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Lithium cobalt oxide-doped lithium nickel cobalt manganate and preparation method thereof, and lithium ion battery containing lithium cobalt oxide-doped lithium nickel cobalt manganate

A technology of nickel-cobalt lithium manganese oxide and lithium cobalt oxide, which is applied in battery electrodes, secondary batteries, circuits, etc.

Pending Publication Date: 2016-06-29
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved the contradictory problem of increasing the capacity of lithium-ion batteries without increasing the volume

Method used

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  • Lithium cobalt oxide-doped lithium nickel cobalt manganate and preparation method thereof, and lithium ion battery containing lithium cobalt oxide-doped lithium nickel cobalt manganate
  • Lithium cobalt oxide-doped lithium nickel cobalt manganate and preparation method thereof, and lithium ion battery containing lithium cobalt oxide-doped lithium nickel cobalt manganate
  • Lithium cobalt oxide-doped lithium nickel cobalt manganate and preparation method thereof, and lithium ion battery containing lithium cobalt oxide-doped lithium nickel cobalt manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 5.26 grams of nickel sulfate, 2.249 grams of cobalt sulfate heptahydrate and 2.028 grams of manganese sulfate monohydrate. Then dissolve the three salts obtained to make 0.5 ~ 1.5mol.l -1 The solution. Weigh 3 grams of sodium hydroxide, dissolve and prepare 0.5mol.l -1 solution, titrate the dissolved solution to the mixed solution, and stir while titrating. The nickel hydroxide cobalt manganese precursor is obtained, washed with deionized water, and dried. It is then mixed with 1.478 grams of lithium carbonate and 0.640 grams of tricobalt tetroxide, and calcined a second time at a temperature of 800° C. to obtain nickel cobalt lithium manganese oxide doped with lithium cobalt oxide.

Embodiment 2

[0034] Weigh 6.308 grams of nickel sulfate, 2.249 grams of cobalt sulfate heptahydrate and 3.042 grams of manganese sulfate monohydrate. Then dissolve the three salts obtained to make 0.5 ~ 1.5mol.l -1 The solution. Weigh 3 grams of sodium hydroxide, dissolve and prepare 0.5mol.l -1 solution, titrate the dissolved solution to the mixed solution, and stir while titrating. The nickel hydroxide cobalt manganese precursor is obtained, washed with deionized water, and dried. It is then mixed with 1.478 grams of lithium carbonate and 0.640 grams of cobalt tetroxide, and calcined twice at a temperature of 800° C. to obtain nickel cobalt lithium manganese oxide doped with lithium cobalt oxide.

Embodiment 3

[0036] A 5Kg sample was prepared according to the method for preparing the material in Example 2, and the material was mixed with a conductive agent and a binder to prepare a pole piece, and finally a 18650 cylindrical battery was obtained. image 3 For the first charge and discharge curve of our full battery, it can be seen that although a certain amount of lithium cobalt oxide is mixed, the capacity loss of the material is not large. By testing the compaction of the pole piece, we obtained nickel cobalt lithium manganese oxide doped with about 20% lithium cobalt oxide, and the maximum compaction of the pole piece was from 3.56g.cm -3 Increased to 3.70g.cm -3

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Abstract

The invention discloses a lithium cobalt oxide-doped lithium nickel cobalt manganate and a lithium ion battery. A preparation method for the lithium cobalt oxide-doped lithium nickel cobalt manganate comprises the following steps: a) mixing a nickel salt, a manganese salt and a cobalt salt according to a certain mol ratio and dissolving the obtained mixture; b) titrating a mixed solution obtained in the step a) by using a hydroxide solution and carrying out stirring while titrating so as to obtain spherical cobalt manganese nickel hydroxide precursor; c) washing the precursor obtained in the step b) and drying the washed precursor at a certain temperature; and d) mixing a material obtained in the step c) with Co3oO4 and Li2CO3 according to a certain proportion and carrying out calcining at high temperature so as to obtain the lithium cobalt oxide-doped lithium nickel cobalt manganate with spheroidic morphology. A compaction coefficient is increased to 3.70 g / cm<3> from original 3.56 g / cm<3>, and influence on other performance of the material is small.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery cathode material, in particular to a quasi-spherical nickel-cobalt lithium manganate doped with lithium cobalt oxide, a preparation method thereof, and a lithium-ion battery containing the material. Background technique [0002] Lithium-ion batteries are commonly used secondary batteries now. Lithium-ion batteries have been widely used in various portable digital products after more than ten years of development because of their high operating voltage, high energy density, and long cycle life. Lithium-ion batteries are commonly used in mobile phone batteries, cameras and other electronic equipment. As these devices become more efficient, lithium-ion batteries are required to have higher capacities. For this purpose, technicians usually improve various performances of positive electrode materials and negative electrode materials. The positive ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 杨亮陈辉
Owner SHENZHEN BAK POWER BATTERY CO LTD
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