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Prepn of Li and Mn doped composite oxide positive pole material

A technology for composite oxides and positive electrode materials, applied in lithium oxide;/hydroxide, electrode manufacturing, battery electrodes, etc., can solve problems such as high reaction temperature, low synthesis efficiency, uneven product particle size, etc., and achieve reproducible Good performance, stable performance, improved electrochemical performance and cycle performance

Inactive Publication Date: 2005-01-19
CENT SOUTH UNIV
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Problems solved by technology

[0002] The traditional solid-phase synthesis method is used to prepare spinel-type lithium manganese oxide. The disadvantages are: ①The reaction temperature is high, usually greater than 800°C, and the particle size of the product is uneven, which leads to short cycle life and specific capacity of the positive electrode material (less than 110mAh g -1 ) and other electrochemical properties are poor; ②The ratio screening of raw materials and its synthesis process are not only time-consuming, but also consume a lot of energy, resulting in low synthesis efficiency

Method used

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  • Prepn of Li and Mn doped composite oxide positive pole material

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Embodiment Construction

[0026] After weighing analytically pure lithium nitrate, electrolytic manganese dioxide treated with 50mol / L nitric acid, and analytically pure impurity salts according to the atomic ratio Li / Mn / M=0.5:0.90:0.10, add a certain amount of alcohol solution , mixed and ground into a paste, and dried at 120°C; then the temperature was raised to 300°C and kept for 10 hours; then the temperature was raised to 450°C and kept for 12 hours; finally, the temperature was raised to 150°C / min Calcined at 720°C for 45 hours; the obtained product was ground, soaked, filtered, washed, dried, and then ground again to finally obtain a black powder positive electrode material. The physical properties of the obtained cathode material: density 3.96g cm -3 , average particle size 9μm, specific surface area 3.5m 2 , the crystal form is spinel.

[0027] The battery made of the above-mentioned positive electrode material, the positive electrode is mixed with 80-85% positive electrode powder, 10-15% ac...

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Abstract

The present invention relates to the active material for secondary battery electrode, and combination chemistry and rheologic phase technology are adopted in the preparation of positive electrode material for lithium ion battery. The present invention has preparation process of low power consumption, shorten technological process, and obtained material with homogeneous granularity. The battery product with Li and Mn doped composite oxide positive electrode material has stable chemical performance and circulation performance, good reproducibility and first time discharge specific capacity of 130 mAh.g-1, and specific capacity after 50 times circulation over 110 mAh.g-1.

Description

Technical field: [0001] The invention relates to an active material for a secondary battery electrode, in particular to a preparation method for a positive electrode material of a lithium ion battery. Background technique: [0002] The traditional solid-phase synthesis method is used to prepare spinel-type lithium manganese oxide. The disadvantages are: ①The reaction temperature is high, usually greater than 800°C, and the particle size of the product is uneven, resulting in short cycle life and specific capacity of the positive electrode material (less than 110mAh g -1 ) and other electrochemical properties are poor; ②The ratio screening of raw materials and the synthesis process are not only time-consuming, but also consume a lot of energy, resulting in low synthesis efficiency. Invention content: [0003] The object of the present invention is to overcome the deficiencies in the prior art, and provide a kind of under the condition of low energy consumption, prepare the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/02H01M4/04H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M4/58H01M10/0525H01M10/36
CPCH01M4/505Y02E60/122H01M4/485H01M10/0525H01M4/525Y02E60/10
Inventor 黄可龙刘素琴潘春跃吕正中熊奇陈晓红
Owner CENT SOUTH UNIV
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