Preparation method and application of high-capacity high-temperature-resistant lithium manganate

A high-temperature lithium manganate, high-capacity technology, applied in the field of nanomaterials, can solve problems such as environmental pollution, reduced specific capacity, and intensified dissolution of manganese, and achieves the effects of easy control of reaction conditions, simple preparation method, and high charging capacity.

Active Publication Date: 2013-11-06
ADVANCED ELECTRONICS ENERGY LIMITED GUANGDONG
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AI Technical Summary

Problems solved by technology

[0009] Divalent manganese will precipitate on the negative electrode, which will reduce the content of trivalent manganese in the positive electrode and reduce its capacity, and on the other hand manganese oxides will deposit on the negative electrode Cause the negative electrode active material to fall off, greatly reducing the cycle performance of the battery (Numerical Simulation of the Effect of the Dissolution of LiMn2O4 Particles on Li-Ion Battery Performance, Jonghyun Park, Jeong Hun Seo, Gregory Plett, Wei Lu and Ann Marie Sastry, Electrochemical and Solid-State Letters, 2011, 14(2), A14 - A18)
[0011](3) Oxygen defic...

Method used

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  • Preparation method and application of high-capacity high-temperature-resistant lithium manganate

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preparation example Construction

[0053] A preparation method of high-capacity high-temperature-resistant lithium manganate, comprising the following steps:

[0054] 1) Mix manganese sulfate and ammonium persulfate in water, mix thoroughly, then add aluminum sulfate solution, mix evenly, then put the mixed material in a stainless steel hydrothermal kettle for hydrothermal reaction, and then heat it in the air to obtain the product Filtration, water washing, alcohol washing and drying are carried out to obtain thorny aluminum-doped spherical nanometer gamma-manganese dioxide.

[0055] The molar ratio of manganese and aluminum elements in the reactant Mn:Al =5~10:0.2~2, the molar ratio of manganese sulfate and ammonium persulfate in the reactant is 1:0.8~1.2; the hydrothermal reaction temperature is 80~140℃; The reaction time is 5-12 hours; the product obtained after the hydrothermal reaction is heated in air at a temperature of 80-150° C., and the heating time is 8-12 hours.

[0056] Preferably, the molar rati...

Embodiment

[0073] A preparation method of high-capacity high-temperature-resistant lithium manganate, comprising the following steps:

[0074] 1) Weigh 13.52g MnSO 4 ·H 2 O, be dissolved in 40mL water, obtain light red transparent solution, weigh 18.26g (NH 4 ) 2 S 2 o 8 , dissolved in 40mL of water to obtain a colorless and transparent solution; the two solutions were mixed and magnetically stirred at room temperature for 3 hours to obtain a solution containing MnO 2 brown-yellow suspension; weigh 3.81g Al according to the molar ratio Mn:Al=7:1 2 (SO 4 ) 3 18H 2 O, dissolved in 5mL of water to obtain a colorless transparent solution, this solution was added to the aforementioned suspension, and stirred evenly. Pour the suspension into a hydrothermal reaction kettle and react at 120°C for 8 hours ， The product was filtered, washed with water and ethanol, and baked in an oven at 100°C for 10 hours to obtain brown-black aluminum-doped γ-MnO 2 solid.

[0075] 2) Weigh Li accordi...

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Abstract

The invention discloses a preparation method and application of high-capacity high-temperature-resistant lithium manganate. The preparation method comprises a first step of enabling manganese sulfate, ammonium persulfate and aluminum sulfate to undergo a hydrothermal reaction and then be heated in air, and obtaining aluminum-doped nanometer gamma-manganese dioxide; a second step of enabling products in the first step and lithium carbonate to be dispersed in an organic solvent and undergo ball-milling crushing and drying, performing primary sintering in the presence of oxygen, and obtaining an aluminum-doped lithium manganate precursor; a third step of mixing aluminum nitrate, the aluminum-doped lithium manganate precursor and water to obtain suspension liquid, adding phosphate and polymeric dispersants in the suspension liquid, evaporating the solvent after mixing, performing secondary sintering in the presence of oxygen, and obtaining the product. The invention further discloses application of the high-capacity high-temperature-resistant lithium manganate in batteries. The product has the advantages of high charge-discharge capacity and small in circulation attenuation. The initial charge gram volume is 137.7mAh/g, and the charge gram volume is kept at 121.1 mAh/g after circulation for 30 circles. The preparation process is free of pollution, and the preparation method is high in yield and suitable for industrialized production.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and the invention relates to a preparation method and application of high-capacity and high-temperature-resistant lithium manganate. Background technique [0002] As the current main driving force, chemical petroleum fuels have brought serious problems such as exhaustion of energy resources and increasing environmental pollution. The use of power sources for new energy vehicles (EV, HEV, PHEV) is becoming a power source that may replace petroleum resources. Lithium-ion batteries have high energy density and are receiving more and more attention. There are many kinds of cathode materials for lithium-ion batteries. As a cathode material, lithium manganate has the advantages of simple preparation, low cost, high voltage, high compaction density, and high volume capacity. It has great application potential in power batteries and energy storage batteries. and advantages, but the high-temperature c...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/62
CPCY02E60/122Y02E60/10
Inventor 徐士民马毅乔校畅熊红波付永丰陈光森
Owner ADVANCED ELECTRONICS ENERGY LIMITED GUANGDONG
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