Modified lithium-rich manganese-based positive electrode material and preparation method thereof

A lithium-rich manganese-based, cathode material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of low discharge capacity, low first Coulomb efficiency, and reduce first irreversible capacity loss, etc., to improve Coulomb efficiency, The effect of complete crystal structure and improved rate performance

Inactive Publication Date: 2017-05-10
TIANNENG SAFT ENERGY JOINT CO
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Problems solved by technology

For example, the patent document whose publication number is CN 101562245 A discloses a method using MnO 2 A method of surface coating the lithium-rich cathode material, which reduces the first irreversible capacity loss of the material and improves the cycle performance of the material at high rates, but the discharge capacity of the modified material is low
The patent document with the publication number CN 102738458 A uses oxides or phosphates of Al, Ce, Mn, Ru, Y, Ni, Co and other elements as the coating layer of lithium-rich manganese-based positive electrode materials. This method improves the first Coulombic efficiency , improve the cycle performance and rate performance, but this modification method reduces the discharge voltage platform of the lithium-rich manganese-based cathode material, resulting in a decrease in the energy density of the lithium-rich cathode material
The patent document with the publication number CN 102694164 A discloses a lithium-rich manganese-based cathode material doped with nitrogen or carbon on the surface. Although this method improves the cycle performance of the lithium-rich manganese-based cathode material, this method does not solve the first Coulombic efficiency. lower question

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  • Modified lithium-rich manganese-based positive electrode material and preparation method thereof

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Embodiment 1

[0025] The lithium-rich manganese precursor Ni x co y mn z (OH) 2 (x:y:z=1:1:4) Pretreatment is carried out in the muffle furnace, the holding temperature is set at 400°C, the heating rate is 2°C / min, the holding time is 6h, the atmosphere is air, and the air flow rate is 10L / min, to obtain the pretreatment precursor;

[0026] Will Li 2 CO 3 , Li 2 RuO 3 , Lithium-rich manganese precursor after step 1 treatment, dopant AlF 3 Mix uniformly according to the molar ratio of 0.55:0.1:1:0.05, the obtained powder is sintered in a muffle furnace, the holding temperature is 750°C, the holding time is 12h, the heating rate is 5°C / min, the atmosphere is air, and the ventilation rate is 15L / min, after sintering, cool with the furnace at a cooling rate of 3°C / min, grind and sieve the sintered product, and obtain the final lithium-rich manganese-based positive electrode material A.

Embodiment 2

[0028] The lithium-rich manganese precursor Ni x co y mn z (OH) 2 (x:y:z=1:1:4) Carry out pretreatment in the muffle furnace, set the holding temperature at 600°C, the heating rate at 3°C / min, the holding time at 3h, the atmosphere is air, and the air flow rate is 15L / min, to obtain the pretreatment precursor;

[0029] Will Li 2 CO 3 , Li 2 RuO 3 , Lithium-rich manganese precursor after step 1 treatment, dopant AlF 3 Mix uniformly according to the molar ratio of 0.6:0.15:1:0.1, the obtained powder is sintered in a muffle furnace, the holding temperature is 850°C, the holding time is 10h, the heating rate is 5°C / min, the atmosphere is air, and the ventilation rate is 15L / min, after sintering, cool with the furnace at a cooling rate of 3°C / min, grind and sieve the sintered product to obtain the final lithium-rich manganese-based positive electrode material B.

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Abstract

The invention discloses a modified lithium-rich manganese-based positive electrode material and a preparation method thereof, and belongs to the technical field of positive electrode materials for lithium-ion batteries. The preparation method comprises the steps of fully mixing a lithium-rich manganese-based precursor, a lithium salt and a doped metal compound, and then burning a mixture to prepare the modified lithium-rich manganese-based positive electrode material; and carrying out pretreatment of heat preservation on a lithium-rich manganese-based precursor at 300-650 DEG C for 2-6 hours before mixing. A pretreatment step of the precursor is added to an existing preparation technology of the lithium-rich manganese-based positive electrode material, a crystal structure of the precursor is more complete and an aluminum element is doped, so that the initial coulomb efficiency of the positive electrode material can be significantly improved and is improved by 15-20% in comparison with that of an un-pretreated material; and the rate capability is also greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a modified lithium-rich manganese-based cathode material and a preparation method thereof. Background technique [0002] The energy issue is a key issue for a country's sustainable development, and seeking and developing alternative secondary energy is an important national policy of our country at present. Lithium-ion battery is a high-energy battery that has developed rapidly in the past ten years. Due to its advantages of high voltage, high specific energy, good cycle performance, and low environmental pollution, it has become a key direction for the development of new energy industries in various countries. The lithium-ion cathode material is an important part of the lithium-ion battery and a key point in the performance of the lithium-ion battery. [0003] In recent years, low-cost, high-capacity lithium-rich manganese-based cathode materials h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/505Y02E60/10
Inventor 许国干李文李靖周敏苏建敏张宁吴敏智余心亮
Owner TIANNENG SAFT ENERGY JOINT CO
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