Porous metallic cathode material doped with lithium manganate/carbon for composite lithium batteries, and preparation method of porous metallic cathode material

A technology of heteromanganate lithium and porous metal, which is applied in the field of preparation of new porous metal-doped lithium manganate/carbon composite lithium battery cathode materials, can solve the problems that the sintering temperature cannot be too high and the grain crystallinity is not ideal. Achieve good discharge specific capacity, good crystallinity, and uniform particle size

Inactive Publication Date: 2015-07-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the template method is used, the material with the required structure can be obtained, but in order to prevent the collapse of the porous structure, the sintering temperature should not be too high, so that the grain crystallinity is not ideal

Method used

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  • Porous metallic cathode material doped with lithium manganate/carbon for composite lithium batteries, and preparation method of porous metallic cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In the first step, the polymer p123 with a molar mass of 5800 was dissolved in an appropriate amount of absolute ethanol, and stirred continuously at room temperature to obtain 20 mL of P123 gel with a uniform dispersion concentration of 0.05 g / mL.

[0025] In the second step, solid Mn(NO 3 ) 2 4H 2 O, LiNO 3 , Fe(NO 3 ) 3 9H 2 O is added in a molar ratio of 9:5:1, LiNO 3 The amount is 0.05mol.

[0026] In the third step, the above mixture was magnetically stirred at a medium speed for 12 h at room temperature.

[0027] In the fourth step, the uniformly mixed sol is air-dried at 60° C. for 24 hours in an air-blast drying oven.

[0028] In the fifth step, the dried mixture is heated in a muffle furnace at 2° C. / min to 500° C. in an air atmosphere, and kept for 2 hours.

[0029] In the sixth step, the prepared sample was uniformly dispersed in a mixed solution of 1.2 g of anhydrous glucose dissolved in 5 mL of deionized water and 15 mL of absolute ethanol, magnet...

Embodiment 2

[0034] In the first step, the polymer p123 with a molar mass of 5800 was dissolved in an appropriate amount of absolute ethanol, and stirred continuously at room temperature to obtain 20 mL of P123 gel with a uniform dispersion concentration of 0.08 g / mL.

[0035] In the second step, solid Mn(NO 3 ) 2 4H 2 O, LiNO 3 , Fe(NO 3 ) 3 9H 2 O is added in a molar ratio of 9:5:1, LiNO 3 The amount is 0.1mol.

[0036] In the third step, the above mixture was magnetically stirred at a medium speed for 16 h at room temperature.

[0037] In the fourth step, the uniformly mixed sol was air-dried at 70° C. for 36 hours in an air-blast drying oven.

[0038] In the fifth step, the dried mixture is heated in a muffle furnace at 3° C. / min to 600° C. in an air atmosphere, and kept for 3 hours.

[0039] In the sixth step, the prepared sample was uniformly dispersed in a mixed solution of 1.4 g of anhydrous glucose dissolved in 5 mL of deionized water and 15 mL of absolute ethanol, magnet...

Embodiment 3

[0044] In the first step, the polymer p123 with a molar mass of 5800 was dissolved in an appropriate amount of absolute ethanol, and stirred continuously at room temperature to obtain 20 mL of P123 gel with a uniform dispersion concentration of 0.1 g / mL.

[0045] In the second step, solid Mn(NO 3 ) 2 4H 2 O, LiNO 3 , Fe(NO 3 ) 3 9H 2 O is added in a molar ratio of 9:5:1, LiNO 3 The amount is 0.5mol.

[0046] In the third step, the above mixture was magnetically stirred at a medium speed for 24 h at room temperature.

[0047] In the fourth step, the uniformly mixed sol is air-dried at 80° C. for 48 hours in an air-blast drying oven.

[0048] In the fifth step, the dried mixture is heated up to 700° C. in a muffle furnace at 5° C. / min in an air atmosphere, and kept for 4 hours.

[0049] In the sixth step, the prepared sample was uniformly dispersed in a mixed solution of 1.6 g of anhydrous glucose dissolved in 5 mL of deionized water and 15 mL of absolute ethanol, magne...

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Abstract

The invention relates to a porous metallic cathode material doped with lithium manganate/carbon for composite lithium batteries, and a preparation method of the porous metallic cathodmaterial. The preparation method comprises the following steps: dissolving a surfactant in absolute ethyl alcohol, and stirring the surfactant and the absolute ethyl alcohol so as to obtain gel; adding lithium nitrate, and nitrate mixed with metal nitrate and manganese in the obtained gel, and performing uniform stir; after uniformly mixing, drying the mixture in a blast drying box, and further calcining the dried mixture in a muffle furnace so as to obtain the porous material doped with lithium manganate LiM0.2Mn1.8O4; dissolving the LiM0.2Mn1.8O4 in glucose solution, enabling the LiM0.2Mn1.8O4 to uniformly disperse, and after performing air blast drying, calcining the dried product in nitrogen atmosphere so as to obtain the metallic composite material LiM0.2Mn1.8O4/C doped with lithium manganate/carbon, wherein M refers to the doped metal. Compared with the prior art, the porous metallic cathode material prepared through the preparation method disclosed by the invention has the advantages that the crystallizing property is good, the particle size is about 20nm, and the material has good specific discharge capacity, rate capability and cycling properties as the cathode material for lithium batteries. The preparation idea of the preparation method disclosed by the invention can be applied to the preparation of other cathode materials of composite materials of porous metallic oxides.

Description

technical field [0001] The invention relates to a preparation method of a novel porous metal-doped lithium manganese oxide / carbon composite lithium battery cathode material, specifically porous LiM 0.2 mn 1.8 o 4 / C preparation method. Background technique [0002] LiMn 2 o 4 During the charging and discharging process, the dissolution of Mn and the Jahn-Teller effect will occur, which will cause the deformation of the crystal lattice and the instability of the lattice structure, resulting in the loss of the electroactive part and the decrease of the specific capacity, especially at high temperature (>55 ° C) cycle performance poor. Studies have found that LiMn can be replaced by transition elements such as Mg, Al, Zn, Ti, Cr, Fe, Co, Ni, Cu, etc. 2 o 4 The middle part of Mn is to strengthen the crystal field effect of atoms in the crystal, inhibit the atomic migration and structural phase transition that are not conducive to the delithiation process during the ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/139H01M4/362H01M4/505H01M4/525H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 朱申敏石一杉朱呈岭李尧张荻
Owner SHANGHAI JIAO TONG UNIV
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