Lithium ion battery positive electrode material and preparation method thereof, and battery

A technology for lithium-ion batteries and positive electrode materials, which can be used in battery electrodes, secondary batteries, circuits, etc., and can solve problems such as limited performance of positive electrode materials

Active Publication Date: 2019-05-03
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, a phosphate coating layer is formed, but the improvement of the performance of the positive electrode material is limited

Method used

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  • Lithium ion battery positive electrode material and preparation method thereof, and battery
  • Lithium ion battery positive electrode material and preparation method thereof, and battery
  • Lithium ion battery positive electrode material and preparation method thereof, and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Add 0.08g of LiH 2 PO 4 Dissolved in 10mL of water to make a solution, then 10g of Ni 0.88 mn 0.12 (OH) 2 Adding it to the above solution, stirring under magnetic force until the solution is evaporated to dryness, and roasting the obtained material at 300°C for 10 hours to obtain a precursor with a coating layer;

[0045] 2) The precursor with coating layer obtained in step 1) was mixed with LiOH at a mass ratio of 100:48, and then calcined at 830° C. for 10 h to obtain positive electrode material A.

[0046] The positive electrode material A includes the positive active component LiNi 0.88 mn 0.12 o 2 and Li 2 h 2 P 2 o 7 cladding. The positive electrode material A is subjected to XRD test, and there is Li with a 2θ of 23° in the obtained spectrum. 2 h 2 P 2 o 7 Characteristic peaks. The thickness of the coating layer is 5nm, and the content of the active component in the positive electrode material is 99% by weight.

Embodiment 2

[0048] 1) Add 0.05g of (NH 4 ) 2 HPO 4 Dissolved in 10mL of water to make a solution, then 10g of Ni 0.88 mn 0.12 (OH) 2 Adding it to the above solution, stirring under magnetic force until the solution is evaporated to dryness, and roasting the obtained material at 260° C. for 8 hours to obtain a precursor with a coating layer;

[0049] 2) Combine the precursor with coating obtained in step 1) with Li 2 CO 2 Mix according to the mass ratio of 100:45, and then bake at 800° C. for 10 h to obtain positive electrode material B.

[0050] The positive electrode material B includes the positive active component LiNi 0.88 mn 0.12 o 2 and Li 2 h 2 P 2 o 7 cladding. The positive electrode material B is subjected to XRD test, and there is Li with a 2θ of 23° in the obtained spectrum 2 h 2 P 2 o 7 Characteristic peaks. The thickness of the coating layer is 7nm, and the content of the active component in the positive electrode material is 98.7% by weight.

Embodiment 3

[0052] Carry out according to the method of Example 1, the difference is that the temperature for calcination in step 1) is 370° C. to obtain positive electrode material C.

[0053] The positive electrode material C includes the positive active component LiNi 0.88 mn 0.12 o 2 and LiPO 3 cladding. The positive electrode material C was tested by XRD, and the obtained spectrum contained LiPO with a 2θ of 22° 3 Characteristic peaks. The thickness of the coating layer is 6nm, and the content of the active component in the positive electrode material is 99% by weight.

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery positive electrode material and a preparation method thereof, and a battery. The method includes the following steps: 1) a precursor of the lithium ion battery positive electrode material is mixed with phosphate, and then low temperature calcination is performed to obtain the precursor havingpyrophosphate or metaphosphate coating layers on the surface; and 2) the precursor is mixed with a lithium salt, and high temperature calcination is performed to obtain the positive electrode material, wherein the temperature of the low temperature calcination is 250-400 DEG C, and the time is 8-12 hours. The positive electrode material prepared by the method includes an active material having ageneral molecular formula of LiaNixCoyMnzO2, and a coating layer of lithium pyrophosphate or lithium metaphosphate, residual alkali of the positive electrode material can be reduced, and cycle stability of the positive electrode material is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a lithium ion battery positive electrode material, a lithium ion battery positive electrode material prepared by the method and a battery containing the lithium ion battery positive electrode material. Background technique [0002] With the rapid development of the new energy vehicle industry, the requirements for the mileage and safety of lithium-ion power batteries are gradually increasing. [0003] Among the four main materials of power batteries, the performance of cathode materials plays a key role in the electrochemical performance, safety performance and cost of the entire battery. The current cathode materials mainly include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary cathode materials. [0004] Ternary cathode materials have been widely used due to their advantages of stable structure, high capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCY02E60/10
Inventor 乔齐齐江卫军许鑫培张永航
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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