Method for preparing nickel-cobalt lithium manganate monocrystal cathode material by doping strontium

A technology of nickel cobalt lithium manganate and cathode material, applied in the direction of polycrystalline material growth, single crystal growth, single crystal growth, etc., can solve the problems of poor electrical properties such as specific capacity and cycle performance, and unstable secondary particles, etc. Achieve high specific capacity, facilitate lithium ion transport, and reduce side reactions

Inactive Publication Date: 2020-03-06
四川新锂想能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: the secondary particles of traditional ternary positive electrode materials are unstable under high voltage conditions, and the electrical properties such as specific capacity and cycle performance of positive electrode materials under high voltage conditions are relatively poor. The present invention provides A method for preparing nickel-cobalt lithium manganese oxide single crystal cathode material by doping strontium to solve the above problems

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  • Method for preparing nickel-cobalt lithium manganate monocrystal cathode material by doping strontium
  • Method for preparing nickel-cobalt lithium manganate monocrystal cathode material by doping strontium
  • Method for preparing nickel-cobalt lithium manganate monocrystal cathode material by doping strontium

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Embodiment 1

[0034] This embodiment provides a method for preparing a nickel cobalt lithium manganate single crystal cathode material by doping strontium, and the specific steps are as follows:

[0035] Step 1. Put Ni 0.5 Co 0.2 Mn 0.3 (OH) 2 , Lithium carbonate and co-solvent are added to the high-mixer, first mix for 200s at a low speed of 200rpm, and then mix for 900s at a high speed of 900rpm; at the end of the mixing, a black mixed powder is obtained.

[0036] Step 2, the mixed powder of step 1 is calcined in a box furnace: under the condition of oxygen concentration of 40%, the temperature is increased from room temperature to 970°C at a rate of 2°C / min, and the temperature is kept at 970°C for 14h . After taking it out, grinding and passing through a 300-mesh sieve to obtain a primary calcined product.

[0037] Step 3: Put the primary calcined product obtained in step 2 into a box furnace, heat it from room temperature to 880°C at a rate of 2°C / min, keep it at 880°C for 5 hours and then c...

Embodiment 2

[0041] This embodiment provides a method for preparing a nickel cobalt lithium manganate single crystal cathode material by doping strontium, and the specific steps are as follows:

[0042] Step 1. Put Ni 0.5 Co 0.2 Mn 0.3 (OH) 2 , Lithium carbonate and co-solvent are added to the high-mixer, first mix for 200s at a low speed of 200rpm, and then mix for 900s at a high speed of 900rpm; at the end of the mixing, a black mixed powder is obtained.

[0043] Step 2, the mixed powder of step 1 is calcined in a box furnace: under the condition of oxygen concentration of 40%, the temperature is increased from room temperature to 970°C at a rate of 2°C / min, and the temperature is kept at 970°C for 14h . After taking it out, grinding and passing through a 300-mesh sieve to obtain a primary calcined product.

[0044] Step 3: Put the primary calcined product obtained in step 2 into a box furnace, heat it from room temperature to 880°C at a rate of 2°C / min, keep it at 880°C for 5 hours and then c...

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Abstract

The invention discloses a method for preparing a nickel-cobalt lithium manganate monocrystal cathode material by doping strontium, comprising the following steps: uniformly mixing ternary cathode material precursor powders, lithium carbonate powders, and a fluxing agent in proportion to obtain mixed powders; calcining the mixed powder for the first time at a temperature of 910 to 970 degrees centigrade to obtain a primary calcined product; calcining the primary powders at a temperature of 780 to 880 degrees centigrade to obtain a nickel-cobalt lithium manganate cathode material, wherein the ternary cathode material precursor is Ni0.5Co0.2Mn0.3(OH)2, and the fluxing agent is strontium hydroxide. The cathode material provided by the present invention effectively improves the electrochemicalperformance of the ternary material under a high voltage by improving the structural integrity and surface properties of the cathode material, and exhibits high specific capacity and good cycle performance, can effectively improve high-temperature cycling and gas production of polycrystalline materials.

Description

Technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing a nickel-cobalt-manganese lithium monocrystalline positive electrode material by doping strontium. Background technique [0002] Lithium-ion batteries have accumulated fairly mature technology after decades of application in portable electronic and electrical equipment due to their lightweight and portable design, high energy density, and reusability. At present, the cathode materials that have been successfully applied on a large scale on the market mainly include layered rock salt structure lithium cobalt oxide (LiCoO 2 ) Material, olivine structure of lithium iron phosphate (LiFePO 4 ) Materials and cubic spinel structure of lithium manganate (LiMn 2 O 4 )material. However, with the development of the power battery market, the above-mentioned materials cannot be the best choice for new energy vehicle power modules due to the constraints of the material's ow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C30B9/12C30B29/22
CPCC30B9/12C30B29/22H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈伟黄小丽岳波王俊安李延俊刘晶晶
Owner 四川新锂想能源科技有限责任公司
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