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A kind of liquid phase synthesis of bismuth fluoride lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of high-capacity bismuth fluoride composite lithium battery positive electrode materials, can solve the problems of low electronic conductivity, high cost, harsh process conditions, etc., and achieves high purity, low equipment requirements, and avoidance of Effects of by-reaction products

Active Publication Date: 2017-07-25
恩可(嘉兴)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional synthesis method of bismuth fluoride is to react with hydrogen fluoride gas and metal oxide / hydroxide or fluorine gas and metal element at high temperature. The process conditions are harsh, the equipment requirements are very high, and the energy consumption is high, so the price is very expensive.
However, the preparation of bismuth fluoride by liquid phase reaction is often unable to be used as a positive electrode material because the by-product content is too high, and it is also uneconomical due to the high cost of waste liquid.
Bismuth fluoride, as a cathode material for lithium-ion secondary batteries, also has a negative characteristic that its electronic conductivity is extremely low, so it will cause a high polarization voltage during charge and discharge.

Method used

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  • A kind of liquid phase synthesis of bismuth fluoride lithium ion battery cathode material and preparation method thereof

Examples

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Embodiment 1

[0016] Example 1: Prepare 200mL of aqueous solution A composed of 5wt% bismuth nitrate, 1wt% dilute nitric acid, and 0.1wt% ethanolamine; Aqueous solution B of vinylpyrrolidone; Aqueous solution C of 0.1wt% perfluoroheptanoic acid was prepared; Aqueous solution C was put into a 2L volume and an internal diameter of 15 cm was in a cylindrical reactor to 1 / 3 of the total volume of the reactor; Aqueous solution C The temperature was set at 40 °C while stirring at a speed of 1250 rpm using a Teflon stirring impeller with a diameter of 10 cm. Use a peristaltic pump to simultaneously pump the aqueous solution A and the aqueous solution B into the reactor at a speed of 0.1 mL / min until all the prepared aqueous solutions A and B are pumped out. The inlet of aqueous solution A into the reactor and the inlet of aqueous solution B into the reactor are on the same plane and located on a circle centered on the shaft of the stirring paddle, and the connecting line between the two passes thr...

Embodiment 2

[0017]Example 2: Prepare 300mL of aqueous solution A composed of 15wt% bismuth nitrate, 5wt% dilute nitric acid, and 0.5wt% triethanolamine hydrochloride; prepare 300mL of ammonium fluoride with a composition of 45wt%, and 0.5wt% polyethylene with an average molecular weight of 10000-20000 Aqueous solution B of alcohol; prepare aqueous solution C of 0.5wt% 2,2-difluorocyclopropanecarboxylic acid; put aqueous solution C into a 2L volume, and an internal diameter of 20 cm in a cylindrical reactor to 1 / 2 of the total volume of the reactor At , the temperature of the aqueous solution C was set at 60 °C while stirring at a speed of 1500 rpm using a polytetrafluoroethylene stirring paddle with a diameter of 15 cm. Use a peristaltic pump to simultaneously pump the aqueous solution A and the aqueous solution B into the reactor at a rate of 1 mL / min until all the prepared aqueous solutions A and B are pumped out. The inlet of aqueous solution A into the reactor and the inlet of aqueous...

Embodiment 3

[0018] Embodiment 3: preparation 250mL is composed of 10wt% bismuth nitrate, 3wt% dilute nitric acid, 0.3wt% triethanolamine aqueous solution A; preparation 250mL is composed of 30wt% ammonium fluoride, 0.3wt% op-10 aqueous solution B; preparation 0.3 Aqueous solution C of wt% perfluoroglutaric acid; put aqueous solution C into a 2L volume, and an internal diameter of 17 cm in a cylindrical reactor to 2 / 5 of the total volume of the reactor, set the temperature of aqueous solution C at 50°C and simultaneously Agitate at a speed of 1350 rpm using a Teflon stirring paddle with a diameter of 12 cm. Use a peristaltic pump to simultaneously pump the aqueous solution A and the aqueous solution B into the reactor at a speed of 0.5 mL / min until all the prepared aqueous solutions A and B are pumped out. The inlet of aqueous solution A into the reactor and the inlet of aqueous solution B into the reactor are on the same plane and located on a circle centered on the shaft of the stirring ...

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Abstract

The invention relates to a liquid-phase bismuth fluoride lithium ion battery positive electrode material and a preparation method thereof. The method is characterized in that bismuth fluoride is prepared through designing technologic conditions and introducing various assistants through a liquid phase reaction, and the bismuth fluoride material can be used as a lithium ion battery positive electrode material and has a specific capacity exceeding 200mAh.g<-1>. The method has the advantages of low requirements on a device, high product purity, and avoiding of generation of various double salts of bismuth fluoride, and other side reaction products in the liquid phase reaction.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing a high-capacity bismuth fluoride composite lithium battery cathode material. Background technique [0002] Lithium-ion secondary batteries have the absolute advantages of high volume, weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. Currently, the global mobile power market has an annual share of more than 30 billion US dollars and Gradually grow at a rate of more than 10%. Especially in recent years, with the gradual depletion of fossil energy, new energy sources such as solar energy, wind energy, and biomass energy have gradually become alternatives to traditional energy sources. Among them, wind energy and solar energy are intermittent, and a large amount of energy is used simultaneously to meet the needs of continuous power supply. Energy storage batteries; urban air quality problems caused by automobi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01D15/04
CPCY02E60/10
Inventor 徐玲霞水淼徐晓萍陈超陈姝舒杰任元龙
Owner 恩可(嘉兴)科技有限公司
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