Lifepo4 battery manufacturer Specialized in Energy Storage Battery since 2009.

Introduction of secondary lithium battery and its development status and existing problems

by:dcfpower     2021-04-02
Lithium batteries have the advantages of high operating voltage, high specific energy, wide operating temperature range, and stable discharge. They are the focus of chemical power research in recent years. Research on lithium batteries began in the late 1950s, and its development has gone through three stages: lithium primary batteries, metal lithium secondary batteries, and lithium ion secondary batteries. Lithium primary batteries usually directly use metal lithium as the negative electrode, according to the electrolyte The type and cathode materials used can be divided into soluble cathode batteries (such as Li/SO2, Li/SCC12 and Li/S02C12, etc.), solid cathode batteries (such as Li/Mn02, Li/(CF). And Lif CuO, etc.) ), four types of solid electrolyte batteries (such as Li/LiI/I2 (P2VP)) and molten salt electrolyte batteries (LiA1/LiC1-KC1/FeS2). Since entering the 20th century, portable electronic devices have been designed to become smaller and smaller, and the demand for rechargeable batteries that are lighter, smaller, and last longer has also increased. Although tin-nickel batteries have done a lot of work to meet the requirements in this regard, their performance in terms of energy has reached the limit, and it has a great impact on the environment. Therefore, it is necessary to develop a novel electrochemical cell. Since the 1980s, primary batteries using metallic lithium as anode and non-aqueous electrolyte have successfully entered the market. Compared with ordinary dry batteries using aqueous electrolyte, they have significant features: 1) high voltage; 2) high specific energy (including volume ratio energy and weight ratio energy); 3) low self-discharge rate; 4) broad response temperature range. Therefore, as a candidate for high specific energy batteries, lithium batteries have attracted more and more attention. Various types of lithium primary batteries represented by Li/Mn02 have entered the market widely, marking that lithium primary batteries are organic solvents containing lithium salts. It developed rapidly in the mid-1980s, with many systems, and gradually Li/MoS2, Li/Mn and LiV205 were the main ones. However, the metal lithium and the electrolyte undergo a chemical reaction during charge and discharge, so that the utilization rate of metal lithium is only 25%. The high energy density characteristics of lithium batteries are greatly weakened. A lot of work has been done to develop secondary lithium batteries. However, many practical problems have been encountered in the development of secondary lithium batteries, including: 1) poor cycle performance, 2) long charging time, and 3) low safety performance. Almost all of these problems are caused by the dendrites of lithium formed during the charging process. In order to solve the shortcomings of lithium metal anodes, some materials that can store lithium have begun to be studied as anode materials, including aluminum, Wood's alloy and graphite. Electrochemical workers seek lithium-ion secondary batteries that use lithium-intercalated carbon materials as negative electrodes In recent years, it has developed rapidly. Sony started to develop lithium batteries with metallic lithium as anode in 1985, and in 1986 began to develop lithium batteries with carbon as anode. Successfully developed a novel secondary battery with carbon as anode, and first introduced it to the market in 1990. Regarding the research of ion secondary battery raw materials, their characteristics, process technology and battery performance, please pay attention to the next article of Electronic Technology Co., Ltd.;u003c/pu003e
Custom message
Chat Online 编辑模式下无法使用
Chat Online inputting...
We will get back to you asap