Co(VO<3>)<2>-Mn(VO<3>)<2> of different morphologies, and preparation method and application thereof

A morphology, hydrothermal reactor technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problem of not preparing a pencil-head-like structure

Active Publication Date: 2017-05-17
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are very few research reports on related aspects, but none of them have prepared a pencil-like structure Co(VO 3 ) 2 -Mn(VO 3 ) 2

Method used

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  • Co(VO&lt;3&gt;)&lt;2&gt;-Mn(VO&lt;3&gt;)&lt;2&gt; of different morphologies, and preparation method and application thereof
  • Co(VO&lt;3&gt;)&lt;2&gt;-Mn(VO&lt;3&gt;)&lt;2&gt; of different morphologies, and preparation method and application thereof
  • Co(VO&lt;3&gt;)&lt;2&gt;-Mn(VO&lt;3&gt;)&lt;2&gt; of different morphologies, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1 solid unidirectional pencil point Co (VO 3 ) 2 -Mn(VO 3 ) 2 preparation of

[0062] Solid unidirectional pencil head structure Co(VO 3 ) 2 -Mn(VO 3 ) 2 The material preparation method comprises the following steps:

[0063] (1) NH 4 VO 3 Add deionized water at 70-90°C, and continue to stir for 5-10 minutes, the solution turns light yellow-green;

[0064] (2) Add CO(NH 2 ) 2 Mix with NaOH, LiOH, KOH one of the strong bases, and keep stirring until it is completely dissolved. When the above mixture is added, the concentration of the mixture in the solution is 0.05-0.08molL -1 , where CO(NH 2 ) 2 The molar number is the same as that of the above-mentioned strong base;

[0065] (3) Add the cobalt salt to the above solution, and keep stirring until the solution turns transparent reddish brown, wherein the Co:V molar ratio ranges from 1:3 to 1:5; preferably, the cobalt salt is CoCl 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Co(Ac) 2 4H 2 O etc.;

[00...

Embodiment 2

[0075] Embodiment 2 solid two-way pencil head Co (VO 3 ) 2 -Mn(VO 3 ) 2 preparation of

[0076] Solid two-way pencil head structure Co(VO 3 ) 2 -Mn(VO 3 ) 2 The material preparation method comprises the following steps:

[0077] (1) NH 4 VO 3 Add deionized water at 70-90°C, and continue to stir for 5-10 minutes, the solution turns light yellow-green;

[0078] (2) Add one of NaOH, LiOH, and KOH to the solution, and continue to stir until it is completely dissolved. The concentration of one of the strong bases of NaOH, LiOH, and KOH in the solution is 0.02-0.05molL -1 ;

[0079] (3) Add the cobalt salt to the above solution, and keep stirring until the solution turns transparent reddish brown, wherein the Co:V molar ratio ranges from 1:3 to 1:5; preferably, the cobalt salt is CoCl 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Co(Ac) 2 4H 2 O etc.;

[0080] (4) Add MnCl to the above solution 2 ·5H 2 O, keep stirring until completely dissolved, wherein the molar ratio of Mn...

Embodiment 3

[0089] Embodiment 3 Hollow two-way pencil head Co (VO 3 ) 2 -Mn(VO 3 ) 2 preparation of

[0090] Hollow two-way pencil head structure Co(VO 3 ) 2 -Mn(VO 3 ) 2 The material preparation method comprises the following steps:

[0091] (1) NH 4 VO 3 Add deionized water at 70-90°C, and continue to stir for 5-10 minutes, the solution turns light yellow-green;

[0092] (2) Add one of the strong bases NaOH, LiOH, KOH to the solution, and continue to stir until it is completely dissolved, and the concentration of one of the strong bases added in NaOH, LiOH, KOH in the solution is 0.05-0.08 moL -1 ;

[0093] (3) Add the cobalt salt to the above solution, and keep stirring until the solution turns transparent reddish brown, wherein the Co:V molar ratio ranges from 1:3 to 1:5; preferably, the cobalt salt is CoCl 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Co(Ac) 2 4H 2 O etc.;

[0094] (4) Add MnCl to the above solution 2 ·5H 2 O, keep stirring until completely dissolved, wherein...

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Abstract

The invention provides Co(VO<3>)<2>-Mn(VO<3>)<2> of different morphologies, and a preparation method and an application thereof as a negative electrode material of a lithium ion battery. The negative electrode material with different morphologies, novel, regular and tidy morphologies and relatively excellent performances, of the lithium battery can be obtained by only changing an alkali additive and controlling molar ratio of Co-Mn; the Co(VO<3>)<2>-Mn(VO<3>)<2> synthesized by the scheme has a unique crystal structure and high tap density and is a quite ideal negative electrode material, has relatively high application prospect in the lithium ion battery, expands the material taking range of the negative electrode material, has high charging-discharging specific capacity and stable cycling performance used as the negative electrode material of the lithium battery, can remarkably improve electron and ion storage capacity, and has relatively high cycling stability and high rate capability; and in addition, for powder products with regular and tidy morphologies, a quite stable crystal structure and relatively stable structure are achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium battery materials, in particular to a method for preparing Co(VO) with different shapes. 3 ) 2 -Mn(VO 3 ) 2 method and the Co 3 V 2 o 8 And its use as lithium ion battery negative electrode material. Background technique [0002] Due to the advantages of high voltage, high specific energy, wide operating temperature range, high specific power, and stable discharge, lithium batteries are widely used in various electronic products or devices. However, as the market requirements become higher and higher, it is necessary to find new Electrode materials to meet the growing demand for energy storage. The negative electrode material is the key factor to determine the lithium battery, so the development of negative electrode material becomes the key to improve the performance of lithium battery. At present, there are very few research reports on related aspects, but none of them hav...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/505
CPCH01M4/362H01M4/48H01M4/505Y02E60/10
Inventor 吴孟强杨俭陈诚文浪冯婷婷
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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