Positive electrode material of multi-element layered lithium ion battery and preparation method thereof
A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems that the sintering temperature cannot reach the metal oxide, and the structural suppression of Li-Ni and metal oxide intercalation can not be achieved. Good cycle performance, stable structure, improved thermal stability
Examples
Embodiment 1
[0035] The chemical formula of the lithium-ion battery cathode material in this embodiment is LiNi 0.5 co 0.2 mn 0.29 al 0.01 o 2 , its preparation method comprises the following steps:
[0036] 1) Dosing: mix Mn(NO 3 ) 2 , Ni(NO 3 ) 2 and Co(NO 3 ) 2 The first solution was formulated at a molar ratio of 3:5:2.9, and Al(NO 3 ) 3 Make the second solution, make the third solution with EDTA, and make the fourth solution with NaOH;
[0037] 2) Reaction: Using the parallel flow method, inject the four solutions into the reaction kettle at the same time, stir vigorously, control the pH value between 10-14 during the stirring process, and control the temperature of the reaction kettle at 40-70°C during the reaction process; After completion, filter, wash, and dry to obtain a hydroxide precursor uniformly doped with Al, and there is an inert gas or nitrogen protection in the reaction kettle;
[0038] 3) Pre-sintering: pre-sintering the precursor of step 2) at 500°C for 5 ...
Embodiment 2
[0043] The chemical formula of the lithium-ion battery cathode material in this embodiment is LiNi 0.4 co 0.2 mn 0.39 Mg 0.01 o 2 , its preparation method comprises the following steps:
[0044] 1) Dosing: mix Mn(NO 3 ) 2 , Ni(NO 3 ) 2 and Co(NO 3 ) 2 The first solution was formulated at a molar ratio of 3.9:4:2, and Mg(NO 3 ) 2 Make the second solution, make the third solution with EDTA, and make the fourth solution with NaOH;
[0045] 2) Reaction: Using the parallel flow method, inject the four solutions into the reaction kettle at the same time, stir vigorously, control the pH value between 10-14 during the stirring process, and control the temperature of the reaction kettle at 40-70°C during the reaction process; After completion, filter, wash, and dry to obtain a hydroxide precursor uniformly doped with Mg, and there is an inert gas or nitrogen protection in the reaction kettle;
[0046] 3) Pre-sintering: pre-sintering the precursor of step 2) at 500°C for 5 ...
Embodiment 3
[0051] The chemical formula of the cathode material of the lithium ion battery in this embodiment is LiNi 0.5 co 0.2 mn 0.285 al 0.01 Mg 0.005 o 2 , its preparation method comprises the following steps:
[0052] 1) Dosing: mix Mn(NO 3 ) 2 , Ni(NO 3 ) 2 and Co(NO 3 ) 2 The first solution was formulated at a molar ratio of 2.85:5:2, and Mg(NO 3 ) 2 Make the second solution, make the third solution with EDTA, and make the fourth solution with NaOH;
[0053] 2) Reaction: Using the parallel flow method, inject the four solutions into the reaction kettle at the same time, stir vigorously, control the pH value between 10-14 during the stirring process, and control the temperature of the reaction kettle at 40-70°C during the reaction process. After completion, filter, wash, and dry to obtain a hydroxide precursor uniformly doped with Mg, and there is an inert gas or nitrogen protection in the reaction kettle;
[0054] 3) Pre-sintering: pre-sintering the precursor of step...
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Description
Claims
Application Information
- IPC
- H01M4/505; H01M4/525
- CPC
- Y02E60/122; H01M4/505; H01M4/525; H01M4/628; Y02E60/10
- Inventors
- 阮丁山; 夏恒涛