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Coating method of lithium manganite cathode material for lithium battery

A technology of using lithium manganate and cathode materials, applied in the field of new energy materials, can solve the problems of poor electrical conductivity of metal oxides and reduce the electrical conductivity of lithium manganate materials, so as to reduce structural defects, reduce direct contact, and reduce electrical losses. Effect

Active Publication Date: 2014-08-06
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among them, the surface coating of lithium manganate is mostly metal oxide. Although it can improve its cycle stability, the conductivity of metal oxide is poor, which reduces the conductivity of lithium manganate material.

Method used

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  • Coating method of lithium manganite cathode material for lithium battery
  • Coating method of lithium manganite cathode material for lithium battery
  • Coating method of lithium manganite cathode material for lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The present embodiment is spinel LiMn coated with 5% graphene 2 O 4 The coating method of the positive electrode material specifically includes the following steps:

[0029] (1) Prepare 100 ml of MnSO with a concentration of 2 mol / L 4 solution;

[0030] (2) Prepare 100 ml of sodium carbonate aqueous solution with a concentration of 2 mol / L, add ammonia water as a complexing agent, and the ammonia water concentration is 0.2 mol / L;

[0031] (3) Use a peristaltic pump to remove MnSO 4 The mixed aqueous solution of solution and sodium carbonate and ammoniacal liquor is continuously input in the reaction flask, and the flow rate is 5mL / min, and the water bath temperature of the reactor is 50 DEG C, and the slurry pH=8, and the stirring speed is 600 rmp;

[0032](4) after the reaction, the precipitation is centrifuged, washed with distilled water for many times to remove residual ions and dried at 80 °C to obtain a precursor;

[0033] (5) Combine the above precursor with...

Embodiment 2

[0038] This embodiment is spinel LiMn coated with 8% graphene 2 O 4 The coating method of the positive electrode material specifically includes the following steps:

[0039] Steps (1)-(5) are synchronized with Embodiment 1;

[0040] (6) get the above-mentioned lithium manganate 5g and disperse it in 200 ml of the ethanolic solution of graphite oxide with a concentration of 2 mg / mL, ultrasonically disperse for 0.5h, then centrifuge, and dry at 80 °C after centrifugation;

[0041] (7) Put the dried mixture of lithium manganate and graphite oxide into a vacuum tube furnace, and place it in a N 2 Fire at 600 °C for 1 h.

Embodiment 3

[0043] This embodiment is spinel LiMn coated with 5% graphene 2 O 4 The coating method of the positive electrode material specifically includes the following steps:

[0044] Steps (1)-(5) are synchronized with Embodiment 1;

[0045] (6) get the above-mentioned lithium manganate 5g and disperse it in 200 ml of graphite oxide aqueous solution with a concentration of 1.25 mg / mL, ultrasonically disperse for 1h, then centrifuge, and dry at 100 ° C after centrifugation;

[0046] (7) Put the dried mixture of lithium manganate and graphite oxide into the vacuum tube furnace, and put it in A 2 Atmosphere, 700 ° C under burning 0.5h.

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Abstract

The invention relates to a coating method of a lithium manganite cathode material for a lithium battery. The coating method comprises the steps as follows: a MnSO4 aqueous solution and a sodium carbonate aqueous solution are prepared, and a complexing agent ammonium hydroxide is added to the sodium carbonate aqueous solution; then a peristaltic pump is utilized to continuously input the mixed aqueous solution into a reaction flask; after reaction is finished, precipitation is separated centrifugally, washed repeatedly by distilled water to remove residual ions and dried; then the precipitation and Li2CO3 or LiOH are mixed and ground uniformly for calcination in a muffle furnace step by step, a calcined product is dispersed in a graphite oxide solution and subjected to ultrasonic dispersion, centrifugation and drying; and the calcined product is placed in a vacuum tube furnace and calcined in protective atmosphere at the temperature of 400 DEGC-700 DEG C. According to the coating method of the lithium manganite cathode material for the lithium battery, direct contact between the cathode material and an electrolyte solution can be effectively reduced, dissolution of Mn ions is reduced, meanwhile, the conductivity of lithium manganite is further improved, the electrical loss is reduced, and specific capacity and rate capability of the lithium manganite cathode material are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a method for coating a lithium manganese oxide cathode material for a lithium battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, and long cycle life, and are widely used in portable appliances. The LiCoO currently used commercially 2 The large-scale application of lithium-ion batteries is limited due to the small reserves and high prices. With the increasing application of lithium-ion secondary batteries, it is necessary to find a relatively cheap material to replace the currently used LiCoO 2 requirements are becoming more and more urgent. [0003] Lithium-manganese oxide materials have many advantages such as abundant resources, low price, simple preparation process, and no pollution to the environment, and are especially suitable for lithium-ion power battery cathode materials. ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/62
CPCY02E60/122H01M4/505H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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