Preparation method of lithium manganate precursor for lithium ion battery anode material

A lithium-ion battery and cathode material technology, which is applied in battery electrodes, manganate/permanganate, circuits, etc., to achieve the effects of no three-waste emissions, improved electrochemical cycle performance, and short process flow

Inactive Publication Date: 2011-04-27
李运姣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above studies have improved the LiMn to a certain extent 2 o 4 charging and discharging performance, bu...

Method used

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  • Preparation method of lithium manganate precursor for lithium ion battery anode material
  • Preparation method of lithium manganate precursor for lithium ion battery anode material
  • Preparation method of lithium manganate precursor for lithium ion battery anode material

Examples

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Effect test

Embodiment 1

[0026] Example 1 : (1) 600g electrolytic MnO 2 , 179.3g LiOH·H 2 O and 480g deionized water are mixed with reactant slurry, add in the autoclave (Li / Mn mol ratio is 0.62, liquid-solid weight ratio H 2 O / MnO 20.8); (2) While stirring, heat up to 180°C, and stir for 3 hours at a constant temperature; (3) Filter the reaction product slurry obtained in step (2), and dry the solid phase product at 110°C for 12 hours, 655.2g of lithium manganate precursor was obtained, and its Li / Mn ratio satisfied the molecular formula Li 1.100 mn 2 o 4 ; The volume of the liquid phase mother liquor is 420 mL, containing Li 1.2mol / L, returning to prepare the next batch of reactant slurry. Gained lithium manganate precursor shows through XRD analysis, has amorphous structure (see attached figure 1 ), and its morphology under the electron microscope is shown in the appendix image 3 . The obtained lithium manganate precursor was heat-treated at 800° C. for 10 hours, ground and pulverized a...

Embodiment 2

[0027] Example 2 : (1) Get 200mL of the mother liquor gained in Example 1 (Li 1.2mol / L), add LiOH·H 2 O 18.8g, then add chemical MnO 2 200g, be mixed with reactant slurry, add in the reactor (Li / Mn molar ratio is 0.3, liquid-solid weight ratio H 2 O / MnO 2 1.0); (2) While stirring, raise the temperature to 200°C, stir and react at a constant temperature for 2.5 hours; (3) Dry the reaction product slurry obtained in step (2) at 120°C for 24 hours to obtain a lithium manganate precursor 213.8 g, whose Li / Mn ratio satisfies the molecular formula Li 0.605 mn 2 o 4 . XRD analysis shows that the lithium manganese oxide precursor has an amorphous structure. The lithium manganate precursor was heat-treated at 750° C. for 12 hours, ground and pulverized after cooling to obtain lithium manganate powder. XRD analysis shows that the phase structure of the powder is mainly spinel lithium manganese oxide, containing a small amount of MnO 2 . The results of chemical analysis show ...

Embodiment 3

[0028] Example 3 : (1) 200g electrolytic MnO 2 , a mixture of 4.6 mol of lithium acetate and lithium hydroxide and 600 g of deionized water to prepare a reaction slurry and add it to the reactor (Li / Mn molar ratio is 2.0, liquid-solid weight ratio H 2 O / MnO 2 3.0); (2) While stirring, the temperature was raised to 110°C, and the stirring was carried out at a constant temperature for 12 hours; (3) After the reaction product slurry obtained in step (2) was filtered to remove the mother liquor, it was dried at 105°C for 12 hours. hours, 225.6g of lithium manganate precursor was obtained, and its Li / Mn ratio satisfied the molecular formula Li 0.971 MnO 2 . The obtained lithium manganate precursor was placed in a high-temperature furnace, heat-treated at a constant temperature of 800° C. for 15 hours, ground and pulverized after cooling. It was proved by XRD detection that the obtained product was lithium manganese oxide with layered structure. Chemical analysis shows that i...

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Abstract

The invention relates to a preparation method of a lithium manganate precursor for a lithium ion battery anode material. The method comprises the following steps: (1) adding manganese dioxide and lithium compound in water according to Li-to-Mn molar ratio of 0.3-4.0 to prepare reaction material slurry; (2) putting the reaction material slurry prepared at the step (1) into a reactor, increasing the temperature to 80-300 DEG C while agitating, and agitating for constant temperature reaction for 0.2-16 hours; and (3) separating the liquid and the solid of the reaction product slurry obtained at the step (2) to obtain amorphous lithium manganate precursor. The invention has the advantages that (1) since the amorphous lithium manganate precursor is synthesized through the reaction between the manganese dioxide and the lithium compound in water solution, the composition and the grain size distribution of the obtained product are even, the shape is regular, the chemical activity is good, and the structure, the grain size and the shape of the material in the process of subsequent heat treatment can be easily and effectively controlled; (2) the used raw materials are cheap and can be obtained easily, the utilization ratio is high and the preparation cost is low; (3) waste water, waste gas and solid waste are not emitted during preparation and the environmental benefit is good; and (4) the method is simple, the process flow is short and the industrialization can be realized easily.

Description

technical field [0001] The invention relates to a preparation method of a lithium manganate precursor used in a positive electrode material of a lithium ion battery. Background technique [0002] With the shortage of petroleum resources and the aggravation of air pollution, the development of energy-saving and environment-friendly pure electric vehicles and hybrid vehicles has become a top priority for research in all countries in the world today. Lithium-ion battery is recognized as a green battery by the world because of its advantages of high working voltage, high specific energy, low self-discharge rate, long service life, no memory effect and no environmental pollution, and has become the main direction of electric vehicle battery development. At present, lithium-ion batteries for electric vehicles mainly use lithium manganese oxide or lithium iron phosphate as the positive electrode. Lithium manganese oxide has attracted people's attention because of its rich raw mate...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/131
CPCY02E60/122Y02E60/10
Inventor 李运姣
Owner 李运姣
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