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A kind of lithium ion battery manganese-rich cathode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of fast material capacity decay and material discharge capacity reduction, so as to improve rate performance, suppress unfavorable phase transitions, and enhance structural stability The effect of stability and interface stability

Active Publication Date: 2019-10-25
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Professor Manthiram's research group at the University of Texas at Austin published a method of coating with metal oxide or lithium-intercalated oxide in the Journal of Materials Chemistry. Adjusting the coating amount can increase the first-time cycle efficiency to 100%, but the material is in the cycle. The capacity decays faster in the process
The research group of Professor Sun of Hanyang University published in the Journal of Power Sources that the cycle stability of lithium-rich manganese-based materials is improved after doping with Al, but the discharge capacity of the materials is reduced

Method used

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  • A kind of lithium ion battery manganese-rich cathode material and preparation method thereof
  • A kind of lithium ion battery manganese-rich cathode material and preparation method thereof
  • A kind of lithium ion battery manganese-rich cathode material and preparation method thereof

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Embodiment 1

[0047] A lithium-rich manganese-based positive electrode material with Ti gradient doping. The initial metal ion ratio in the material is Mn:Ni:Co =0.6750:0.1625:0.1625, and the content of the doping element Ti increases from the particle core to the particle surface, changing The rule is 0~0.02. The average composition of the resulting material is Li[Li 0.2 mn 0.53 Ni 0.13 co 0.13 Ti 0.01 ]O 2 , with an average particle size of about 12.0 μm and a tap density of about 2.6 g / cm 3 .

[0048] The specific preparation method is as follows:

[0049] Prepare a 1.5 mol / L mixed solution with a molar ratio of manganese carbonate, nickel carbonate and cobalt carbonate of 0.6750:0.1625:0.1625 and record it as solution (1) and put it into sub-tank R1. Prepare the solution containing titanyl sulfate stabilizer as solution (2) and put it into sub-tank R2, and prepare a 2mol / L solution of titanyl sulfate as solution (3) and put it into sub-tank R3. The solution of R3 sub-tank is ad...

Embodiment 2

[0052] A lithium-rich manganese-based positive electrode material with Ti gradient doping. The initial metal ion ratio in the material is Mn:Ni:Co =0.6750:0.1625:0.1625, and the content of the doping element Ti increases from the particle core to the particle surface, changing The rule is 0~0.02. The average composition of the resulting material is Li[Li 0.2 mn 0.53 Ni 0.13 co 0.13 Ti 0.01 ]O 2 , with an average particle size of about 6.0 μm and a tap density of about 2.0 g / cm 3 .

[0053] The specific preparation method is as follows:

[0054] Prepare a 1.5 mol / L mixed solution with a molar ratio of manganese carbonate, nickel carbonate and cobalt carbonate of 0.6750:0.1625:0.1625 and record it as solution (1) and put it into sub-tank R1. Prepare the solution containing titanyl sulfate stabilizer as solution (2) and put it into sub-tank R2, and prepare a 2mol / L solution of titanyl sulfate as solution (3) and put it into sub-tank R3. Add the solution of the sub-tank o...

Embodiment 3

[0057] A lithium-rich manganese-based positive electrode material with Ti gradient doping. The initial metal ion ratio in the material is Mn:Ni:Co =0.70:0.15:0.15, and the content of the doping element Ti increases from the particle core to the particle surface, changing The rule is 0~0.02. The average composition of the resulting material is Li[Li 0.2 mn 0.55 Ni 0.12 co 0.12 Ti 0.01 ]O 2 , the average particle size is about 13.0 μm, and the tap density is about 2.5g / cm 3 .

[0058] The specific preparation method is as follows:

[0059] Prepare a 1.5 mol / L mixed solution with a molar ratio of manganese carbonate, nickel carbonate and cobalt carbonate of 0.70:0.15:0.15 and record it as solution (1) and put it into sub-tank R1. Prepare the solution containing titanyl sulfate stabilizer as solution (2) and put it into sub-tank R2, and prepare a 2mol / L solution of titanyl sulfate as solution (3) and put it into sub-tank R3. The solution of R3 sub-tank is added to R2 with...

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Abstract

The invention discloses a lithium ion battery manganese-enriched anode material and a preparation method thereof. The average composition formula of the material is Li[LideltaMnxNiyCozM1-x-y-z]O2, delta is not smaller than 0.1 and not larger than 0.3, x is not smaller than 0.4 and not larger than 0.8, y is not smaller than 0 and not larger than 0.2, z is not smaller than 0 and not larger than 0.2,M is one or more of Nb, Sm, La, Mo, Ca, Y, W, V, Mg, Fe, Zr, Ti, Zn, B, Al and Cr, and the content of the doping element M is continuously increased from the particle core to the surface. According to the precipitating rules of different elements under a carbonate system, doping elements are optimally distributed, in the precursor preparing process, it is ensured that the internal crystal structure of the material is optimized by adjusting the content of the doping elements at different precipitating stages, the problem of voltage drop of an existing lithium-enriched manganese-based materialis solved, and the rate capability is improved; the process is continuous and controllable, operation is easy, the cost is low and the material is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a manganese-rich cathode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Layered lithium-rich manganese-based solid solution material xLi 2 MnO 3• (1-x)LiMO 2 (0<x<1, M=Ni, Co, Mn and other transition metals and their combinations) have the advantages of high capacity (higher than 250mAh / g), low cost, non-toxic, safe, etc., which can meet the needs of lithium batteries in small electronic products It will become one of the mainstream directions for the development of cathode materials for the latest generation of power lithium batteries in the future. [0003] Although the layered lithium-rich manganese-based solid solution material has a high discharge specific capacity, the disadvantages of the material are as prominent as the advantages, mainly in: 1. The first charge to 4.5V or above, accompanied by Li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 王竞鹏冯海兰刘亚飞陈彦彬张学全
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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