Lithium-ion secondary battery and anode material and manufacturing method thereof

A secondary battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor electrochemical performance and reduced grammage capacity of materials, so as to suppress decomposition reactions, reduce contact interfaces, and prevent gas inflation Effect

Active Publication Date: 2012-09-19
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this coating can isolate the lithium titanate from the electrolyte to a certain extent, thereby inhibiting the gas production of the battery, the carbon or simple metal oxide in the coa

Method used

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  • Lithium-ion secondary battery and anode material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of negative electrode material:

[0035] Heat 0.2L of deionized water to 50°C, add a certain amount of 5mol / L reaction auxiliary ammonia water to adjust the pH value between 10.8 and 11.0, and dissolve 13.5g of cobalt sulfate (CoSO 4 ·7H 2 O) and 5.0g zirconium nitrate (Zr(NO 3 ) 4 .5H 2 (2) The mixture is dissolved in deionized water, and is configured into a mixed solution of 1mol / L for subsequent use. After the pH value in the reaction vessel is stable, add 100g lithium titanate (Li 4 Ti 5 O1 2 ) powder; in the reaction process, the NaOH solution of 5mol / L, the ammonia solution of 5mol / L, the mixed solution of cobalt sulfate and zirconium nitrate of 1mol / L are added in the reaction vessel while stirring by peristaltic pump. Control the flow rate of NaOH solution into the reaction vessel to be 3.343mL / min; the flow rate of ammonia solution into the reaction vessel is 0.886mL / min; the flow rate of cobalt sulfate and zirconium nitrate mixed solution i...

Embodiment 2

[0044] Different from Example 1 is the preparation of negative electrode material:

[0045] Heat 0.2L of deionized water to 50°C, add a certain amount of 5mol / L reaction auxiliary ammonia water to adjust the pH value between 10.8 and 11.0, and dissolve 27.0g of cobalt sulfate (CoSO 4 ·7H 2 O) be dissolved in deionized water, and be configured into a mixed solution of 1mol / L for subsequent use. After the pH value in the reaction vessel is stable, add 100g lithium titanate (Li 4 Ti 5 o 12 ) powder; in the reaction process, the NaOH solution of 5mol / L, the ammonia solution of 5mol / L, and the cobalt sulfate solution of 1mol / L were added to the reaction vessel while stirring by a peristaltic pump. Control the flow rate of NaOH solution into the reaction vessel to be 3.343mL / min; the flow rate of ammonia solution into the reaction vessel is 0.886mL / min; the flow rate of cobalt sulfate and zirconium nitrate mixed solution into the reaction vessel is 8.234mL / min. Control the pH v...

Embodiment 3

[0048] Different from Example 1 is the preparation of negative electrode material:

[0049] Heat 0.5L of deionized water to 50°C, add a certain amount of 5mol / L reaction auxiliary ammonia water and 2mol / L CH 3 COOH (oxalic acid) solution adjusts the pH value between 10.8 and 11.0, and 20g of cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) and 5.0g magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 (2) The mixture is dissolved in deionized water, and is configured into a mixed solution of 1mol / L for subsequent use. After the pH value in the reaction vessel is stable, add 100g lithium titanate (Li 4 Ti 5 o 12 ) powder; the NaOH solution of 5mol / L, the ammonia solution of 5mol / L, the CH of 2mol / L by peristaltic pump in the reaction process 3 COOH solution, 1mol / L mixed solution of cobalt nitrate and magnesium nitrate were added into the reaction vessel while stirring. The flow rate of NaOH solution added to the reaction vessel was controlled to be 3.343mL / min; the flow rate of ammonia water and...

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Abstract

The invention belongs to the technical field of lithium-ion secondary batteries, and in particular relates to an anode material for a lithium-ion secondary battery. The anode material comprises lithium titanate particles, wherein lithium cobaltate is coated on the surface of the lithium titanate particles and has the chemical formula of LixCo1-yMyO2; and the mass ratio of the lithium cobaltate to the lithium titanate particles is (0.1-10):(90-99.9). Compared with the prior art, the anode material has the advantages that the lithium cobaltate is coated on the surface of the lithium titanate particles, and the content of high-catalytic activity trivalent titanium on the surface of the lithium titanate can be reduced, so that the reaction activity of the surface of the lithium titanate on catalytic decomposition of electrolyte is effectively reduced; meanwhile, a compact coating can react with the electrolyte to form a surface passivation film, a contact interface between the surface of the lithium titanate and the electrolyte is reduced to a certain degree, the reaction between the electrolyte and the lithium titanate is correspondingly reduced; and moreover, the passivation film has high stability at high temperature, so that the battery is prevented from bloating at high temperature.

Description

technical field [0001] The invention belongs to the technical field of lithium ion secondary batteries, and in particular relates to a surface-modified lithium titanate negative electrode material for lithium ion secondary batteries, a preparation method thereof, and a lithium ion secondary battery using the lithium titanate negative electrode material. Background technique [0002] Lithium-ion secondary batteries have the advantages of high operating voltage and high specific energy, so they are widely used in many fields such as portable electronic devices, electric vehicles, and energy storage systems, and have broad application prospects. [0003] Lithium-ion secondary batteries generally include: a positive electrode sheet, a negative electrode sheet, a diaphragm and an electrolyte spaced between the positive and negative electrode sheets, wherein the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer d...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/525
CPCY02E60/122Y02E60/10
Inventor 夏恒涛
Owner NINGDE AMPEREX TECH
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