Great current power lithium ion battery and method for making same
A lithium-ion battery and high-current technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problem of unsatisfactory high-current performance of lithium-ion batteries, unsatisfactory startup and acceleration climbing capabilities, and capacity density. and high energy density to achieve good cycle stability, good start-up, and low internal resistance
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Embodiment 1
[0027] 65wt.% positive active material LiCoO 2 , 20wt.% conductive agent acetylene black, 15wt.% binder polyvinylidene fluoride and solvent N-4-methylpyrrolidone equal to the total weight of the above-mentioned materials are mixed, and stirred at a high speed in a vacuum mixer for 10 hours to obtain Evenly distributed slurry. Then, it is coated on an aluminum foil, and the thickness is controlled to be 40 microns, and dried in a vacuum at 120° C. to obtain a coated positive electrode sheet. Similarly, the positive electrode active material was changed to the negative electrode active material CMS-G05 (Shanghai Shanshan Technology Co., Ltd.), and the coated negative electrode sheet was obtained according to the capacity corresponding to the positive electrode.
[0028] The coated positive pole piece and negative pole piece are respectively cut and rolled, and then coiled, welded, liquid injected, sealed and formed according to the production process of the power lithium-ion ba...
Embodiment 2
[0035] Change the positive electrode active material in embodiment 1 into LiMn 2 o 4 , the weight percentage is changed to 50wt.%, the amount of the conductive agent is changed to 30wt.%, the amount of the binder is changed to 20wt.%, the coating thickness is changed to 50 microns, and other conditions are unchanged, and the coated positive electrode is obtained. piece. Similarly, the amount of the conductive agent in the corresponding negative electrode was changed to 30wt.%, and the amount of the binder was changed to 20wt.%, to obtain a coated negative electrode sheet.
[0036] The coated positive pole piece and negative pole piece are respectively cut and rolled, and then coiled, welded, liquid injected, sealed and formed according to the production process of the power lithium-ion battery to obtain the power lithium-ion battery.
[0037] Compared with the power lithium ion battery prepared in Comparative Example 2, the power lithium ion battery has good rate performance...
Embodiment 3
[0043] Change the positive electrode active material in embodiment 2 into ternary positive electrode material Li[Co 1 / 3 Ni 1 / 3 mn 1 / 3 ]O 2 , the coating thickness was changed to 30 microns, and other conditions remained unchanged, and a coated positive electrode sheet was obtained. The thickness of the corresponding negative electrode is changed accordingly, and other conditions remain unchanged, and a coated negative electrode sheet is obtained.
[0044] The coated positive pole piece and negative pole piece are respectively cut and rolled, and then coiled, welded, liquid injected, sealed and formed according to the production process of the power lithium-ion battery to obtain the power lithium-ion battery.
[0045] Compared with the power lithium ion battery prepared in Comparative Example 3, the power lithium ion battery has good rate performance. See Table 1 for the capacity retention at different rates.
[0046] Table 1 The capacity retention rate of the power batter...
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