Microcrystal LiVOPO4-LiMPO4-TiO2 composite lithium battery material and preparation method thereof
A technology of composite lithium and electrical materials, applied in the direction of batteries, circuits, electrical components, etc., can solve the problems of low electronic conductivity of glass-ceramic, unsatisfactory cycle performance, and slow diffusion coefficient of lithium ions, so as to improve the rate performance and cycle performance, improving low-temperature rate performance and cycle life, and avoiding side reactions
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Embodiment 1
[0020] (1) 71 copies of LiVOPO 4 Glass-ceramic, 20 parts LiMPO 4 and 9 parts nano-TiO 2 Put it into a conical ribbon mixer, mix the materials for 0.5h, and mix evenly to obtain a mixture; the mixture is pre-sintered in an air atmosphere at 200°C for 2h to form a precursor; the precursor is calcined in an air atmosphere at 400°C for 1h to obtain LiVOPO 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 Composite lithium battery material.
[0021] (2) The resulting sample (i.e. the LiVOPO prepared in step 1 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 The electrochemical performance of the composite lithium battery material) was measured as follows: 95 parts of samples, 3 parts of carbon black SP, 2 parts of graphite KS-15 and 5 parts of polyvinylidene fluoride (PVDF) were dissolved in the solvent N-methylpyrrolidone (NMP) to form a slurry, and evenly coat the slurry on the aluminum foil to form an electrode sheet with a coating thickness of about 110 μm. Cut the electrode sheet to an area of ...
Embodiment 2
[0023] (1) Mix 80 copies of LiVOPO 4 Glass-ceramic, 13 parts LiMPO 4 and 7 nano-TiO 2 Put it into a conical ribbon mixer, mix the materials for 0.7h, and mix evenly to obtain a mixture; the mixture is pre-sintered in an air atmosphere at 300°C for 5h to form a reaction precursor; the precursor is calcined in an air atmosphere at 500°C for 4h to obtain LiVOPO 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 Composite lithium battery cathode material.
[0024] (2) 95 samples (i.e. LiVOPO prepared in step 1 4 Glass-ceramic-LiMPO 4 -nano-TiO 2Composite lithium battery material), 3 parts of carbon black SP, 2 parts of graphite KS-15 and 5 parts of polyvinylidene fluoride (PVDF), made electrode sheets according to Example 1 and assembled into batteries. Charge to 4.2V at a rate of 20mA / g (equivalent to 0.1C in terms of positive electrode), and discharge to 2.75V. The first discharge curve obtains a stable discharge voltage platform of 3.85V. The first reversible specific capacity is abou...
Embodiment 3
[0026] (1) 93 copies of LiVOPO 4 Glass-ceramic, 5 parts LiMPO 4 and 2 parts Nano TiO 2 Put it into a conical ribbon mixer, mix the materials for 1 hour, and mix evenly to obtain a mixture; the mixture is pre-sintered in an air atmosphere at 400°C for 10 hours to form a reaction precursor; the precursor is calcined in an air atmosphere at 600°C for 10 hours to obtain LiVOPO 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 Composite lithium battery cathode material.
[0027] (2) 95 samples (i.e. LiVOPO prepared in step 1 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 Composite lithium battery material), 3 parts of carbon black SP, 2 parts of graphite KS-15 and 5 parts of polyvinylidene fluoride (PVDF), made electrode sheets according to Example 1 and assembled into batteries. Charge to 4.2V at a rate of 20mA / g (equivalent to 0.1C in terms of positive electrode), and discharge to 2.75V. The first discharge curve obtains a stable discharge voltage platform of 3.85V. The first reversible specific c...
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