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Negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of unsatisfactory specific capacity of batteries, high hydrothermal reaction temperature, long reaction time, etc., to reduce irreversible The effect of capacity loss, low synthesis temperature, and fine and uniform particles

Inactive Publication Date: 2014-04-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the preparation process of vanadium oxycompounds is relatively cumbersome, requiring high-temperature solid-state reaction at 800°C and subsequent ball milling process, and some hydrothermal reaction temperatures are relatively high (about 210°C), and the reaction time is relatively long.
As a lithium-ion battery anode material, its battery specific capacity is not ideal

Method used

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  • Negative electrode material of lithium ion battery and preparation method thereof
  • Negative electrode material of lithium ion battery and preparation method thereof
  • Negative electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0027] Example 1: 0.75 mmol of zinc oxide and 0.25 mmol of vanadium pentoxide were added to 8 mL of deionized water, and magnetically stirred for 30 min. The suspension was transferred to a polytetrafluoroethylene reaction kettle, sealed and heated to 140°C, kept at constant temperature for 24 hours, and then naturally cooled to room temperature. The product was centrifuged from solution and dried in air. The obtained lithium-ion battery negative electrode material powder has a shape of nanosheets, a sheet thickness of about 40 nm, and a sheet size of about 4 μm.

Embodiment 2

[0028] Example 2: 0.75 mmol of zinc oxide and 0.25 mmol of vanadium pentoxide were added to 8 mL of deionized water, and magnetically stirred for 30 min. The suspension was transferred to a polytetrafluoroethylene reactor, sealed and heated to 60°C, kept at a constant temperature for 24 hours, and then naturally cooled to room temperature. The product was centrifuged from solution and dried in air. The obtained lithium-ion battery negative electrode material powder has a flower-like multi-level structure composed of nano-sheets, and the particle size is about 2.5 μm. The results of its phase analysis are as follows figure 1 , the shape analysis results are as follows figure 2 .

Embodiment 3

[0029] Embodiment 3: by Zn 2.97 Fe 0.03 V 2 o 7 (OH) 2 (H 2 O) 2 The stoichiometric ratio of the elements in the chemical formula was weighed respectively to zinc nitrate, ammonium metavanadate and ferric nitrate, and added to 12ml of deionized water. The mixture was magnetically stirred at room temperature for 30 min and then transferred to a polytetrafluoroethylene reactor. The reaction temperature was 80° C. and the reaction time was 20 h. The product was centrifuged from solution and air dried. Obtain Fe1.0% lithium ion battery negative electrode material powder, its phase analysis is as follows image 3 Curve a, its shape is the same as that of the sample in Example 2.

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Abstract

The invention relates to a negative electrode material of a lithium ion battery and a preparation method thereof, and relates to a lithium ion battery. The invention provides a negative electrode material, which is low in preparation temperature, small in energy consumption, simple in operating process and better in electrochemical performance, of a lithium ion battery and a preparation method thereof. A chemical general formula of the negative electrode material of the lithium ion battery is Zn3-3xM3xV2O7(OH)2(H2O)2, wherein M is Fe, Co, Ni, Cu and Mn, and x is not less than 0 or not more than 0.20. The preparation method comprises the following steps: 1, weighing a zinc-containing reagent, a zinc and vanadium-containing reagent and a corresponding doping ion reagent according to the stoichiometric ratio of the chemical general formula of Zn3-3xM3xV2O7(OH)2(H2O)2, and mixing to obtain a chemical reagent; 2, ultrasonically dispersing the chemical reagent obtained in the step 1 by using deionized water which is equivalent to 444-666 times of the mole ratio of the chemical reagent obtained in the step 1 to obtain a suspension; 3, reacting the suspension obtained in the step 2 in a reaction kettle to prepare the lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high output voltage, long cycle life, high energy density, low self-discharge, no memory effect, and environmental friendliness. They have been widely used in portable electronic products such as mobile phones, cameras, and notebook computers, and are expected to become a new generation Ideal energy storage device for vehicles. The energy storage density of lithium-ion batteries depends largely on the negative electrode material. Graphitized carbonaceous materials are currently the most widely used negative electrode materials due to their high theoretical specific capacity (372mAh / g) and low cost. At present, the actual specific capacity of this type of commercial lithium-ion battery is very close to the theoretical value, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48
CPCC01G31/00H01M4/5825H01M10/0525Y02E60/10
Inventor 蒋亚琪苏静韵谢兆雄
Owner XIAMEN UNIV
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