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NiCo<2>O<4>(at)Ni-B negative electrode material for lithium battery and preparation method thereof

A negative electrode material, lithium battery technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve volume change, low conductivity and other problems, and achieve improved specific capacity and good rate capability , the effect of good cycle stability

Pending Publication Date: 2020-06-05
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the deficiencies of the prior art, especially the problems of low conductivity and severe volume change in the charging and discharging process of the existing lithium-ion battery negative electrode materials, and provides a NiCo battery for lithium batteries. 2 o 4 @Ni-B negative electrode material and its preparation method

Method used

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  • NiCo&lt;2&gt;O&lt;4&gt;(at)Ni-B negative electrode material for lithium battery and preparation method thereof
  • NiCo&lt;2&gt;O&lt;4&gt;(at)Ni-B negative electrode material for lithium battery and preparation method thereof
  • NiCo&lt;2&gt;O&lt;4&gt;(at)Ni-B negative electrode material for lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: NiCo 2 o 4 material preparation

[0030] A NiCo 2 o 4 As the preparation method of lithium ion battery negative electrode material, comprise the steps:

[0031] Step (1), dissolving polyvinylpyrrolidone and 8mL glycerin in 40mL isopropanol solution, stirring and dissolving evenly at a rate of 250r / min on a magnetic stirrer, to obtain a transparent polyvinylpyrrolidone mass fraction of 0.8%-0.9%. pink solution;

[0032] Step (2), adding nickel nitrate hexahydrate and cobalt nitrate hexahydrate to the resulting mixed solution, continuing to stir on a magnetic stirrer until dissolving to obtain a homogeneous solution, wherein the mass fraction of nickel nitrate hexahydrate is 0.3%-0.4%, The mass fraction of cobalt nitrate hexahydrate is 1.0%-2.0%;

[0033] In step (3), the obtained homogeneous solution is transferred to a reaction kettle, sealed at 180° C. for 6 hours, and the obtained product is centrifuged with absolute ethanol and then dried to collect ...

Embodiment 2

[0035] Example 2: NiCo 2 o 4 Preparation of @Ni-B anode material

[0036] A kind of NiCo 2 o 4 A method for preparing @Ni-B as a lithium-ion battery negative electrode material, including the following steps:

[0037] Step (1), the NiCo that above-mentioned embodiment 1 obtains 2 o 4 The material and nickel nitrate hexahydrate were dissolved in 100mL deionized water, stirred and dissolved evenly at a rate of 500r / min on a magnetic stirrer, and a mixed salt solution was obtained;

[0038]In step (2), the obtained mixed salt solution is degassed under an argon atmosphere for 0.5 h, and then an aqueous sodium borohydride solution with a mass fraction of 0.2%-0.3% is added, and the obtained product is stirred and centrifuged;

[0039] Step (3), the obtained product is freeze-dried overnight in a vacuum oven to obtain NiCo 2 o 4 @Ni-B Composite.

[0040] Among them, NiCo 2 o 4 The mass ratio of the material to nickel nitrate hexahydrate is 1:3.

[0041] The material obt...

Embodiment 3

[0042] Embodiment 3: performance measurement

[0043] The materials obtained in the above-mentioned Example 1 and Example 2 were subjected to a battery performance test, and the specific steps were as follows:

[0044] NiCo 2 o 4 or NiCo 2 o 4 @Ni-B powder is the active material, carbon black (Super P) is the conductive agent, sodium carboxymethylcellulose (CMC) is the binder, the mass ratio of the three is 7:2:1, add deionized water and a small amount Ethanol was ball-milled on a ball mill for 2 hours to make a uniform slurry, which was coated on an aluminum foil current collector to make a pole piece of the battery. Lithium sheet as the negative electrode, polyethylene diaphragm, using 1M LiPF 6 / EC+EMC (volume ratio 1:1) is the electrolyte, and it is assembled into a button-type battery in a glove box filled with argon. Tested at 0.2A·g -1 Under the current density, after 80 cycles, NiCo 2 o 4 Discharge specific capacity maintains 709mAh·g -1 ,NiCo 2 o 4 @Ni-B e...

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Abstract

The invention discloses a NiCo<2>O<4>(at)Ni-B negative electrode material for a lithium battery and a preparation method thereof. The preparation method comprises the following steps: dissolving polyvinylpyrrolidone, nickel salt and salt into a glycerol / isopropanol mixed solution, performing uniform stirring, transferring the mixture into a reaction kettle, performing sealed constant-temperature reaction, performing centrifugal drying, and collecting a powdery product; pyrolyzing the product in the air to obtain NiCo<2>O<4>; dissolving NiCo<2>O<4> and nickel nitrate hexahydrate in deionized water, and uniformly stirring to obtain a mixed salt solution; degassing the mixed salt solution, adding a sodium borohydride aqueous solution, stirring and centrifuging; and carrying out freeze dryingon the obtained precipitate in a vacuum furnace to obtain the product. Amorphous nickel boride (Ni-B) is introduced into porous NiCo<2>O<4> nanospheres by adopting an in-situ solution growth method, the coated Ni-B component not only can be used as an anchor point of a nickel nanosphere, but also can be used as an effective electron conduction bridge to promote rapid transfer of electrons / charges,so that the electrochemical properties such as the specific capacity, the cycle life and the stability of NiCo<2>O<4> are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, in particular to a NiCo battery for lithium batteries 2 o 4 @Ni-B negative electrode material and its preparation method. Background technique [0002] At present, lithium-ion batteries have become the main power source of portable electronic products and electric vehicles, which requires higher energy density, lower cost and more environmentally friendly energy storage devices. Unfortunately, current commercial graphite anodes have a low theoretical capacity (372 mAh g -1 ), which is far from satisfying the long cruising range and long life. Therefore, there is an urgent need to develop other non-carbon alternatives to meet industrial demands. [0003] As anode materials for next-generation lithium-ion batteries, transition metal oxides have gained extensive research interest due to their high energy density, low cost, and good eco-friendliness. However, they suffer from low elect...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/523H01M4/62H01M4/624H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 李敬发申楠周琦浩任常伟李敏
Owner NANJING UNIV OF INFORMATION SCI & TECH
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