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A kind of preparation method of lithium ion battery cathode material licobo3

A technology for lithium-ion batteries and cathode materials, which is applied in the field of preparing LiCoBO3 cathode materials, can solve problems such as product performance differences, and achieve the effects of performance improvement, energy saving, and lower reaction temperature

Active Publication Date: 2018-06-01
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the current LiCoBO 3 There are many studies on the preparation method, but the performance of the obtained product is still very different from the theory. In view of this, the present invention provides a method for preparing LiCoBO 3 new method

Method used

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  • A kind of preparation method of lithium ion battery cathode material licobo3
  • A kind of preparation method of lithium ion battery cathode material licobo3
  • A kind of preparation method of lithium ion battery cathode material licobo3

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Comparison scheme
Effect test

Embodiment 1

[0032] 1.019g Li 2 CO 3 , 1.734g LiOH and 7.493g CoO are dispersed in absolute ethanol and mixed and ball milled for 1 hour, dried and sintered at 500°C for 1 hour under an inert atmosphere, and then cooled with the furnace to obtain the precursor (I); according to the content of cobalt and boron The ratio of the amount of substances is 1:1 and weigh H 3 BO 3 , and the precursor (I) and boric acid were dispersed in absolute ethanol and ball milled for 3 hours, dried and then sintered at 200°C for 3 hours and 600°C for 8 hours under an inert atmosphere, and then cooled with the furnace.

[0033] The XRD pattern of the obtained product is as follows figure 1 shown. Depend on figure 1 It can be seen that the monoclinic LiCoBO was synthesized at 600°C 3 There are no other impurity peaks in the spectrum, and the product is of high purity. Depend on figure 2 It can be seen that the sample particles are uniformly distributed and the size is about 1 μm.

Embodiment 2

[0035] 1.019g Li 2 CO 3 , 1.734g LiOH and 7.493g CoO were dispersed in absolute ethanol and mixed and ball milled for 4 hours, dried and sintered at 450°C for 4 hours under an inert atmosphere, and then cooled with the furnace to obtain the precursor (I); according to the content of cobalt and boron The ratio of the amount of substances is 1:1 and weigh H 3 BO 3 , account for 10% of the total mass of the positive electrode material by weighing Ketjen black according to the amount of residual carbon, disperse the precursor (I), boric acid and Ketjen black in absolute ethanol and ball mill for 2 hours, and dry it under an inert atmosphere at 180 ℃ sintering for 4 hours, sintering at 500 ℃ for 8 hours, and then cooling with the furnace.

[0036] The XRD pattern of the obtained product is as follows image 3 shown. Depend on image 3 It can be seen that monoclinic LiCoBO was synthesized at 500 °C 3 / Ketjen black composite cathode material, there are no other impurity peaks...

Embodiment 3

[0038] 1.663g Li 2 CO 3 , 2.830g LiOH and 11.894g CoCO 3 Dispersed in absolute ethanol and mixed, ball milled for 0.5 hours, dried and sintered at 600°C for 2 hours under an inert atmosphere, and then cooled with the furnace to obtain the precursor (I); according to LiCoBO 3 , Li 2 O-2B 2 o 3 The ratio of the amount of the substance is 1:0.316 and weighed H 3 BO 3 , and disperse the precursor (I) and boric acid in absolute ethanol and ball mill for 5 hours, dry and sinter at 350°C for 2 hours in an inert atmosphere, sinter at 700°C for 2 hours, and then cool with the furnace to obtain LiCoBO 3 / Li 2 O-2B 2 o 3 composite material.

[0039] The XRD pattern of the obtained product is as follows Figure 6 shown. Depend on Figure 6 It can be seen that the monoclinic LiCoBO was synthesized at 700 °C 3 There are no other impurity peaks in the spectrum, and the product is of high purity.

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Abstract

The invention discloses a preparation method for a cathode material LiCoBO3 of a lithium ion battery. The method comprises the following steps: dispersing lithium hydroxide, lithium carbonate, cobalt oxide or cobalt carbonate in absolute ethyl alcohol for mixing and ball milling, performing sintering for 1 to 4 hours at 450 to 600 DEG C in an inert atmosphere after drying, and performing furnace cooling to obtain a precursor (I); dispersing the precursor (I) and boric acid in absolute ethyl alcohol for mixing and ball milling, and performing sintering for 1 to 4 hours at 180 to 350 DEG C in the inert atmosphere to obtain a precursor (II) after drying; sintering the precursor (II) for 2 to 10 hours at 450 to 700 DEG C in the inert atmosphere, and performing cooling to obtain a product. In preparation process, carbon doping and Li2O-2B2O3 doping can also be performed. According to the method, the reaction temperature is reduced, and the reaction time is obviously shortened, so that the production cost is remarkably reduced, and energy resources are saved; in addition, the discharge specific capacity and cycling stability of the obtained product are both obviously improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, in particular to a method for preparing LiCoBO 3 methods for cathode materials. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, no memory effect, small self-discharge, and long cycle life. They can be used for mobile phones, notebook computers, electric vehicles, solar and wind energy storage, and smart grid construction. From the perspective of the development of electrode materials, the development of cathode materials lags behind that of anode materials, and cathode materials are crucial to improving the electrochemical performance of lithium-ion batteries such as operating voltage, specific energy, and cycle life. Therefore, the cathode material of lithium-ion batteries is the key to the development of lithium-ion batteries. Polyanionic materials have the advantages of stable structure, high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M4/5825H01M10/0525H01M2004/028H01M2220/20H01M2220/30Y02E60/10
Inventor 唐安平钟倩雯徐国荣刘立华宋海申
Owner HUNAN UNIV OF SCI & TECH