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Hollow spherical NiMn2O4 lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., to achieve the effects of simple process, excellent electrochemical cycle stability and rate performance, and shortened diffusion distance.

Active Publication Date: 2013-10-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of Hollow Spherical Spinel NiMn by Solid State Reaction Method 2 o 4 Lithium-ion battery anode materials have not been reported in the literature

Method used

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  • Hollow spherical NiMn2O4 lithium ion battery cathode material and preparation method thereof
  • Hollow spherical NiMn2O4 lithium ion battery cathode material and preparation method thereof
  • Hollow spherical NiMn2O4 lithium ion battery cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] 1.69 g MnSO 4 ·H 2 O and 7.9 g NH 4 HCO 3 were dissolved in 200 mL deionized water to obtain their respective solutions; to the stirring MnSO 4 Add 20 mL of absolute ethanol to the solution, and add the prepared NH 4 HCO 3solution, and reacted for 1 hour to obtain a white precipitate, which was washed with absolute ethanol and deionized water and centrifuged 3 times each to remove SO 4 2- ; place the resulting sample at 50 o Dry in C oven for 20 hours to obtain figure 2 The spherical MnCO shown 3 powder.

[0022] The above MnCO 3 The powder is placed in a muffle furnace, with 3 o C min -1 The rate of heating up to 400 o C and constant temperature for 5 hours, then naturally cooled to room temperature to obtain image 3 The black spherical MnO shown 2 powder.

[0023] Weigh 1 g of the above MnO 2 and 1.431 g Ni(Ac) 2 4H 2 O into a beaker, add 80 mL of absolute ethanol, at 50 o Heating, stirring and dispersing to dryness under C; Pour the obtained mix...

Embodiment 2

[0026] 1.69 g MnSO 4 ·H 2 O and 15.8 g NH 4 HCO 3 were dissolved in 500 mL deionized water to obtain their respective solutions; to the stirring MnSO 4 Add 50 mL of absolute ethanol to the solution, and add the prepared NH 4 HCO 3 solution, reacted for 2 hours to obtain a white precipitate, washed with absolute ethanol and deionized water and centrifuged 3 times each to remove SO 4 2- ; Place the resulting sample at 60 o Dry in a C oven for 15 hours to obtain spherical MnCO 3 powder.

[0027] The above MnCO 3 The powder is placed in a muffle furnace, with 5 o C min -1 The rate of heating up to 400 o C and constant temperature for 8 hours, then naturally cooled to room temperature to obtain black spherical MnO 2 powder.

[0028] Weigh 1 g of the above MnO 2 and 1.431 g Ni(Ac) 2 4H 2 O into a beaker, add 80 mL of absolute ethanol, at 50 o Heating, stirring and dispersing to dryness under C; Pour the obtained mixture into an agate mortar and grind for 30 minutes...

Embodiment example 3

[0030] 1.69 g MnSO 4 ·H 2 O and 11.85 g NH 4 HCO 3 were dissolved in 300 mL deionized water to obtain their respective solutions; to the stirring MnSO 4 Add 60 mL of absolute ethanol to the solution, and at the same time add the prepared NH 4 HCO 3 solution, reacted for 3 hours to obtain a white precipitate, washed with absolute ethanol and deionized water and centrifuged 3 times each to remove SO 4 2- ; place the resulting sample at 80 o Dry in a C oven for 10 hours to obtain spherical MnCO 3 powder.

[0031] The above MnCO 3 The powder is placed in a muffle furnace, with 1 o C min -1 The rate of heating up to 450 o C and constant temperature for 10 hours, then naturally cooled to room temperature to obtain black spherical MnO 2 powder.

[0032] Weigh 1 g of the above MnO 2 and 1.672 g Ni(NO 3 ) 2 ·6H 2 O into a beaker, add 80 mL of absolute ethanol, at 50 o Heating, stirring and dispersing to dryness under C; pour the obtained mixture into an agate mortar ...

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Abstract

The invention discloses a hollow spherical NiMn2O4 lithium ion battery cathode material and a preparation method thereof, and belongs to the field of lithium ion battery electrode material technology. Particle size of the hollow spherical material is 1 to 3 micrometers; the spherical shell is made of NiMn2O4 nanometer crystals, and has a porous structure. The porous spherical shell is in favor of penetration of electrolyte, is capable of shortening diffusion distance of lithium ions, and possesses excellent electrochemistry cycling stability and rate capability. The preparation method is based on ''Kirkendall effect'', and the hollow spherical NiMn2O4 can be obtained directly by performing high temperature solid phase reaction. The preparation method comprises following steps: taking solid spherical MnCO3 as a precursor; roasting at a low temperature to obtain porous solid spherical manganese dioxide; and then roasting the porous solid spherical manganese dioxide with a nickel salt to obtain the hollow spherical spinel-type NiMn2O4 cathode material. The preparation method is simple in technologies, do not need a template, and is suitable for large-scaled production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials and their preparation, in particular to a hollow spherical NiMn 2 o 4 Lithium-ion battery negative electrode material and preparation method. Background technique [0002] Metal oxide lithium-ion battery anode materials have the advantages of high mass specific capacity and volume specific capacity, and have received extensive attention in recent years. Among them, spinel NiMn 2 o 4 It has relatively low raw material cost and high theoretical specific capacity, and is a lithium-ion battery negative electrode material with good development potential. In the literature (1) Journal of Materials Chemistry, 2011, 21: 10206-10218, Fabrice M. Courtel et al prepared nano-spinel NiMn by co-precipitation method 2 o 4 , and studied its electrochemical performance as an anode material for lithium-ion batteries. Although the material has a high initial specific capacity, ...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/50H01M4/1391B82Y40/00
CPCY02E60/10
Inventor 杨文胜冯玉龙
Owner BEIJING UNIV OF CHEM TECH
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