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 material and its preparation, and can solve the problems of commercialization limitations, poor cycle performance of lithium-ion batteries, poor stability and reversibility of lattice structure, etc.

Active Publication Date: 2014-07-02
SHENZHEN INST OF ADVANCED TECH
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AI Technical Summary

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

[0034] see figure 1 , the preparation method of the lithium manganate material of one embodiment, comprises the following steps:

[0035] Step S110: Mix an aqueous solution of manganese salt with a concentration of 0.1 mol / L to 5 mol / L and an aqueous solution of carbonate with a concentration of 0.1 mol / L to 5 mol / L, stir and react for 1 to 120 minutes, separate, wash, and dry After obtaining spherical manganese carbonate.

[0036] The 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 ).

[0037] 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 ).

[0038] These manganese salts and carbonates are relatively cheap, and are water-soluble inorganic salts, so that the reaction can...

Embodiment 1

[0060] 25.1g of manganese nitrate tetrahydrate (Mn(NO 3 ) 2 ·4H 2 O) was dissolved in 1000ml of water to obtain an aqueous solution of manganese nitrate with a concentration of 0.1mol / L, and 10.6g of sodium carbonate (Na 2 CO 3 ) was dissolved in 1000 ml of water to obtain an aqueous solution of sodium carbonate with a concentration of 0.1 mol / L. Under vigorous stirring, the above-mentioned aqueous solution of sodium carbonate was poured into the aqueous solution of manganese nitrate, and after continuous stirring for 5 min, spherical manganese carbonate was obtained after suction filtration, washing and drying. Dissolve 7.938g of ammonium persulfate in 333ml of water to obtain an oxidant with a concentration of 0.1mol / L, weigh 5.75g (0.05mol) of the obtained spherical manganese carbonate and disperse it in 500ml of water, add 333ml of oxidant dropwise under vigorous stirring, and stir for 5min. Add dropwise 200 ml of hydrochloric acid with a molar concentration of 0.5 mol...

Embodiment 2

[0065] 16.9 g of manganese sulfate (MnSO 4 ·H 2 O) was dissolved in 1000ml of water to obtain an aqueous solution of manganese sulfate with a concentration of 0.1mol / L, and 138.2 potassium carbonate (K 2 CO 3 ) dissolved in 1000 ml of water to obtain an aqueous solution of potassium carbonate with a concentration of 1 mol / L. Under vigorous stirring, the above-mentioned aqueous solution of potassium carbonate was poured into the aqueous solution of manganese sulfate, and after stirring continuously for 30 min, spherical manganese carbonate was obtained after suction filtration, washing and drying. 158g potassium permanganate (KMnO 4 ) was dissolved in 1000ml of water to obtain an oxidant with a concentration of 1mol / L, weighed 11.5g (0.10mol) of spherical manganese carbonate obtained and dispersed in 1000ml of water, added 500ml of oxidant dropwise under vigorous stirring, stirred for 0.5h, and the dropwise molar concentration was 100ml of 1mol / L nitric acid, continue stirr...

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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 manganate has the advantages of abundant resources, low cost and environmental friendliness, especially because of its three-dimensional lithium deintercalation tunnel can withstand high current charge and discharge, it is recognized as one of the most promising cathode materials for lithium ion batteries. First, it is widely used in high-capacity power lithium-ion batteries. [0003] However, since manganese in lithium manganate is prone to the Jahn-Teller effect and manganese is dissolved in the electrolyte, the stability and reversibility of the lattice structure of lithium manganate during the charge-discharge cycle of lithium-ion batteries are poor, resulting in The capacity decay of lithium ion batteries is serious, and the high temperature storage and cy...

Claims

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Application Information

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Patent Type & Authority Patents(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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