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LiCoVO4 as well as preparation method and application thereof

A technology of lithium cobalt vanadate and cobalt acetate, applied in the field of lithium ion batteries, can solve the problems of irregular morphology and uneven particle size distribution of lithium cobalt vanadate.

Active Publication Date: 2017-12-15
苏州协鑫集成储能科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a cobalt vanadate with regular shape and uniform particle size distribution for the problems of irregular morphology and inhomogeneous particle size distribution of lithium cobalt vanadate obtained by the traditional preparation method of lithium cobalt vanadate Lithium and its preparation method and application

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  • LiCoVO4 as well as preparation method and application thereof
  • LiCoVO4 as well as preparation method and application thereof
  • LiCoVO4 as well as preparation method and application thereof

Examples

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preparation example Construction

[0028] like figure 1 The preparation method of shown cobalt lithium vanadate comprises the steps:

[0029] S10. Mix the lithium hydroxide aqueous solution and the ammonium metavanadate suspension evenly, and maintain the reaction temperature above 75° C. until a colorless and clear solution is obtained.

[0030] Preferably, the molar concentration of lithium hydroxide in the lithium hydroxide aqueous solution is 0.4mol / L to 0.6mol / L, and the molar concentration of ammonium metavanadate in the ammonium metavanadate suspension is 0.4mol / L ~0.6mol / L.

[0031] Preferably, when the lithium hydroxide aqueous solution and the ammonium metavanadate suspension are uniformly mixed, the temperature of the ammonium metavanadate suspension is maintained at 75° C. to 85° C. The solubility of ammonium metavanadate in normal temperature water is small, so the temperature of ammonium metavanadate suspension is maintained at 75°C to 85°C. On the one hand, the solubility of ammonium metavanada...

Embodiment 1

[0064] Preparation of lithium cobalt vanadate:

[0065] Add lithium hydroxide aqueous solution dropwise to the ammonium metavanadate suspension, maintain the reaction temperature at 80°C, keep warm and keep stirring until a colorless and clear solution is obtained.

[0066] Add the above colorless and clear solution dropwise to the cobalt acetate aqueous solution, maintain the reaction temperature at 80°C, keep it warm for 45min, and obtain a light yellow suspension after sufficient reaction. Among them, the solubility of the light yellow suspension is 1mol / L.

[0067] Put the above light yellow suspension into an ultrasonic mixer and mix for 30 minutes, then put the light yellow suspension into a closed high temperature and high pressure resistant reaction kettle. Put the reaction kettle with the light yellow suspension into the homogeneous reactor, maintain the reaction temperature at 200° C., and the reaction time at 20 h. After the reaction was completed, it was cooled n...

Embodiment 2

[0069] Preparation of lithium-ion batteries:

[0070] A PVDF (polyvinylidene fluoride) solution with a mass fraction of 4% was prepared: the PVDF was placed in a vacuum drying oven, dried overnight at 80° C., and then 2 g of PVDF was weighed for use. Weigh 48g of NMP (N-methylpyrrolidone) and pour it into the reagent bottle, slowly pour the weighed PVDF into the NMP, then seal the bottle mouth with a parafilm, put it into a constant temperature heating magnetic stirrer and heat at 50°C, Continue for 20 hours until the PVDF solution becomes a uniform transparent viscous liquid, ready for use.

[0071] The lithium cobalt vanadate and graphite powder in Example 1 were vacuum-dried at 80° C. for use. Weigh 0.6 g lithium cobalt vanadate and 0.075 g graphite powder of Example 1, and vibrate and mix the lithium cobalt vanadate and graphite powder of Example 1. Put the mixed powder into an agate mortar and grind for 3 to 5 minutes, then prepare PVDF according to the mass ratio of co...

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Abstract

The invention relates to LiCoVO4 as well as a preparation method and an application thereof. The preparation method of LiCoVO4 comprises the following steps: a lithium hydroxide aqueous solution is uniformly mixed with an ammonium metavanadate suspension, and a reaction temperature is kept at 75 DEG C or higher until a colorless settled solution is obtained; the colorless settled solution and a cobalt acetate aqueous solution are uniformly mixed, the reaction temperature is kept at 75 DEG C or higher until a pale yellow suspension is obtained; the pale yellow suspension is subjected to a hydrothermal reaction, the reaction temperature is kept at 160-220 DEG C, the reaction time is kept for 18-24 h, and LiCoVO4 is obtained. With adoption of the preparation method of LiCoVO4, morphology of obtained LiCoVO4 can be controlled, obtained LiCoVO4 is regular in morphology, particles are smaller and uniform, and diffusion of Li ions is facilitated, so that the application is facilitated.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to lithium cobalt vanadate and its preparation method and application. Background technique [0002] Lithium-ion batteries are one of the most promising energy sources for applications in large-scale energy storage systems such as electric vehicles (EV) and plug-in hybrid electric vehicles (PHEV). Lithium iron phosphate (LiFePO 4 ). However, the lithium iron phosphate cathode material has the disadvantages of low discharge voltage (3.2V) and medium specific capacity, resulting in low energy density, and is gradually not in an advantageous position in electric vehicle applications. [0003] Lithium cobalt vanadate (LiCoVO) with a spinel structure 4 ) has high energy density, high battery voltage, low cost and relative to LiCoO 2 and LiMnO 2 The advantage of low toxicity makes it the most promising electrode material in rechargeable batteries. [0004] The traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/525H01M10/0525
CPCH01M4/131H01M4/525H01M10/0525Y02E60/10
Inventor 相江峰李文平郝三存
Owner 苏州协鑫集成储能科技有限公司
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