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A kind of lithium ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problem of limited improvement of cycle stability, failure to solve the problem of copper oxide volume expansion and Shrinkage and internal stress and other issues

Active Publication Date: 2020-10-30
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The Chinese patent document with the publication number CN102394305B discloses a foamed copper oxide / copper lithium-ion battery negative electrode and its preparation method, which mainly involves in-situ growth of layered copper oxide on the surface of the current collector foam copper, through in-situ growth, Nanostructure and thin film structure are used to improve the lithium battery performance of copper oxide, but this material structure does not solve the problems of volume expansion and shrinkage and internal stress of copper oxide during charge and discharge reactions, and has limited effect on improving cycle stability.

Method used

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  • A kind of lithium ion battery negative electrode material and preparation method thereof
  • A kind of lithium ion battery negative electrode material and preparation method thereof
  • A kind of lithium ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0028] Copper sulfate (CuSO 4 ), trisodium citrate and polyvinylpyrrolidone (PVP) were successively dissolved in deionized water, stirred to form a uniform aqueous solution, CuSO 4 Concentration 0.19 g L -1 , trisodium citrate concentration 0.6 g L -1 , PVP concentration 20 g L -1. Take 150 mL of the solution, and add NaOH aqueous solution (concentration 40 g L -1 ) 20 mL, after reacting for 30 min, add dropwise 10 mL of ascorbic acid solution (concentration 105 g L -1 ), stirred for 15 min, stopped stirring, and stood still for 10 h. After centrifugation, the product was washed with deionized water and absolute ethanol several times, and stored in absolute ethanol.

[0029] Take Cu 2 50 mL of absolute ethanol solution of O (concentration 2 g L -1 ), add deionized water, stir evenly, then slowly add 0.1 mL isopropyl titanate drop by drop, stir for 3 h, centrifuge and wash the product with deionized water and absolute ethanol several times, and vacuum-dry at 70°C. get n...

Embodiment 2

[0035] Copper sulfate (CuSO 4 ), trisodium citrate and polyvinylpyrrolidone (PVP) were successively dissolved in deionized water, stirred to form a uniform aqueous solution, CuSO 4 Concentration 0.38g L -1 , trisodium citrate concentration 1.2 g L -1 , PVP concentration 30 g L -1 . Take 150 mL of the solution, and add NaOH aqueous solution (concentration 40 g L -1 ) 40 mL, after 30 min of reaction, 20 mL of ascorbic acid solution (concentration 105 g L -1 ), stirred for 30 min, stopped stirring, and stood still for 15 h. After centrifugation, the product was washed with deionized water and absolute ethanol several times, and stored in absolute ethanol.

[0036] Take Cu 2 50 mL of absolute ethanol solution of O (concentration 2 g L -1 ), add deionized water, stir evenly, then slowly add 0.2 mL isopropyl titanate dropwise, stir for 3 h, centrifuge and wash the product with deionized water and absolute ethanol for several times, and vacuum dry at 70 °C. get nano TiO 2 co...

Embodiment 3

[0040] Copper sulfate (CuSO 4 ), trisodium citrate and polyvinylpyrrolidone (PVP) were successively dissolved in deionized water, stirred to form a uniform aqueous solution, CuSO 4 Concentration 0.76g L -1 , trisodium citrate concentration 2.4 g L -1 , PVP concentration 30 g L -1 . Take 150 mL of the solution, and add NaOH aqueous solution (concentration 40 g L -1 ) 80 mL, after reacting for 30 min, add dropwise 40 mL of ascorbic acid solution (concentration 105 g L -1 ), stirred for 30 min, stopped stirring, and stood still for 15 h. After centrifugation, the product was washed with deionized water and absolute ethanol several times, and stored in absolute ethanol.

[0041] Take Cu 2 50 mL of absolute ethanol solution of O (concentration 2 g L -1 ), add deionized water, stir evenly, then slowly add 0.2 mL isopropyl titanate dropwise, stir for 3 h, centrifuge and wash the product with deionized water and absolute ethanol for several times, and vacuum dry at 70 °C. get ...

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Abstract

The invention discloses a lithium ion battery negative electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: preparing Cu2O nano-cubes from copper sulfate (CuSO4), trisodium citrate, polyvinylpyrrolidone, sodium hydroxide and ascorbic acid, and coating the surface of the Cu2O with nano-TiO2 through an isopropyl titanate hydrolysis technology in order to obtain a nano-TiO2 coated Cu2O nano-cube material. The preparation method of the material has the advantages of simplicity, mild reaction conditions, no pollution to the environment, low cost and mass production. The nano-TiO2 coated Cu2O nano-cubes have remarkably improved cycle stability and charge-discharge performance as a lithium ion battery negative electrode material, and is suitable for the industrial application of the lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific capacity, no memory effect, and environmental friendliness, and have been widely used in portable electronic devices such as mobile phones, notebook computers, small cameras, and large electronic devices such as electric vehicles, electric bicycles, and electric tools. . In recent years, the rapid development of smart electronic devices has put forward higher requirements for power supplies, which urgently require power supplies with high energy density and power density, long cycle life, and good performance. The current commercial lithium-ion batteries can no longer fully meet the market demand. It has become a very important task to improve the electrochemica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/483H01M4/485H01M10/0525Y02E60/10
Inventor 严微微
Owner CHINA JILIANG UNIV
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