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Continuous conductive liquid phase synthesized C/Cu/CuF2 composite copper fluoride lithium ion battery positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of high-performance copper fluoride composite lithium battery positive electrode materials, can solve the problems of high polarization voltage, unfavorable, low electronic conductivity, etc. The effect of improving electronic conductivity

Inactive Publication Date: 2017-07-21
宁波吉电鑫新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still very few reports on copper fluoride materials as cathode materials for lithium-ion batteries. The main difficulty is that the electrochemical properties of copper fluoride are closely related to the preparation process and have poor repeatability; at the same time, copper fluoride materials in organic electrolytes The medium stability is not enough; it also has a negative characteristic that the electronic conductivity is extremely low, so it will lead to a high polarization voltage during the charge and discharge process, although some researchers use carbon black mixed ball milling to improve the conductivity of the material However, 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 metallic copper and lithium fluoride during discharge, and the small particles of the new phase are kinetically disadvantaged in the initial formation stage, so the maintenance of the subsequent charge-discharge capacity, discharge potential, and charge-discharge capacity ability to adversely affect

Method used

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  • Continuous conductive liquid phase synthesized C/Cu/CuF2 composite copper fluoride lithium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013]Embodiment 1: Put copper sulfate pentahydrate and ammonium fluoride that the total mass is 1Kg into a reactor with a mass ratio of 1:2. The reactor is a cylindrical vessel made of stainless steel. The ratio of the volume of the container to the sum of the mass of copper sulfate pentahydrate and ammonium fluoride is 2L / Kg. 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 copper sulfate 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; stop the vibration after 10 seconds of vibration from all fluid inlets on the top of the container. The same flow rate is simultaneously fed into an aqueous soluti...

Embodiment 2

[0014] Embodiment 2: Put copper sulfate pentahydrate and ammonium fluoride that the total mass is 2Kg into a reactor with a mass ratio of 1:2. 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 copper sulfate 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 copper sulfate 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; stop the vibration after 12 seconds from all fluid inlets on the top of the container. The same flow...

Embodiment 3

[0015] Embodiment 3: Put copper sulfate pentahydrate and ammonium fluoride with a total mass of 3Kg in a reactor with a mass ratio of 1:2. 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 copper sulfate 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 copper sulfate pentahydrate and ammonium fluoride is put into the reactor, vibrate the reactor up and down, the amplitude of vibration is 10 cm, and the frequency is 3 times / second; after 15 seconds of vibration, stop the vibration from all fluid inlets on the top of the container. The sa...

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Abstract

The invention relates to a continuous conductive liquid phase synthesized C / Cu / CuF2 composite copper fluoride lithium ion battery positive electrode material and a preparation method thereof. According to the method, side-reaction products such as various compound salts of copper fluoride in liquid phase reaction are prevented by designing a mixing mode of raw materials of copper sulfate pentahydrate and ammonium fluoride and an addition mode and addition rate of water; meanwhile, a high-conductivity continuous carbon film with a hole and gap structure is formed by the drying process under a low-temperature and high-vacuum condition and the subsequent thermal treatment process, and the electron conductivity of a composite material is substantially improved; and moreover, a certain amount of copper is reduced on surface of copper fluoride particles in an in-situ way, a homogeneous crystal core is provided for an electrode material during discharging, dynamics blocking formed by a new phase is reduced, and the capacity of the material, the cycle capacity stability and a potential of a discharge platform are improved.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/38H01M4/582H01M4/625H01M10/0525Y02E60/10
Inventor 水淼
Owner 宁波吉电鑫新材料科技有限公司
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