Positive electrode active material for lithium secondary battery, method for manufacturing same, and lithium secondary battery including same
A technology for positive active materials and lithium secondary batteries, which is applied in secondary batteries, lithium batteries, battery electrodes, etc., and can solve problems such as the stability limitation of positive active materials
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Embodiment 1
[0128] Dilute NiSO with distilled water 4 、CoSO 4 and MnSO 4 Mixed at a ratio (molar ratio) of 0.75:0.15:0.10, which has been passed with N 2 Dissolved oxygen in distilled water was removed by bubbling for 24 hours. Introduce the solution into a reactor at 50 °C and use NaOH and NH 3 h 2 O was used as a precipitating agent and a chelating agent for a co-precipitation reaction for 48 h to form NCM precursors.
[0129] Thereafter, lithium hydroxide was further added thereto so that the ratio of the NCM precursor to lithium hydroxide was 1:1.05, which was then uniformly stirred and mixed. The mixture was put into a calciner, heated up to 800° C. at a rate of 2° C. / minute, and kept at 800° C. for 10 hours, followed by reaction to form primary lithium metal oxide particles.
[0130] Based on the weight ratio, 3% by weight of Co(OH) 3 Introduced into primary lithium metal oxide particles, then stirred in a high-speed stirrer, and then the mixture was put into a calciner, heat...
Embodiment 2
[0133] The positive active material was prepared according to the same process as described in Example 1, except that when forming the NCM precursor, NiSO was mixed in a ratio (molar ratio) of 0.8:0.1:0.1, respectively. 4 、CoSO 4 and MnSO 4 , and the calcination temperature for forming primary lithium metal oxide particles was adjusted to 750 °C.
Embodiment 3
[0135] The positive active material was prepared according to the same process as described in Example 1, except that when forming the NCM precursor, NiSO was mixed in a ratio (molar ratio) of 0.88:0.09:0.03, respectively. 4 、CoSO 4 , MnSO 4 , and the calcination temperature for forming primary lithium metal oxide particles was adjusted to 700 °C.
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