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Prussian blue analogue and preparation method, negative electrode material and application thereof

A technology of Prussian blue and negative electrode materials, applied in the field of Prussian blue analogs and their preparation, can solve the problems of poor cycle stability and low discharge capacity of lithium ion negative electrode materials.

Active Publication Date: 2021-04-23
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a Prussian blue analog and its preparation method, negative electrode material and application, aiming to solve the low discharge capacity and cycle stability of the existing lithium ion negative electrode materials poor technical problem

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  • Prussian blue analogue and preparation method, negative electrode material and application thereof
  • Prussian blue analogue and preparation method, negative electrode material and application thereof
  • Prussian blue analogue and preparation method, negative electrode material and application thereof

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preparation example Construction

[0054] 1, a kind of Prussian blue analog negative electrode material provided by the present invention, comprises Prussian blue analog, is applied to lithium ion battery, and the chemical formula of Prussian blue analog is K x Mn[R(CN) 6 ] 1-y □ y .nH 2 O, where 0≤x≤2, 0.36 ] Vacancy. The preparation method of Prussian blue analogue comprises the steps:

[0055] (1) Get K 3 R(CN) 6 The aqueous solution (or ethanol / water mixed solution), denoted as solution A;

[0056] (2) Obtain a mixed aqueous solution (or ethanol / water mixed solution) of a transition metal salt of Mn and tripotassium citrate (or polyvinylpyrrolidone, PVP, K-30), denoted as solution B;

[0057] (3) Add the solution A dropwise to the solution B, continue to heat and stir after the dropwise addition, and precipitate for several hours, separate the solid from the liquid, collect and wash the precipitate, and dry to obtain the negative electrode of the Prussian blue analog Material.

[0058] In some embo...

Embodiment 1

[0069] A Prussian blue analog negative electrode material, the chemical formula of the negative electrode material is expressed as K 0.09 Mn[Fe(CN) 6 ] 0.66 □ 0.34 3.40H 2 O, □ is [Fe(CN) 6 ] vacancies; the crystalline H of the material 2 The O content is ~24wt%, and the Mn-N bond length is 2.21445A°. The preparation method of this negative electrode material comprises the steps:

[0070] 1) Weigh 4mmol of K 3 Fe(CN) 6 , dispersed in 200mL deionized water, stirred to form a uniform solution A;

[0071] 2) Weigh 6mmol of MnSO 4 Disperse in 200mL deionized water and stir to form a uniform solution B;

[0072] 3) Use a peristaltic pump to add solution A to solution B at a rate of 5mL / min, heat and stir at 25°C for 12 hours, and after sedimentation for 12 hours, separate the precipitate from the product through a high-speed centrifuge, and use deionized water and Wash with ethanol for 3 times, and then vacuum-dry for 24 hours at a pressure of 20kPa and a temperature of ...

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Abstract

The invention discloses a prussian blue analogue and a preparation method, a negative electrode material and application thereof, which belong to the field of new energy batteries. The chemical formula of the Prussian blue analogue is KxMn[R(CN)6]1-y<vacancy>y.nH2O, x is more than or equal to 0 and less than or equal to 2, y is more than 0.3 and less than 1, and vacancy is a [R(CN)6] vacancy. The negative electrode material composed of the Prussian blue analogue is obtained at a rapid crystallization rate, and has relatively high crystal water content (24wt%) and relatively long Mn-N bond length (2.214 angstrom). The material has the advantages of being low in cost, environmentally friendly and high in Li storage capacity, transfer of 5 mol electrons can be achieved under the low potential, breakage and recombination of Mn-N bonds are involved, and stable circulation can be conducted for 1000 cycles or above with the high reversible capacity of 480 mAh g<-1> under the high current density of 1A g<-1>.

Description

technical field [0001] The invention belongs to the field of new energy batteries, and more specifically relates to a Prussian blue analogue, a preparation method thereof, an anode material and an application thereof. Background technique [0002] As an emerging green electrochemical energy source, lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect. They have been widely used in small portable consumer electronics, medium-sized electric vehicles, and large-scale electrochemical energy storage (EES). However, commercial graphite (372mAh g -1 ) and Li 4 Ti 5 o 12 (175mAh g -1 ) The low capacity of the negative electrode material cannot meet the requirements of higher energy density of the battery. With the urgent need for the development of power battery technology, it is urgent to find new negative electrode materials with large lithium storage capacity, long cycle life and safe operating voltage. [0003] Prussian bl...

Claims

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Application Information

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IPC IPC(8): C01C3/12C01C3/11H01M4/525H01M4/505H01M10/0525
CPCY02E60/10
Inventor 蒋凯唐云周敏王康丽李浩秒
Owner HUAZHONG UNIV OF SCI & TECH
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