Method for preparing laminar Li [Ni1/2Mn1/2]O2 material in use for lithium ion battery

A lithium-ion battery, 2mn1 technology, used in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve problems such as poor repeatability, long preparation cycle by ion exchange method, and product performance differences

Inactive Publication Date: 2007-05-09
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

But there are obvious defects in these processes. First, Ni(OH) 2 and Mn(OH) 2 Different supersaturations lead to poor repeatability of the co-precipitation process in the hydroxide system, resulting in fluctuations in the phase composition of the precursor, and then the performance of the product is very different; second, the preparation cycle of the ion exchange method is long and the production cost is high.

Method used

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  • Method for preparing laminar Li [Ni1/2Mn1/2]O2 material in use for lithium ion battery
  • Method for preparing laminar Li [Ni1/2Mn1/2]O2 material in use for lithium ion battery
  • Method for preparing laminar Li [Ni1/2Mn1/2]O2 material in use for lithium ion battery

Examples

Experimental program
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Embodiment 1

[0016] (1) Weigh Ni(NO 3 ) 2 ·6H 2 O and Mn(NO 3 ) 2 ·6H 2 O, dissolved in distilled water to form a mixed nitric acid solution;

[0017] (2) with Na 2 CO 3 As a precipitant, NiCO was prepared 3 and MnCO 3 Co-precipitate;

[0018] (3) The precipitate is pretreated at 600°C under an Ar atmosphere;

[0019] (4) Pretreatment powder and LiOH·H 2 The mixture of O (Li:(Ni+Mn) molar ratio 1.05:1) was kept at 1000°C for 15 hours in an air atmosphere, and then lowered to room temperature with the furnace to obtain Li[Ni 1 / 2 mn 1 / 2 ]O 2 Powder.

[0020] Synthetic Li[Ni 1 / 2 mn 1 / 2 ]O 2 The layered structure of the material is stable, the mixed arrangement of Li / Ni is 6.02%, and the interlayer of Li-O is 2.67 Ȧ. In the voltage range of 2.5-4.8V, the reversible capacity remained at 191mAh / g.

example 2

[0022] (1) Weigh NiSO with a molar ratio of 1:1 4 ·6H 2 O and MnSO 4 ·H 2 O, dissolved in distilled water to form a mixed sulfuric acid solution;

[0023] (2) with Li 2 CO 3 As a precipitant, NiCO was prepared 3 and MnCO 3 Co-precipitate;

[0024] (3) The precipitate is in N 2 Pretreatment at 450°C under atmosphere;

[0025] (4) Pretreatment powder and LiOH·H 2 The mixed powder of O (Li:(Ni+Mn) molar ratio 1.05:1) was kept at 920°C in an air atmosphere for 18 hours, and then cooled to room temperature with the furnace to obtain Li[Ni 1 / 2 mn 1 / 2 ]O 2 Powder.

[0026] Synthetic Li[Ni 1 / 2 mn 1 / 2 ]O 2 The layered structure of the material is stable, the mixed arrangement of Li / Ni is 6.39%, and the interlayer distance of Li-O is 2.64 Ȧ. In the voltage range of 2.5-4.8V, the reversible capacity remained at 189mAh / g.

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Abstract

Belonging to technical area of inorganic synthesis, and preparing anode material of lithium ion battery, the method modifies laminated structured material Li [Ni1 / 2Mn1 / 2] O2 in use for lithium ion battery. Characters are that coprecipitation is prepared from carbonate as precipitating agent; carrying out pretreatment at 400-850 deg.C for precursor i.e. coprecipitation under inert or reductive atmosphere. Advantages are: simple technique, good repeatability of operation, short cycle, low production costs, obvious effect of modification, lowered mixed arrangement of anode material Li / Ni to 6.0-6.5 %, stable laminated structure, and reversible capacity being as 85-200mAh / g.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthesis and the preparation of positive electrode materials for lithium ion batteries, in particular to a Li[Ni 1 / 2 mn 1 / 2 ]O 2 Preparation methods of layered structured materials. Background technique [0002] Secondary lithium-ion batteries have high operating voltage, high energy density and long service life, and provide power for more than 65% of portable electronic devices. At present, LiCoO is the cathode material commonly used in commercial lithium-ion batteries. 2 The capacity is low, and due to the scarcity and high price of Co resources, LiCoO 2 Due to the high production cost, there is an urgent need for inexpensive, environmentally friendly, and high-capacity alternative cathode materials. In 2006, there was an article entitled "Electrodes with high power and high capacity for rechargeable lithium batteries (high-energy and high-capacity secondary lithium battery cathode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/48C01D15/00C01G1/02C01G45/00C01G53/00
CPCY02E60/10
Inventor 连芳张王斌徐利华刘庆国
Owner UNIV OF SCI & TECH BEIJING
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