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A kind of preparation method of high specific energy olivine manganese phosphate lithium lithium ion battery cathode material

A lithium-ion battery, olivine-type technology, used in battery electrodes, secondary batteries, circuits, etc.

Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] LiMnPO in prior art 4 Electronic conductance and ion conductance still need to be improved

Method used

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  • A kind of preparation method of high specific energy olivine manganese phosphate lithium lithium ion battery cathode material
  • A kind of preparation method of high specific energy olivine manganese phosphate lithium lithium ion battery cathode material
  • A kind of preparation method of high specific energy olivine manganese phosphate lithium lithium ion battery cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Press LiMn 0.85-x Fe 0.15 Zr x (PO 4 ) 1-2x (SiO 4 ) 2x Stoichiometric ratio, where x=0.01, mix lithium source, manganese source, phosphorus source, iron source, zirconium source and silicon source evenly, heat treatment at 400°C for 5 hours, then pulverize and grind, and then sinter at 600°C for 10 hours , after sieving, high specific energy olivine manganese phosphate lithium lithium ion battery cathode material powder is obtained.

[0036] Among them, the lithium source is Li 2 CO 3 .

[0037] Manganese source is MnCO 3 .

[0038] Phosphorus source is NH 4 h 2 PO 4 .

[0039] Iron source is FeC 2 o 4 2H 2 O.

[0040] Zirconium source is ZrO 2 .

[0041] Si source is SiO 2 .

Embodiment 2

[0043] Press LiMn 0.85-x Fe 0.15 Zr x (PO 4 ) 1-2x (SiO 4 ) 2x Stoichiometric ratio, where x=0.005, mix lithium source, manganese source, phosphorus source, iron source, zirconium source and silicon source evenly, heat treatment at 300°C for 10 hours, then pulverize and grind, and then sinter at 500°C for 20 hours , after sieving, high specific energy olivine manganese phosphate lithium lithium ion battery cathode material powder is obtained.

[0044] Wherein, the lithium source is LiOH.

[0045] Manganese source is MnO 2 .

[0046] Phosphorus source is NH 4 h 2 PO 4 .

[0047] Iron source is Fe 3 o 4 .

[0048] Zirconium source is Zr(NO 3 ) 2 .

[0049] Si source is H 4 SiO 4 .

Embodiment 3

[0051] Press LiMn 0.85-x Fe 0.15 Zr x (PO 4 ) 1-2x (SiO 4 ) 2x Stoichiometric ratio, where x=0.02, mix lithium source, manganese source, phosphorus source, iron source, zirconium source and silicon source evenly, heat treatment at 350°C for 7 hours, then pulverize and grind, and then sinter at 550°C for 15 hours , after sieving, high specific energy olivine manganese phosphate lithium lithium ion battery cathode material powder is obtained.

[0052] Among them, the lithium source is LiNO 3 .

[0053] Manganese source is Mn 3 o 4 .

[0054] Phosphorus source is (NH 4 ) 2 HPO 4 .

[0055] Iron source is Fe 2 o 3 .

[0056] Zirconium source is ZrO 2 .

[0057] The silicon source is Si(OC 2 h 5 ) 4 .

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Abstract

A preparation method of olivine type lithium manganese phosphate lithium ion battery anode material with high specific energy is disclosed.according to LiMn0. 85-XFe0.15Zrx(PO4)1-2x (SiO4) 2x stoichiometric ratio, wherein, x=0. 005-0.05, that lithium source, the manganese source, the phosphorus source, the iron source, the zirconium source and the silicon source are uniformly mixed, heat treated at 300-450 DEG C for 2-10 hour, then pulverized and ground, and sintered at 500-800 DEG C for 3-20 hours. The invention has the advantages of simple process route, easy operation, short production period, low production cost, and the like, and greatly improves the circulation performance and the rate performance, and is suitable for practical application and large-scale production. The material prepared by the invention is assembled into an experimental battery, and the performance of the battery is tested on a charging and discharging test platform, and the result shows that the cycling performance and the rate performance of the material are improved through a multi-doping modification method.

Description

technical field [0001] The invention relates to a novel modification method for anode materials of lithium ion batteries, in particular to a method for preparing high specific energy olivine manganese phosphate lithium lithium ion battery cathode materials. Background technique [0002] with LiFePO 4 Similar to LiMnPO 4 It has the following advantages: environmental friendliness, low cost and good safety performance. In addition, due to its high operating voltage (4.1V), LiMnPO 4 energy density (about 700Wh·kg -1 ) than LiFePO 4 20% higher. Therefore, LiMnPO 4 It is regarded as the next-generation cathode material for lithium-ion batteries. However, LiMnPO 4 Lithium-ion conductivity is better than that of LiFePO 4 Low. During the charging and discharging process, MnO 6 The octahedral lattice distortion hinders the deintercalation of lithium ions and produces a large volume change. These intrinsic defects lead to LiMnPO 4 Fast capacity fading and poor rate perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/362H01M4/5825H01M10/0525Y02E60/10
Inventor 徐友龙王继生薛旭
Owner XI AN JIAOTONG UNIV
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