Abstract
Lots of lithium ion battery (LIB) products contain lithium metal oxide LiNi5Co2Mn3O2 (LNCM) as the positive electrode’s active material. The stable surface of this oxide results in high resistivity in the battery. For this reason, conductive carbon-based materials, including acetylene black and carbon black, become necessary components in electrodes. Recently, carbon nano-tube (CNT) has appeared as a popular choice for the conductive carbon in LIB. However, a large quantity of the conductive carbon, which cannot provide capacity as the active material, will decrease the energy density of batteries. The ultra-high cost of CNT, compared to conventional carbon black, is also a problem. In this work, we are going to introduce long-length carbon nano-tube s(L-CNT) into electrodes in order to design a reduced-amount conductive carbon electrode. The whole experiment will be done in a 1Ah commercial type pouch LIB. By decreasing conductive carbon as well as increasing the active material in the positive electrode, the energy density of the LNCM-based 1Ah pouch type LIB, with only 0.16% of L-CNT inside the LNCM positive electrode, could reach 224 Wh/kg and 549 Wh/L, in weight and volume energy density, respectively. Further, this high energy density LIB with L-CNT offers stable cyclability, which may constitute valuable progress in portable devices and electric vehicle (EV) applications.
Highlights
Rechargeable lithium-ion batteries (LIB) are widely applied as power sources in many consumer and portable electric devices due to their significant advantages, such as specific working voltage and high energy density
The aim of this study is to examine the effect of a very small amount of L-carbon nano-tube (CNT) as a conductive additive in the LiNi5 Co2 Mn3 O2 (LNCM) pouch lithium ion battery (LIB)
Forms a network-liked frame structure between the active materials at the beginning, which exists until the end of the charge–discharge cycling tests
Summary
Rechargeable lithium-ion batteries (LIB) are widely applied as power sources in many consumer and portable electric devices due to their significant advantages, such as specific working voltage and high energy density. LCO is used in mobile phones and laptop computers with the highest energy density requuirements, and LNCM is generally applied in EV because of the cost and safety issue In both LCO and LNCM, during electrochemical reactions, the oxidation and decomposition of electrolytes results in an interaction on the surface of electrodes, causing defects and capacity decay of the electrode and the cell. Metal oxides and metal fluorides are usually highly stable and electrically non-conductive, and increase the internal resistance of the lithium cells [8,9] In this regard, highly conductive carbon material, with stable properties and reasonable cost, has become known as an effective approach to improving the conductivity of the electrodes [10,11]. With the small amount of effective L-CNT applied, the industry could control the reasonable cost of conductive additives and increase the business value of LIB products
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