Lithium secondary battery electrode plate protective layer and preparation method thereof
A lithium secondary battery and protective layer technology, which is applied in the field of lithium secondary battery electrode sheet protective layer and its preparation, can solve the problems of battery electrode sheet thermal stability deterioration, battery combustion, thermal runaway, etc., and achieve charging and discharging efficiency Improved, improved cycle life, good properties
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Embodiment 1
[0028] Positive electrode sheet: 100kg of positive electrode active material LiNi 0.8 co 0.1 mn 0.1 o 2 Mix with 5kg conductive agent acetylene black, 5kg binder polyvinylidene fluoride, add solvent N-methylpyrrolidone and stir evenly to form positive electrode slurry, apply positive electrode slurry to aluminum foil current collector, dry, and set aside.
[0029] Negative electrode sheet: Mix 100kg of negative electrode active material silicon-carbon composite material with 5kg of conductive agent acetylene black, 5kg of binder (a mixture of styrene-butadiene latex and sodium carboxymethyl cellulose), and add deionized water to stir evenly to form a negative electrode Slurry, the negative electrode slurry is coated on the copper foil current collector, dried, and set aside.
[0030] Mixed solution of organic polymers, lithium salts, and nano-metal oxides: the entire preparation process is carried out at a dew point of -50°C, and 5kg of thermoplastic polyurethane, 5kg of li...
Embodiment 2
[0035] The positive electrode active material in embodiment 1 is replaced by LiNi 0.6 co 0.1 mn0.3 o 2 , the negative electrode was replaced by artificial graphite, and all the other conditions were the same as in Example 1.
[0036] Electrochemical test results: (1) After testing, the solid-state lithium secondary battery has a single energy density of 260Wh / kg, continuous charge and discharge cycles of 1000 times at a rate of 0.3C, a capacity retention rate of 93.8%, and a charge and discharge efficiency of 99.8%. ;(2) After the battery was fully charged (100% SOC), it was discharged one month later, and the self-discharge rate was 0.39%; (3) After the battery was fully charged (100% SOC), acupuncture was performed on the battery, and the results showed: No smoke, no fire, no explosion.
Embodiment 3
[0038] The positive electrode active material in embodiment 1 is replaced by LiNi 0.6 co 0.2 mn 0.2 o 2 , the negative electrode was replaced by artificial graphite, and all the other conditions were the same as in Example 1.
[0039] Electrochemical test results: (1) After testing, the solid-state lithium secondary battery has a single energy density of 255Wh / kg, continuous charge and discharge cycles of 1000 times at a rate of 0.3C, a capacity retention rate of 94.1%, and a charge and discharge efficiency of 99.8%. ;(2) After the battery was fully charged (100% SOC), it was discharged one month later, and the self-discharge rate was 0.33%; (3) After the battery was fully charged (100% SOC), acupuncture was performed on the battery, and the results showed: No smoke, no fire, no explosion.
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Abstract
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