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Carbon-coated transition metal oxide or transition metal nanoparticle composite electrode material adopting cellular structure and preparation method thereof

A transition metal, microporous structure technology, applied in battery electrodes, structural parts, circuits, etc., to achieve the effect of reducing volume change, shortening diffusion distance, and easy operation

Inactive Publication Date: 2014-10-01
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the efficient and large-scale synthesis of uniform microporous carbon-coated transition metal oxide composite electrode materials through simple methods, so that it can effectively improve the performance of lithium batteries.

Method used

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  • Carbon-coated transition metal oxide or transition metal nanoparticle composite electrode material adopting cellular structure and preparation method thereof
  • Carbon-coated transition metal oxide or transition metal nanoparticle composite electrode material adopting cellular structure and preparation method thereof
  • Carbon-coated transition metal oxide or transition metal nanoparticle composite electrode material adopting cellular structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation process of the carbon-coated transition metal oxide nanoparticle composite electrode material with microporous structure is as follows,

[0036] Specifically in two steps: 1. Synthesis of tin alginate:

[0037] Add 20 g of sodium alginate into 500 mL of deionized water, and heat and stir at 65° C. for 6 hours to completely dissolve it. Afterwards, 30 grams of tin dichloride was added to 400 mL of deionized water, 2 mL of hydrochloric acid solution (1M) was added, and stirred for 20 minutes to completely dissolve it. Then the two solutions are fully mixed for 2 hours to obtain tin alginate precipitation; after centrifugation and washing, dry at 60°C for 20 hours to obtain the tin alginate precursor;

[0038] 2. Microporous SnO 2 Synthesis of C

[0039] The tin alginate precursor prepared in step 1 was placed in a muffle furnace at 500°C and annealed for 6 hours under the protection of an inert gas to transform tin alginate into SnO with a microporous s...

Embodiment 2

[0042] The preparation process of the carbon-coated transition metal oxide nanoparticle composite electrode material with microporous structure is as follows,

[0043] Specifically in two steps: 1. the synthesis of ferrous alginate:

[0044] Add 5 g of sodium alginate into 500 mL of deionized water, and heat and stir at 90° C. for 4 hours to completely dissolve it. Afterwards, 20 grams of ferrous chloride was added into 400 mL of deionized water, and stirred for 30 minutes to completely dissolve it. Then the two solutions are fully mixed for 2 hours to obtain ferrous alginate precipitate; after centrifugation and washing, dry at 100°C for 10 hours to obtain the ferrous alginate precursor;

[0045] 2. Microporous Fe 2 o 3 Synthesis of C

[0046] Place the ferrous alginate precursor prepared in step 1 in a muffle furnace at 800°C, and anneal for 4 hours under the protection of an inert gas to transform the ferrous alginate into Fe with a microporous structure. 2 o 3 C comp...

Embodiment 3

[0048] The preparation process of microporous carbon-coated transition metal oxide nanoparticles composite electrode material is as follows, specifically divided into two parts:

[0049] Step: 1. Synthesis of cobalt alginate:

[0050] Add 30 g of sodium alginate into 500 mL of deionized water, and heat and stir at 60° C. for 12 hours to completely dissolve it. Afterwards, 30 grams of cobalt sulfate was added into 400 mL of deionized water, and stirred for 20 minutes to completely dissolve it. Then, the two solutions are fully mixed for 1 hour to obtain cobalt alginate precipitate; after centrifugation and washing, dry at 80°C for 15 hours to obtain the cobalt alginate precursor;

[0051] 2. Microporous Co 3 o 4 Synthesis of C

[0052] The cobalt alginate precursor prepared in step 1 was placed in a muffle furnace at 500°C under the protection of an inert gas, and annealed for 6 hours to transform the cobalt alginate into a Co with a microporous structure. 3 o 4 Ccomposit...

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Abstract

The invention discloses a carbon-coated transition metal oxide or transition metal nanoparticle (MxOy@C or M@C) composite electrode material adopting a cellular structure and a preparation method thereof, and belongs to the technical field of lithium battery preparation. Alga acid radicals and transition metal ions have a coordination reaction to produce a transition metal alginate precursor, and the precursor is burnt through control on the heating temperature under the shielding of an inert gas to obtain the MxOy@C or M@C composite electrode material adopting the cellular structure. The prepared composite electrode material has the advantages that the composite electrode material is low in preparation cost, high in specific capacity, good in circling stability, not easy to decompose and the like. For example, the specific capacities of the composite material are 500.5 mAhg-1, 478.4 mAhg-1 and 321 mAhg-1 respectively after the composite material undergoes 50 cycles under charging and discharging conditions of 100 mA, 500 mA and 1000 mA respectively.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, in particular to a carbon-coated transition metal oxide and transition metal nanoparticles (M x o y C or MC) composite electrode material and preparation method thereof. Background technique [0002] Due to the advantages of small size, large capacity, low cost and environmental friendliness, lithium-ion batteries have broad application prospects in the fields of national defense, aerospace, communications, portable electronic products and electric vehicles, and have been widely concerned by people. [0003] Electrode materials are the core components of lithium-ion batteries and play a decisive role in the overall performance of the battery. Therefore, optimizing the structure of electrode materials and improving their electrochemical properties such as specific capacity and cycle stability are important research directions in the field of lithium batteries at present. Met...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391
CPCY02E60/122H01M4/366H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 王宇陈天瑞王雪思程桂青
Owner JILIN UNIV
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