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Lithium-rich manganese-based positive electrode material and preparation method and application thereof

A cathode material, lithium-rich manganese-based technology, applied in the field of lithium-rich manganese-based cathode materials and its preparation, can solve the problems of capacity fading, low initial efficiency, etc., and achieve the effect of improved cycle performance, high specific capacity, and good rate performance

Active Publication Date: 2019-11-05
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a lithium-rich manganese-based positive electrode material to solve the problems of rapid capacity decay and low initial efficiency.

Method used

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  • Lithium-rich manganese-based positive electrode material and preparation method and application thereof
  • Lithium-rich manganese-based positive electrode material and preparation method and application thereof
  • Lithium-rich manganese-based positive electrode material and preparation method and application thereof

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Embodiment 1

[0067] (1) Weigh 1mol of Mn 0.6 Ni 0.2 co 0.2 CO 3 and transferred to a mortar and ground until the D50 particle size is not greater than 8 μm, and the ground precursor material is subjected to the first calcination treatment in an oxygen atmosphere furnace at 500°C to obtain the first calcination product, wherein the calcination time is 8h, oxygen The concentration is 20v%; (2) the first calcined product is mixed with 1.55mol of LiOH·H 2 O mixed and ground for 1 h, and then the second calcination treatment was carried out in an oxygen atmosphere furnace at 800 ° C to obtain the positive electrode preparation material 0.5 Li 2 MnO 3 -0.5LiMn 0.6 Ni 0.2 co 0.2 o 2 , wherein the time of the second calcination treatment is 12h, the oxygen concentration is 20v%, and the D50 particle diameter of the first calcination product and the lithium salt after grinding is not more than 8 μm; (3) Weigh 5g of the positive electrode preparation material and add a concentration of 0.1m...

Embodiment 2

[0069] (1) Weigh 1mol of Mn 0.6 Ni 0.2 co 0.2 CO 3 and transferred to a mortar and ground until the D50 particle size is not greater than 8 μm, and the ground precursor material is subjected to the first calcination treatment in an oxygen atmosphere furnace at 500°C to obtain the first calcination product, wherein the calcination time is 8h, oxygen The concentration is 20v%; (2) the first calcined product is mixed with 1.5mol of LiOH·H 2 O mixed and ground for 1 h, and then the second calcination treatment was carried out in an oxygen atmosphere furnace at 800 ° C to obtain a positive electrode preparation material of 0.45 Li 2 MnO 3 -0.55LiMn 0.6 Ni 0.2 co 0.2 o 2 , wherein the time of the second calcination treatment is 12h, the oxygen concentration is 20v%, and the D50 particle diameter of the first calcination product and the lithium salt after grinding is not more than 8 μm; (3) Weigh 5g of the positive electrode preparation material and add a concentration of 0....

Embodiment 3

[0071] (1) Weigh 1mol of Mn 0.6 Ni 0.2 co 0.2 CO 3 and transferred to a mortar and ground until the D50 particle size is not greater than 8 μm, and the ground precursor material is subjected to the first calcination treatment in an oxygen atmosphere furnace at 500°C to obtain the first calcination product, wherein the calcination time is 8h, oxygen The concentration is 20v%; (2) the first calcined product is mixed with 1.6mol of LiOH·H 2 O mixed and ground for 1 h, and then the second calcination treatment was carried out in an oxygen atmosphere furnace at 800 ° C to obtain the positive electrode preparation material 0.55 Li 2 MnO 3 -0.45LiMn 0.6 Ni 0.2 co 0.2 o 2 , wherein the time of the second calcination treatment is 12h, the oxygen concentration is 20v%, and the D50 particle diameter of the first calcination product and the lithium salt after grinding is not more than 8 μm; (3) Weigh 5g of the positive electrode preparation material and add a concentration of 0.1...

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Abstract

The invention provides a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The general formula of the lithium-rich manganese-based positive electrode material is xLi2MnO<3-y>LiMn<[alpha]>M<1[beta]>O<(2+delta)-z>MnM<2[gamma]>O<(2 + lambda)>, wherein x+y+z=1, z>0, 0<=alpha<1, 0<beta<= 1, 0<=gamma<=1, 0<=delta<= 1, and 0<=lambda<=1, and M1 andM2 are each independently at least one selected from the group consisting of Sc, Ti, V, Cr, Fe, Co, Ni, Cu, Zn, Mg, Sr, Ba, Cd, Al, Ga, B, Zr, Y and Nb. The lithium-rich manganese-based positive electrode material is stable in structure, low in cost, higher in specific capacity and good in rate capability and cycle performance; the initial discharge capacity is not lower than 310 mAh / g, and the first efficiency is not lower than 90%; and the material can be widely applied to the field of high-energy density lithium batteries.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. Background technique [0002] LiCoO 2 It is one of the most mature cathode materials for lithium-ion batteries at present, but it has problems such as poor safety, overcharge and high cost, and it is made of LiNiO 2 The prepared cathode materials also have problems such as poor stability, poor safety, and difficult synthesis; while manganese-based cathode materials, such as LiMnO 2 , although the cost is low, the source is wide and the theoretical capacity is high, but it shows a thermodynamically unstable crystal structure during the charge-discharge process, resulting in faster capacity decay during the charge-discharge process; manganese-based LiMn 2 o 4 Cathode materials are prone to crystal transformation, manganese ion dissolution, and ginger-Taylor effect during charge a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/052
CPCH01M4/485H01M4/505H01M4/525H01M10/052H01M2220/20Y02E60/10
Inventor 拉杰什·麦加朱金鑫普拉杰什·PP王鹏飞马忠龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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