A lithium ion battery and an electrolyte thereof
A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries and their electrolytes, can solve the problems of decreased storage performance and aggravated oxidation and decomposition of lithium-ion batteries, so as to reduce possibility, reduce gas production, and improve high-temperature storage performance Effect
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Embodiment 1
[0022] Positive electrode preparation: the positive electrode active material LiNi 0.8 co 0.1 mn 0.1 o 2 (lithium nickel cobalt manganese) and conductive agent acetylene black (SuperP) are evenly mixed, then add N-methylpyrrolidone (NMP) binder polyvinylidene fluoride glue (PVDF) into the mixing tank and stir until uniform , wherein the mass ratio of positive electrode active material, conductive agent, and binder is (93:4:3). The obtained slurry is coated on an aluminum foil, baked, rolled, and cut into pieces to obtain a positive electrode sheet.
[0023] Negative electrode preparation: After mixing the negative electrode active material graphite and the conductive agent SuperP evenly, add the binder SBR and deionized water into the mixing tank, and stir until it is uniform. The ratio of the active material, the conductive agent and the binder is (91:3:6). The obtained slurry is coated on a copper foil, baked, rolled, and cut into pieces to obtain a negative electrode s...
Embodiment 2
[0027] Adopt the method for embodiment 1 to prepare positive pole piece;
[0028] Adopt the method for embodiment 1 to prepare negative pole sheet;
[0029] The electrolyte was prepared by the method of Example 1, except that the first additive was to replace the phosphorothioate tris(methyl isocyanate) in Example 1 with 1% mass fraction of phosphorothioate tris(ethyl isocyanate);
[0030] The battery was prepared by the method of Example 1.
Embodiment 3
[0032] Adopt the method for embodiment 1 to prepare positive pole piece;
[0033] Adopt the method for embodiment 1 to prepare negative pole sheet;
[0034] The electrolyte was prepared by the method of Example 1, except that the first additive was to replace the tris(methyl isocyanate) of phosphorothioate in Example 1 with 1% mass fraction of phosphorothioate tris(propyl isocyanate);
[0035] The battery was prepared by the method of Example 1.
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