that of the existing lithium iron phosphate electrode material, thus being beneficial to realizing miniaturization of the lithium ion battery.

Description

technical field [0001] The invention relates to a quaternary lithium iron phosphate glass and a preparation method thereof, belonging to the technical field of functional glass materials. Background technique [0002] The traditional lithium-ion battery cathode material is LiCoO 2 , the main problem of which is: LiCoO 2 Not stable enough, it will decompose when overcharged and overheated, and may cause battery explosion; global cobalt resources are limited, and product prices are high; in addition, cobalt will cause certain harm to the environment and human body. These problems limit the LiCoO 2 Use on power units. In 1997, Padhi et al [Padhi A K, Najundaswamy K S, Goodenough J B, J. Electrochem Soc., 1997, 144(4): 1188-1194] found that LiFePO4 with olivine structure can reversibly insert and extract lithium ions, compared with on LiCoO 2 , LiFePO 4 It has the advantages of high specific capacity, good cycle performance, good high-temperature charge and discharge perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/16C03C3/17C03C3/19C03C3/062
Inventor 刘世权杨瑞娟王迎辉
Owner UNIV OF JINAN
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