Preparation method of spinel type lithium manganate with high crystallinity used in lithium ion battery

A lithium ion battery, lithium manganate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of reducing battery high temperature cycle performance, cycle performance and high current working performance, Jahn-Teller structure deformation, sacrificing battery energy Density and other issues, to achieve the effect of improving cycle performance, easy large-scale production, and achieving large-scale production

Inactive Publication Date: 2010-08-18
兰州金里能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, during the long charge-discharge cycle of traditional lithium manganese oxide, especially under high-temperature charge-discharge cycles, the cycle performance of the battery is significantly reduced due to the dissolution of manganese, and the Jahn-Teller structure deformation is prone to occur when the discharge is terminated. These factors Both reduce the high temperature cycle performance, cycle performance and high cur

Method used

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  • Preparation method of spinel type lithium manganate with high crystallinity used in lithium ion battery
  • Preparation method of spinel type lithium manganate with high crystallinity used in lithium ion battery
  • Preparation method of spinel type lithium manganate with high crystallinity used in lithium ion battery

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Embodiment 1

[0032] Embodiment 1 A kind of preparation method for the high crystalline spinel type lithium manganate of lithium ion battery, comprises the following steps:

[0033] (1) Raw material selection: select battery-grade electrolytic manganese oxide with a particle size of 3-25um; battery-grade lithium-containing compounds with an average particle size of ≤8um, with an impurity content of ≤0.5%;

[0034] Wherein: the manganese oxide is trimanganese tetraoxide, and the lithium-containing compound is lithium carbonate.

[0035] (2) After uniformly mixing manganese oxide and lithium-containing compound at a manganese / lithium molar ratio of 1:0.56, ball milling and pressing into block mixture;

[0036] (3) Put the mixture obtained in step (2) into a continuous sintering furnace, and heat it at a constant temperature at 760° C. for 18 hours in an oxygen-containing atmosphere with an oxygen concentration of 30%; After cooling for 20 hours, the product Li can be obtained through classif...

Embodiment 2

[0037] Embodiment 2 A kind of preparation method for the high crystalline spinel type lithium manganate of lithium ion battery, comprises the following steps:

[0038] (1) Raw material selection: select battery-grade electrolytic manganese oxide with a particle size of 3-25um; battery-grade lithium-containing compounds with an average particle size of ≤8um, with an impurity content of ≤0.5%;

[0039] Wherein: manganese oxide is manganese trioxide; lithium-containing compound is lithium carbonate.

[0040] (2) After uniformly mixing manganese oxide and lithium-containing compound at a manganese / lithium molar ratio of 1:0.58, ball milling and pressing into block mixture;

[0041] (3) Put the mixture obtained in step (2) into a continuous sintering furnace, and heat it at a constant temperature at 730° C. for 24 hours in an oxygen-containing atmosphere with an oxygen concentration of 100%; After cooling for 30 hours, the product Li can be obtained through classification inspecti...

Embodiment 3

[0042] Embodiment 3 A kind of preparation method for the high crystalline spinel type lithium manganate of lithium ion battery, comprises the following steps:

[0043] (1) Raw material selection: select battery-grade electrolytic manganese oxide with a particle size of 3-25um; battery-grade lithium-containing compounds with an average particle size of ≤8um, with an impurity content of ≤0.5%;

[0044] Wherein: the manganese oxide is manganese dioxide, and the lithium-containing compound is lithium hydroxide.

[0045] (2) After uniformly mixing manganese oxide and lithium-containing compound at a manganese / lithium molar ratio of 1:0.57, ball milling and pressing into a block mixture;

[0046](3) Put the mixture obtained in step (2) into a continuous sintering furnace, and heat it at a constant temperature at 810°C for 12h in an oxygen-containing atmosphere with an oxygen concentration of 60%; After cooling for 10 hours, the product Li can be obtained through classification insp...

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Abstract

The invention relates to a preparation method of spinel type lithium manganate with high crystallinity used in the lithium ion battery, comprising the following steps: (1) selecting the raw materials: selecting the battery grade electrolytic manganese oxide with the grain size of 3-25 mum and the battery grade Li-containing compound with the average grain size less than or equal to 8 mum and the impurity content less than or equal to 0.5%; (2) mixing the manganese oxide and the Li-containing compound evenly according to the Mn/Li mole ration of 1:0.56-0.58, ball milling and pressing into block mixture; (3) adding the mixture into the continuous sintering furnace, and heating under 730-810 DEG C with constant temperature for 12-24 h in the oxygen containing atmosphere with the oxygen content larger or equal to 30%; after the sintering reaction, cooling under the normal temperature in the continuous sintering furnace for 10-30 h, examining in grade and obtaining the product of Li1+xMn2O4, wherein 0<x<0.2. The method of the invention has simple process, and the crystallinity and the circulating performance of the product are improved with the enhancement of the oxygen content in the sintering atmosphere.

Description

technical field [0001] The invention relates to a preparation method of spinel lithium manganate, in particular to a preparation method of high-crystal spinel lithium manganate used in lithium ion batteries. Background technique [0002] Due to the advantages of high energy density, long cycle life, less pollution, no memory effect, small size, and light weight, lithium-ion batteries are widely used in small mobile electronic products such as mobile phones, notebook computers, and power tools. The battery with the most development potential in the fields of bicycles and electric vehicles. [0003] Lithium cobalt oxide (LiCoO 2 ), spinel lithium manganese oxide LiMn 2 o 4 , lithium nickel cobalt manganese oxide Li (Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 . Due to the scarcity of cobalt resources, high price, and the impact of its toxicity on the environment, coupled with the low thermal stability of lithium cobalt oxide during charge and discharge cycles, the development potential ...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/505
CPCY02E60/122Y02E60/10
Inventor 寿焕根曾耀武衡凯彭方超唐俊
Owner 兰州金里能源科技有限公司
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