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a co 2 alo 4 Materials and their preparation methods and applications

A technology of negative electrode material and precursor, applied in the field of negative electrode material of lithium ion battery, can solve the problems of low electronic conductivity, large volume expansion, poor cycle performance, etc., and achieve the effects of low equipment requirements, low cost, and good application prospects.

Active Publication Date: 2020-03-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of general transition metal oxides such as low electronic conductivity and large volume expansion during charge and discharge, the cycle performance is poor.

Method used

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  • a co <sub>2</sub> alo <sub>4</sub> Materials and their preparation methods and applications
  • a co <sub>2</sub> alo <sub>4</sub> Materials and their preparation methods and applications
  • a co <sub>2</sub> alo <sub>4</sub> Materials and their preparation methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Co in this example 2 AlO 4 The preparation method of material comprises the following steps:

[0031] (1) Weigh Co according to the ratio of the molar ratio of cobalt and aluminum to 2:1 3 o 4 and Al 2 o 3 , 400r / min ball milling at room temperature for 3h to obtain a homogeneously mixed precursor material;

[0032] (2) Divide the precursor material prepared in step (1) into 3 parts, and -1 The heating rate was raised to 800°C, and sintered at a constant temperature for 6h, 15h, and 20h respectively, and finally cooled to room temperature naturally to obtain Co 2 AlO 4 Material.

[0033] The Co produced in this embodiment at different sintering times 2 AlO 4 The material was assembled into a button lithium-ion battery, and its charge and discharge capacity and rate performance were measured. In the voltage range of 0.01 ~ 3V, test 100mA·g -1 and 1000mA·g -1 The charge and discharge performance under the rate, its detailed data are shown in Table 1.

[0034...

Embodiment 2

[0041] Co in this example 2 AlO 4 The preparation method of material comprises the following steps:

[0042] (1) Dissolve soluble cobalt nitrate and aluminum nitrate in water at a molar ratio of cobalt to aluminum of 2:1, and stir for 0.5 h at 25°C to obtain a uniformly mixed solution with a metal ion concentration of 0.5 mol / L ; b. Spray drying the resulting solution at 200°C to obtain the precursor material;

[0043] (2) Divide the precursor material prepared in step (1) into three parts, and -1 The heating rate was raised to 600°C, 700°C, and 800°C for sintering at a constant temperature for 16 hours, and finally the temperature was naturally lowered to room temperature to obtain Co 2 AlO 4 Material.

[0044] Co produced at different sintering temperatures in this example 2 AlO 4 The material is used as the negative electrode material and assembled into a button lithium-ion battery to measure its charge and discharge capacity and rate performance. In the voltage ran...

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Abstract

The invention discloses a Co2AlO4 material and a preparation method and application thereof. The preparation method of the Co2AlO4 material comprises the following steps: evenly mixing cobalt with aluminum to obtain a precursor material at the molar ratio of 2:1; and sintering the mixture through a solid phase and preparing to obtain a Co2AlO4 anode material. The method is low in cost, by the preparation method, the synthesis period is short, synthesis conditions are easily controlled, a synthesis method is simple, and large-scale production is realized easily. Co2AlO4 prepared by the method is used as the anode material of a lithium ion battery and has quite excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, in particular to a Co 2 AlO 4 The material, its preparation method and its application as a negative electrode material for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have excellent properties such as high specific energy, no memory effect, and environmental friendliness, and have been widely used in portable mobile devices such as mobile phones and notebook computers. As a power battery, lithium-ion batteries also have broad application prospects in electric bicycles and electric vehicles. At present, the negative electrode material of lithium ion battery mainly adopts graphite material. Although graphite material has good cycle stability, its capacity is low, the theoretical capacity is only 372mAh g -1 . The new generation of lithium-ion batteries puts forward higher requirements on the specific capacity of electrode mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/52H01M10/0525
CPCH01M4/483H01M4/523H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 李新海曾科文王志兴郭华军王接喜李滔
Owner CENT SOUTH UNIV