Method for raising lithium manganate production capacity and compacted density of positive electrode in lithium manganate battery

A technology of production capacity, lithium manganate and compaction density, applied in battery electrodes, circuits, electrical components, etc., can solve the problem that the compaction density of the positive electrode of lithium manganate battery is difficult to increase, the reaction between material particles is insufficient, and the material contact is not close. and other problems, to achieve the effect of improving the kinetic conditions of high-temperature solid-phase reaction, meeting market needs, and reducing porosity

Inactive Publication Date: 2012-02-29
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the domestic production methods of lithium manganate are almost all powder sintering, with small bulk specific gravity, low output of a single furnace, insufficient material contact, large porosity, insufficient reaction between material particles, and defective performance. Lithium manganate It is also difficult to increase the compaction density of the positive electrode in the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 2000g of a mixture of manganese dioxide and lithium carbonate with a bulk specific gravity of 1.06 from the lithium manganate production line, add 20g of organic binder hydroxycellulose (abbreviated as CMC), and disperse and mix the organic binder into a solution and the mixture , Weigh 80 grams of the mixed material each time and use 500kg / cm 2 The pressure, the pressing time is 3 seconds, and it is pressed into a block of 30*40*40. The specific gravity of the measured heap is 1.39, so that the output of the kiln is correspondingly increased by 31%. Put the block into the pusher kiln for sintering. The temperature is 840°C, and the sintering time is 11h. After sintering, the agglomerate is crushed and sieved with a 0.045mm sampling sieve. The material under the sieve is lithium manganate product.

[0030] According to the conventional process of making lithium manganate battery, the lithium manganate product is first made into a pole piece, and its compaction dens...

Embodiment 2

[0032] Take 1000g of the mixture of manganese dioxide and lithium carbonate from the lithium manganate production line, add 6g of organic binder hydroxycellulose, make a solution of the organic binder and disperse and mix the mixture, weigh 80 grams each time and mix well The final material is used on the press with 400kg / cm 2 The pressure, the pressing time is 6 seconds, and the long axis of pressing is 50mm. The oval block is 1.34. The mass is put into the pusher kiln for sintering. The sintering temperature is 810°C and the sintering time is 14h. The agglomerate is pulverized and sieved with a 0.045mm analytical sieve, and the under-sieve material is lithium manganate product.

[0033] According to the conventional process of making lithium manganese oxide battery, firstly, the lithium manganate product is made into a pole piece, and its compaction density is measured to be 3.03g / cm 3 , and then continue to make a 053048 aluminum shell effective battery, and test its elect...

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Abstract

A method for raising the lithium manganate production capacity and the compacted density of a positive electrode in a lithium manganate battery. The technological steps contain: adding an organic binder hydroxypropyl-cellulose into a mixture of manganese dioxide and lithium carbonate, uniformly mixing, compacting into a lithium manganate lump, sintering, crushing the sintered lithium manganate lump, and sieving to obtain a lithium manganate product; compacting the lithium manganate product into a pole piece by a routine method, and making the lithium manganate pole piece into a 053048 aluminium shell effect battery by a routine method. By the steps of compacting the mixture into a lump and then sintering, the proportion of the sintered stockpile is raised by 31% than that of a mixture which dose not undergo compacting and sintering steps, the quality of the lithium manganate product is improved, and the porosity is reduced, thus raising the bulk energy density of the battery.

Description

technical field [0001] The invention belongs to the technical field of new energy material preparation, and relates to a method for increasing the production capacity of lithium manganate and the compaction density of positive electrodes in lithium manganate batteries. Background technique [0002] In recent years, due to the global energy crisis, air pollution, greenhouse effect and other reasons, there has been an upsurge in the development of new energy vehicles all over the world. The Chinese government is very determined to develop the new energy vehicle industry, and has issued a series of Encouraging policies, new energy vehicles have become a hot spot in the automotive industry, and power batteries are the "heart" of new energy vehicles, and their research and development and production have become the top priority for the development of new energy vehicles. CMIC experts predict that by 2012, China will have a production capacity of 500,000 new energy vehicles and a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCY02E60/10
Inventor 李华成李肇佳詹海青李普良陈平胡明超张发明王春飞陈南雄张丽云
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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