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Lithium molybdate negative electrode material for lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., to achieve the effect of simple preparation

Active Publication Date: 2016-10-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no literature report on lithium molybdate (Li 2 MoO 4 ) in the application of lithium-ion battery anode materials

Method used

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  • Lithium molybdate negative electrode material for lithium ion battery and preparation method thereof
  • Lithium molybdate negative electrode material for lithium ion battery and preparation method thereof
  • Lithium molybdate negative electrode material for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Will Li 2 CO 3 and MoO 2 Weigh it according to the stoichiometric ratio (molar ratio) of Li:Mo=2:1, grind it in an agate mortar for 30min, and mix well;

[0042] Then in the air atmosphere, heat up to 200 ° C for 4 hours of heat preservation pretreatment, and then grind again after natural cooling;

[0043] Then sinter in air at 500°C for 24h to obtain lithium molybdate (Li 2 MoO 4 ) anode material.

[0044] The XRD pattern of the product is shown in figure 1 (a), as can be seen from the figure, using this solid-state sintering method, a pure-phase trigonal lithium molybdate (Li 2 MoO 4 ) negative electrode material, there is no impurity peak in the spectrum, and the product has high purity. The lithium molybdate (Li 2 MoO 4 ) The negative electrode material is in the voltage range of 0.1~2.5V, and the rate is 0.33C and 0.5C respectively. The first charge and discharge and the second discharge curve are as follows figure 2 , image 3 As shown, the cycle per...

Embodiment 2

[0046] Will Li 2 CO 3 and MoO 3 Weigh according to the stoichiometric ratio of Li:Mo=2:1, add Li 2 CO 3 and MoO 3 The total mass of the precursor is 10wt% citric acid as a carbon source, and the raw material is ball milled in a planetary ball mill for 5 hours;

[0047] Under Ar gas atmosphere, heat up to 250°C for 5 hours of heat preservation pretreatment, after natural cooling, ball mill again;

[0048] Sintering was carried out at 550 °C for 15 h under Ar gas atmosphere to obtain carbon-coated lithium molybdate (Li 2 MoO 4 ) anode material.

[0049] The XRD pattern of the product is shown in figure 1 (b), as can be seen from the figure, using this solid-state sintering method, a pure-phase trigonal lithium molybdate (Li 2 MoO 4 ) negative electrode material, there is no impurity peak in the spectrum, and the product has high purity. The lithium molybdate (Li 2 MoO 4 ) The negative electrode material is within the voltage range of 0.1~2.5V, and the rate is 0.25C...

Embodiment 3

[0051] CH 3 COOLi and (NH 4 ) 2 MoO 4 Weigh according to the stoichiometric (molar ratio) ratio of Li:Mo=2:1, ball mill the raw materials in a planetary ball mill for 10 hours, and mix well;

[0052] Then, in an air atmosphere, heat preservation pretreatment was carried out at 300 ° C for 6 hours, after natural cooling, acetylene black accounting for 5 wt% of the sample mass after cooling was added, and ball milled again;

[0053] in N 2 sintering at 650°C for 12 h in an air atmosphere to obtain carbon-coated lithium molybdate (Li 2 MoO 4 ) anode material.

[0054] The XRD pattern of the product is shown in Figure 7 (a), as can be seen from the figure, using this solid-state sintering method, a pure-phase trigonal lithium molybdate (Li 2 MoO 4 ) negative electrode material, there is no impurity peak in the spectrum, and the product has high purity. The lithium molybdate (Li 2 MoO 4 ) The negative electrode material is within the voltage range of 0.1~2.5V, and the ...

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Abstract

The invention relates to a lithium molybdate cathode material for lithium ion battery and a preparation method thereof. The method includes: evenly mixing lithium salt and a molybdenum salt precursor according to stoichiometric ratio (molar ratio), heating to 200-400 DEG C in the air, carrying out heat preservation and pretreatment, and then conducting a sintering reaction in air or nitrogen, argon and carbon dioxide inert atmosphere at 500-800 DEG C, so as to obtain the lithium molybdate (Li2MoO4) cathode material for lithium ion battery. The method also includes adding a carbon material in the preparation process to carry out carbon coating on the product, wherein the carbon material is carbohydrate, acetylene black or graphite. The carbon material can be added in the mixture of precursor, or in the sintering reaction, or after the sintering reaction after sintering and sintered again. The method has simple process, and the obtained material has high actual capacity and excellent cycling performance.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to lithium molybdate negative electrode materials for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages: high working voltage, usually the voltage of a single lithium-ion battery is 3.6V, while the voltage of MH-Ni and Cd-Ni batteries is 1.2V, a difference of 3 times; small size, light weight, specific energy High (the specific energy is 3 times that of lead-acid batteries and 2 times that of various nickel batteries); long cycle life, much higher than other batteries. Safe and fast charging, low self-discharge rate; no memory effect, long use time. [0003] Therefore, since 1991, when SONY Company introduced commercialized lithium-ion batteries, the research on lithium-ion batteries has been in the ascendant. Currently, most mobile phones, notebook compute...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/583H01M4/13
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 赵彦明刘旭东董有忠
Owner SOUTH CHINA UNIV OF TECH
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