Study of high-capacity 18650 Li-ion battery
WU Xiao-lan
Abstract：18650 cylindrical Li-ion battery was made with nickel-rich composite material as cathode in this paper.And the battery’s nominal capacity was 2 800 mAh at 0.5 C.The performance of nickel-rich composite button cell and 18650 type full battery was tested.The testing results showed that,the first charge/discharge rate of the composite materials of cobalt/nickel/man-ganese was 88.7%,and Li oxidation covered the oxidation peak from 3.7 V to 5.0 V,and the oxidation of Ni2 + to Ni4+ at 4.25 V,while Co3 + oxidized to Co4+ at 5.0 V,Ni oxidation preferen-tially occurred at the beginning of the reaction.With the increasing of potential,the Co3 + subse-quently oxidized.For the nickel-rich composite 18650 type full battery,the discharge of 0.5C, 1.0 C,2.0 C rate contrasting to 0.2C was 99.89%,99.26%,97.38%,respectively.And it can meet the requirements of fast charge/discharge.The capacity retention rate of 18650 type full battery after (0.5C charge /1 C discharge)20 cycles,100 cycles,200 cycles,475 cycles,was 98.40%,94.74%,87.62%,82.22% ,respectively.At low discharge rate,there was no marked difference between the traditional structure 18650 battery and the tested nickel-rich bat-tery.And with the increasing of the discharge rate,the temperature difference of two structure battery increased.
Keywords：18650 Li-ion batteryhigh capacityelectrochemical propertycycle lifedischarge rateheat dissipation structure
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 134-138 )