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Preparation method of high-performance lithium ion battery negative material Mn2OBO3

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problem of granular products without morphology, poor cycle stability, long reaction time, etc. problem, achieve the effect of short reaction time, low reaction temperature and simple operation

Active Publication Date: 2014-07-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above-mentioned materials have relatively high initial capacity, the capacity decays seriously after a certain number of cycles, and the cycle stability is poor.
In addition, the currently reported borate anode materials are basically synthesized by high-temperature solid-state method, the reaction time is long, the energy consumption is high, and the products are mostly granular without morphology.

Method used

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  • Preparation method of high-performance lithium ion battery negative material Mn2OBO3
  • Preparation method of high-performance lithium ion battery negative material Mn2OBO3
  • Preparation method of high-performance lithium ion battery negative material Mn2OBO3

Examples

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Effect test

Embodiment 1

[0045] Mn 2 OBO 3 Preparation of nanorod materials

[0046] 0.01mol NH 4 HB 4 O 7 ﹒ 3H 2 O was dissolved in 20 mL of deionized water, and then 0.01 mol of Mn (NO 3 ) 2 The aqueous solution was dropped into the above solution, and finally 20 mL of deionized water was added. After fully stirring and mixing for 1 hour, it was transferred to a 60 mL polytetrafluoroethylene kettle, sealed with a stainless steel kettle shell, and then placed in an oven at 220 ° C to react for 24 hours, and cooled. After reaching room temperature, carry out suction filtration to obtain Mn 3 B 7 O 13 OH nanorod precursor. Mn 3 B 7 O 13 The OH nanorod precursor was calcined at 750 °C for 12 hours in a resistance furnace in an air atmosphere to obtain Mn 2 OBO 3 Nano stave. Obtained Mn 3 B 7 O 13 OH nanorod precursor and final product Mn 2 OBO 3 The XRD and SEM results of the nanorods are as follows: figure 1 a. figure 1 b. figure 2 a. figure 2 b, from figure 1 a. figure 2...

Embodiment 2

[0048] Mn 2 OBO 3 Preparation of Nanorod Bundle Materials

[0049] 0.01mol NH 4 HB 4 O 7 ﹒ 3H 2 O was dissolved in 20 mL of ethanol, and then 0.01 mol of Mn (NO 3 ) 2 The solution was dropped into the above solution, and finally 20 mL of ethanol was added. After fully stirring and mixing for 1 hour, it was transferred to a 60 mL polytetrafluoroethylene kettle, sealed with a stainless steel kettle shell, and then placed in an oven at 220 ° C for 12 hours, and cooled to room temperature. Then carry out suction filtration to obtain MnBO 2 OH nanorod bundle precursor. MnBO 2 Mn was obtained by calcining the precursor of OH nanorod bundles at 700 °C for 5 hours in a resistance furnace in an air atmosphere. 2 OBO 3 Bundle of nanorods. The resulting MnBO 2 OH nanorod bundle precursor and final product Mn 2 OBO 3 The XRD and SEM results of nanorod bundles are as follows: figure 1 a. figure 1 c. figure 2 a. figure 2 c, from figure 1 a. figure 2 It can be seen f...

Embodiment 3

[0053] Other morphology Mn 2 OBO 3 material preparation

[0054] 0.01mol NH 4 HB 4 O 7 ﹒ 3H 2 O was dissolved in 20 mL of tetraethylene glycol, and then 0.01 mol of Mn (NO 3 ) 2 The aqueous solution was dropped into the above solution, and finally 20 mL of tetraethylene glycol was added. After fully stirring and mixing for 1 hour, it was transferred to a 60 mL polytetrafluoroethylene kettle, sealed with a stainless steel kettle shell, and then placed in an oven at 220 ° C to react for 24 hours, and cooled. After reaching room temperature, centrifugal washing is performed to obtain Mn 3 B 7 O 13 OH triangular-shaped precursor. Mn 3 B 7 O 13 The OH triangular-shaped precursor was calcined at 700 °C for 5 hours in a resistance furnace in an air atmosphere to obtain triangular-shaped Mn 2 OBO 3 .

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Abstract

The invention relates to a preparation method of a high-performance lithium ion battery negative material Mn2OBO3. The preparation method comprises the following steps of dissolving a boron source into the solvent which is one or the combination of more than two of water, methanol, ethanol, glycol, propanediol, tetraglycol and pentanol to be stirred, and heating the mixture for 20 hours to 24 hours under the condition of 200 to 220 DEG C to obtain a precursor; and calcining the precursor for 5 hours to 12 hours at the temperature of 600 to 750 DEG C to obtain the Mn2OBO3 nano material. The preparation method has the advantages of simplicity in operation, low reaction temperature, small energy consumption, controllability in product appearance and the like. By adopting the simple solvent heating-calcining method, the Mn2OBO3 material in different shapes can be synthesized by selecting different solvent raw materials, and the obtained Mn2OBO3 material has stable electrochemical performance.

Description

technical field [0001] The invention relates to a high-performance lithium ion battery negative electrode material Mn 2 OBO 3 The preparation method belongs to the technical field of electrochemistry and new energy materials. Background technique [0002] Lithium-ion secondary batteries are widely used in digital products such as mobile phones and notebook computers because of their long cycle life, high safety, no memory effect, small size, and high specific energy. However, lithium-ion batteries can not meet the application in the field of electric vehicles, the main constraints are specific capacity, cycle stability, safety and so on. The key to improving the performance of lithium-ion batteries is to improve the performance of electrode materials. So far, the anode materials actually used in lithium-ion batteries are basically carbon materials, but the low specific capacity of carbon materials cannot meet people's growing demand, so other anode materials other than ca...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B35/12B82Y30/00
CPCB82Y40/00C01B35/12H01M4/5825H01M10/0525Y02E60/10
Inventor 徐立强李爱华
Owner SHANDONG UNIV
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