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High-capacity and long-cycle nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

A positive electrode material and long-cycle technology, applied in electrical components, battery electrodes, electrochemical generators, etc., can solve the problem that the ternary nickel-cobalt-manganese positive electrode material cannot take into account the best capacity and cycle performance at the same time, and achieve good cycle performance , Improve crystallinity, increase the effect of material capacity

Active Publication Date: 2020-11-20
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a high-capacity, long-cycle nickel-cobalt-manganese ternary positive electrode material and its preparation method to solve the problem that the ternary nickel-cobalt-manganese positive electrode material mentioned in the above background technology cannot simultaneously take into account better capacity and cycle performance

Method used

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  • High-capacity and long-cycle nickel-cobalt-manganese ternary positive electrode material and preparation method thereof
  • High-capacity and long-cycle nickel-cobalt-manganese ternary positive electrode material and preparation method thereof
  • High-capacity and long-cycle nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0035] A kind of high capacity of the present invention, long cycle nickel-cobalt-manganese ternary cathode material (LiNi 0.52 co 0.20 mn 0.28 o 2 ), the grain size is 255.1nm, the residual stress is 0.220 after X-ray diffraction test and refinement, and the D50 of the ternary cathode material is 9.4μm.

[0036] The preparation method of the high-capacity, long-cycle ternary nickel-cobalt-manganese cathode material of this embodiment is as follows:

[0037] (1) According to the ratio of nickel-cobalt-manganese precursor (D50 is 9.5μm) and lithium metal in lithium carbonate as 1:1.04, weigh 4.8kg of ternary precursor Ni 0.52 co 0.20 mn 0.28 (OH) 2 With 2.2kg lithium carbonate;

[0038] (2) Add the material weighed in step (1) into a small-scale high-speed mixer, first mix the materials at a speed of 500 rpm for 5 minutes, and then mix the materials at a speed of 1000 rpm for 15 minutes;

[0039] (3) Carry out insulation and high-temperature sintering with the mixture o...

Embodiment 2

[0042]A kind of high capacity of the present invention, long cycle ternary cathode material (LiNi 0.52 co 0.20 mn 0.28 o 2 ), the grain size of the ternary cathode material is 282nm, the residual stress after X-ray diffraction test and refinement is 0.229, and the D50 of the ternary cathode material is 9.6μm.

[0043] The preparation method of this example is basically the same as Example 1, the only difference is that the high-temperature sintering temperature of the second stage of step (3) is different. The sintering procedure of step (3) of this example is: room temperature→500°C / 4h→ 700°C / 2h→890°C / 6h→880°C / 8h.

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Abstract

The invention discloses a high-capacity and long-cycle nickel-cobalt-manganese ternary positive electrode material. The grain size of the material is 200-300nm; and the residual stress of the ternarypositive electrode material is 0.15-0.3. The preparation method comprises the following steps: mixing the ternary positive electrode material precursor with a lithium source according to a stoichiometric ratio; performing first-stage sintering and second-stage sintering on the mixture, wherein the sintering temperature of the first stage is 5-20 DEG C higher than that of the second stage; and cooling and sieving the sintered material to obtain the high-capacity and long-cycle nickel-cobalt-manganese ternary positive electrode material. The grain size of the ternary positive electrode materialis 200-300nm, the residual stress of the ternary positive electrode material is 0.15-0.3, and the ternary positive electrode material with the residual stress within the range can ensure that the battery has better capacity and cycle performance at the same time.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a high-capacity, long-cycle nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are playing an increasingly important role in our daily lives. From 3C digital products to electric vehicles, they provide great convenience for our lives. Developing batteries with lower cost, higher energy density and longer cycle life is the pursuit of the entire new energy industry. [0003] Nickel-cobalt-manganese ternary cathode material is a new type of high-energy-density lithium-ion battery material, which has the advantages of low raw material cost, high compaction density, and high energy density. Generally, in the process of preparing the nickel-cobalt-manganese ternary positive electrode material, its grain size needs to be controlled, and the gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 谢炉谭欣欣李艳
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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