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Preparation method of low-cobalt single-crystal positive electrode material

A positive electrode material and single crystal technology, which is applied in the field of preparation of low-cobalt single crystal positive electrode materials, can solve the problems of positive electrode material crystal structure, valence state defects, affecting cycle performance, discharge capacity, crystal structure deterioration, etc., to achieve suppression of high temperature Oxygen loss reaction, short preparation cycle, and the effect of improving the crystal structure

Pending Publication Date: 2021-11-26
宁夏汉尧石墨烯储能材料科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation process of low-cobalt cathode materials, nickel is difficult to convert from divalent to trivalent, and is unstable at high temperature, prone to decomposition, etc. It is difficult to roast at a higher temperature, which affects production efficiency
And because the occurrence of oxygen loss reaction in the process of solid-state high-temperature roasting can easily lead to deterioration of the crystal structure, it is difficult to effectively suppress the oxygen loss reaction at present, so that there are certain defects in the crystal structure and valence state of the positive electrode material, which affects the cycle performance and discharge capacity. Etc performance

Method used

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  • Preparation method of low-cobalt single-crystal positive electrode material
  • Preparation method of low-cobalt single-crystal positive electrode material
  • Preparation method of low-cobalt single-crystal positive electrode material

Examples

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preparation example Construction

[0033] The first aspect of the present invention provides a method for preparing a low-cobalt single crystal positive electrode material, comprising:

[0034]The nickel-cobalt-manganese precursor, the oxidizing lithium salt, and the additive are mixed together and roasted once to obtain an intermediate product modified by the oxidizing lithium salt.

[0035] In one embodiment, the molar ratio of the lithium moles in the oxidative lithium salt of the present invention to the total moles of nickel, cobalt, and manganese in the nickel-cobalt-manganese precursor is (1.02-1.3): 1, for example There are 1.02:1, 1.06:1, 1.1:1, 1.2:1, 1.3:1.

[0036] The oxidizing lithium salt is a lithium salt with a high-valence element, and has the ability to obtain electrons. The anion in the oxidizing lithium salt provided by the invention contains a high-valence element, for example, lithium perchlorate (LiClO 4 ), lithium permanganate (LiMnO 4 ·3H 2 O), lithium peroxide (Li 2 o 2 ), lithiu...

Embodiment 1

[0049] This example provides a preparation method of a low-cobalt single crystal positive electrode material, including: nickel-cobalt-manganese precursor Ni 0.6 co 0.02 mn 0.38 (OH) 2 , the oxidative lithium salt lithium thiosulfate mixed (the molar ratio of the lithium in the oxidative lithium salt to the total molar number of nickel, cobalt, and manganese in the nickel-cobalt-manganese precursor is 1.06:1), adding a percentage of nickel-cobalt 0.2 wt% MgCO in total weight of manganese precursor and oxidizing lithium salt 3 , roasted at 1000°C for 10h, after crushing, the oxidized lithium salt modified intermediate product was obtained, mixed with ZrO accounting for 0.2wt% of the weight of the oxidized lithium salt modified intermediate product, sintered at 700°C for 6h, crushed, sieved and demagnetized , to get LiNi 0.60 co 0.02 mn 0.38 o 2 Single crystal low cobalt single crystal cathode material.

[0050] This example also provides the low-cobalt single crystal po...

Embodiment 2

[0052] This example provides a method for preparing a low-cobalt single crystal positive electrode material. The preparation method is the same as in Example 1, except that the precursor is Ni 0.60 mn 0.40 (OH) 2 .

[0053] This example also provides the low-cobalt single crystal positive electrode material prepared by the above-mentioned preparation method.

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Abstract

The invention belongs to the field of batteries and relates to a preparation method of a low-cobalt single-crystal positive electrode material. The preparation method comprises the following steps of: mixing a nickel-cobalt-manganese precursor, an oxidizing lithium salt and an additive I; and performing primary roasting to obtain the low-cobalt single-crystal positive electrode material. The low-cobalt and cobalt-free positive electrode material is used as a matrix, oxygen is obtained by oxidative decomposition of the lithium salt, on one hand, a lithium source is provided, and on the other hand, positive ion mixing and high-temperature oxygen loss reaction of the positive electrode material are effectively inhibited; through bulk phase doping and surface coating, the inhibition of change of a crystal structure and reduction of side reaction of an electrolyte and the material are benefited, so that the prepared low-cobalt and cobalt-free low-cobalt single-crystal positive electrode material is good in crystal structure and free of chemical valence defects, has the characteristics of low preparation cost, simple process and short preparation period, can be applied to a lithium ion battery, and improves physical and chemical properties and electrical properties.

Description

technical field [0001] The invention relates to the field of batteries, and more specifically, the invention relates to a method for preparing a low-cobalt single crystal positive electrode material. Background technique [0002] As a rechargeable secondary battery, lithium-ion batteries mainly rely on the deintercalation of lithium ions between the positive and negative electrodes to work. Lithium-ion batteries have the advantages of high working voltage, long cycle life, large specific capacity, good safety performance, small self-discharge, and no memory effect. [0003] At present, the commercial lithium-ion battery cathode materials mainly include ternary cathode materials with layered structure, lithium-rich manganese-based materials, lithium manganese oxide and lithium iron phosphate, etc. Among them, nickel-cobalt lithium manganese oxide ternary cathode materials are due to their high energy density. It has been favored by people. In recent years, as the global elec...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M4/485H01M10/0525H01M2004/028Y02E60/10
Inventor 梁正孙旭王浩陆和杰李海强卢瑶郭晓旭孙全胜李永红吴平
Owner 宁夏汉尧石墨烯储能材料科技有限公司
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