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Copper-doped three-dimensional multilevel structure nickel hydroxide material and preparation method and application thereof

A nickel hydroxide, copper doping technology, applied in the direction of nickel oxide/nickel hydroxide, structural parts, nanotechnology for materials and surface science, etc., can solve the problem of not substantially improving the life and cycle stability of nickel hydroxide To improve cycle stability, simplify the preparation process, and shorten the transmission distance

Active Publication Date: 2020-06-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prepared nickel hydroxide has a high capacity, the first discharge capacity is 2237mAh g -1 , but at 100mA g -1 Only 1107mAh g is left after 30 cycles at the highest current density -1 The capacity is low, the cycle stability is poor, and the life of nickel hydroxide as the negative electrode of lithium-ion batteries has not been substantially improved.

Method used

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  • Copper-doped three-dimensional multilevel structure nickel hydroxide material and preparation method and application thereof
  • Copper-doped three-dimensional multilevel structure nickel hydroxide material and preparation method and application thereof
  • Copper-doped three-dimensional multilevel structure nickel hydroxide material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Will analyze pure NiSO 4 (6.8g) dissolved in deionized water (50mL), and magnetically stirred at 200 rpm for 15 minutes to obtain solution A;

[0045] (2) Under magnetic stirring, add Na to the solution A obtained in step (1) 2 S 2 O 8 (1.5g), stirred for 15 minutes to obtain solution B;

[0046] (3) Under magnetic stirring, add 5ml of concentrated ammonia (25%-28%) to the solution B obtained in step (2), and stir for 15 minutes to obtain solution C;

[0047] (4) To the solution C obtained in step (3), add 1 g of the copper foil of the negative electrode of a commercial lithium ion battery with a thickness of 10 μm and a purity of ≥99.8%, and let it stand at room temperature for 24 hours.

[0048] (5) After the reaction, the reaction product obtained in step (4) is collected by centrifugation, and washed with water 6 times, and then the reaction product is vacuum dried at 60° C. for 24 hours under a vacuum of 1000 Pa.

[0049] The XRD diffraction pattern of the reaction produ...

Embodiment 2

[0054] (1) Will analyze pure NiSO 4 (7.75g) was dissolved in deionized water (50mL) and magnetically stirred at 400 rpm for 18 minutes to obtain solution A;

[0055] (2) Under magnetic stirring, add Na to the solution A obtained in step (1) 2 S 2 O 8 (1g), stir for 18 minutes to obtain solution B;

[0056] (3) Under magnetic stirring, add 5ml of concentrated ammonia (25%-28%) to the solution B obtained in step (2), and stir for 18 minutes to obtain solution C;

[0057] (4) To the solution C obtained in step (3), add 1 g of the copper foil of the negative electrode of a commercial lithium ion battery with a thickness of 10 μm and a purity of ≥99.8%, and let it stand at room temperature for 40 hours.

[0058] (5) After the reaction, the reaction product obtained in step (4) is collected by centrifugation, and washed with water 8 times, and then the reaction product is vacuum-dried at 80° C. under a vacuum of 4000 Pa for 12 hours.

[0059] The reaction product is also hexagonal α-Ni(OH) 2 ...

Embodiment 3

[0064] (1) Will analyze pure NiSO 4 (3.875g) was dissolved in deionized water (50mL) and magnetically stirred at 100 rpm for 12 minutes to obtain solution A;

[0065] (2) Under magnetic stirring, add Na to the solution A obtained in step (1) 2 S 2 O 8 (2.5g), stirred for 12 minutes to obtain solution B;

[0066] (3) Under magnetic stirring, add 5ml of concentrated ammonia (25%-28%) to the solution B obtained in step (2), and stir for 12 minutes to obtain solution C;

[0067] (4) To the solution C obtained in step (3), add 1 g of the copper foil of the negative electrode of a commercial lithium ion battery with a thickness of 10 μm and a purity of ≥99.8%, and let it stand at room temperature for 30 hours.

[0068] (5) After the reaction, the reaction product obtained in step (4) is collected by centrifugation, and washed with water 10 times, and then the reaction product is vacuum dried at 70° C. for 18 hours under a vacuum of 2000 Pa.

[0069] The reaction product is also hexagonal α-Ni...

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Abstract

The invention discloses a copper-doped spherical multilevel structure nickel hydroxide material and a preparation and application thereof. The preparation method comprises the following steps: uniformly mixing a NiSO4 aqueous solution and Na2S2O8, adding concentrated ammonia water into the aqueous solution, uniformly mixing, adding copper foil, standing at room temperature for 24-40 hours, and after the reaction is finished, centrifugally collecting a reaction product, washing the reaction product with water for multiple times, and then drying the product in vacuum to obtain the copper-doped spherical multilevel structure nickel hydroxide material. The preparation method disclosed by the invention is strong in controllability and simple to operate, can be used for large-scale production ofthe lithium ion secondary battery electrode material, and can obviously prolong the cycle life of the electrode material.

Description

Technical field [0001] The invention relates to a nickel hydroxide (Ni(OH) 2 ) Materials, preparation methods and applications belong to the field of nano-functional materials and lithium ion secondary batteries. Background technique [0002] Lithium ion batteries (LIBs) are mainly composed of positive electrode, negative electrode, electrolyte, and separator. Li while charging + Out of the positive electrode, embedded in the negative electrode, when discharged, Li + It is removed from the negative electrode and inserted into the positive electrode. Because of the characteristics of lithium-ion batteries, it is also called "rocking chair battery." [0003] Lithium-ion batteries are favored by researchers due to their high volume and mass energy density (high specific capacity), high output voltage (working voltage 3.7V), low self-discharge, and long life. One of the important factors affecting the energy output of lithium-ion batteries is the specific capacity and voltage platform...

Claims

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Application Information

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IPC IPC(8): C01G53/04B82Y30/00B82Y40/00H01M4/525H01M10/0525
CPCB82Y30/00B82Y40/00C01G53/04C01P2002/72C01P2002/85C01P2004/03C01P2004/32C01P2004/61C01P2004/62C01P2004/64H01M4/525H01M10/0525Y02E60/10
Inventor 袁斌张峻豪李少波胡仁宗朱敏
Owner SOUTH CHINA UNIV OF TECH
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