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Lithium manganate material and preparation method thereof

A technology of lithium manganese oxide and manganese salt, which is applied in the field of lithium manganate materials and its preparation, and can solve the problems of lithium-ion battery capacity decay, poor cycle performance of lithium-ion batteries, commercialization restrictions, etc.

Active Publication Date: 2013-01-02
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the Jahn-Teller effect of manganese in lithium manganate and the dissolution of manganese in the electrolyte, the stability and reversibility of the lattice structure of lithium manganate during the charge and discharge cycle of lithium-ion batteries are poor, resulting in The capacity fading of lithium-ion batteries is serious, and the high-temperature storage and cycle capacity fading is more serious, which makes the cycle performance of lithium-ion batteries poor, so commercialization has been severely restricted

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  • Lithium manganate material and preparation method thereof
  • Lithium manganate material and preparation method thereof
  • Lithium manganate material and preparation method thereof

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preparation example Construction

[0037] see figure 1 , the preparation method of the lithium manganate material of an embodiment, comprises the steps:

[0038] Step S110: Mix the aqueous solution of manganese salt with a concentration of 0.1mol / L~5mol / L and the aqueous solution of carbonate with a concentration of 0.1mol / L~5mol / L, stir and react for 1 minute~120 minutes, separate, wash and dry Finally, spherical manganese carbonate is obtained.

[0039] Manganese salt is manganese acetate (C 4 h 6 MnO 4 4H 2 O), manganese nitrate (Mn(NO 3 ) 2 4H 2 O), manganese sulfate (MnSO 4 ·H 2 O) or manganese chloride (MnCl 2 ).

[0040] Carbonate is sodium carbonate (Na 2 CO 3 ), sodium bicarbonate (NaHCO 3 ), potassium carbonate (K 2 CO 3 ), potassium bicarbonate (KHCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) or ammonium bicarbonate (NH 4 HCO 3 ).

[0041] These kinds of manganese salts and carbonates are relatively cheap, and all are water-soluble inorganic salts, so that the reaction can be ca...

Embodiment 1

[0063] With 25.1g manganese nitrate tetrahydrate (Mn(NO 3 ) 2 4H 2 O) Dissolved in 1000ml water to obtain an aqueous solution of manganese nitrate with a concentration of 0.1mol / L, 10.6g of sodium carbonate (Na 2 CO 3 ) was dissolved in 1000ml of water to obtain an aqueous solution of sodium carbonate with a concentration of 0.1mol / L. Pour the above-mentioned aqueous solution of sodium carbonate into the aqueous solution of manganese nitrate under vigorous stirring, continue to stir for 5 minutes, and obtain spherical manganese carbonate after suction filtration, washing and drying. 7.938g of ammonium persulfate was dissolved in 333ml of water to obtain a concentration of 0.1mol / L of the oxidizing agent, and the obtained spherical manganese carbonate 5.75g (0.05mol) was dispersed in 500ml of water, and 333ml of oxidizing agent was added dropwise under vigorous stirring, and stirred for 5min. Add 200 ml of hydrochloric acid with a molar concentration of 0.5 mol / L dropwise, ...

Embodiment 2

[0068] 16.9g manganese sulfate (MnSO 4 ·H 2 O) Dissolved in 1000ml water to obtain an aqueous solution of manganese sulfate with a concentration of 0.1mol / L, 138.2 potassium carbonate (K 2 CO 3 ) was dissolved in 1000ml of water to obtain an aqueous solution of potassium carbonate with a concentration of 1mol / L. Pour the above aqueous solution of potassium carbonate into the aqueous solution of manganese sulfate under vigorous stirring, continue to stir for 30 minutes, and obtain spherical manganese carbonate after suction filtration, washing and drying. 158g potassium permanganate (KMnO 4 ) was dissolved in 1000ml water to obtain an oxidizing agent with a concentration of 1mol / L, and 11.5g (0.10mol) of spherical manganese carbonate obtained was weighed and dispersed in 1000ml water, and 500ml oxidizing agent was added dropwise under vigorous stirring, stirred for 0.5h, and the molar concentration was 100ml of 1mol / L nitric acid, continue to stir for 1.5h, filter with suct...

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Abstract

The invention provides a lithium manganate material. The lithium manganate material comprises microspheres formed by a plurality of lithium manganate nanoparticles with the particle size of 10-200 nanometers, and a plurality of micropores are formed among the lithium manganate nanoparticles. The lithium manganate material is applied to lithium ion batteries, and the lithium manganate material of the structure is capable of shortening diffusion paths of ions, has large specific surface area to increase the contact area between the same and electrolyte and is capable of easing capacity fading of the lithium ion batteries in the charge-discharge process, so that cycling performance of the lithium ion batteries can be improved. The invention further provides a preparation method of the lithium manganate material.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a lithium manganate material and a preparation method thereof. Background technique [0002] Spinel lithium manganese oxide has the advantages of abundant resources, low cost, and environmental friendliness, especially because of its three-dimensional intercalation lithium tunnel can withstand high current charge and discharge, it is recognized as one of the most promising positive electrode materials for lithium ion batteries First, it is widely used in high-capacity power lithium-ion batteries. [0003] However, due to the Jahn-Teller effect of manganese in lithium manganate and the dissolution of manganese in the electrolyte, the stability and reversibility of the lattice structure of lithium manganate during the charge and discharge cycle of lithium-ion batteries are poor, resulting in The capacity fading of lithium-ion batteries is serious, and the high-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCY02E60/122Y02E60/10
Inventor 孙蓉朱朋莉褚相礼周凤瑞
Owner SHENZHEN INST OF ADVANCED TECH
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