A kind of cathode material additive, active material, cathode material and its preparation and application in lithium ion battery
A lithium-ion battery, cathode material technology, applied in active material electrodes, positive electrodes, battery electrodes, etc., can solve problems such as poor storage capacity stability, improve energy density and cycle performance, reduce capacity loss, and simple processes.
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Embodiment 1
[0066] 1. Preparation of additives:
[0067] (1) Weigh LiOH and CoCl with a molar ratio of 6:1:1 2 (Li / Co ratio is 6:1) and citric acid in pure water and heated at 60°C, stirred at 300r / min for a period of time and then dried;
[0068] (2) Perform high-energy ball milling on the dried product in (1) for 1 hour at a ball milling frequency of 5000 Hz;
[0069] (3) Calcining the precursor obtained in step (2) at 750° C. for 18 hours;
[0070] (4) Li obtained in step (3) 6 CoO 4 @C dispersed in PVDF (where Li 6 CoO 4 Li 6 CoO 4 @C@PVDF additive with a particle size of 2μm. The test found that the first charge capacity of the additive was 605mAh·g after storage in air with a humidity of 30% for 24 hours -1 , the first charge and discharge efficiency is 7%.
[0071] 2. LiCoO 2 (75wt%), Li 6 CoO 4 After @C@PVDF additive (5wt%), SuperP (10wt%) and PVDF (10wt%) are mixed evenly, the positive electrode sheet is obtained by pulping, coating, drying, and rolling.
[0072] 3....
Embodiment 2
[0078] 1. Preparation of additives:
[0079] (1) Weigh LiOH and CoCl with a molar ratio of 6.2:1:1 2 (Li / Co ratio is 6.2:1) and citric acid in pure water and heated at 65°C, stirred at 350r / min for a period of time and then dried;
[0080] (2) Perform high-energy ball milling on the dried product in (1) for 1 hour at a ball milling frequency of 7000 Hz;
[0081] (3) Calcining the precursor obtained in step (2) at 700° C. for 18 hours;
[0082] (4) Li obtained in step (3) 6 CoO 4 @C dispersed in PVDF (where Li 6 CoO 4 The mass ratio to PVDF was 6:1) in NMP solution heated at 70°C and stirred at 350r / min for a period of time to obtain Li6CoO4@C@PVDF additive with a particle size of 2μm. The test found that the first charge capacity of the additive was 645mAh g after being stored in air with a humidity of 30% for 24 hours. -1 , the first charge and discharge efficiency is 5%.
[0083] 2. LiCoO 2 (76wt%), Li6CoO4@C@PVDF additive (4wt%), SuperP (10wt%) and PVDF (10wt%) are...
Embodiment 3
[0090] 1. Preparation of additives:
[0091] (1) Weigh LiOH and CoCl with a molar ratio of 6.4:1:1 2 (Li / Co ratio is 6.4:1) and citric acid in pure water and heated at 70°C, stirred at 400r / min for a period of time and then dried;
[0092] (2) Perform high-energy ball milling on the dried product in (1) for 1 hour at a ball milling frequency of 9000 Hz;
[0093] (3) Calcining the precursor obtained in step (2) at 720°C for 20h;
[0094](4) Disperse the Li6CoO4@C obtained in step (3) in the NMP solution of PVDF (where the mass ratio of Li6CoO4 to PVDF is 7:1) and heat at 80°C, and stir at 400r / min for a period of time to obtain Li6CoO4 @C@PVDF additive with a particle size of 1.5μm. The test found that the first charge capacity of the additive was 672mAh g after being stored in air with a humidity of 30% for 24 hours -1 , the first charge and discharge efficiency is 4%.
[0095] 2. LiCoO 2 (76wt%), Li6CoO4@C@PVDF additive (4wt%), SuperP (10wt%) and PVDF (10wt%) are mixed ...
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