High-temperature solid-phase preparation method of lithium ion battery negative electrode material

A lithium-ion battery, material lithium manganate technology, applied in the direction of battery electrodes, manganate/permanganate, secondary batteries, etc., can solve the problem of theoretical capacity limit development, etc., to achieve rich sources of raw materials, simple and easy process row, the effect of small grain size

Inactive Publication Date: 2014-07-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its high lithium intercalation potential and limited theoretical capacity limit its further development, and it is necessary to find a new generation of negative electrode materials.

Method used

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  • High-temperature solid-phase preparation method of lithium ion battery negative electrode material
  • High-temperature solid-phase preparation method of lithium ion battery negative electrode material
  • High-temperature solid-phase preparation method of lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Will Li 2 CO 3 and Mn(CH 3 COO) 2 Weigh according to the stoichiometric ratio of Li:Mn=2:1, mix evenly, use a planetary ball mill, add an appropriate amount of ethanol, just submerge the raw materials, use wet ball milling for 8 hours; then pre-heat at 300°C in an air atmosphere Processed for 5h, after natural cooling, a powdery product was obtained;

[0035] In the planetary ball mill, use the same method to ball mill again for 6 hours, dry it in an oven, manually grind it, press it into tablets, and sinter it at 750°C for 6 hours in an air atmosphere to obtain lithium manganate (Li 2 MnO 3 ) anode material.

[0036] The XRD pattern of the product is shown in figure 1 (a), as can be seen from the figure, using this high-temperature solid-state sintering method, a pure-phase monoclinic lithium manganese oxide (Li 2 MnO 3 ) anode material. There is no impurity peak in the spectrogram, and the product has high purity. When the charge and discharge voltage of the l...

Embodiment 2

[0039] LiCH 3 COO and MnCl 2 Weigh it according to the stoichiometric ratio of Li:Mn=2:1, put it into an agate mortar, and grind it manually for one hour;

[0040] Then under air atmosphere, pretreatment was carried out at 300°C for 12 hours, and after natural cooling, the powdery product was obtained

[0041] Put the above powdered product in a planetary ball mill, add ethanol that has just submerged the sample, use wet ball milling for 10 hours, dry it in an oven, manually grind it, and press it into tablets. 2 Under the atmosphere, sintering was carried out at 850°C for 6h to obtain lithium manganate (Li 2 MnO 3 ) anode material.

[0042] The XRD pattern of the product is shown in figure 1 (b), as can be seen from the figure, using this high-temperature solid-state sintering method, a pure-phase monoclinic lithium manganese oxide (Li 2 MnO 3 ) anode material. There is no impurity peak in the spectrogram, and the product has high purity. The lithium manganate (Li 2...

Embodiment 3

[0044] LiCO 3 and MnO 2 Take by weighing according to the stoichiometric ratio of Li:Mn=2:1, mix evenly, ball mill on a planetary ball mill for 12h, mix evenly;

[0045] Then under air atmosphere, pretreatment was carried out at 200°C for 8 hours, after natural cooling, the powdery product was obtained after grinding;

[0046] The above powder was sintered at 780° C. for 6 hours in an air atmosphere to obtain a lithium manganate negative electrode material.

[0047] Add acetylene black accounting for 10wt% of the mass fraction of the above-mentioned powdery product as a carbon source, ball mill again in a planetary ball mill for 10 h, and then anneal and sinter at 400 ° C for 6 h under N2 atmosphere to obtain carbon-coated lithium manganate ( Li 2 MnO 3 ) anode material.

[0048] The XRD pattern of the product is shown in Figure 7 (a), as can be seen from the figure, the pure phase monoclinic lithium manganese oxide (Li 2 MnO 3 ) negative electrode material, no impuri...

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Abstract

The invention discloses a high-temperature solid-phase preparation method of a lithium ion battery negative electrode material. The method comprises the following steps of uniformly mixing a manganese source and a lithium source according to a molar ratio of the manganese and lithium of 1:2, and ball milling the mixture for 6 to 25 hours to obtain a precursor; heating the uniformly mixed precursor at the temperature of 200 to 400 DEG C in an air atmosphere, naturally cooling the precursor, and grinding the precursor into a powder material; ball milling the obtained powder material, placing the powder into a tubular furnace, sintering the powder material at the temperature of 500 to 1000 DEG C in an air atmosphere or an inert gas atmosphere, and naturally cooling the powder material to obtain a lithium manganate negative material. The preparation method also comprises the steps of adding a carbon material to be ground, sintering the material at the temperature of 300 to 500 DEG C in an inert gas atmosphere to obtain the carbon-clad lithium ion battery negative electrode material lithium manganate. The preparation method is simple in process and easy in operation. Being used as a lithium ion battery negative material, the carbon-coated lithium manganate material synthesized through the method is excellent in performance, and the lithium intercalation potential is low (0.1V to 1V).

Description

technical field [0001] The invention relates to a high-temperature solid-phase preparation method of lithium manganate, a negative electrode material of a lithium ion battery. The lithium manganate negative electrode material synthesized by this method has excellent electrochemical performance and low lithium intercalation potential (0.1-1V), and is expected to become the negative electrode material of the next generation lithium ion battery. Background technique [0002] Due to the characteristics of high working voltage, high energy density, light weight, small size, small internal resistance, low self-discharge, long cycle life, no memory effect, and environmental friendliness, lithium-ion secondary batteries are widely used in communication power supplies, electric vehicles , Wind energy, solar energy, smart grid and other megawatt-level energy storage power stations have shown broad application prospects and huge economic benefits, and as lithium battery vehicles gradua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62C01G45/12
CPCY02E60/122C01G45/125H01M4/366H01M4/505H01M4/625H01M10/0525Y02E60/10
Inventor 赵彦明耿小凤董有忠
Owner SOUTH CHINA UNIV OF TECH
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