Lithium cell anode material lithium manganate preparing method

A material lithium manganate, lithium-ion battery technology, applied in battery electrodes, chemical instruments and methods, manganate/permanganate, etc., can solve the problem of wide particle size distribution, affecting material battery performance, and uneven composition etc. to achieve excellent electrochemical performance, improved cycle stability, and narrow particle size distribution

Inactive Publication Date: 2006-03-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this solid-phase synthesis method is that the process is simple, but there are also obvious defects: the composition of the synthetic material is not uniform, the particle size distribution is wide and the shape is irregular, which affects the battery performance of the material

Method used

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  • Lithium cell anode material lithium manganate preparing method
  • Lithium cell anode material lithium manganate preparing method
  • Lithium cell anode material lithium manganate preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 2 grams of polyvinyl alcohol in 100ml of water, add 4.279 grams of LiOH·H 2 O to dissolve it and add 17.388 g of MnO with stirring 2 (Analysis of pure commercial chemical reagents, prepared by electrolysis, the same below), after stirring for another 2 hours, the temperature was raised to 80°C to evaporate the water, and the granulation was stirred and granulated during this process, and the stirring was stopped after the water was evaporated quickly, and placed in 120 Cure in an oven for 6 hours. Put the obtained gel in an alumina crucible, put it into a high-temperature resistance furnace, raise it to 400°C at 10°C / min, keep the temperature constant for 0.5 hours, then raise it to 800°C at 5°C / min, keep the temperature constant for 12 hours, and then follow the furnace Cool to obtain lithium manganate cathode material. The positive electrode material and the lithium counter electrode were assembled into a button cell. The first discharge specific capacity ...

Embodiment 2

[0026] Dissolve 8 grams of polyethylene glycol in 80ml of water, add 3.695 grams of Li 2 CO 3 To dissolve it, add 17.388 g of MnO with stirring 2 After stirring for another 4 hours, the temperature was raised to 70°C to evaporate the water. During this process, the mixture was stirred and granulated, and the stirring was stopped after the water was quickly evaporated, and then placed in an oven at 120°C for 3 hours to solidify. Put the obtained gel in an alumina crucible, put it into a high-temperature resistance furnace, raise it to 400°C at 5°C / min, keep the temperature constant for 0.5 hours, then rise to 700°C at 5°C / min, keep the temperature constant for 12 hours, and then follow the furnace Cool to obtain lithium manganate cathode material. The positive electrode material and the lithium counter electrode were assembled into a button cell. The first discharge specific capacity of the battery was measured to be 120.6mAh / g, and the capacity retention rate after 100 cycl...

Embodiment 3

[0028] Dissolve 4 grams of polyacrylamide in 1000ml of water, add 7.240 grams of LiNO 3 To dissolve it, add 17.388 g of MnO with stirring 2 After stirring for another 4 hours, the temperature was raised to 80°C to evaporate the water. During this process, the mixture was continuously stirred and granulated, and the stirring was stopped after the water was quickly evaporated, and then placed in a 150°C oven for curing for 4 hours. Put the obtained gel in an alumina crucible, put it into a high-temperature resistance furnace, raise it to 450°C at 10°C / min, keep the temperature constant for 0.5 hours, then raise it to 800°C at 5°C / min, keep the temperature constant for 12 hours, and then follow the furnace Cool to obtain lithium manganate cathode material. The positive electrode material and the lithium counter electrode were assembled into a button cell. The first discharge specific capacity of the battery was measured to be 126.2mAh / g, and the capacity retention rate after 10...

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Abstract

This method provides a preparation method for lithium manganate powder which is used as anode material of lithium ion cell. This method includes: first, use a water soluble macromolecule polymer as dispersant/gelatinizer to prepare 0.2~20g/100ml concentration aqueous solution which is used as solvent in the next step; then add water soluble lithium ion compound to the solvent to acquire 0.05~2 mol/L lithium-concentration lithium solution; next, add solid MnO2 powder in mol ratio of (0.8~1.2) ~2 into the obtained lithium solution agitating meanwhile, then evaporate water to get gelinite, in the end, roast the gelinite under 300~850 deg.C for 0.7~28 hours. Advantages: homogeneous grains, high first-charge-discharge efficiency, high reversible-ratio capacity and excellent cycle performance.

Description

【Technical field】 [0001] The invention relates to a lithium ion secondary battery, in particular to a preparation method of lithium manganate, a cathode material of the lithium ion secondary battery. 【Background technique】 [0002] The cathode material of commercial lithium-ion batteries is mainly lithium cobalt oxide (LiCoO 2 ), due to the scarcity of cobalt resources, high price and the impact of its toxicity on the environment, its development potential is limited. Another cathode material lithium nickel oxide (LiNiO 2 ) Although the price is lower and the performance is better, the preparation is complicated and there are high temperature safety problems. In contrast, lithium manganate (LiMnO) with a spinel structure 2 o 4 ) Due to the advantages of rich manganese materials, low price, non-toxicity, low pollution, easy recycling, high working voltage, large amount of delithiation, and good safety performance, it has become a cathode material for lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12C01D15/00H01M4/58
CPCY02E60/10
Inventor 沈菊林张建昌董俊卿
Owner BYD CO LTD
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