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Composite positive electrode material of aluminum-titanium double-doped lithium manganate and 523-type ternary material and preparation method of composite positive electrode material

A composite cathode material, lithium manganate technology, applied in the direction of positive electrodes, electrical components, battery electrodes, etc., can solve the problems of poor cycle performance, reduced speed, low safety, etc.

Inactive Publication Date: 2020-10-23
淮安新能源材料技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium manganese oxide, as the cathode material of lithium-ion batteries, has a low theoretical specific capacity (≤148mAh / g), rapid capacity decay, and poor cycle performance; while the 523-type ternary spherical material has high discharge specific capacity and cycle performance Good and other advantages, but due to its low security, it greatly reduces its speed to market

Method used

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  • Composite positive electrode material of aluminum-titanium double-doped lithium manganate and 523-type ternary material and preparation method of composite positive electrode material
  • Composite positive electrode material of aluminum-titanium double-doped lithium manganate and 523-type ternary material and preparation method of composite positive electrode material
  • Composite positive electrode material of aluminum-titanium double-doped lithium manganate and 523-type ternary material and preparation method of composite positive electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of composite material (mass ratio 6:4) of aluminum-titanium double-doped lithium manganate and 523-type ternary material

[0029] 1. Preparation of aluminum-titanium double-doped lithium manganese oxide material: electrolytic manganese dioxide (EMD) and lithium carbonate were weighed into a ball mill tank according to the stoichiometric ratio of 1.03, and then weighed according to the doping amount of aluminum and titanium of 4.0%. Aluminum salt and titanium salt were mixed by dry ball milling at a speed of 300 rad / min for 2 h. After sieving, they were sintered in an air atmosphere in a muffle furnace. The sintering procedure was: Raise the temperature to 830°C, keep it warm for 12 hours, then cool to room temperature with the furnace, and obtain aluminum-titanium double-doped lithium manganate after sieving.

[0030] 2. Preparation of 523-type ternary spherical material: Weigh an appropriate amount of lithium salt, 523 precursor, and zirconia ball milling b...

Embodiment 2

[0033] Preparation of composite material of aluminum-titanium double-doped lithium manganese oxide and 523-type ternary material (mass ratio 7:3)

[0034]1. Preparation of aluminum-titanium double-doped lithium manganese oxide material: electrolytic manganese dioxide (EMD) and lithium carbonate were weighed into a ball mill tank according to the stoichiometric ratio of 1.03, and then weighed according to the aluminum-titanium doping amount of 6.0%. Aluminum salt and titanium salt were mixed by dry ball milling at a speed of 300 rad / min for 2 h. After sieving, they were sintered in an air atmosphere in a muffle furnace. The sintering procedure was: Raise the temperature to 830°C, keep it warm for 12 hours, then cool to room temperature with the furnace, and obtain aluminum-titanium double-doped lithium manganate after sieving.

[0035] 2. Preparation of 523-type ternary spherical material: Weigh an appropriate amount of lithium salt, 523 precursor, and zirconia ball milling bea...

Embodiment 3

[0038] Preparation of composite material (mass ratio 8:2) of aluminum-titanium double-doped lithium manganese oxide and 523-type ternary material

[0039] 1. Preparation of aluminum-titanium double-doped lithium manganese oxide material: electrolytic manganese dioxide (EMD) and lithium carbonate were weighed into a ball mill jar according to the stoichiometric ratio of 1.05, and then weighed according to the doping amount of aluminum-titanium of 4.5%. Aluminum salt and titanium salt were mixed by dry ball milling at a speed of 300 rad / min for 4 h. After sieving, they were sintered in an air atmosphere in a muffle furnace. The sintering procedure was: Raise the temperature to 830°C, keep it warm for 12 hours, then cool to room temperature with the furnace, and obtain aluminum-titanium double-doped lithium manganate after sieving.

[0040] 2. Preparation of the spherical material of the 523-type ternary material: Weigh an appropriate amount of lithium salt, 523 precursor, and zi...

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Abstract

The invention discloses a composite positive electrode material of an aluminum-titanium double-doped lithium manganate and 523-type ternary material. The composite positive electrode material is mainly characterized in that an aluminum-titanium double-doped method is adopted to modify a lithium manganate material to obtain an aluminum-titanium double-doped lithium manganate material with stable cycle performance; and then the 523-type ternary spherical material with good sphericity and high specific capacity is prepared, the two materials are subjected to wet ball milling and mixing to obtainthe composite positive electrode material of the aluminum-titanium double-doped lithium manganate and 523-type ternary material, and the composite positive electrode material is uniform in mixing, relatively high in specific capacity and excellent in cycle performance. According to the composite positive electrode material, the aluminum-titanium double-doped lithium manganate is mixed with the 523-type ternary spherical material, so that the specific capacity and the cycle performance of the composite positive electrode material can be effectively improved, the material cost can be reduced, the high-oxidation-state deterioration condition of the ternary material can be effectively slowed down, and meanwhile, the formation of lithium dendrites is avoided, so that the safety performance of the composite positive electrode material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode material manufacturing, and relates to a composite material of aluminum-titanium double-doped lithium manganate and 523-type ternary material, in particular to an aluminum-titanium double-doped lithium manganate and 523-type Composite cathode material of ternary material and preparation method thereof. Background technique [0002] The development of the new energy industry is bound to usher in a spring, and the lithium-ion battery industry, as an important part of the new energy industry, will also flourish. The key indicators that determine battery capacity and life are mainly positive electrode materials and negative electrode materials. Existing cathode materials mainly include lithium cobaltate, lithium iron phosphate, lithium manganate, ternary cathode materials and lithium-rich manganese-based cathode materials. Lithium manganese oxide, the cathode material of lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 封平净王自强魏奇尹延谋
Owner 淮安新能源材料技术研究院
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