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Composite cathode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as limiting the application of metal oxides, losing electrochemical activity, and deteriorating electrical conductivity, and achieves good industrialization prospects and good circulation. Stability, simple production method

Active Publication Date: 2015-06-10
深圳市贝特瑞新能源技术研究院有限公司
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  • Description
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AI Technical Summary

Problems solved by technology

[0003] At present, commercially available lithium-ion batteries mainly use graphite-like carbon materials as negative electrode materials. Graphite materials have the following disadvantages: 1. The theoretical specific capacity is only 372mAh / g, and the actual capacity is lower; 2. It has a highly oriented layered structure, which is compatible with The compatibility of the organic electrolyte is very poor: 3. The graphite layer peels off during the rapid charge and discharge process, resulting in capacity attenuation; 4. The lithium intercalation potential is very close to the lithium precipitation potential, which is prone to lithium dendrites, causing potential safety hazards
Metal oxides based on these two mechanisms exhibit twice the gram capacity of graphite, but there are some disadvantages: the metal oxide itself is a semiconductor material with poor conductivity, and the Li produced in the reaction 2 O further deteriorates the conductivity; the reaction between metal oxides and Li produces a "volume expansion effect", and repeated lithium deintercalation will cause "powdering" of the electrode, which not only loses electrical contact with the current collector, but also causes the generated metal particles to "Agglomeration" leads to the loss of electrochemical activity, which eventually leads to a decrease in cycle performance, which limits the application of this metal oxide in lithium-ion batteries

Method used

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  • Composite cathode material of lithium ion battery and preparation method thereof
  • Composite cathode material of lithium ion battery and preparation method thereof
  • Composite cathode material of lithium ion battery and preparation method thereof

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preparation example Construction

[0021] The preparation method of the lithium ion battery composite negative electrode material of the present invention includes the following steps:

[0022] 1. Dissolve the zinc salt in deionized water at a zinc atom concentration of 0.1-10 mol / L, stir magnetically, at a temperature of 25-50 ℃, rotate at 10-25 r / min, and time for 30-180 min, until the zinc salt is completely dissolved , Get the zinc salt solution. The iron salt is dissolved in deionized water according to the iron atom concentration of 0.1~10mol / L, magnetically stirred, the temperature is 25~50℃, the speed is 10~25r / min, and the time is 30~180min, until the iron salt is completely dissolved. Iron salt solution.

[0023] The zinc salt is zinc nitrate, zinc chloride or zinc acetate.

[0024] The iron salt is iron nitrate, iron chloride or iron citrate.

[0025] 2. The zinc salt solution and the iron salt solution, according to the ratio of the amount of zinc salt to iron salt substance of 1~24:8, the temperature is ...

Embodiment 1

[0037] 1. Weigh 74.37g (0.25mol) Zn(NO 3 ) 2 ·6H 2 O was dissolved in 300ml of deionized water at a temperature of 25°C, a rotation speed of 10r / min, and a magnetic stirring for 180min to obtain a zinc salt solution with a zinc atom concentration of 0.83mol / L. Weigh again 202g (0.5mol) Fe(NO 3 ) 3 .9H 2 O was dissolved in another 300ml deionized water at a temperature of 25°C, a rotation speed of 10r / min, and a magnetic stirring for 180min to obtain an iron salt solution with an iron atom concentration of 1.67mol / L.

[0038] 2. Mix the zinc salt solution with the iron salt solution, the molar ratio of the zinc salt to the iron salt is 1:2, the temperature is 25°C, the speed is 10r / min, and the magnetic stirring is 180min to obtain the iron-zinc mixed solution.

[0039] 3. Slowly add 52.535g (0.25mol) C to the iron-zinc mixed solution 6 H 8 O 7 ·H 2 O, at 50℃, rotating speed 10r / min, constant temperature magnetic stirring for 120min, then add 11.88g (0.06mol) C to it 6 H 12 O 6 ·H 2 ...

Embodiment 2

[0048] 1. Weigh 67.9g (0.5mol) ZnCl 2 Dissolve in 300ml deionized water, temperature 50℃, rotating speed 25r / min, magnetic stirring for 30min, obtain zinc salt solution with zinc atom concentration of 1.67mol / L. Weigh again 202g (0.5mol) Fe(NO 3 ) 3 ·9H 2 O was dissolved in another 300ml of deionized water at a temperature of 50°C, a rotational speed of 25r / min, and magnetic stirring for 30 minutes to obtain an iron salt solution with an iron atom concentration of 1.67 mol / L.

[0049] 2. Mix the zinc salt solution with the iron salt solution, the molar ratio of zinc salt to iron salt is 1:1, the temperature is 50°C, the speed is 25r / min, and the magnetic stirring is 30min to obtain the iron-zinc mixed solution.

[0050] 3. Slowly add 105g (0.5mol) C to the iron-zinc mixed solution 6 H 8 O 7 ·H 2 O, at 70℃, rotating speed 25r / min, constant temperature magnetic stirring for 30min, then add 12g (0.06mol) C to it 6 H 12 O 6 ·H 2 O, then at 70 ℃, rotating speed 25r / min, constant temperat...

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Abstract

The invention discloses a composite cathode material of a lithium ion battery and a preparation method thereof, and mainly aims to improve the electrical chemical performance of the composite cathode material of the lithium ion battery. The composite cathode material of the lithium ion battery is a composite material formed by ZnO and FeO, or the composite material formed by coating ZnO and FeO by porous carbon C. The preparation method comprises the steps of: mixing to obtain a ferrite-zinc mixed solution, adding an organic pyrolytic carbon precursor into the ferrite-zinc mixed solution, preserving heat and solidifying, and sintering at a constant temperature. Compared with the prior art, by adopting the invention, the excellent de-lithium-intercalation ability, higher specific capacity and excellent cycling stability of transition metal oxide can be kept; the first reversible specific capacity is more than 700mAh / g, and the reversible specific capacity is more than 400mAh / g after cycling for 80 weeks; the composite cathode material is simple in manufacturing method, low in cost, little in environment pollution, and applicable to the cathode material of the lithium ion battery for lithium ion storage batteries, power batteries, various portable device, electrical tools and the like.

Description

Technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Since Gaston Plante proposed the concept of lead-acid batteries in 1859, the chemical power industry has been trying to develop new secondary batteries with high specific capacity and long cycle life. Lithium-ion battery has been officially put into use as a new type of secondary battery for 20 years. It has the advantages of high voltage (4V), high energy density, low self-discharge, long cycle life, no memory effect, and no pollution. It is widely used in portable devices such as notebook computers, mobile phones, digital cameras and electric vehicles. [0003] Currently commercially available lithium-ion batteries mainly use graphite-like carbon materials as negative electrode materials. Graphite materials have the following shortc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M4/48
CPCY02E60/10
Inventor 李子坤黄友元刘祥
Owner 深圳市贝特瑞新能源技术研究院有限公司
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