Lithium secondary battery positive active material
A positive active material, lithium secondary battery technology, applied in secondary batteries, active material electrodes, lithium storage batteries, etc., can solve thermal and mechanical stability degradation, life characteristics and stability limitations, lithium secondary batteries Problems such as deterioration of life characteristics and operational stability
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preparation example Construction
[0093] Preparation of the first lithium-transition metal composite oxide particles
[0094] While grinding, the Ni as NCM precursor 0.82 co 0.13 mn 0.10 (OH) 2 Mix with LiOH as lithium source for about 20 minutes. The mixed powder was calcined at a predetermined temperature for 15 hours, and then subjected to grinding, sieving and iron removal processes to prepare LiNi with the overall composition formula 0.82 co 0.13 mn 0.10 o 2 The first lithium-transition metal composite oxide particles in single particle form (including single crystal and polycrystalline structures), the crystal grains of the particles measured by XRD analysis and using the above-mentioned Equation 1 are controlled by temperature control during calcination size.
[0095] The specific XRD analysis equipment / conditions are shown in Table 1 below.
[0096] [Table 1]
[0097]
[0098] Preparation of Second Lithium-Transition Metal Composite Oxide Particles
[0099] By adding nickel precursor ...
experiment example
[0111] (1) Measurement of thermal gas production
[0112] After charging (1C 4.2V 0.1C cut-off) the lithium secondary batteries of Examples and Comparative Examples having the positive electrode compositions in Table 2, it was confirmed by gas chromatography (GC) analysis that they were stored in a constant temperature room at 60°C for 1 week and 4 weeks amount of gas produced.
[0113] (2) Determination of the amount of gas generated after repeated charging and discharging
[0114] By GC analysis, after repeated charging (CC-CV 1.0C 4.2V 0.05C cut-off) and discharge (CC 1.0C 2.7V cut-off) 100 times and 300 times in a constant temperature room at 45°C, the lithium in the examples and comparative examples was measured The amount of gas generated by the secondary battery.
[0115] The evaluation results are shown in Table 3 below.
[0116] [table 3]
[0117]
[0118] Referring to Table 3, in the case of Examples including first lithium-transition metal composite oxide p...
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