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Lithium ion battery positive material as well as preparation method and lithium ion battery thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as poor safety, poor electronic conductivity of lithium iron phosphate, and unsatisfactory cycle performance, and achieve cycle Good performance, high energy density, high safety effect

Active Publication Date: 2018-02-06
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-cobalt-manganese ternary cathode material is a new cathode material for lithium-ion batteries. It has the advantages of high energy density, high voltage platform, ideal crystal structure, small self-discharge, and no memory effect. However, the material has poor thermal stability and is safe. The performance is poor, and the cycle performance under high charge cut-off voltage is not very ideal.
[0003] In order to solve the safety and cycle performance of nickel-cobalt-manganese ternary cathode materials, lithium iron phosphate and other materials are usually used in the prior art to coat and modify them to reduce the impact of lithium ions on nickel during charge and discharge. However, the electronic conductivity of lithium iron phosphate is poor, and the voltage platform is much lower than that of nickel-cobalt-manganese ternary materials. The cycle performance and safety performance of the modified positive electrode materials have not been improved. good improvement

Method used

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  • Lithium ion battery positive material as well as preparation method and lithium ion battery thereof
  • Lithium ion battery positive material as well as preparation method and lithium ion battery thereof
  • Lithium ion battery positive material as well as preparation method and lithium ion battery thereof

Examples

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Embodiment 1

[0068] A preparation method for lithium ion battery cathode material, comprising the following steps:

[0069] (1) Preparation of lithium iron vanadium phosphate precursor

[0070] Weigh 0.55g of vanadium pentoxide, 9g of oxalic acid, add 12mL of deionized water, and heat to 60°C, stir well to dissolve the raw materials to obtain a vanadium source solution; weigh 7.46g of lithium carbonate, 79.17g of iron nitrate, dihydrogen phosphate After dissolving 23.24g of ammonium in 45mL of nitric acid, add the dissolved vanadium source solution, and stir for 1 hour to obtain a mixed slurry; vacuum-dry the obtained mixed slurry at 150°C to obtain a lithium iron vanadium phosphate (LFVP) precursor .

[0071] (2) Pre-calcination of LFVP precursor: Under the protection of nitrogen atmosphere, the dried LFVP precursor powder was heated to 300 °C at a rate of 5 °C / min, and kept for 2 hours to obtain pre-calcined LFVP precursor powder.

[0072] (3) Preparation of LFVP finished product: Add ...

Embodiment 2

[0089] A preparation method for a positive electrode active material of a lithium ion battery, comprising the following steps:

[0090] (1) Preparation of lithium iron vanadium phosphate precursor

[0091] Weigh 0.092g of vanadium pentoxide, add 5mL of hydrogen peroxide and stir to fully dissolve to obtain a vanadium source solution; weigh 7.46g of lithium carbonate, 81.2g of iron nitrate, and 23.24g of ammonium dihydrogen phosphate, dissolve them in 30mL of nitric acid, and add the dissolved Vanadium source solution, weighing 2.11g citric acid as a complexing agent, complexing the above substances, stirring for 2 hours, vacuum-drying the obtained mixed slurry at 150°C to obtain a lithium iron vanadium phosphate (LFVP) precursor .

[0092] (2) Pre-calcination of LFVP precursor: Under the protection of nitrogen atmosphere, the dried LFVP precursor powder was heated to 250 °C at a rate of 5 °C / min, and kept for 3 hours to obtain pre-calcined LFVP precursor powder.

[0093] (3)...

Embodiment 3

[0099] A preparation method for a positive electrode active material of a lithium ion battery, comprising the following steps:

[0100] (1) Preparation of lithium vanadyl phosphate precursor

[0101] Weigh 4.68g of ammonium metavanadate, 4.60g of ammonium dihydrogen phosphate, and 20.82g of oxalic acid, dissolve them in 350mL of deionized water, stir in a 70°C water bath for 2 hours, and fully dissolve; then add 0.99g of lithium hydroxide and 1.0g of Sucrose, after continuous stirring and reacting for 10 hours, a mixed slurry was obtained; the resulting mixed slurry was vacuum-dried at 100°C for 4 hours to obtain lithium vanadyl phosphate (LiOVPO 4 )Precursor.

[0102] (2)LiOVPO 4 Pre-calcination of the precursor: the dried LiOVPO 4 The precursor powder was heated to 300 °C at a rate of 4 °C / min under the protection of nitrogen atmosphere, and kept for 2 hours to obtain pre-calcined LiOVPO 4 Precursor powder.

[0103] (3) Preparation of lithium vanadyl phosphate finished ...

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Abstract

The invention provides a lithium ion battery positive material. The lithium ion battery positive material is characterized by comprising nickel cobalt lithium manganate and a cladding layer arranged on the surface of the nickel cobalt lithium manganate, wherein the cladding layer is made of lithium vanadium ferrous phosphate or lithium vanadate phosphate. The cladding layer material is similar toa voltage platform of the nickel cobalt lithium manganate, so that the safety and cycling performance of a nickel cobalt manganese three-element material can be well improved, and the relatively highenergy density can also be maintained. The invention also provides a preparation method of the lithium ion battery positive material and a lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery cathode active material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which are increasingly playing an important role in various fields. As an important part of lithium-ion batteries, the cathode material of lithium batteries determines the performance, price and development of lithium batteries. Nickel-cobalt-manganese ternary cathode material is a new cathode material for lithium-ion batteries. It has the advantages of high energy density, high voltage platform, ideal crystal structure, small self-discharge, and no memory effect. However, the material has poor thermal stability and is safe. The performance is poor, and the cycle performance under high charge cut-off voltage is not very ideal. [0003] In order to solve the safety and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/525H01M4/505H01M10/0525C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 孔令涌尚伟丽陈俊奇李洁凤
Owner SHENZHEN DYNANONIC