Bismuth fluoride lithium ion cell anode material prepared through liquid phase synthesis and having B<3+> and La<3+> doped orthorhombic structure and preparation method of bismuth fluoride lithium ion cell anode material

A lithium-ion battery, liquid-phase synthesis technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc. Chemical properties, avoidance of side reaction products, low equipment requirements

Active Publication Date: 2015-07-22
嘉兴市燕知网络科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 extrem

Method used

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  • Bismuth fluoride lithium ion cell anode material prepared through liquid phase synthesis and having B&lt;3+&gt; and La&lt;3+&gt; doped orthorhombic structure and preparation method of bismuth fluoride lithium ion cell anode material

Examples

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Embodiment 1

[0021] Example 1: Prepare 200mL of aqueous solution A consisting of 5wt% bismuth nitrate, 1wt% dilute nitric acid, 0.1wt% boric acid, 0.1wt% lanthanum nitrate, and 0.1wt% ethanolamine; prepare 200mL of 15wt% ammonium fluoride, 0.1wt% %Aqueous solution B of polyvinylpyrrolidone with an average molecular weight between 20000-30000; the preparation composition is an aqueous solution of 0.1wt% perfluoroheptanoic acid and 0.1wt% polyethylene oxide and polylactic acid block copolymer PEO-b-PLA C; Put the aqueous solution C into a cylindrical reactor with a volume of 2L and an inner diameter of 15 cm to 1 / 3 of the total volume of the reactor, set the temperature of the aqueous solution C at 40°C and use a polytetrafluoroethylene with a diameter of 10 cm The vinyl paddle was agitated at a speed of 1250 rpm. 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...

Embodiment 2

[0022] Embodiment 2: preparation 300mL is composed of 15wt% bismuth nitrate, 0.5wt% boric acid, 0.4wt% lanthanum nitrate, 5wt% dilute nitric acid, 0.5wt% aqueous solution A of triethanolamine hydrochloride; preparation 300mL is composed of 45wt% ammonium fluoride, 0.5wt% aqueous solution B of polyvinyl alcohol with an average molecular weight of 10,000-20,000; the preparation composition is 0.5wt% 2,2-difluorocyclopropanecarboxylic acid and 0.5wt% polyethylene oxide and poly(1,2-butylene oxide) Aqueous solution C of block copolymer PEO-b-PBO; put aqueous solution C into a cylindrical reactor with a volume of 2L and an inner diameter of 20 cm to 1 / 2 of the total volume of the reactor, and set the temperature of aqueous solution C 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 / ...

Embodiment 3

[0023] Embodiment 3: preparation 250mL is composed of 10wt% bismuth nitrate, 0.3wt% boric acid, 0.3wt% lanthanum nitrate, 3wt% dilute nitric acid, 0.3wt% triethanolamine aqueous solution A; preparation 250mL is composed of 30wt% ammonium fluoride, 0.3 Aqueous solution B of wt% op-10; aqueous solution C composed of 0.3wt% perfluoroglutaric acid and 0.3wt% polyethylene oxide and poly-N-isopropylacrylamide block copolymer PEO-b-PNIPAM ;Put the aqueous solution C into a 2L volume cylindrical reactor with an inner diameter of 17 cm to 2 / 5 of the total volume of the reactor, set the temperature of the aqueous solution C at 50°C and use a polytetrafluoroethylene with a diameter of 12 cm The stirring paddle was stirred at a speed of 1350 rpm. 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 the aqueous solution A into t...

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Abstract

The invention discloses a bismuth fluoride lithium ion cell anode material prepared through liquid phase synthesis and having a B<3+> and La<3+> doped orthorhombic structure and a preparation method of the bismuth fluoride lithium ion cell anode material. According to the method, the orthorhombic-structure bismuth fluoride is prepared by taking a liquid phase reaction, designing the technological conditions and introducing a plurality of auxiliaries; the specific capacity and the electronic conductivity of the material are improved by doping B<3+> and La<3+>; when the bismuth fluoride material is used as the lithium ion cell anode material, the specific capacity of the bismuth fluoride material is higher than 200 mAh/g<-1>. The method is low in equipment requirement, high in product purity, capable of avoiding generation of multiple side reaction products, such as double salt, of bismuth fluoride in the liquid phase reaction, and excellent in electrochemical performance.

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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IPC IPC(8): H01M4/136H01M4/1397H01M4/139H01M4/13H01M4/62
CPCH01M4/136H01M4/362H01M4/582H01M4/626H01M10/0525Y02E60/10
Inventor 徐玲霞水淼徐晓萍陈超陈姝舒杰任元龙
Owner 嘉兴市燕知网络科技有限公司
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