A kind of preparation method of lithium manganese borate lithium ion battery cathode material

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, borate, circuits, etc., and can solve the problems of long experimental period of sol-gel method and hydrothermal method, difficult electronic and ionic conductivity, and noise of mechanical ball milling. Large problems such as high initial reversible charge-discharge specific capacity, high reproducibility, and high charge-discharge specific capacity are achieved.

Active Publication Date: 2016-03-02
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The mechanical ball milling method is noisy, the purity of the obtained material is not high, the particles are large and uneven, and the crystallinity is low. This method is difficult to improve the overall electrochemical performance of the material by improving the defects such as low electronic and ionic conductivity of the material itself.
[0007] The sol-gel method and the hydrothermal method have a long experimental cycle, poor reproducibility, difficult conditions to control, and harsh raw material selection, which seriously restrict their use and promotion.

Method used

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  • A kind of preparation method of lithium manganese borate lithium ion battery cathode material
  • A kind of preparation method of lithium manganese borate lithium ion battery cathode material
  • A kind of preparation method of lithium manganese borate lithium ion battery cathode material

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Embodiment 1

[0028] Take 4.99g of lithium metaborate, 0.20g of lithium acetate, 17.31g of manganese acetate, and 3.60g of glucose, dissolve them in 150ml of deionized water, and stir them magnetically in a beaker for 5 hours to obtain a gel-like mixture; On the freezer shelf, put them together into the cold trap for pre-freezing for 5 hours. The pre-freezing temperature is set at -50°C. Put it above the cold trap, cover it with a plexiglass cover, and the lower end of the cover is in full contact with the "O"-shaped sealing ring. Set the temperature in the cold trap to -50°C, start the vacuum pump, and set the vacuum degree to below 15Pa. After drying for 24 hours, open it. Inflate the vacuum valve, stop the work of the vacuum pump and compressor in turn, and obtain the precursor; raise the temperature of the obtained precursor to 400°C at a rate of 5°C per minute under the protection of argon with a purity of 99.999%, keep the temperature for 5 hours, and then increase the temperature at a...

Embodiment 2

[0033] Take 4.99g of lithium metaborate, 0.20g of lithium acetate, 17.31g of manganese acetate, and 13.50g of glucose, dissolve them in 200ml of deionized water, and stir them magnetically in a beaker for 5 hours to obtain a gel-like mixture; Put them together on the freezer shelf into the cold trap for 7h pre-freezing. The pre-freezing temperature is set at -30°C. Put it on the top of the cold trap, cover it with a plexiglass cover, and the lower end of the cover is in full contact with the "O"-shaped sealing ring. Set the temperature in the cold trap to -40°C, start the vacuum pump, and set the vacuum degree below 15Pa. After drying for 23 hours, open it. Inflate the vacuum valve, stop the work of the vacuum pump and compressor in turn to obtain the precursor; under the protection of argon gas with a purity of 99.999%, the temperature of the obtained precursor is raised to 400°C at a rate of 5°C per minute, and the temperature is kept constant for 5h. Raise the temperature t...

Embodiment 3

[0036] Take 4.99g of lithium metaborate, 0.20g of lithium acetate, 17.31g of manganese acetate, and 13.50g of glucose, dissolve them in 200ml of deionized water, and stir them magnetically in a beaker for 5 hours to obtain a gel-like mixture; On the freezing rack, put them together into the cold trap for pre-freezing for 6 hours. The pre-freezing temperature is set at -40°C. Put it above the cold trap, cover it with a plexiglass cover, and the lower end of the cover is in full contact with the "O"-shaped sealing ring. Set the temperature in the cold trap to -30°C, start the vacuum pump, and set the vacuum degree to below 15Pa. After drying for 24 hours, open it. After the vacuum valve is inflated, stop the work of the vacuum pump and compressor in turn to obtain the precursor; under the protection of argon gas with a purity of 99.999%, the temperature of the obtained precursor is raised to 400 °C at a rate of 5 °C per minute, and the temperature is maintained for 5 hours. Rais...

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Abstract

The invention discloses a preparation method of anode material manganese-lithium borate for a lithium ion battery, which comprises the following steps: (1) dissolving lithium metaborate, lithium acetate, manganese acetate and glucose in deionized water and stirring uniformly; (2) putting into a cold trap for pre-freezing, taking out after the pre-freezing is ended, putting into a drying frame, placing the drying frame above the cold trap, setting the temperature in the cold trap to be -50 DEG C to -20 DEG C, starting a vacuum pump, setting the vacuum degree to be below 15Pa and drying for 20-24 hours; and (3) heating to the temperature of 350 DEG C to 450 DEG C at a speed of 1-5 DEG C per minute under the protection of argon, stabilizing the temperature for 4-6 hours, then heating to the temperature of 600 DEG C to 700 DEG C at the speed of 1-5 DEG C per minute, stabilizing the temperature for 4-6 hours, introducing the argon and naturally cooling to room temperature to obtain the anode material manganese-lithium borate. By adopting the preparation method disclosed by the invention, the operation is simple, the reproducibility is good, a precursor material is small in particle size, the particle size of a material obtained through sintering can be well controlled, a good carbon coating effect is achieved, a good electron conduction performance is realized, and the charge-discharge specific capacity for the first time is high.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of freeze-drying-solid-state sintering of lithium manganese borate, a positive electrode material of a lithium ion battery. Background technique [0002] With the increasingly prominent energy and environmental issues and the rapid development of modern technology, people have put forward higher requirements for battery performance. Due to the advantages of high working voltage, high energy density, long cycle life and low self-discharge, lithium-ion batteries are widely used in portable electronic devices, power tools, space technology, and defense industries. In recent years, the development and application of a new generation of electronic products and electric vehicles has put forward higher requirements for the energy density and power density of the secondary power supply system, and the design and prepara...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B35/12
CPCY02E60/10
Inventor 张宝覃山鄂郑俊超明磊欧星张佳峰
Owner CENT SOUTH UNIV
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