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Surface coating method of 5V lithium ion battery positive pole material LiNi0.5-xMn1.5MxO4

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrode manufacturing, electrode heat treatment, etc., can solve the problems of electrode charge and discharge capacity and cycle reversible capacity decay, low initial discharge capacity, poor cycle performance, etc. And cycle performance, high reversible specific capacity, and the effect of improving conductivity

Active Publication Date: 2013-05-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for lithium battery cathode materials, under the existing electrolyte system, especially the high voltage spinel LiNi0.5-x Mn1.5Mx O4 materials, a common problem is: with the increase of the number of cycles, the charge-discharge capacity and cycle reversible capacity of the electrode gradually decay, that is, the battery life is short
After 500 cycles, the capacity retention rate of the material is 93.02%, but the initial discharge capacity is relatively low
[0008] Patent CN102005563A discloses a lithium-doped Al2O3 coated LiNi0.5Mn1.5O4 method, the highest first discharge specific capacity of the obtained material is 137mAh / g, but the cycle performance is relatively poor, 0.2C charge and discharge 50 times The rear capacity retention rate is only 88.5%

Method used

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  • Surface coating method of 5V lithium ion battery positive pole material LiNi0.5-xMn1.5MxO4
  • Surface coating method of 5V lithium ion battery positive pole material LiNi0.5-xMn1.5MxO4
  • Surface coating method of 5V lithium ion battery positive pole material LiNi0.5-xMn1.5MxO4

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Experimental program
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Effect test

Embodiment 1

[0037] 5g active material LiNi 0.48 mn 1.5 Fe 0.02 o 4 Grind and mix with 0.5g acetylene black, disperse in 25ml of absolute ethanol, and ultrasonically pulverize for 20min; mix the above mixture together with ethanol by ball milling for 3h, dry at 80°C for 3h, grind and pulverize; calcine in a nitrogen atmosphere at a constant temperature of 300°C for 1h , and then the furnace is lowered to room temperature, and the carbon-coated high-voltage positive electrode material is obtained by grinding.

[0038] Electrolyte of EC:EMC:DMC (1:1:1, V / V) was used to assemble a 2016 button battery with metal lithium as the negative electrode. The capacity retention rate of 500 times of 2C cycles was tested on the Land charge and discharge tester. 95%.

Embodiment 2

[0040] 5g active material LiNi 0.45 mn 1.5 Ti 0.05 o 4 Grind and mix with 2g of sucrose, disperse in 25ml of absolute ethanol, and ultrasonically pulverize for 20min; mix the above mixture together with ethanol by ball milling for 2h, dry at 80°C for 3h, grind and pulverize; calcinate at constant temperature at 300°C for 3h in a nitrogen atmosphere, and then With the furnace down to room temperature, the carbon-coated high-voltage positive electrode material can be obtained by grinding.

[0041] Electrolyte of EC:EMC:DMC (1:1:1, V / V) was used to assemble a 2016 button battery with metal lithium as the negative electrode. The discharge capacity at 5C rate was 127mAh when tested on the Land charge and discharge tester. / g, which is 98% of 0.2C.

Embodiment 3

[0043] 5g active material LiNi 0.45 mn 1.5 Mg 0.05 o 4 Grind and mix with 0.5g acetylene black, disperse in 25ml of absolute ethanol, and ultrasonically pulverize for 20min; mix the above mixture together with ethanol by ball milling for 3h, dry at 80°C for 3h, grind and pulverize; calcine in a nitrogen atmosphere at a constant temperature of 300°C for 1h , and then the furnace is lowered to room temperature, and the carbon-coated high-voltage positive electrode material is obtained by grinding.

[0044] Electrolyte of EC:EMC:DMC (1:1:1, V / V) was used to assemble a 2016 button battery with metal lithium as the negative electrode. The discharge capacity at 5C rate was 128mAh when tested on the Land charge and discharge tester. / g, the capacity retention rate of 500 cycles at 2C is 96%.

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Abstract

The invention discloses a surface coating method of a 5V lithium ion battery positive pole material LiNi0.5-xMn1.5MxO4, which comprises the following steps: (1) grinding and mixing a coating material or precursor thereof and a positive pole active material in a mass ratio of (1-50):100; (2) dispersing the mixture in a certain liquid-phase medium, and carrying out ultrasonic pulverization; (3) mixing the mixture and the medium by ball milling; (4) filtering and drying; and (5) putting the dried mixture in the step (4) into a pipe furnace, heating in inert gas at the heating speed of 1-30 DEG C / minute, calcining at the constant temperature of 200-500 DEG C for 1-5 hours, carrying out quick cooling or furnace cooling to room temperature, and grinding the coated high-voltage lithium ion battery positive pole material LiNi0.5-xMn1.5MxO4. The product obtained by the method disclosed by the invention has high reversible specific capacity: the capacity retentivity after 500 2C charging / discharging cycles is higher than 95%, and the specific capacity of 5C discharge is more than 96% of 0.2C. The method has the advantages of simple and controllable synthesis technique and uniform coating, and is suitable for industrial production.

Description

Technical field [0001] The present invention involves a surface covering method of a high -voltage positive material, especially a 5V lithium ion [0002] Battery positive material lini 0.5-x Mn 1.5 M x O 4 The surface covering method belongs to the field of material synthesis. Background technique [0003] The current commercialized lithium -ion battery positive materials include layered structure LICOO 2 , LIFEPO of Olive Structure 4 And limn of spinel structure 2 O 4 EssenceLamdium cobaltate materials, due to the scarcity of resources, expensive prices, not environmental protection, and poor safety. It is not suitable as a popular power battery material and can only be used on miniaturized portable equipment.Although lithium iron phosphates of olives have the advantages of low price, environmental protection, and good platform performance, there are shortcomings such as low rectification, difficulty in coating, and poor multiplier performance. It restricts its application on p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/131H01M4/505H01M4/366H01M4/0471Y02E60/10
Inventor 许鹏赵本好杨尘杨续来刘大军谢佳李缜
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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