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
CN103094552AActive Publication Date: 2013-05-08HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI GUOXUAN HIGH TECH POWER ENERGY
Publication Date
2013-05-08

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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