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Method for preparing high-capacity long-life lithium ion battery lithium manganate cathode material

A technology for battery lithium manganate and positive electrode materials, which is applied in battery electrodes, chemical instruments and methods, manganate/permanganate, etc., and can solve the problems of limiting the utilization rate of positive electrode materials, poor high-temperature cycle performance, and low energy density, etc. problems, achieve the effects of reducing irreversible capacity loss, improving high-temperature performance reliably, and improving high-temperature performance significantly

Active Publication Date: 2014-03-26
哈尔滨博尔特能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings of the existing lithium manganate materials, such as low energy density and poor high-temperature cycle performance, seriously restrict its further development as a power battery.
[0004] The low energy density of lithium manganate is due to its low reversible specific capacity
Generally, when the battery is charged and discharged for the first time, a solid electrolyte interface (SEI) film will be formed on the negative electrode of the battery (metal lithium or graphite negative electrode, etc.). The formation process of this SEI film is irreversible and consumes part of the lithium source in the positive electrode material. The utilization rate of the positive electrode material is reduced, and the actual reversible specific capacity and cycle performance of the lithium-ion battery are reduced.

Method used

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  • Method for preparing high-capacity long-life lithium ion battery lithium manganate cathode material
  • Method for preparing high-capacity long-life lithium ion battery lithium manganate cathode material
  • Method for preparing high-capacity long-life lithium ion battery lithium manganate cathode material

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specific Embodiment approach 1

[0030] Specific implementation mode 1: In this implementation mode, the secondary doping active material calcined lithium manganate material is prepared according to the following steps:

[0031] Lithium carbonate and manganese sulfate were weighed according to the molar ratio Li:Mn=1.05:2, and mixed evenly in the mixed solution of deionized water and ethanol, and the temperature was raised from room temperature to 500°C at a heating rate of 5°C / min, and pre-calcined for 6 h , then raised to 900°C at the same heating rate, calcined for 16 h, classified to remove fine particles, and magnetically adsorbed metal ions to obtain lithium manganate;

[0032] The obtained lithium manganate is mixed into the above-mentioned lithium source at a rate of 0.025 (mass ratio of lithium) for the second time and mixed evenly;

[0033] The above mixture was put into an industrial kiln in an air atmosphere, and calcined at a temperature increase rate of 5 °C / min from room temperature to 700 °C f...

specific Embodiment approach 2

[0035] Specific implementation mode 2: In this implementation mode, the secondary doping active material calcined lithium manganate material is prepared according to the following steps:

[0036] Weigh lithium carbonate, manganese sulfate and titanium powder according to the molar ratio Li:Mn:M=1.05:1.95:0.05, and mix them uniformly in the mixed solution of deionized water and ethanol, and raise the temperature from room temperature to 500°C, pre-calcined for 6 hours, then raised to 900°C at the same heating rate, calcined for 16 hours, classified to remove fine particles, and magnetically adsorbed metal ions to obtain titanium-doped lithium manganate;

[0037] The obtained titanium-doped lithium manganese oxide is secondarily mixed with 0.02 (mass ratio of lithium) above lithium source and mixed evenly;

[0038] The above mixture was put into an industrial kiln in an air atmosphere, and calcined at a temperature increase rate of 5 °C / min from room temperature to 700 °C for 8 ...

specific Embodiment approach 3

[0040] Specific implementation mode three: In this implementation mode, the secondary doping active material calcined lithium manganate material is prepared according to the following steps:

[0041] Mole ratio Li:Mn:M 1 :M 2 =1.05:1.95:0.025:0.025 Weigh lithium carbonate, manganese sulfate, magnesium powder and aluminum powder, and mix them evenly in the mixed solution of deionized water and ethanol, and raise the temperature from room temperature to 500°C at a rate of 5°C / min. Pre-calcined for 6 hours, then raised to 1000°C at the same heating rate, calcined for 10 hours, classified to remove fine particles, and magnetically adsorbed metal ions to obtain magnesium-aluminum double-doped lithium manganate;

[0042] The obtained magnesium-aluminum double-doped lithium manganate is mixed into the above-mentioned lithium source at a rate of 0.03 (mass ratio of lithium) for a second time and mixed uniformly;

[0043]The above mixture was put into an industrial kiln in an air atm...

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Abstract

The invention relates to a method for preparing a high-capacity long-life lithium ion battery lithium manganate cathode material and belongs to the technical field of material synthesis. The method comprises the following steps: 1, weighing out one or more lithium sources, a manganese salt and one or more doped trace metal elements for uniformly mixing, preburning for 2-6 hours at 400-600 DEG C, calcining for 6-16 hours at 700-1000 DEG C, removing tiny particles in a grading mode, and magnetically adsorbing metal ions to obtain lithium manganate or primary doped lithium manganate; 2, secondarily doping the lithium sources into the lithium manganate or primary doped lithium manganate obtained by the step 1 for uniformly mixing; 3, calcining the mixture for 3-8 hours at 600-850 DEG C to obtain a primary or secondary doped calcined lithium manganate material. According to the method, as active materials are introduced for two times, the diffusion rate of Li+ is effectively increased, the irreversible capacity loss is reduced, the reversible specific capacity of the cathode material is increased, and the cycling stability of the cathode material is improved. The process is simple, the high-temperature performance is improved obviously and reliably, and the prepared lithium manganate material has high capacity and good high-temperature cycle performance.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a preparation method of a lithium-ion battery cathode material, in particular to a preparation method of a high-capacity, long-life lithium-ion battery cathode material. Background technique [0002] As another secondary battery after lead-acid batteries, nickel-cadmium batteries and nickel-hydrogen batteries, lithium-ion batteries have significant advantages such as no memory effect, high working voltage, and low self-discharge rate, and are ideal for solving contemporary energy and ecological environment issues. preferred technology. In recent years, lithium-ion batteries have been widely used in the field of high-energy batteries, and gradually expanded to the field of power batteries. [0003] In the composition of lithium-ion batteries, the cathode material determines the main performance of the battery. As one of the current commercial lithium-ion battery cathode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505C01G45/12
CPCY02E60/122C01G45/1257H01M4/505Y02E60/10
Inventor 王振波忤瑨玉富达刘宝生薛原张音
Owner 哈尔滨博尔特能源科技有限公司
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