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High-performance doped lithium manganate positive electrode material and preparation method thereof

A type of lithium manganate and cathode material technology, applied in the field of high-performance doped lithium manganate cathode material and its preparation, can solve the problems of high self-discharge, poor compaction, poor high temperature performance, etc., and achieve the tap density Improved, simple operation, fewer steps

Inactive Publication Date: 2019-04-02
山西北斗星新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing lithium manganese oxide lithium ion battery cathode material is usually based on MnO 2 / Li 2 CO 3 70-90%+LiOH 10-30% or MnO 2 / Li 2 CO 3 As a raw material, according to the formula of lithium and manganese molar ratio (0.8-1.2): 2, there are disadvantages such as high self-discharge, poor compaction, and poor high-temperature performance

Method used

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  • High-performance doped lithium manganate positive electrode material and preparation method thereof
  • High-performance doped lithium manganate positive electrode material and preparation method thereof
  • High-performance doped lithium manganate positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0025] A high-performance doped lithium manganate cathode material, its chemical formula is Li 1.1 mn 1.8 Al 0.1 Mg 0.1 f 0.1 o 3.9 .

[0026] The preparation method of the cathode material comprises the following steps:

[0027] (1) Weigh MnO in proportion 2 , Li 2 CO 3 And the source compound of doping elements, Li source is LiF, Al source is Al(OH) 3 , Mg source is Mg(OH) 2 , F source is LiF;

[0028] (2) Ball milling and mixing for 0.5h;

[0029] (3) Roasting at 900°C for 10 hours;

[0030] (4) Slowly cool down in the natural state;

[0031] (5) Screening, sampling inspection, and packaging.

Embodiment 2

[0033] A high-performance doped lithium manganate cathode material, its chemical formula is Li 1.12 mn 1.87 Al 0.12 Mg 0.01 f 0.12 o 3. 88 . Its preparation method is similar to Example 1, ball milling and mixing for 3 hours, calcination at 700°C for 10 hours, and other operating conditions are the same as Example 1.

Embodiment 3

[0035] A high-performance doped lithium manganate cathode material, its chemical formula is Li 1.11 mn 1.84 Al 0.11 Mg 0.05 f 0.11 o 3. 84 . Its preparation method is similar to Example 1, ball milling and mixing for 2 hours, calcination at 800°C for 2 hours, and other operating conditions are the same as Example 1.

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Abstract

The invention provides a high-performance doped lithium manganate positive electrode material. At least one of the following elements of Nb, F and B are doped in lithium manganate, wherein molar ratios of Nb, F and B to the lithium manganate are 0.002 to 0.005, 0.05 to 0.15 and 0.001 to 0.005. During production, the preparation method comprises the following operation steps of weighing MnO2, Li2CO3 and a doped element source compound proportionally; carrying out ball milling and mixing for 0.5 to 3 hours; roasting at 700 to 900 DEG C for 10 to 30 hours; introducing excess air, and then slowlycooling; and performing screening, sampling inspection and packaging. Compared with an undoped lithium manganate positive material, the tap density of the doped lithium manganate positive electrode material provided by the invention is improved by at least 0.3 to 0.5 gram per cubic centimeter, after a lithium battery is assembled, the self-discharge problem is remarkably improved; and after high-temperature circulation at 1 C and 55 DEG C for 300 times, the capacity retention rate is still more than 85%.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a high-performance doped lithium manganate cathode material and a preparation method thereof. Background technique [0002] Lithium manganese oxide is one of the very promising lithium ion cathode materials. Compared with traditional cathode materials such as lithium cobalt oxide, it has the advantages of abundant resources, low cost, no pollution, good safety, and good rate performance. It is an ideal power source. However, its poor cycle performance and electrochemical stability greatly limit its industrialization. Lithium manganate mainly includes spinel-type lithium manganate and layered structure lithium manganate, among which spinel-type lithium manganate has a stable structure and is easy to realize industrial production. Today's market products all have this structure. Spinel-type lithium manganese oxide belongs to the cubic crystal system, Fd3m space group, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62H01M10/0525
CPCH01M4/505H01M4/62H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 蒋国胜江晖赵旭红李艳阳李丽娟
Owner 山西北斗星新材料股份有限公司
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