Doped modified lithium ion battery cathode material and preparation method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of poor electrochemical activity of lithium manganese phosphate cathode materials, poor cycle performance of lithium manganese phosphate cathode materials, and inability to withstand large currents Charge and discharge and other issues, to achieve the effect of improving high-current charge and discharge capacity and cycle performance, realizing large-scale industrial production, and easy control

Pending Publication Date: 2019-08-02
NINGBO POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the lithium manganese phosphate cathode material has broad application prospects, the commercialization of this material has not yet been applied, mainly because the synthesized lithium manganese phosphate cathode material has poor electrochemical activity.
The reason for the poor electrochemical performance of the lithium manganese phosphate cathode material is that the conductivity of lithium manganese phosphate is too poor (the conductivity of lithium manganese phosphate is about 10-14S / cm, while the conductivity of lithium iron phosphate is about 10-9S / cm), It is difficult for lithium ions to move in the crystal, which leads to poor cycle performance of lithium manganese phosphate cathode material and cannot withstand high current charge and discharge

Method used

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  • Doped modified lithium ion battery cathode material and preparation method thereof
  • Doped modified lithium ion battery cathode material and preparation method thereof
  • Doped modified lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Accurately weigh 0.5molLi 2 CO 3 , 0.95molMnH 2 PO 4 , 0.05mol MnAsO 4, mixed evenly and added to the ball milling tank, then weighed 135g of glucose and added to the ball milling tank, then added 160ml of absolute ethanol as the mixing medium, and fully milled with agate balls for 2 hours, took out the precursor and dried it and placed it in a tube furnace , under the protection of high-purity argon, heated to 700°C at a heating rate of 5°C / min, and held for 6 hours to obtain a phosphate-doped modified lithium manganese phosphate cathode material LiMn(PO 4 ) 0.95 (AsO 4 ) 0.05 ;

[0031] The synthesized phosphate doped modified lithium manganese phosphate cathode material LiMn(PO 4 ) 0.95 (AsO 4 ) 0.05 Mix evenly with acetylene black and polytetrafluoroethylene at a mass ratio of 85:10:5, press it into a film with a thickness of about 1mm with a film laminator, and dry it fully in an oven at 120°C. The intercepted surface area is 1cm 2 A circular membrane, ...

Embodiment 2

[0033] Accurately weigh 1.0mol LiOH, 0.97mol MnCO 3 , 0.97mol NH 4 h 2 PO 4 , 0.015mol Mn 2 As 2 o 7 , mixed evenly and added to the ball milling jar, then weighed 105g of polyethylene glycol and put it into the ball milling jar, then added 160ml of absolute ethanol as the mixing medium, and fully milled with agate balls for 3 hours, took out the precursor and dried it and placed it in a tube In a type furnace, under the protection of high-purity argon, heated to 650 °C at a heating rate of 10 °C / min, and held for 8 hours to obtain the phosphate-doped modified lithium manganese phosphate cathode material LiMn(PO 4 ) 0.97 (AsO 4 ) 0.03 ;

[0034] The synthesized phosphate doped modified lithium manganese phosphate cathode material LiMn(PO 4 ) 0.97 (AsO 4 ) 0.03 Mix evenly with acetylene black and polytetrafluoroethylene at a mass ratio of 85:10:5, press it into a film with a thickness of about 1mm with a film laminator, and dry it fully in an oven at 120°C. The int...

Embodiment 3

[0036] Accurately weigh 1.0mol CH 3 COOLi·2H 2 O, 0.84mol MnC 2 o 4 2H 2 O, 0.92mol NH 4 h 2 PO 4 , 0.08mol Mn 2 AsO 4 (OH), mix evenly and add to the ball milling jar, then weigh 120g sucrose and add it to the ball milling jar, then add 180ml absolute ethanol as the mixing medium, use agate balls to fully ball mill for 4 hours, take the precursor out and dry it and place it in a tube In a type furnace, under the protection of high-purity argon, heated to 750°C at a heating rate of 8°C / min, and held for 4 hours to obtain a phosphate-doped modified lithium manganese phosphate cathode material LiMn(PO 4 ) 0.92 (AsO 4 ) 0.08 ;

[0037] The synthesized phosphate doped modified lithium manganese phosphate cathode material LiMn(PO 4 ) 0.92 (AsO 4 ) 0.08 Mix evenly with acetylene black and polytetrafluoroethylene at a mass ratio of 85:10:5, press it into a film with a thickness of about 1mm with a film laminator, and dry it fully in an oven at 120°C. The intercepted s...

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Abstract

The invention belongs to the field of lithium ion battery material preparation and particularly relates to a lithium ion battery doped modified lithium manganese phosphate cathode material and a preparation method thereof. The lithium ion battery cathode material is carbon-coated doped modified lithium manganese phosphate, the doped modified lithium manganese phosphate is composed of lithium source compound, manganese source compound, phosphate source compound and arsenate source compound in a molar ratio of Li:Mn:PO43-:AsO43-=1:1:(1-x):x, and the x is greater than 0 and is not greater than 0.15. Through partially replacing backbone phosphate radicals in the lithium manganese phosphate crystal with arsenates, electronegativity of arsenic is weaker than that of phosphorus, partial doping ofarsenates changes the energy state structure of the lithium manganese phosphate crystal, electronic conductivity and ionic conductivity of the lithium manganese phosphate crystal are improved, large-current charging and discharging capacity and cycle performance of the lithium manganese phosphate cathode material are greatly improved, and the preparation process is simple in operation, easy to control and is advantageous for realizing large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of lithium ion battery battery material preparation, and in particular relates to a lithium ion battery doped modified lithium manganese phosphate cathode material and a preparation method thereof. Background technique [0002] Lithium-ion power battery is currently the most potential vehicle battery, mainly composed of cathode material, anode material, diaphragm, electrolyte and other parts. At present, the research and development and production of anode materials are relatively mature. Cathode materials, separators and electrolytes are the core materials of lithium-ion batteries, among which cathode materials are the most critical. The technological breakthrough of cathode materials will play an important role in promoting the performance of lithium-ion power batteries. [0003] Although the performance advantages of lithium-ion batteries are obvious, the performance of lithium-ion batteries varies widely due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 袁正勇黄伟豪
Owner NINGBO POLYTECHNIC
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