The development of 18650 high capacity lithium ion batteries are reviewed

Source: 2020 - 04 - 11 18:54 hits: 18650 the development of the high capacity lithium ion battery with high nickel material for the anode, the preparation of 0. 5 c discharge of nominal capacity is 2800 mah, 18650 cylindrical lithium-ion battery. The results show that the high nickel button cell charge-discharge efficiency for 88 at a time. 7%. Lee oxidation to cover the entire range of oxidation peak ( 3. 7 ~ 5. 0 v) In 4. 25 v, Ni 2 + / Ni 4 + electrooxidation, in 5. 0 v, co2 + / Co4 + oxide and nickel oxide in the beginning of reaction, and oxidation of the company and growth potential. High nickel 18650 0 lithium-ion batteries. 5 c, 1。 0c、2. 0 c discharge capacity of 99 respectively. 89%, 99. 26%, 97. 0 38%, discharge temperature. 2 c, satisfy the requirement of battery fast charge and discharge. Battery charging and discharging 20 weeks and 100 weeks, 200 weeks and 450 weeks corresponding capacity retention of 98 respectively. 40%, 94. 74%, 87. 62%, 82. 22%. At low power ratio ( 0. 5c) , the traditional 18650 battery cooling effect similar to experimental cell. With the increase of discharge ratio, the structure of the two kinds of heat transfer temperature difference is also increased. Key words: 18650 lithium ion battery; High capacity; The electrochemical properties; Cycle life; The rate of discharge, The cooling structure of lithium ion battery has high voltage, small volume, light weight, than the high energy density, no memory effect, long service life, etc. Currently, the main market of lithium ion battery is divided into square, flat, cylindrical, etc, compared with the square, 18650 cylindrical lithium-ion batteries, has the following advantages: high energy density, energy density higher than 30%; ( 2) A considerable effect on the safety of the arrangement of the battery, once the battery heating control, because the volume is small, it is not easy to influence the battery around; ( 3) Low cost. Therefore, it is widely used in notebook computers, flashlight, digital cameras, portable speaker, etc. Due to poor equipment and lack of technical background, the domestic product quality can't guarantee 18650 cylindrical lithium-ion battery enterprises, market competition ability is poor, so products can flow into the medium and low-end market, medium and low-end market the huge demand of misleading the market direction. How to survive and stand out in many enterprises lithium-ion batteries, need to enterprise attaches great importance to the development of high-end products. High capacity ( 2800 mah) 18650 lithium ion battery of the main problem is to raise the battery capacity and the effective heat dissipation. This paper developed a high nickel anode large-capacity lithium ion battery, and compared with traditional structure cell electrochemical performance comparison.