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Graphene aerogel loaded two-phase transition metal sulfide as well as preparation method and application thereof

A graphene aerogel, transition metal technology, applied in electrical components, electrochemical generators, structural parts, etc., can solve problems such as limiting the reversible specific capacity of composite electrodes, achieve good cycle stability, improve electrical conductivity, Avoid the effect of agglomeration

Active Publication Date: 2017-01-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the calcination process, the metallic nickel particles inevitably generated due to carbothermal reduction, and at the same time a high content of inactive Al 2 o 3 , which seriously limits the improvement of the reversible specific capacity of the composite electrode

Method used

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  • Graphene aerogel loaded two-phase transition metal sulfide as well as preparation method and application thereof
  • Graphene aerogel loaded two-phase transition metal sulfide as well as preparation method and application thereof
  • Graphene aerogel loaded two-phase transition metal sulfide as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. Weigh 1.746g nickel nitrate hexahydrate Ni(NO 3 ) 2 ·6H 2 O (0.006mol) and 0.873g cobalt nitrate hexahydrate Co(NO 3 ) 2 ·6H 2 O (0.003mol) (Ni:Co=2:1) ​​was dissolved in 100mL of deionized water, ultrasonicated for 10min, and mixed metal salt solution A was prepared.

[0053] 2. Dissolve the synthesized graphite oxide in 50mL of deionized water, and sonicate for 2 hours to obtain a delaminated graphite oxide aqueous solution. The graphite oxide aqueous solution after peeling was poured into the above-mentioned mixed metal salt solution A, and stirred for 2 hours to obtain a mixed solution B (the amount of graphene oxide is 5% of the mass sum of nickel nitrate and cobalt nitrate).

[0054] 3. Add ammonia water with a mass fraction of 1% dropwise into the above mixed solution B to adjust the pH to 6.5.

[0055] 4. Then transfer to a 100mL reactor, and conduct hydrothermal treatment at 150°C for 24h. After being naturally cooled to room temperature, centrifuged,...

Embodiment 2

[0063] Other conditions are identical with embodiment 1, and difference is only to take by weighing 2.6171g nickel nitrate hexahydrate Ni (NO 3 ) 2 ·6H 2 O. (Ni:Co=3:1) to get NiCo 2 S 4 / 3Ni 0.96 S / 3DGA (NiCo 2 S 4 : Ni 0.96 S=1:5.21) The battery test results are summarized in Table 1. The battery test results are summarized in Table 1.

Embodiment 3

[0065] Other conditions are identical with embodiment 1, and difference is only to take by weighing 3.490g nickel nitrate hexahydrate Ni (NO 3 ) 2 ·6H 2 O. (Ni:Co=4:1)NiCo 2 S 4 / 3Ni 0.96 S / 3DGA (NiCo 2 S 4 : Ni 0.96 S=1:7.29). The battery test results are summarized in Table 1.

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Abstract

The invention provides a graphene aerogel loaded two-phase transition metal sulfide as well as a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a three-dimensional graphene aerogel loaded nickel-cobalt hydrotalcite precursor by taking inorganic salts, namely, nickel nitrate and cobalt nitrate as raw materials, graphite oxide as a carrier and ammonia water as an alkali source and a structure-directing agent; and then, sulfurizing the precursor by taking thioacetamide (TAA) as a sulfur source, and performing calcination under an inert atmosphere to improve crystallinity, thereby obtaining graphene aerogel loaded two-phase transition metal sulfide nano-particles. The obtained graphene aerogel loaded two-phase transition metal sulfide has a nano-scale grain size, is uniformly dispersed, has a large specific area larger than that of two-dimensional graphene, is high in purity and good in electrochemical performance, and particularly has a very good reversible discharge capacity and stable cycle performance when used as a lithium ion battery cathode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanomaterials, and relates to a graphene airgel-loaded two-phase transition metal sulfide prepared by using graphene airgel-loaded nickel-cobalt hydrotalcite as a precursor, and a preparation method and application thereof. Background technique [0002] New energy technology is one of the essential ways to realize the goals and requirements of sustainable development of human resources. Lithium-ion batteries (LIBs) are expanding unprecedentedly in the markets of portable electronic products (such as cameras, notebook computers, etc.), communication equipment (such as mobile phones), and are also the new generation of hybrid electric vehicles (HEV) and pure electric vehicles (EV) in the future. A promising source of energy. The huge market demand stimulates the development of science and technology towards higher performance lithium-ion batteries such as high energy density, high ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/58H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/5815H01M4/583H01M10/0525Y02E60/10
Inventor 徐赛龙白大勋王芬张法智
Owner BEIJING UNIV OF CHEM TECH
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