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Aluminum and fluorine dual-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 problems such as poor electrochemical cycle performance and poor safety performance, and achieve the goals of reducing sensitivity, easy control, and enhanced transmission Effect

Inactive Publication Date: 2018-11-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to aim at lithium-ion battery cathode material layered high-nickel-nickel-cobalt lithium manganate (LiNi 0.8 mn 0.1 co 0.1 o 2 ) poor electrochemical cycle performance, poor safety performance, provide a lithium-ion battery cathode material Li(Ni 0.8 co 0.1 mn 0.1 ) 1-x al x o 2-y f y @LiAlO 2 and its preparation method, wherein 0

Method used

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  • Aluminum and fluorine dual-modified lithium ion battery cathode material and preparation method thereof
  • Aluminum and fluorine dual-modified lithium ion battery cathode material and preparation method thereof
  • Aluminum and fluorine dual-modified lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] When the doping amounts of Al and F are 0.02 and 0.01 respectively (that is, x=0.02, y=0.01), 2.2029g LiOH·H 2 O, 4.5704g precursor, 0.3789g Al(NO 3 ) 3 9H 2 O and 0.0132g LiF are mixed, with alcohol as a dispersant, fully ground evenly, then put in oven and dry and grind finely, put it into tube furnace at last under oxygen atmosphere (oxygen flow rate 400ml / min) with Heat up to 470°C at a speed of 3°C / min for 6 hours, then heat up to 780°C at a speed of 2°C / min and bake for 15 hours, then cool down naturally, take out the material and grind it finely to obtain Li(Ni 0.8 co 0.1 mn 0.1 ) 0.98 al 0.02 o 1.99 f 0.01 .

[0046] At the same time, LiAlO 2 When the coating amount is 0.2wt%, weigh 0.0064gLiNO 3 And 0.0193g complexing agent citric acid, be dissolved in appropriate amount of deionized water, stir constantly at room temperature, obtain mixed solution A, weigh 0.0345g Al(NO 3 ) 3 9H 2 O, dissolved in an appropriate amount of deionized water, added dr...

Embodiment 2

[0050] When the doping amounts of Al and F are 0.01 and 0.02 respectively (that is, x=0.01, y=0.02), 2.2029g LiOH·H 2 O, 4.6171g precursor, 0.1895g Al(NO 3 ) 3 9H 2 O and 0.0264g LiF are mixed, with alcohol as a dispersant, fully ground evenly, then put in oven and dry and grind finely, finally it is put into tube furnace under oxygen atmosphere (oxygen flow rate 400ml / min) with Heat up to 470°C at a speed of 3°C / min for 6 hours, then heat up to 780°C at a speed of 2°C / min and bake for 15 hours, then cool down naturally, take out the material and grind it finely to obtain Li(Ni 0.8 co 0.1 mn 0.1 ) 0.99 al 0.01 o 1.98 f 0.02 .

[0051] At the same time, LiAlO 2 When the coating amount is 0.2wt%, weigh 0.0064gLiNO 3 And 0.0193g complexing agent citric acid, be dissolved in appropriate amount of deionized water, stir constantly at room temperature, obtain mixed solution A, weigh 0.0345g Al(NO 3 ) 3 9H 2 O, dissolved in an appropriate amount of deionized water, added...

Embodiment 3

[0055] When the doping amounts of Al and F are 0.02 and 0.02 respectively (that is, x=0.02, y=0.02), 2.2029g LiOH·H 2 O, 4.5704g precursor, 0.3789g Al(NO 3 ) 3 9H 2 O and 0.0264g LiF are mixed, with alcohol as a dispersant, fully ground evenly, then put in oven and dry and grind finely, finally it is put into tube furnace under oxygen atmosphere (oxygen flow rate 400ml / min) with Heat up to 470°C at a speed of 3°C / min for 6 hours, then heat up to 780°C at a speed of 2°C / min and bake for 15 hours, then cool down naturally, take out the material and grind it finely to obtain Li(Ni 0.8 co 0.1 mn 0.1 ) 0.98 al 0.02 o 1.98 f 0.02 .

[0056] At the same time, LiAlO 2 When the coating amount is 0.2wt%, weigh 0.0064gLiNO 3 And 0.0193g complexing agent citric acid, be dissolved in appropriate amount of deionized water, stir constantly at room temperature, obtain mixed solution A, weigh 0.0345g Al(NO 3 ) 3 9H 2 O, dissolved in an appropriate amount of deionized water, added...

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Abstract

The invention belongs to the field of lithium ion batteries, and provides a lithium ion battery cathode material Li(Ni0.8Co0.1Mn0.1)1-xAlxO2-yFy@LiAlO2 and a preparation method thereof, wherein x is more than 0, and y is less than or equal to 0.05, and the defects of LiNi0.8Mn0.1Co0.1O2 has poor electrochemical cycle performance and poor safety performance are overcome. Aluminum and fluorine are co-doped in a matrix material, and the trivalent aluminum element not only can stabilize the structure of the material, but also can prevent Ni<2+> from substituting Li<+>, so that the mixing of lithium / nickel cations is reduced, and fluorine can inhibit side reaction between the material and electrolyte; at the same time, the surface of a parent material Li(Ni0.8Co0.1Mn0.1)1-xAlxO2-yFy is coated with an extremely thin lithium fast ion conductor lithium metaaluminate which can enhance the lithium ion transport and reduce the surface alkalinity; the lithium ion battery cathode material can havehigher discharge specific capacity while improving cycling stability, and has a more stable structure compared with LiNi0.8Co0.1Mn0.1O2, the safety and processing performance of the material are improved, and especially at large magnification and high voltage, the safety performance is greatly improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a lithium ion battery positive electrode material Li(Ni 0.8 co 0.1 mn 0.1 ) 1-x al x o 2-y f y @LiAlO 2 and a preparation method thereof, wherein 0<x, y≤0.05. Background technique [0002] With the increasing shortage of traditional fossil energy, environmental pollution, and climate warming, environmentally friendly new energy technologies have become one of the current development and application hotspots; among them, lithium-ion batteries rely on their high energy density. , small self-discharge, excellent cycle performance and no memory effect have become a vital part of the power battery field in the current new energy vehicle industry. [0003] Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, separators and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/46H01M10/0525
CPCH01M4/366H01M4/463H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘兴泉张美玲胡友作谭铭刘珊珊舒小会冉琪文李浩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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