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Phase transition synthesizing method for doping lithium manganate powder

A synthesis method and technology of lithium heteromanganate, applied in the direction of manganese compounds, lithium compounds, chemical instruments and methods, etc., can solve the problems of poor uniformity, capacity attenuation, and unstable structure of lithium manganate powder

Inactive Publication Date: 2005-01-26
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesized lithium manganese oxide powder has poor uniformity. As an electrode material, there are mainly problems such as capacity attenuation and structural instability, which have not been well resolved, so commercial mass production has not yet been realized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Synthesis of cobalt-doped lithium manganese oxide LiNi by phase transfer method using lithium acetate, manganese acetate and cobalt nitrate as raw materials 0.15 Ca 0.05 mn 1.8 o 4 compound of.

[0013] 1. According to the chemical formula LiNi of the synthesized product 0.15 Ca 0.05 mn 1.8 o 4 Calculate the amount of each main raw material used.

[0014] Synthesis of 1 mole of LiNi 0.15 Ca 0.05 mn 1.8 o 4 Requires 1 mole of lithium acetate, 1.8 moles of manganese acetate, 0.15 moles of nickel acetate and 0.05 moles of calcium hydroxide. Considering that in order to make the reaction fully complete, 10% lithium acetate needs to be added, so the consumption of lithium acetate is 1.1 moles.

[0015] 2. According to experiments, the volume ratio of 7% CTAB solution and white oil used for phase transfer in the preparation process to the reaction system is 20:80.

[0016] 3. Accurately weigh the above raw materials and add water to make a solution. The prepared...

Embodiment 2

[0019] Synthesis of cobalt-doped lithium manganese oxide LiMn by phase transfer method using lithium acetate, manganese acetate and nickel acetate as raw materials 1.8 Ni 0.2 o 4 compound of.

[0020] 1. According to the chemical formula LiNi of the synthesized product 0.2 mn 1.8 o 4 Calculate the amount of each main raw material used.

[0021] Synthesis of 1 mole of LiNi 0.2 mn 1.8 o 4 Requires 1 mole of lithium acetate, 1.8 moles of manganese acetate, and 0.2 moles of nickel acetate. Considering that in order to make the reaction fully complete, 20% lithium nitrate needs to be added, so the consumption of lithium nitrate is 1.2 moles.

[0022] 2. According to the experiment, the volume ratio of adding 7% CTAB solution and white oil to the reaction system is 20:80.

[0023] 3. Accurately weigh the above raw materials and add water to make a solution. The prepared solution was added to the reaction kettle, and the reaction was carried out under strong stirring by co...

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Abstract

The invention relates to a method of synthesizing active material of lithium battery anode, specially a phase transfer synthesizing method that synthesizes doped LiMn2O4 powder by doping one or two of the elements: Ni, Ca, Co, Ti, Ga, etc. (1) using lithium acetate, Mn salt and nitrates of doping elements as main material, using organic white oil and CTAB as auxiliary material; (2) preparing the main material according to chemical formula of object product into solution in a reaction kettle, and making synthetic reaction by stirring at 70deg.C-80deg.C; (3) adding CTAB and white oil in a proper bulk ratio to resultant system, keeping temperature and stirring for 0.5 hour, then placing still, separating phase, discarding water phase, drying, cauterizing at 800 deg.C-850 deg.C for 12-15 hours in box electric cooker, cooling with the cooker, and then grinding and scattering to obtain the doped-LiMn2O4 active powder material with stale structure and good electrochemical performance. The method is simple to operate, and the synthetic product has good electrochemical performance.

Description

technical field [0001] The invention relates to a method for synthesizing positive electrode active materials of lithium ion batteries. Especially by doping one or two kinds of elements such as nickel, calcium, cobalt, titanium, gallium and so on to synthesize the phase transfer synthesis method of doped lithium manganese oxide powder. Background technique [0002] The key material for the research and development of high-performance and low-cost lithium-ion batteries lies in the selection of positive electrode materials. At present, more than 95% of lithium-ion batteries sold at home and abroad use lithium cobalt oxide as the positive electrode material. However, due to the lack of cobalt resources and high price, its waste products seriously pollute the environment, which greatly restricts its commercialization process and wide application. Due to the low price of manganese, abundant resources, non-toxic, non-polluting and environmentally friendly, doped lithium manganate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00C01G45/00H01M4/02H01M4/04H01M4/48H01M4/50
CPCH01M4/1391H01M4/505Y02E60/122C01G51/54C01G45/1242C01G53/54C01P2006/40H01M4/0471C01P2002/52C01P2002/54Y02E60/10
Inventor 刘长久柴小琴尚伟
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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