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Preparation method of cobalt lithium phosphate serving as positive material of lithium ion battery

A lithium ion battery, lithium cobalt phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of harsh synthesis conditions, low synthesis temperature, and long preparation cycle, and achieve high batch stability, Less side reactions, easy to amplify effect

Active Publication Date: 2014-04-30
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the advantages of low synthesis temperature, small particle size, narrow particle size distribution, and large specific surface area, but it has strict requirements on synthesis conditions and long preparation cycle.

Method used

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  • Preparation method of cobalt lithium phosphate serving as positive material of lithium ion battery
  • Preparation method of cobalt lithium phosphate serving as positive material of lithium ion battery
  • Preparation method of cobalt lithium phosphate serving as positive material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 2.4908g of cobalt acetate (analytical pure) and 1.0202g of lithium acetate (analytical pure), dissolve them in 100ml of absolute ethanol to prepare a 0.1M solution; then weigh 1.1529g of phosphoric acid (analytical pure, ≥85%) Dissolve in 100ml absolute ethanol to configure 0.1M solution. The above two solutions were mixed and stirred for 10 minutes, centrifuged and washed 3 times, and then dried in an oven at 80° C. to obtain a mixture of cobalt phosphate and lithium phosphate powder. The mixture was calcined in a muffle furnace at 650 °C for 10 h to obtain pure phase LiCoPO 4 crystals. figure 1 is the XRD pattern of the obtained sample. It can be seen from the figure that the diffraction peak of the XRD pattern of the synthesized product is similar to that of LiCoPO 4 The standard card is in good agreement without any spurious peaks.

Embodiment 2

[0025] Synthesis of LiCoPO 4 / carbon composite material, the mixture of cobalt phosphate and lithium phosphate powder obtained in Example 1 is put into an agate jar together with 0.2g glucose, add appropriate agate balls and dehydrated alcohol, and ball mill 5h with the rotating speed of 450r / min on the ball mill , to obtain the precursor. The obtained precursor was placed in a tube atmosphere furnace (ultra-pure Ar gas), pre-calcined at 350 °C for 5 h, and calcined at 650 °C for 10 h to obtain LiCoPO 4 / carbon composite. figure 2 is LiCoPO 4 / XRD patterns of carbon composites, diffraction peaks and LiCoPO 4 The standard card is in good agreement without any spurious peaks. image 3 is the SEM picture of the obtained sample, and the particle size is about 100-300nm. Figure 4 For a button-type simulated battery assembled with this material as the positive electrode and metal lithium as the negative electrode, the charge-discharge curve at a rate of 0.1C, the first disc...

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Abstract

The invention discloses a preparation method of cobalt lithium phosphate serving as a positive material of a lithium ion battery. The method comprises the following steps: (1) preparing an amorphous nanometer cobalt phosphate-lithium phosphate mixture serving as a precursor; and (2) performing high-temperature sintering. By adopting the method, the cobalt lithium phosphate can be synthesized efficiently, and the particle size and product purity are controlled, so that the electrochemical performance is improved. The method has the advantages that the precursor is uniform in mixing, side reactions are few, the process flow is simple and amplification is easy.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of positive electrode materials for lithium ion batteries, and in particular relates to a preparation method of lithium cobalt phosphate, a positive electrode material for lithium ion batteries. Background technique [0002] Due to the increasingly scarce energy problem and the increasingly serious environmental pollution, the development of high-energy-density batteries as power sources for vehicles has become one of the top priorities today, and safety performance is also one of the factors that cannot be ignored. Lithium cobalt phosphate (LiCoPO) with olivine type 4 ), the theoretical discharge specific capacity is 167mAh / g, and the potential relative to the lithium electrode is as high as 4.8V. Thanks to the stable crystal structure and high safety, it is expected to become one of the candidates for high-energy, high-voltage power lithium-ion batteries one. However, LiCoPO 4 Its...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 杨晖张志鹏朱华君
Owner NANJING UNIV OF TECH
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