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A nano-spherical α-mno 2 /bi 2 o 3 Materials and their preparation methods and applications

A spherical and nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of affecting the practical application of manganese dioxide materials, reducing the electrochemical stability of products, and reducing the particle size of manganese dioxide. Uneven distribution and other problems, to achieve the effect of more electrochemical active sites, improved cycle stability, and low requirements for equipment parameters and functions

Active Publication Date: 2021-03-02
浙江浙能中科储能科技有限公司
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Problems solved by technology

Pan (Pan, H.L.; Shao, Y.Y.; Yan, P.F.; Cheng, Y.W.; Han, K.S.; Nie, Z.M.; Wang, C.M.; Yang, J.H.; Li, X.L.; Bhattacharya, P.; Mueller, K.T.; Liu, J. .Nature Energy 2016,1,(5),16039.) et al prepared nano-α-MnO with good crystallization properties by hydrothermal method 2 materials, applied in water-based zinc-ion batteries to obtain higher rate performance, but the preparation method is cumbersome and needs to be carried out in a high-temperature, high-pressure reactor, and it is difficult to prepare in batches
Sandip Saha (Saha, S.; Pal, A. Separation and Purification Technology 2014, 134, 26-36.) prepared α-MnO by using potassium permanganate and manganese acetate under co-precipitation conditions. 2 materials, but the ratio of manganese acetate and potassium permanganate is 3 to 2 during the experiment, it is easy to react incompletely and cause the existence of high-valent manganese in the product, and the reaction by-product contains acetic acid, which makes the reaction The acidity in the solution is enhanced, which affects the stability of manganese dioxide. The particle size distribution of the final prepared manganese dioxide is uneven, and the agglomeration is relatively serious, thereby reducing the electrochemical stability of the product and affecting the actual performance of the manganese dioxide material. application

Method used

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  • A nano-spherical α-mno <sub>2</sub> /bi <sub>2</sub> o <sub>3</sub> Materials and their preparation methods and applications
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[0036] The invention relates to a nano-spherical α-MnO with good crystallization properties 2 / Bi 2 o 3 A material and a preparation method thereof belong to the field of zinc ion batteries. The nano-spherical α-MnO 2 / Bi 2 o 3 The material is made of α-MnO 2 The main phase (or "nano-spherical α-MnO 2 composition") and Bi 2 o 3 The second phase (or "Bi 2 o 3 Material composition") composition, the Bi 2 o 3 The content of the second phase is 0.5-10wt.%, and the nano-spherical α-MnO 2 / Bi 2 o 3 The particle size of the material is 5-500nm. Preparation of α-MnO 2 / Bi 2 o 3 The material is prepared by mixing the solution A containing potassium permanganate and foaming agent with the solution B containing low-priced manganese salt and bismuth salt in a certain way under mild conditions, and it is prepared by liquid phase co-precipitation reaction method α-MnO 2 / Bi 2 o 3 The precursor powder of the material, and its crystallization performance is improved by h...

Embodiment 1

[0052] (1) Weigh 0.4mol of potassium permanganate and 0.4mol of sodium carbonate and dissolve them in 2L of deionized water, disperse evenly, and record it as solution A; in addition, weigh 0.61mol of manganese chloride and 0.05mol of bismuth citrate to dissolve Disperse evenly in 2L of deionized water, and record it as solution B. Use an emulsifying disperser to disperse solution B, and at the same time drop solution A into solution B at a rate of 100 drops / minute, and then add 0.1 mol of ammonia water to adjust the pH to be alkaline. After the reaction was complete, the reacted mixed solution was left to stand for 24 hours, the precipitate was suction filtered and washed, and the resulting precipitated product was collected.

[0053] (2) The precipitated product of step (1) was dried in an oven at 110°C for 10 hours to obtain nano-spherical α-MnO 2 / Bi 2 o 3 The precursor powder of the material, with Figure 1a , 1b The SEM image and XRD image of its microstructure, resp...

Embodiment 2

[0057] (1) Weigh 0.35mol of potassium permanganate and 0.5mol of potassium carbonate and dissolve them in 2L of deionized water, disperse evenly, and record it as solution A; in addition, weigh 0.52mol of manganese nitrate and 0.05mol of bismuth citrate and dissolve in 2L of deionized water, dispersed evenly, recorded as solution B. Disperse solution B by ultrasonic stirring and dispersing, and drop solution A into solution B at the same time, control the dropping rate to 80 drops / min, then add 0.05mol sodium hydroxide to adjust the pH to be alkaline. After the reaction was complete, the reacted mixed solution was left to stand for 24 hours, the precipitate was suction filtered and washed, and the resulting precipitated product was collected.

[0058] (2) The precipitated product of step (1) was dried in an oven at 100°C for 10 hours to obtain nano-spherical α-MnO 2 / Bi 2 o 3 The precursor powder of the material.

[0059] (3) the nano-spherical α-MnO obtained in step (2) ...

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Abstract

The invention relates to a nano spherical alpha-MnO2 / Bi2O3 material as well as a preparation method and application thereof, the nano spherical alpha-MnO2 / Bi2O3 material is composed of an alpha-MnO2 main phase and a Bi2O3 second phase, and the content of the Bi2O3 second phase is 0.5-10wt%.

Description

technical field [0001] The invention belongs to the technical field of zinc batteries, in particular to a nano-spherical α-MnO 2 / Bi 2 o 3 The preparation method of the material and its application in the positive electrode of zinc ion battery. Background technique [0002] Manganese dioxide has structural diversity and unique physical and chemical properties, and at the same time has abundant reserves, low price, and environmental friendliness. As an important functional material, it is widely used in catalysts, adsorbents, ceramics, battery electrode materials, etc. Especially in the current energy crisis and environmental pollution and other increasingly serious problems, in order to meet people's growing demand for energy, manganese dioxide, as a pollution-free green energy material, is widely used in alkaline zinc-manganese batteries, lithium-ion batteries, super capacitors etc. [0003] Currently, rechargeable aqueous Zn / MnO 2 The battery adopts metal zinc negativ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/36B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/50H01M4/62H01M10/36Y02E60/10
Inventor 刘宇刘云召杜月秀李卓斌黄佳琪林兴灏秦刚华郑渭建
Owner 浙江浙能中科储能科技有限公司
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