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LiAlO2/C modified ternary composite material as well as preparation method and application thereof

A technology of composite materials and powder materials, which is applied in the field of preparation of LiAlO2/C modified ternary composite materials, can solve the problems of poor high-rate performance, low tap density, capacity attenuation, etc., and achieve improved rate performance and Effects of cycle stability, erosion reduction, and protection of material structure

Active Publication Date: 2018-08-28
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention proposes a LiAlO 2 / C modified ternary composite material and its preparation method and application solve the problem of ternary material LiNi in the prior art 1 / 3 co 1 / 3 mn 1 / 3 o 2 The technical problems of low conductivity, poor performance of large rate, low tap density and serious capacity fading, and the preparation method effectively improves the ternary material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Rate performance and cycle stability when used as a cathode for lithium-ion batteries

Method used

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  • LiAlO2/C modified ternary composite material as well as preparation method and application thereof
  • LiAlO2/C modified ternary composite material as well as preparation method and application thereof
  • LiAlO2/C modified ternary composite material as well as preparation method and application thereof

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preparation example Construction

[0028] The invention provides a LiAlO 2 / C modifies the preparation method of ternary composite material, comprises the following steps:

[0029] Step 1: Mix lithium source solution, nickel salt solution, cobalt salt solution and manganese salt solution to obtain the first mixed solution; wherein, the concentrations of lithium source solution, nickel salt solution, cobalt salt solution and manganese salt solution are preferably 0.01~ 5mol / L, more preferably 0.01mol / L, 1mol / L, 2.5mol / L, 4mol / L or 5mol / L; among them, the lithium source is preferably lithium dihydrogen phosphate, lithium acetate, lithium fluoride, perchloric acid One or more of lithium, lithium hexafluorophosphate, lithium carbonate and lithium hydroxide, more preferably lithium hydroxide, lithium acetate or lithium carbonate; the nickel salt is preferably nickel nitrate, nickel sulfate and or nickel acetate; the cobalt salt is preferably nitric acid Cobalt, cobalt sulfate or cobalt acetate; the manganese salt i...

Embodiment 1

[0049] 1. Dissolve lithium hydroxide, nickel sulfate, cobalt sulfate and manganese sulfate in deionized water respectively to prepare four aqueous solutions with a concentration of 0.01mol / L, and mix the four solutions, wherein the hydroxide of these four solutions The molar ratio of lithium, nickel sulfate, cobalt sulfate and manganese sulfate is 3:1:1:1.

[0050] 2. Add citric acid to the above mixed solution according to the molar ratio of metal ions and citric acid in the above mixed solution is 1:1.

[0051] 3. Stir the mixed solution obtained above at 100°C for 10 hours, evaporate all the deionized water to obtain a gel substance, and then vacuum-dry it in a vacuum oven at a temperature of 100°C for 12 hours, then take out the dry matter and perform ball milling.

[0052] 4. Finally, the crushed powder material was sintered in the air atmosphere from 25°C to 500°C at 1°C / min for 5 hours, then raised to 750°C in the air atmosphere at 1°C / min and kept for 8 hours, and natu...

Embodiment 2

[0061] 1. Dissolve lithium acetate, nickel nitrate, cobalt nitrate and manganese nitrate in deionized water respectively to prepare four aqueous solutions with a concentration of 1mol / L, and mix the four solutions, wherein the lithium acetate and nitric acid of these four solutions The molar ratio of nickel, cobalt nitrate and manganese nitrate is 3:1:1:1.

[0062] 2. Add glycine to the above mixed solution according to the molar ratio of metal ions and glycine in the above mixed solution is 1:2.

[0063] 3. The mixed solution obtained above was stirred at 120° C. for 12 hours, and all the deionized water was evaporated to dryness to obtain a gel substance, which was then vacuum-dried in a vacuum drying oven at a temperature of 120° C. for 13 hours, and then the dried product was taken out and crushed by ball milling.

[0064] 4. Finally, the crushed powder material was sintered in the air atmosphere from 25°C to 530°C at 2°C / min for 6 hours, then raised to 800°C at 2°C / min in...

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Abstract

The invention relates to the technical field of lithium ion battery manufacturing, and discloses an LiAlO2 / C modified ternary composite material as well as a preparation method and application thereof. A lithium source, an aluminum source and an organic carbon source are dissolved into a solvent to obtain a mixed solution; then, layered structure LiNi1 / 3Co1 / 3Mn1 / 3O2 is added; evaporation to dryness is performed to obtain gel substrates; drying, crushing and sintering are performed; the LiAlO2 / C modified ternary composite material is finally obtained. The problems of low conductivity, poor high-rate performance, low tap density and serious volume attenuation of a ternary material LiNi1 / 3Co1 / 3Mn1 / 3O2 in the prior art are solved. The preparation method provided by the invention is simple; theoperation is easy; on the basis that the material microscopic structure is not changed, the surface modification is performed through LiAlO2 / C; the rate performance and the circulation stability of the ternary material LiNi1 / 3Co1 / 3Mn1 / 3O2 as a lithium ion battery positive electrode can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacturing, in particular to a LiAlO 2 / C modified ternary composite material and its preparation method. Background technique [0002] Lithium-ion batteries, due to their advantages such as high working voltage, high energy density, light weight, small size, low self-discharge rate, long cycle life, no memory effect, and environmental friendliness, make them rapidly become increasingly popular in notebook computers, cameras, mobile phones, etc. The main power supply of miniaturized and functional electronic products. Lithium-ion batteries are composed of four core parts: positive electrode, negative electrode, electrolyte and separator. The cathode material in commercial lithium-ion batteries is mainly LiMn 2 o 4 、LiCoO 2 、LiFePO 4 and ternary materials. Ternary material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 It has the characteristics of high specific capacity, excellent cycle perf...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 何苗冯叶锋王润熊德平
Owner GUANGDONG UNIV OF TECH
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