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Preparation method of lithium transition metal oxide

A lithium transition metal and transition metal technology, applied in the field of preparation of lithium transition metal oxides, can solve the problems of cumbersome operation, complicated process, difficult implementation, etc., and achieve the effects of uniform particle size distribution, uniform composition, and simple manufacturing process

Inactive Publication Date: 2004-05-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wet chemical method generally has a long process, complicated process and cumbersome operation, so it is difficult to implement in industry

Method used

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  • Preparation method of lithium transition metal oxide
  • Preparation method of lithium transition metal oxide
  • Preparation method of lithium transition metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] LiOH·H 2 O, CoO and KNO 3 Mix evenly at a molar ratio of 1:1:3, heat up to 800°C at a rate of 5°C / min in an air atmosphere, roast at a constant temperature for 1 hour, and then cool naturally with the furnace. Wash first with distilled water, then with ethanol, filter and dry at 130°C. The obtained product was shown to be pure phase LiCoO by XRD analysis 2 The particle size of the compound and the material is 1-2 μm. Charge and discharge between 2.7 and 4.3V, the specific current density is 200mA / g, the initial charge specific capacity is 141mAh / g, the discharge specific capacity is 132mAh / g, the efficiency is 93.6%, and the cycle performance is good.

Embodiment 2

[0027] Will Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O, MnCl 2 4H 2 O is made into an aqueous solution with a molar ratio of 1:1:1, and is dropped into an excess KOH aqueous solution to obtain a mixture of Co, Ni, and Mn hydroxides (CoNiMn) 1 / 3 (OH) 2 , the precipitate was washed with distilled water until neutral, filtered and dried.

[0028] LiOH·H 2 O, (CoNiMn) 1 / 3 (OH) 2 Mix with KCl at a molar ratio of 1.1:1:4, raise the temperature to 850°C at a rate of 10°C / min in an air atmosphere, roast at a constant temperature for 6 hours, and then cool down to room temperature at a rate of 20°C / min. Wash with distilled water, then with ethanol, filter and dry under vacuum at 100°C. The obtained product was shown to be pure phase Li(CoNiMn) by XRD analysis 1 / 3 o 2 compound, the particle size of the material is about 200nm. Charge and discharge between 2.5 and 4.35V, the specific current density is 1000mA / g, the first discharge can reach 115mAh / g, and the capacity decay ...

Embodiment 3

[0030] LiOH·H 2 O, CoO and KNO3 Mix well at a molar ratio of 1.15:1:2, heat up to 400°C at a rate of 1°C / min in an air atmosphere, roast at a constant temperature for 24 hours, and then cool down to room temperature at a rate of 1°C / min. Wash with distilled water, then with n-butanol, filter and dry at 130°C. The obtained product was shown to be pure phase LiCoO by XRD analysis 2 The particle size of the compound and the material is 50-100nm.

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Abstract

A process for preparing the composite oxide of Li and transition metals in order to use is as positive electrode of rechargeable Li or Li-ion battery features that the oxides, hydroxides or salts of Li and transition metal (Co, Ni and Mn) are used as raw materials, and the oxide, hydroxide or salt of Co, Ni, Mn, Cr, Al, or Mg is used as doping element, and includes mixing them with fusable salt, heating, constant-temp calcining, cooling, watshing to remove residual salt and baking. Its advantages are high reaction speed, and high specific capacity of product.

Description

technical field [0001] The invention relates to a preparation method for a rechargeable lithium or lithium ion secondary battery cathode material, in particular to a preparation method of a lithium transition metal oxide, which belongs to the technical field of high-energy battery technology, electrochemical technology or inorganic material synthesis. Background technique [0002] The preparation of cathode materials is one of the key technologies restricting the rapid development of rechargeable lithium-ion batteries. All countries have invested a lot of manpower and material resources to develop positive electrode materials with large capacity, high potential and good cycle performance. Currently, transition metal oxides commonly used as cathode materials for lithium-ion batteries include LiCoO 2 , LiNiO 2 or LiMn 2 o 4 . [0003] The conventional method currently used in industrial production is solid-phase synthesis. The high-temperature solid-phase synthesis metho...

Claims

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Application Information

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IPC IPC(8): C01B13/14C01D15/02H01M4/36H01M4/485
CPCH01M4/1391C01G53/50C01G45/1242C01G53/42H01M4/485C01P2006/40C01G51/50H01M4/525C01P2004/03C01P2002/54C01P2004/61C01G45/1228H01M4/5825Y02E60/122C01P2002/72H01M4/505C01P2004/64C01P2002/52C01G51/42H01M4/364C01P2004/62Y02E60/10
Inventor 梁宏莹邱新平何志奇朱文涛陈立泉
Owner TSINGHUA UNIV
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