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Lithium ion battery positive pole material, preparation method of lithium ion battery positive pole material and lithium ion battery

A technology for lithium-ion batteries and cathode materials, which can be applied in battery electrodes, secondary batteries, circuits, etc., and can solve the problems of Mn material particle cracking and deterioration of cycle stability.

Pending Publication Date: 2016-05-11
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiNi 0.5 mn 1.5 o 4 During the charge-discharge cycle, and LiMn 2 o 4 Similarly, the dissolution of Mn and the cracking of material particles may occur, deteriorating the cycle stability of

Method used

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  • Lithium ion battery positive pole material, preparation method of lithium ion battery positive pole material and lithium ion battery
  • Lithium ion battery positive pole material, preparation method of lithium ion battery positive pole material and lithium ion battery
  • Lithium ion battery positive pole material, preparation method of lithium ion battery positive pole material and lithium ion battery

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preparation example Construction

[0028] The preparation method of the positive electrode material of lithium ion battery of an embodiment, comprises the following steps:

[0029] Step S110, mixing the nickel source, the manganese source and the aluminum source according to the stoichiometric ratio of each element in the chemical formula of the positive electrode material of the lithium ion battery, adding an organic solvent, and performing ball milling to obtain a mixture.

[0030] The chemical formula of lithium-ion battery cathode material is LiNi 0.5-y mn 1.5-2y al 2y o 4 , where 0<y≤0.3.

[0031] Preferably, the nickel source is selected from at least one of nickel chloride, nickel oxide, nickel sulfate, nickel nitrate and nickel acetate. Further, the nickel element in the nickel source is at least one of trivalent nickel and divalent nickel.

[0032] Preferably, the manganese source is selected from at least one of manganese chloride, manganese oxide, manganese sulfate, manganese nitrate and mangane...

Embodiment 1

[0070] The chemical formula of the lithium-ion battery cathode material prepared in Example 1 is LiNi 0.5-y mn 1.5-2y al 2y o 4 , where y=0.3, that is, the chemical formula of the prepared lithium-ion battery cathode material is LiNi 0.2 mn 0.9 al 0.6 o 4 .

[0071] The preparation method of above-mentioned lithium-ion battery cathode material comprises the following steps:

[0072] (1) Weigh nickel nitrate hexahydrate, nickel nitrate tetrahydrate and aluminum hydroxide according to the ratio of element molar ratio Ni:Mn:Al=0.2:0.9:0.6 and put them into a ball mill jar, add acetone, the quality of acetone and nickel source Ratio is 0.2:1, with the speed of 650r / min, ball milling 10h to obtain the mixture;

[0073] (2) Transfer the mixture in step (1) to a muffle furnace, heat it to 700° C. at a heating rate of 10° C. / min in an air atmosphere, and calcine at a constant temperature for 10 hours;

[0074] (3) Then naturally cool to room temperature, take out the sample, ...

Embodiment 2

[0080] The chemical formula of the lithium-ion battery cathode material prepared in Example 2 is LiNi 0.5-y mn 1.5-2y al 2y o 4 , where y=0.25, that is, the chemical formula of the prepared lithium-ion battery cathode material is LiNi 0.25 mn 1 al 0.5 o 4 .

[0081] The preparation method of above-mentioned lithium-ion battery cathode material comprises the following steps:

[0082] (1) Weigh nickel sulfate hexahydrate, manganese sulfate tetrahydrate and aluminum chloride hexahydrate according to the ratio of element molar ratio Ni:Mn:Al=0.25:1:0.5 and put them into a ball mill jar, add suitable acetone, acetone and nickel The mass ratio of the source is 0.15:1, with the speed of 650r / min, ball milling 8h obtains the mixture;

[0083] (2) the mixture in the step (1) is transferred in the muffle furnace, and the oxygen flow rate is 18m 3 / h atmosphere, heated to 700°C at a heating rate of 10°C / min, and calcined at a constant temperature for 10h;

[0084] (3) Then natu...

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Abstract

The invention relates to a lithium ion battery positive pole material, a preparation method of the lithium ion battery positive pole material and a lithium ion battery. The lithium ion battery positive pole material has a chemical formula of LiNi0.5-yMn1.5-2yAl2yO4, wherein y is greater than 0 and is less than or equal to 0.3. In the lithium ion battery positive pole material, Al<3+> can easily replace Ni<2+> and Mn<3+> and does not cause crystal form change. Through combination of Al and O, an oxygen loss in high temperature calcining is reduced and lithium ion battery positive pole material stability is improved. The content of Mn is reduced through Al so that 4V discharge plateau is reduced, 5V discharge plateau is increased and a lithium ion battery positive pole material specific capacity is improved. The lithium ion battery positive pole material can prevent lithium ion battery positive pole material particle disintegration so that cycle stability is high.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries stand out among many energy storage batteries because of their high operating voltage, high energy density, no memory effect, long cycle life, low self-discharge, and environmental friendliness, and are successfully used in mobile phones, cameras, laptops and other digital devices. Products and other portable electronic devices are expected to be widely used in the fields of electric vehicles (EV), hybrid electric vehicles (HEV) and aerospace in the near future. [0003] With the increasing seriousness of energy and environmental issues and the upgrading of digital products, the energy density requirements of lithium-ion batteries are getting higher and higher. Cathode material is a key material that determines the energy density of lithium-ion batteries. There are two main ways t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M10/0525
CPCY02E60/10
Inventor 吴春宇林建
Owner SHENZHEN BAK POWER BATTERY CO LTD
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