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Lithium-replenishing material li for positive electrode of lithium ion battery 5 feo 4 The preparation method and application of

A lithium-ion battery, cathode technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of metal lithium safety risks, severe process conditions, large investment, etc., and improve the first charge and discharge efficiency. , the effect of high purity and large charging capacity

Active Publication Date: 2020-11-06
湖南升容科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the most common lithium supplementation technology is divided into negative electrode lithium supplementation and positive electrode lithium supplementation. Among them, the negative electrode lithium supplementation technology mainly uses lithium powder and lithium foil to supplement the irreversible capacity loss of the negative electrode during the first charging process. The process conditions of this method are harsh. Investment Large, and the use of lithium metal poses a greater safety risk

Method used

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  • Lithium-replenishing material li for positive electrode of lithium ion battery <sub>5</sub> feo <sub>4</sub> The preparation method and application of
  • Lithium-replenishing material li for positive electrode of lithium ion battery <sub>5</sub> feo <sub>4</sub> The preparation method and application of
  • Lithium-replenishing material li for positive electrode of lithium ion battery <sub>5</sub> feo <sub>4</sub> The preparation method and application of

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of lithium-ion battery positive electrode supplement lithium material Li 5 FeO 4 The preparation method comprises the following steps:

[0028] (1) Accurately weigh 184.6g of lithium carbonate, 201.9g of ferric nitrate, 50g of citric acid, and 400g of methanol, mix well, stir at 60°C, and pass condensed water to reflux for 60min to prepare a sol;

[0029] (2) drying the sol in an oven at 120°C for 24 hours to obtain a xerogel;

[0030] (3) Under the protection of argon gas, the dry gel was pretreated at a low temperature of 450 ° C for 10 h, then cooled to room temperature, and ground. Speed ​​up to 750°C and sinter for 24 hours, then cool naturally to room temperature to obtain lithium-ion battery cathode material Li 5 FeO 4 .

[0031] Positive electrode lithium supplement material Li 5 FeO 4 The XRD chart sees figure 1 . From the XRD structure, it can be seen that pure Li 5 FeO 4 structure, no impurity appears.

[0032] Positive electrode lithium su...

Embodiment 2

[0036] A kind of lithium-ion battery positive electrode supplement lithium material Li 5 FeO 4 The preparation method comprises the following steps:

[0037] (1) Accurately weigh 125.9g of lithium hydroxide, 201.9g of ferric nitrate, 40g of citric acid, and 400g of methanol, mix well, stir at 65°C, and pass condensed water to reflux for 50min to prepare a sol;

[0038] (2) drying the sol in an oven at 100°C for 30 hours to obtain a xerogel;

[0039] (3) Under the protection of argon gas, the dry gel was pretreated at a low temperature of 400 ° C for 10 h, then cooled to room temperature, and ground. Speed ​​up to 700°C and sinter for 20 hours, then cool naturally to room temperature to obtain lithium-ion battery cathode material Li 5 FeO 4 .

[0040] The obtained positive electrode lithium supplement material Li 5 FeO 4 , Carbon black conductive agent (SP) and binder polyvinylidene fluoride (PVDF) are mixed according to the ratio of 8:1:1 by weight, and then N-methylpyr...

Embodiment 3

[0042] A kind of lithium-ion battery positive electrode supplement lithium material Li 5 FeO 4 The preparation method comprises the following steps:

[0043] (1) Accurately weigh 125.9g of lithium hydroxide, 135.1g of ferric chloride, 50g of citric acid, and 420g of methanol, mix well, stir at 70°C, and pass condensed water to reflux for 65min to prepare a sol;

[0044] (2) drying the sol in an oven at 100°C for 28 hours to obtain a xerogel;

[0045] (3) Under the protection of argon gas, the dry gel was pretreated at a low temperature of 470°C for 8 hours, then cooled to room temperature, and ground. Speed ​​up to 680°C and sinter for 28 hours, then cool naturally to room temperature to obtain lithium-ion battery cathode material Li 5 FeO 4 .

[0046] The obtained positive electrode lithium supplement material Li 5 FeO 4 , Carbon black conductive agent (SP) and binder polyvinylidene fluoride (PVDF) are mixed according to the ratio of 8:1:1 by weight, and then N-methylp...

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Abstract

The invention discloses a lithium-ion battery cathode lithium supplement material Li 5 FeO 4 The preparation method and application of the invention belong to the field of lithium ion batteries. Specifically, firstly, a lithium-containing material is used as a lithium source, an iron-containing material is used as an iron source, and a complexing agent and a solvent are used as raw materials to synthesize a stable sol. The sol is dried to obtain a xerogel, and the xerogel is protected by an inert atmosphere. After sintering, the positive electrode lithium supplement material Li 5 FeO 4 . Lithium-ion battery cathode lithium supplement material Li proposed by the present invention 5 FeO 4 The preparation method has the advantages of low cost, simple equipment and process, and the obtained Li 5 FeO 4 The positive electrode lithium supplement material has uniform particles, complete structure, and high purity. It is used as a lithium ion battery positive electrode lithium supplement material with a large charging capacity and a small discharge capacity, thereby supplementing the Li in the first charge and discharge process of the lithium battery. + Loss.

Description

technical field [0001] The invention relates to a lithium-ion battery cathode lithium supplement material Li 5 FeO 4 The preparation method and application of the invention belong to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages such as high voltage, high energy density and long cycle life. However, with the miniaturization of portable electronic devices, the continuous development of long-term standby, and the use of high-power and high-energy devices such as electric bicycles and electric vehicles, the energy density of lithium-ion batteries as energy storage power sources has been increasingly raised. high demands. [0003] During the first charging process of the battery, the solid electrolyte interfacial film (SEI film) formed on the surface of the negative electrode will consume part of the Li migrated from the positive electrode. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/62H01M10/0525C01G49/00
CPCC01G49/0027H01M4/525H01M4/621H01M4/624H01M10/0525Y02E60/10
Inventor 原国森韩艳艳游晓燕张庆张宁李兴霞崔国明
Owner 湖南升容科技有限公司
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