Method for improving stability of anode material of lithium ion battery

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of material performance deterioration, material capacity decay, poor cycle stability, etc., to improve cycle performance and improve energy density. , the effect of improving thermal stability and cycle stability

Inactive Publication Date: 2013-03-13
TIANJIN B&M SCI & TECH
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AI Technical Summary

Problems solved by technology

However, due to the Jahn-Teller effect, the manganese-oxygen octahedral structure inside the spinel-type lithium manganese oxide material is not stable during the charge-discharge cycle, and the dissolution of divalent manganese causes the material capacity to decay quickly and the cycle stability not good
Material performance deteriorates further when temperature rises

Method used

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  • Method for improving stability of anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] at 100dm 3 Add 50dm to the reactor 3 Pure water, turn on the stirring device, add 15kg of lithium manganate material, fully stir and disperse. Prepare 0.1mol·dm -3 cerium nitrate solution and 0.1mol dm -3 diammonium hydrogen phosphate solution. Use a metering pump to separate the above two solutions at a distance of 50 cm 3 min -1 The rate is injected into the reactor at multiple points, and the injection is stopped after 170 minutes. After continuing to stir for 30 minutes, the mixture in the reaction kettle was introduced into a centrifugal filter, and the solid matter was fully washed in the centrifugal filter. The solid obtained after filtering and washing was placed in an oven at 105° C. for drying. The dried solid was incubated at 500°C for 8h. After cooling, the obtained solids are pulverized, classified and sieved to obtain the product.

[0030] The cycle stability of the product made in this example is significantly improved compared with the untreated...

Embodiment 2

[0032] at 8m 3 Add 3m to the reactor 3 Pure water, turn on the stirring device, add 7000kg of lithium cobalt oxide material, fully stir and disperse. Prepare 1.0mol·dm -3 cerium chloride solution and 1.0mol dm -3 sodium phosphate solution. Use a metering pump to separate the above two solutions at 2.0dm 3 min -1 The rate is injected into the reactor at multiple points, and the injection is stopped after 150 minutes. After continuing to stir for 30 minutes, the mixture in the reaction kettle was introduced into a filter press, and the solids were fully washed in the filter press. The solid obtained after filtering and washing was placed in an oven at 150° C. for drying. The dried solid was incubated at 800°C for 2h. After cooling, the obtained solids are pulverized, classified and sieved to obtain the product.

[0033] The cycle stability of the product prepared in this example is significantly improved compared with the untreated material. Under the charge cut-off vol...

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Abstract

The invention discloses a method for improving the stability of an anode material of a lithium ion battery, comprising the following steps of: 1) in a reaction kettle, dispersing the anode material of the lithium ion battery into water to enable the mass content of a solid material to be 20-70%; sufficiently agitating to keep a suspension solution uniform; 2) utilizing a metering pump to inject a Ce<3+>-containing solution and a PO4<3->-containing solution into the suspension solution in a mol ratio that Ce<3+> to PO4<3-> is 1: 1; sufficiently reacting; 3) filtering and washing the solid material; 4) drying the obtained solid material at 90-150 DEG C; 5) carrying out heat treatment on the dried solid material at 500-800 DEG C for 2-8 hours; and 6) crushing and sieving a product which is subjected to the heat treatment to obtain a product. According to the method disclosed by the invention, the thermal stability and the circulating stability of the material can be improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for improving the stability of positive electrode materials of lithium-ion batteries. Background technique [0002] Lithium-ion battery is a secondary battery with high energy density, high power density and long life, which plays an important role in modern society. Small lithium-ion batteries play an irreplaceable role in small mobile devices such as mobile phones, tablet computers, and notebook computers. Applications in this field require high energy density and safety of lithium-ion batteries. Power lithium-ion batteries are ideal power sources for large-scale, high-power equipment such as electric vehicles, hybrid vehicles, and electric tools. In such large-scale, high-power applications, the safety, energy and power density of lithium-ion batteries , cost, etc. have higher requirements. In lithium-ion batteries, the cathode material is one of the decisive fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 赵明吴孟涛徐宁陈勃涛
Owner TIANJIN B&M SCI & TECH
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