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Lithium-rich manganese-based anode material and method for manufacturing same

A cathode material, lithium-rich manganese-based technology, applied in the field of new energy material preparation

Active Publication Date: 2015-05-13
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Patent [201010266916.3] discloses the preparation of Li[Li x Ni a mn b m 1-a-b-x ]O 2 It can be seen that there are different degrees of differences in the performance of lithium-rich manganese-based lithium-ion battery cathode materials prepared by different gel systems.

Method used

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  • Lithium-rich manganese-based anode material and method for manufacturing same
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  • Lithium-rich manganese-based anode material and method for manufacturing same

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preparation example Construction

[0117] A preferred preparation method comprises the steps of:

[0118] Uniformly mix the lithium-rich manganese-based cathode material with a conductive agent and a binder in a solution (such as nitrogen-methylpyrrolidone (NMP)), and adjust the appropriate mass ratio of the lithium-rich manganese-based cathode material, conductive agent and binder (such as 85:10:5), and then coated and pressed on aluminum foil, and dried in a vacuum to obtain a positive electrode sheet.

[0119] Lithium-ion secondary battery

[0120] The lithium ion secondary battery provided by the invention comprises positive electrode material, negative electrode material, separator, electrolyte and shell. Wherein, the positive electrode material comprises the lithium-rich manganese-based positive electrode material Li[Li[Li] of the present invention x Ni a mn b m 1-a-b-x ]O 2The negative electrode material is natural graphite, artificial graphite, mesocarbon microspheres, silicon carbide, alloy mater...

Embodiment 1

[0128] 1.1. Weigh Lithium Acetate, Nickel Acetate, Cobalt Acetate and Manganese Acetate according to the molar ratio of 1.2:0.13:0.13:0.54, add them into deionized water and control the temperature at 30°C under magnetic stirring to fully dissolve them ;

[0129] 1.2. Then add resorcinol 2 times the amount of total metal ions and CTAB 1 / 20 times the amount of total metal ions; add hydrochloric acid catalyst, adjust the pH to 3.0, and stir magnetically at 30°C to dissolve and mix evenly; add Formaldehyde, according to the mol ratio of formaldehyde and resorcinol is the ratio of 2:1 to measure the formaldehyde solution, magnetically stirred for 30 minutes;

[0130] 1.3. Transfer the mixed solution obtained in 1.2 into a constant temperature drying oven and react at 80°C for 24 hours to obtain a pre-condensed polymer, and vacuum-dry the pre-condensed polymer at 120°C to obtain Interpreted condensate; the precalcined condensate is pre-calcined at 400°C for 5 hours in air, then he...

Embodiment 2

[0132] 2.1. According to the molar ratio of 1.2:0.17:0.07:0.56, weigh lithium acetate, nickel acetate, cobalt acetate and manganese acetate and add them into deionized water, and control the temperature at 80°C under magnetic stirring to fully dissolve;

[0133] 2.2. Then add resorcinol 1.5 times the amount of total metal ions and CTAB 1 / 30 times the amount of total metal ions; add oxalic acid catalyst to adjust the pH to 4.5, then magnetic stirring at 80°C to dissolve and mix evenly; Add formaldehyde, measure the formaldehyde solution according to the molar ratio of formaldehyde and resorcinol is 2:1, add to the above solution, and stir magnetically for 30 minutes;

[0134] 2.3. Transfer the mixed solution obtained in 2.2 into a constant temperature drying oven and react at 90°C for 48 hours to obtain a pre-condensed polymer, and then dry the pre-condensed polymer in vacuum at 130°C to obtain a pre-condensed product. The intercondensate is pre-calcined at 400°C for 5h in air,...

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Abstract

The invention discloses a lithium-rich manganese-based anode material and a method for manufacturing the same. The method includes steps of (a), providing mixed solution containing lithium compounds, nickel compounds and manganese compounds, optional titanium compounds, optional iron compounds, optional cobalt compounds or an optional combination of the titanium compounds, the ion compounds and the cobalt compounds; (b), adding complexing agents, catalysts and surfactants into the mixed solution to form pre-coagulated substances; and (c), calcining the pre-coagulated substances to obtain the lithium-rich manganese-based anode material Li[LixNiaMnbM1-a-b-x]O2 or a combination of lithium-rich manganese-based anode materials. The complexing agents, the catalysts and the surfactants are used for forming the pre-coagulated substances, the complexing agents contain resorcinol and formaldehyde, in the molecular formula of the lithium-rich manganese-based anode material, the M represents Ti, Fe, Co or a combination of the Ti, the Fe and the Co, the x is larger than 0 and is smaller than or equal to 0.4, the a is larger than 0 and is smaller than or equal to 0.5, the b is larger than or equal to 0.33 and smaller than or equal to 0.6, and a result of 1-a-b-x is larger than or equal to 0. The lithium-rich manganese-based anode material is of a multi-channel porous structure, is small in grain size, uniform in grain distribution, advanced in porosity and stable in electrochemical performance.

Description

technical field [0001] The invention belongs to the field of preparation technology of new energy materials, in particular to a preparation method of a lithium-rich manganese-based positive electrode material for a lithium-ion battery, more precisely a lithium-rich manganese-based Li[Li x Ni a mn b m 1-a-b-x ]O 2 The method of preparation of the material. Background technique [0002] Among metal oxide lithium-ion battery materials, LiCoO 2 Although it is one of the most mature materials for commercialization, it has problems such as poor safety, poor overcharge resistance, high cost, and environmental pollution; and LiNiO 2 It also has poor stability, which is likely to cause safety problems, and needs to be synthesized under an oxygen atmosphere. During the synthesis process, cation mixing and non-stoichiometric structural compounds are prone to occur. [0003] Manganese LiMnO 2 Although the positive electrode material is cheap, rich in resources, and high in theore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/131H01M10/0525
CPCY02E60/10
Inventor 何金铧张贤惠黎军王德宇毕玉敬
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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