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Lithium manganese silicate material for positive electrode material of lithium ion battery and preparation method thereof

A lithium ion battery, lithium manganese silicate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low energy density of lithium ion batteries, can not meet the requirements of electric vehicles, etc., and improve the low-voltage discharge cycle performance. , excellent electrochemical performance, the effect of improving theoretical capacity

Active Publication Date: 2020-06-23
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a lithium manganese silicate material used for the positive electrode material of lithium ion batteries and a preparation method thereof. The lithium manganese silicate material used for the positive electrode material of lithium ion batteries is The material and preparation method should solve the technical problem that the energy density of the lithium-ion battery in the prior art is low and cannot meet the requirements of the electric vehicle industry

Method used

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  • Lithium manganese silicate material for positive electrode material of lithium ion battery and preparation method thereof
  • Lithium manganese silicate material for positive electrode material of lithium ion battery and preparation method thereof
  • Lithium manganese silicate material for positive electrode material of lithium ion battery and preparation method thereof

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preparation example Construction

[0025] Battery preparation and electrochemical performance testing methods:

[0026] (1) Preparation of battery cathode sheet:

[0027] Mix the obtained lithium ion positive electrode material lithium manganese silicate, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) according to the mass ratio of 8:1:1, add an appropriate amount of solvent NMP, and fully stir to form a viscous slurry The material was uniformly coated on the surface of aluminum foil, dried in a blast and then dried in a vacuum oven at 120°C for 8 hours, and the positive electrode sheet was obtained after rolling for many times.

[0028] (2) Battery assembly and performance testing:

[0029] The electrochemical performance of the lithium manganese silicate cathode material was evaluated using a 2016-type half-cell. Punch the rolled battery pole piece into a disc with a diameter of 12mm. After accurately weighing its mass, calculate the mass of lithium manganese silicate in the pol...

Embodiment 1

[0032] A preparation method of lithium manganese silicate lithium ion battery nano cathode material, specifically comprising the following steps:

[0033] (1) First put Li 2 CO 3 , MnO , SiO 2 40.7 parts by mass, 71 parts by mass, and 60 parts by mass, and then add 550 parts by mass of deionized water to mix the above three raw materials, and form a slurry after stirring for a period of time.

[0034] (2) Put the slurry obtained in step (1) into a nano-scale ball mill, control the grinding speed at 2000r / min, grind for 4 hours, and obtain the size D of suspended particles 50 It is a slurry of about 200nm.

[0035] (3) The ball milling product obtained in step (2) was spray-dried at 180° C. to obtain spherical precursor powder of lithium manganese silicate.

[0036] (4) Press the precursor powder obtained in step (3) into briquettes with a pressure of 8 MPa using a tablet press.

[0037] (5) Put the block obtained in step (4) into a tube furnace for calcination, feed 90ml / ...

Embodiment 2

[0041] A preparation method of lithium manganese silicate lithium ion battery nano cathode material, specifically comprising the following steps:

[0042] (1) First put Li 2 CO 3 , MnO , SiO 2 According to the batching of 40.7 parts by mass, 71 parts by mass and 60 parts by mass, then add 550 parts by mass of deionized water to mix the above three raw materials, and form a slurry after stirring for a period of time.

[0043] (2) Put the slurry obtained in step (1) into a nano-scale ball mill, control the grinding speed at 2000r / min, grind for 3 hours, and obtain the size D of suspended particles 50 It is a slurry of about 250nm.

[0044] (3) The ball milling product obtained in step (2) was spray-dried at 180° C. to obtain spherical precursor powder of lithium manganese silicate.

[0045] (4) Press the precursor powder obtained in step (3) into briquettes with a pressure of 8 MPa using a tablet press.

[0046] (5) Put the block obtained in step (4) into a tube furnace for...

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Abstract

The invention relates to a lithium manganese silicate material for a lithium ion battery positive electrode material. The molecular formula of the lithium manganese silicate material is LiMnSiO4, the lithium manganese silicate material belongs to a cubic system, the space group is Fd-3m, a three-dimensional structural passage exists, the cell parameter a is equal to 8.16A-bar<3>, the cell volume V is equal to 543.3 A-bar<3>, and Mn is maintained with +3 valence. A preparation method of lithium manganese silicate is also provided. The preparation method comprises the steps of preparing Li2CO3, MnO and SiO2 according to a proportion, sequentially adding the mixture to deionized water for uniform mixing, pouring the mixture to a nanometer sand mill for grinding to obtain paste with the grain size of a suspension substance being 200-300 nanometers, spraying and drying the paste to obtain lithium manganese silicate precursor powder, pressing the precursor powder to form blocks, placing the blocks in a tubular furnace with an oxygen atmosphere for calcination, and taking out and smashing the block material to appropriate sizes, thereby obtaining the lithium manganese silicate nanometer battery positive electrode material. The lithium manganese silicate material prepared according to the method is excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a lithium ion battery, in particular to a lithium manganese silicate material used as a positive electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Since SONY first launched lithium-ion battery products on the market in 1990, it quickly caused an upsurge in exploring lithium-ion secondary batteries. In the current market, lithium-ion batteries have been widely used in our various fields, such as: mobile communication phones, notebook computers, power vehicles and other fields, and may even continue to deepen in military aerospace and other fields in the future. Lithium manganate (LiMn 2 o 4 ) material, as a cathode material for lithium-ion batteries, is recognized as one of the cathode materials for lithium-ion batteries with great application value because of its rich source of raw materials, low price, non-toxicity, enviro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/58H01M10/0525
CPCH01M4/485H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor 常程康呂庭键章冬云关利肖鹏肖英俊董键朱辉
Owner SHANGHAI INST OF TECH
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