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Complex Li-Mn-oxide, manufacture method and battery made of this material

A composite oxide and lithium secondary battery technology, which is applied in the field of electrochemical materials, can solve problems such as capacity fading, achieve low production costs, improve cycle performance, and be easy to industrialize

Active Publication Date: 2011-09-14
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, experiments have found that these methods have improved cycle performance during low-rate charge and discharge at room temperature, but the serious capacity fading phenomenon has not been well suppressed during deep charge and discharge, especially at high temperature 55°C.

Method used

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  • Complex Li-Mn-oxide, manufacture method and battery made of this material
  • Complex Li-Mn-oxide, manufacture method and battery made of this material
  • Complex Li-Mn-oxide, manufacture method and battery made of this material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A kind of preparation method of novel lithium manganese composite oxide:

[0053] Preparation of coating solution

[0054] Weigh lithium hydroxide monohydrate and boric acid at a molar ratio of 1:2 and add them into methanol solvent, stir for 30 minutes to dissolve lithium hydroxide monohydrate and boric acid to prepare a uniform mixed solution.

[0055] clad

[0056] Lithium hydroxide monohydrate (in the above coating solution) and lithium manganese composite oxide Li with spinel structure 1.02 mn 1.98 Ti 0.01 Cu 0.01 o 4 (Core powder) Weigh Li at a molar ratio of 0.3:100 1.02 mn 1.98 Ti 0.01 Cu 0.01 o 4 Add it into the coating solution, and keep stirring (first at a low speed of about 100 rpm, then at a medium speed of about 300 rpm) for about 4 hours.

[0057] heat treatment

[0058] Dry the coated material in an air atmosphere at 80°C for 10 hours, and after sieving (300 mesh), heat it up to 600°C at a rate of 5°C per minute in an air atmosphere in an in...

Embodiment 2

[0065] The preparation method of another kind of novel lithium manganese composite oxide:

[0066] The coating solution used in this embodiment is an ethanol solution of cobalt oxalate and lithium nitrate (the molar ratio of the two is 1:1.06), and the coating amount is cobalt oxalate and spinel core powder Li 1.01 mn 1.97 Cr 0.01 Mg 0.02 o 4 The molar ratio was 0.5:100, and the coated lithium-manganese composite oxide was dried at 90°C for 9h and then calcined at 750°C for 8h. Except above content, all the other methods are identical with embodiment 1.

[0067] The structure and electrochemical performance of the material obtained in this example (the surface of the core powder is coated with lithium-cobalt composite oxide), the test method of the normal temperature and high temperature rate cycle performance are the same as in Example 1, and the results show that the structure of the material is significantly affected by the coating. No effect, the cladding layer is mai...

Embodiment 3

[0073] Another preparation method of novel lithium-manganese composite oxide:

[0074] The coating liquid adopted in this embodiment is an aqueous solution of aluminum nitrate, and the coating amount is aluminum nitrate and spinel core powder LiMn 1.96 V 0.01 co 0.02 Ga 0.01 o 4 The molar ratio is 0.02:100, and the coated lithium-manganese composite oxide is dried at 150°C for 8h and then calcined at 700°C for 12h. Except above content, all the other methods are identical with embodiment 1.

[0075] The structure and electrochemical performance of the material obtained in this example (the surface of the core powder is coated with aluminum oxide), the test method of the normal temperature and high temperature rate cycle performance are the same as that of Example 1, and the results show that the coating has no effect on the structure of the material. The coating layer is mainly coated on the surface of the core powder lithium-manganese composite oxide in the form of an am...

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PUM

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Abstract

The present invention discloses a Li-Mn composite oxide for positive of secondary Li cell comprising the core LiaMn2-bXbO4 and a coating layer, wherein 0.97<=a<=1.06; 0 <=b<=0.5; X is a metallic element except Li and Mn or a nonmetallic element Si; the coating layer comprises one of more of Li-B composite oxide, Li-Co oxide, Li-V oxide, Al oxide, Al phosphate, Ti oxide, Cr. Oxide, Mg oxide, and Ca oxide. The Li-Mn composite oxide for positive of secondary Li cell provided by the present invention improves multiplying power charge-discharge performance of the material and reduces salvation of Mn<3+> in the electrolyte in the material and improves circulation, specially the multiplying power circulation performance at high temperature.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular, the invention relates to a novel spinel lithium-manganese composite oxide, a preparation method thereof and a battery containing the material. Background technique [0002] Although LiCoO 2 / C-series lithium-ion batteries have been used in portable electrical appliances such as mobile communications, laptop computers, and video cameras, but the lack of cobalt resources and its high price limit the use of this battery system in fixed peak-shaving power supplies and electric vehicles. aspects of promotion. However, LiMn 2 o 4 The / C system has an absolute advantage in price, and its high safety, high voltage, low pollution and other characteristics have won people's general optimism. But LiMn 2 o 4 There are serious irreversible capacity fading and very fast capacity fading during deep charge and discharge when the material is cycled or stored at high temperature (55°C)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/58C01D15/02C01G1/02C01G45/00H01M4/04H01M10/40H01M4/505H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 方送生
Owner SHENZHEN BAK POWER BATTERY CO LTD
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