Lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems such as poor cycle performance, large volume changes, and limitations in practical applications, and achieve serious volume expansion, simple preparation methods, and improved Effect of charge-discharge cycle performance

Inactive Publication Date: 2010-01-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These research results show that although Co-Sb alloys have good charge-discharge performance, these materials all have large volume changes during charge-discharge, resulting in poor cycle performance, which limits their practical applications.

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] Preparation of antimony-cobalt-phosphorus alloy negative electrode material: Dissolve 10g of boric acid in 150ml of deionized water, add 15g of ammonium chloride, 5g of ammonium bromide and 10g of sodium hypophosphite under stirring, and adjust with dilute hydrochloric acid with a mass fraction of 5%. After the pH=1.5, 4g of cobalt chloride and 2g of antimony potassium tartrate were added, and the volume was adjusted to 250ml to obtain an electrodeposition solution. The mass ratio of the components is boric acid: ammonium chloride: ammonium bromide: sodium hypophosphite: cobalt chloride: antimony potassium tartrate=1:1.5:0.5:1.0:0.4:0.2. At room temperature, at 25.0A / dm 2 And under the condition of stirring, the antimony-cobalt-phosphorus alloy negative electrode material was obtained by electrodepositing for 20 minutes with plane copper as the current collector. XRD( figure 1 ) results show that the phase of the material is CoSb 3 , Sb and Co 2 P, EDS results ( f...

Embodiment 2

[0025] Preparation of antimony-cobalt-phosphorus alloy negative electrode material: Dissolve 10g of boric acid in 150ml of deionized water, add 5g of ammonium chloride, 2g of ammonium bromide and 2.5g of sodium hypophosphite under stirring, and use dilute hydrochloric acid with a mass fraction of 8% After adjusting the pH=2.0, 3 g of cobalt chloride and 0.2 g of antimony potassium tartrate were added respectively, and the volume was adjusted to 250 ml to obtain an electrodeposition solution. The mass ratio of the components is boric acid: ammonium chloride: ammonium bromide: sodium hypophosphite: cobalt chloride: antimony potassium tartrate=1:0.5:0.2:0.25:0.3:0.02. At room temperature, at 4.5A / dm 2 And under the condition of stirring, the antimony-cobalt-phosphorus alloy negative electrode material was obtained by electrodepositing for 20 minutes with plane copper as the current collector. XRD results show that the material phase is CoSb 3 , Sb and Co 2 P, EDS results show ...

Embodiment 3

[0027]Preparation of antimony-cobalt-phosphorus alloy negative electrode material: Dissolve 10g of boric acid in 150ml of deionized water, add 15g of ammonium chloride, 8g of ammonium bromide and 10g of sodium hypophosphite under stirring, and adjust with dilute hydrochloric acid with a mass fraction of 4%. After the pH=1.0, 4g of cobalt chloride and 1g of potassium antimony tartrate were added respectively, and the volume was adjusted to 250ml to obtain an electrodeposition solution. The mass ratio of the components is boric acid: ammonium chloride: ammonium bromide: sodium hypophosphite: cobalt chloride: antimony potassium tartrate=1:1.5:0.8:1.0:0.4:0.1. At room temperature, at 10A / dm 2 And under the condition of stirring, the antimony-cobalt-phosphorus alloy negative electrode material was obtained by electrodepositing for 10 minutes with plane copper as the current collector. XRD results show that the material phase is CoSb 3 , Sb and Co 2 P, EDS results show that its m...

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Abstract

The invention discloses a lithium ion battery cathode material and a preparation method thereof and relates to a cathode material of a lithium ion battery. The invention provides a lithium ion battery cathode material and a preparation method thereof with the advantages of environment protection, low cost, large initial volume, high charging and discharging efficiency for the first time, favorable circulation performance, easy large-scale production, and the like. The lithium ion battery cathode material is stibium-cobalt-phosphorus alloy with the content ratio by weight percent: Sb:Co:P=(44.0-95.0):(3.5-52.5):(1.5-6.5). The preparation method comprises the following steps: dissolving boric acid into water, adding ammonium chloride, ammonium bromide and secondary sodium phosphate while stirring to obtain a solution A after dissolving; regulating the pH value of the solution A to be 0.5-2.5 with hydrochloric acid, then adding cobalt chloride and antimony potassium tartrate to obtain an electrodeposit solution; and using a plane copper collector as the cathode for electrodeposit reaction to obtain the lithium ion battery cathode material.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery, in particular to an antimony-cobalt-phosphorus alloy negative electrode material of a high-capacity lithium ion battery and a preparation method thereof. Background technique [0002] At present, the negative electrode materials of commercial lithium-ion batteries are graphite and various carbon materials with graphite as precursors. Although they have good reversible charge and discharge performance, the theoretical capacity of carbon materials is low, only 372mAh / g, and its energy loss Larger, high rate charge and discharge performance is poor. When the battery is overcharged, lithium dendrites are easily formed on the carbon surface, causing short circuits and potential safety hazards. Carbon materials have been difficult to meet the needs of today's rapid development of electronic information and energy technology. Therefore, the development of new and reliable high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/04C22C19/07C22C12/00C22C30/00C25C1/24
CPCY02E60/12Y02E60/10Y02P10/20
Inventor 黄令郑小美孙世刚
Owner XIAMEN UNIV
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