Preparation method of spinel-type LiMn2O4 cathode material coated by cobalt-aluminum composite metal oxide
A spinel type, composite metal technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as poor coating effect, and achieve the effect of good electrochemical cycle stability
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[0024] Example 1:
[0025] Weigh 4.44g Co(NO 3 ) 2 ·6H 2 O and 2.07g Al(NO 3 ) 3 ·9H 2 O is dissolved in 100mL deionized water to obtain 0.15mol / L Co(NO 3 ) 2 And 0.055mol / L Al(NO 3 ) 3 Mixed salt solution; weigh 1.87g LiOH·H 2 O was dissolved in 100mL deionized water to obtain 0.45mol / L LiOH solution; 30g LiMn 2 O 4 Add to 100mL deionized water, mechanically stir to obtain a suspension; add 50mL Co(NO 3 ) 2 And Al(NO 3 ) 3 At the same time, add LiOH solution dropwise to keep the pH of the suspension at 10.5; after crystallization for 1 hour, filter to obtain cobalt-aluminum hydrotalcite-coated LiMn 2 O 4 Precursor. Add the remaining 50mL Co(NO 3 ) 2 And Al(NO 3 ) 3 The mixed salt solution and the remaining LiOH solution were added to a colloidal mill with a rotation speed of 3500 revolutions per minute for 3 minutes to obtain a cobalt-aluminum hydrotalcite suspension; the cobalt-aluminum hydrotalcite prepared above was coated with LiMn 2 O 4 The precursor was added to the cobalt-a...
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[0028] Example 2:
[0029] Weigh 11.88g Co(NO 3 ) 2 ·6H 2 O and 7.65gAl(NO 3 ) 3 ·9H 2 O is dissolved in 60mL deionized water to obtain 0.68mol / L Co(NO 3 ) 2 And 0.34mol / L Al(NO 3 ) 3 Mixed salt solution; weigh out 5.45g LiOH·H 2 O was dissolved in 100mL deionized water to obtain a 1.3mol / L LiOH solution; 200g LiMn 2 O 4 Add to 100mL deionized water, mechanically stir to obtain a suspension; 30mL Co(NO 3 ) 2 And Al(NO 3 ) 3 At the same time, add LiOH solution dropwise to keep the pH value of the suspension at 9.0; after 0.5 hours of crystallization, filter to obtain cobalt-aluminum hydrotalcite-coated LiMn 2 O 4 Precursor. The remaining 30mL Co(NO 3 ) 2 And Al(NO 3 ) 3 The mixed salt solution and the remaining LiOH solution were added to a colloidal mill with a rotation speed of 3000 revolutions per minute for 5 minutes to obtain a cobalt-aluminum hydrotalcite suspension; the cobalt-aluminum hydrotalcite prepared above was coated with LiMn 2 O 4 The precursor was added to the cobal...
Example Embodiment
[0031] Example 3:
[0032] Weigh 5.93g Co(NO 3 ) 2 ·6H 2 O and 2.75g Al(NO 3 ) 3 ·9H 2 O is dissolved in 50mL deionized water to obtain 0.41mol / L Co(NO 3 ) 2 And 0.15mol / L Al(NO 3 ) 3 Mixed salt solution; weigh out 2.50g LiOH·H 2 O was dissolved in 50mL deionized water to obtain a 1.2mol / L LiOH solution; 60g LiMn 2 O 4 Add to 50mL deionized water, mechanically stir to obtain a suspension; add 20mL Co(NO 3 ) 2 And Al(NO 3 ) 3 LiOH solution was added dropwise to keep the pH of the suspension at 12.0; after 3 hours of crystallization, the cobalt-aluminum hydrotalcite coated LiMn was obtained by filtration 2 O 4 Precursor. The remaining 30mL Co(NO 3 ) 2 And Al(NO 3 ) 3 The mixed salt solution and the remaining LiOH solution were added to a colloidal mill with a rotation speed of 4000 revolutions per minute for 1 minute to obtain a cobalt-aluminum hydrotalcite suspension; the cobalt-aluminum hydrotalcite prepared above was coated with LiMn 2 O 4 The precursor was added to the cobalt-alu...
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