Composite cathode material for lithium ion batteries and preparation method thereof
A composite cathode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc. The effect of lithium ion conduction rate, increasing specific capacity, and reducing impedance
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[0015] The present invention will be further described in detail below with reference to the drawings and specific embodiments.
[0016] Take ascorbic acid as carbon source, Li 7 La 3 Zr 2 O 12 For solid electrolyte, and Li 3 V 2 (PO 4 ) 3 Co-preparation of double-coated composite cathode materials.
[0017] Step 1. Dissolve ascorbic acid in deionized water, stir at 80℃, and then add LiNO 3 ·H 2 O, La(NO 3 ) 3 ·6H 2 O and Zr (NO 3 ) 4 · 5 H 2 O, the molar ratio is ascorbic acid: LiNO 3 ·H 2 O: La(NO 3 ) 3 ·6H 2 O: Zr(NO 3 ) 4 · 5 H 2 O=3.5:7:3:12, continue to stir until a sol is formed.
[0018] Step 2. Add the Li prepared before 3 V 2 (PO 4 ) 3 The materials are transferred to an autoclave and reacted at 180-200°C for 24-40 hours, and then the resulting product is stirred at 70-90°C until the water is evaporated.
[0019] Step 3. Finally, the obtained precursor is sintered at 700-780°C under an inert gas atmosphere for 8-10 hours to obtain the final material.
[0020] The present inven...
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