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Positive pole material of lithium ion battery and preparation method of material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as deterioration of electrochemical performance, deterioration of material structure stability, and reduction of material crystallinity

Active Publication Date: 2013-03-20
宁波富理电池材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although sol-gel can cause intermolecular mixing and reaction of reactants and control the particle size of the material, this low-temperature calcination treatment will reduce the crystallinity of the material, resulting in poor structural stability and a sharp deterioration of the electrochemical performance of the material.

Method used

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  • Positive pole material of lithium ion battery and preparation method of material
  • Positive pole material of lithium ion battery and preparation method of material
  • Positive pole material of lithium ion battery and preparation method of material

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preparation example Construction

[0050] The invention provides a kind of preparation method of lithium-ion battery cathode material, comprises the following steps:

[0051] Mixing a phosphorus source compound, a manganese source compound, an M-containing compound, a lithium source compound, a carbon source compound and a surfactant in water to obtain a suspension, wherein M is Ti, Co, Fe, Mg, Al, Cr and Nb A sort of;

[0052] Under airtight conditions, the suspension is heated to obtain a positive electrode material precursor;

[0053] In an inert atmosphere, the positive electrode material precursor is calcined to obtain the lithium ion battery positive electrode material.

[0054] The present invention uses phosphorus source compounds, manganese source compounds, M-containing compounds, lithium source compounds, carbon source compounds and surfactants as raw materials. After mixing them, they are first heated and reacted to obtain a positive electrode material precursor; then the obtained positive electrod...

Embodiment 1

[0079] The mass concentration of 115.3g is 85% phosphoric acid, the manganese carbonate of 93.1g, the iron oxide of 15.17g, the lithium hydroxide of 46.16g, the sucrose of 40.46g and 2.7g sodium dodecylbenzene sulfonate are dispersed in 730g Prepare a suspension with a solid content of 30% in deionized water; then add the above suspension into the reactor, heat it to 200°C for 15 hours under closed conditions, and wash the obtained solid after the reaction is completed and cooled to room temperature , filtered and dried to obtain a lithium manganese phosphate precursor powder; then the obtained lithium manganese phosphate precursor powder was roasted at a high temperature for 8 hours under the protection of a nitrogen atmosphere, the roasting temperature was 500 ° C, and then cooled to room temperature to obtain a lithium ion battery positive electrode material .

[0080] The present invention carries out X-ray diffraction analysis to the positive electrode material of lithium...

Embodiment 2

[0093] The diammonium hydrogen phosphate of 138.66g, the manganese acetate of 220.58g, the titanium dioxide of 7.98g, the lithium carbonate of 38.79g, the sucrose of 20.3g and the deionized water of 20.3g are dispersed in the deionized water of 670g, make the solid content be 40 % of the suspension; then the above suspension was added to the reaction kettle, heated to 150 ° C under airtight conditions for 10 hours of reaction, after the reaction was completed and cooled to room temperature, the obtained solid was washed, filtered and dried to obtain lithium manganese phosphate Body powder; then the obtained lithium manganese phosphate precursor powder is calcined at a high temperature for 5 hours under the protection of nitrogen atmosphere, the calcining temperature is 600° C., and then cooled to room temperature to obtain the positive electrode material of lithium ion battery.

[0094] The present invention carries out XRD analysis to the positive electrode material that obtai...

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Abstract

The invention provides a positive pole material of a lithium ion battery. The positive pole material of the lithium ion battery comprises a plurality of sheet-like carbon composite manganese-lithium phosphate material sheets; and the sheet-like carbon composite manganese-lithium phosphate material sheets are arranged in a radial shape. The manganese-lithium phosphate has a chemical formula shown by the formula (1): LiMn1-xMxPO4 (I), wherein x is more than 0 and is less than 0.2; and M is one of Ti, Co, Fe, Mg, Al, Cr and Nb. The positive pole material of the lithium ion battery provided by the invention comprises the sheet-like carbon composite manganese-lithium phosphate material sheets; the sheet-like carbon composite manganese-lithium phosphate material sheets are arranged in the radial shape to form multiple turns, so that the diffusion path of lithium ions in manganese-lithium phosphate grains can be reduced by using the positive pole material with the shape; and meanwhile, the positive pole material with the shape has a specific surface area, so that lithium ions are rapidly deintercalated and transferred. Furthermore, the positive pole material and a battery conduction additive are sufficiently and uniformly mixed, so that the positive pole material of the lithium ion battery provided by the invention has high discharge capability and circulation property.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrode materials, in particular to a lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] The main constituent materials of lithium-ion batteries include electrolyte, separator materials, positive and negative electrode materials, etc. The positive electrode material occupies a large proportion, because the performance of the positive electrode material directly affects the performance of the lithium-ion battery, and its cost also directly determines the cost of the battery. The research of the prior art shows that the phosphate system material with olivine structure, as the positive electrode material of lithium ion battery, is obviously superior to the traditional layered structure materials in terms of safety performance and cycle life, such as lithium cobaltate, nickel acid Lithium and ternary materials, etc., the representative m...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 刘兆平夏永高陈立鹏
Owner 宁波富理电池材料科技有限公司
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