Non-acid system liquid phase synthesized C/Bi/BiF3 composite bismuth fluoride lithium ion battery positive electrode material and preparation method thereof

A technology for compounding bismuth fluoride and lithium ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the adverse effects of charge and discharge capacity, discharge potential charge and discharge capacity retention ability, high polarization voltage, and harsh process conditions and other problems, to achieve excellent electrochemical performance, reduce kinetic obstacles, and avoid side reaction products.

Inactive Publication Date: 2017-07-21
宁波吉电鑫新材料科技有限公司
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  • Description
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  • 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 content of by-products is too high. At the same time, the dilute nitric acid added to inhibit the hydrolysis of bismuth nitrate in water has the risk of producing highly toxic hydrogen fluoride by reacting with ammonium fluoride.
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.
Although some researchers have used carbon black mixed with ball milling to increase the electrical conductivity of the material, it is still difficult for granular carbon black to form a complete conductive link, which greatly improves its electronic conductivity.
Finally, the material produces a new phase of metal bismuth and lithium fluoride during discharge, and the small particles of the new phase are kinetically disadvantaged in the initial stage of formation, so the maintenance of the subsequent charge and discharge capacity, discharge potential, and charge and discharge capacity ability to adversely affect

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  • Non-acid system liquid phase synthesized C/Bi/BiF3 composite bismuth fluoride lithium ion battery positive electrode material and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: put bismuth nitrate pentahydrate and ammonium fluoride that the total mass of 1Kg is 1:3 into the reactor, the reactor is a cylindrical container made of stainless steel, and the ratio of the height of the container to the diameter The ratio of the volume of the container to the sum of the mass of bismuth nitrate pentahydrate and ammonium fluoride is 2:1. Five circular fluid inlets are arranged on the top of the container, and their centers are respectively distributed at the center of the circular top of the container and the midpoints of four radii that form an angle of 90° with each other, and its diameter is 18% of the container diameter. After the mixture of bismuth nitrate pentahydrate and ammonium fluoride is put into the reactor, vibrate the reactor up and down, the amplitude of the vibration is 5 cm, and the frequency is 1 time / second; the vibration stops after 10 seconds from all the fluid inlets on the top of the container. The same flow rate is...

Embodiment 2

[0014]Embodiment 2: Put bismuth nitrate pentahydrate and ammonium fluoride that the total mass is 2Kg into a reactor with a mass ratio of 1: 3. The reactor is a cylindrical container made of stainless steel, and the ratio of the height to the diameter of the container is The ratio of the volume of the container to the sum of the mass of bismuth nitrate pentahydrate and ammonium fluoride is 3L / Kg. 5 circular fluid inlets are arranged on the top of the container, and their centers are respectively distributed at the center of the circular top of the container and the midpoints of four radii that form an angle of 90° with each other, and its diameter is 19% of the container diameter. After the mixture of bismuth nitrate pentahydrate and ammonium fluoride is put into the reactor, vibrate the reactor up and down, the amplitude of the vibration is 7 cm, and the frequency is 2 times / second; the vibration stops after 12 seconds from all fluid inlets on the top of the container. The sa...

Embodiment 3

[0015] Embodiment 3: put bismuth nitrate pentahydrate and ammonium fluoride that the total mass is 3Kg into the reactor with the molar ratio of 1: 3, the reactor is a cylindrical container made of stainless steel, and the ratio of the height of the container to the diameter The ratio of the volume of the container to the sum of the mass of bismuth nitrate pentahydrate and ammonium fluoride is 5L / Kg. 5 circular fluid inlets are arranged on the top of the container, and their centers are respectively distributed at the center of the circular top of the container and the midpoints of four radii that form an angle of 90° with each other, and its diameter is 20% of the container diameter. After the mixture of bismuth nitrate pentahydrate and ammonium fluoride is put into the reactor, vibrate the reactor up and down, the amplitude of the vibration is 10 cm, and the frequency is 3 times / second; the vibration stops after 15 seconds from all fluid inlets on the top of the container. Th...

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Abstract

The invention relates to a non-acid system liquid phase synthesized C / Bi / BiF3 composite bismuth fluoride lithium ion battery positive electrode material and a preparation method thereof. According to the method, the addition of dilute nitric acid for suppressing hydrolysis is omitted by designing a mixing mode of raw materials of bismuth nitrate pentahydrate and ammonium fluoride and an addition mode and addition rate of water, and a risk that high-toxicity hydrogen fluoride is generated by an effect of the dilute nitric acid and the ammonia fluoride is prevented; moreover, a certain amount of high-conductivity carbon and metal bismuth are reduced on surfaces of bismuth fluoride particles in an in-situ way, metal bismuth provides a homogeneous crystal core for an electrode material during discharging, and dynamics blocking formed by a new phase is reduced; and during the reaction process, side-reaction products such as various compound salts of the bismuth fluoride in liquid phase reaction are prevented, and the material has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing a high-performance 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 autom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/582H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 水淼
Owner 宁波吉电鑫新材料科技有限公司
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