u003cpu003eAbstract: This article is a review of lithium battery pack
literature in the past two months. We searched Web of Science from April 1, 2014 to May 31, 2014 using lithium 'and battery*' as keywords. There are 1084 research papers on lithium batteries online, and 100 of them are selected for comment. The research work of layered oxide cathode materials includes material structure and surface structure analysis, as well as the influence of surface coating on the charge and discharge cycle life of the material. The high-voltage spinel structure LiNi0.5M1.5O4 material mainly studies doping and surface coating. The research on lithium iron phosphate involves material preparation methods and thermal stability research. High-capacity silicon-based anode materials have always been a hot research topic. The changes in structure and microstructure of silicon anode materials during the process of lithium insertion and removal, as well as silicon or silicon oxide and carbon or metal composite materials are the research focus. There are many research papers on electrolytes. There are also many papers on carbon materials and tin/tin oxide composite anode materials, solid electrolytes, lithium-air batteries, and lithium-sulfur batteries. Theoretical simulation work includes research on lithium insertion with silicon anode materials and research on the dynamic process of cathode materials. In addition to these materials-based studies, there are also many research papers on in-situ analysis of batteries, battery models, and battery manufacturing technology. . u003c/pu003eu003cpu003eKeywords: lithium battery; lithium iron phosphate battery; positive electrode material; negative electrode material; electrolyte; battery technologyu003cpu003eCai et al. synthesized a lithium salt based on polymeric aromatic bis(benzenesulfonyl)imide Single-ion conductor, combined with PVDF-HFP to prepare a membrane. The Li+ migration number of the membrane is close to 0.9, and the net conductivity of Li+ can reach 3.96×104 S/cm. It is adsorbed on the Cealgard polyolefin porous membrane with the liquid electrolyte Equivalent, higher than the Li+ exchanged NafionNR211 membrane, the lithium iron phosphate half-cell using this diaphragm can work normally at room temperature and 80 ℃, and the performance of the electrode with lithium sulfonamide monomer is betteru003c/pu003eu003cpu003e Orvananos et al. proposed a computational model to study the phase separation reaction process in nanomaterial electrodes. The model is based on the following assumption: Although the two-phase reaction is thermodynamically favorable, the higher interface energy in the nanoparticles inhibits the coexistence of the two phases, so the two-phase separation in the lithium process exists between particles rather than in individual particles. u003c/pu003eu003c/pu003eu003cpu003eBernhard et al. used online electrochemical mass spectrometry to study the gas swelling behavior of Li4Ti5O12 electrode. When charging, the single-electron reduction of water produces H2 and OH. The amount of H2 produced is positively correlated with the water content in the battery. OH further catalyzes the decomposition of cyclic carbonates and produces CO2 and carbonates.u003c/pu003eu003cpu003e Oligomer. Dubeshter et al. described a method for measuring the pore tortuosity/porosity ratio (ie MacMullin parameter) of porous electrodes of lithium-ion batteries through gas transport resistance, so that the pore bending rate can be calculated after measuring the porosity, a typical automobile The bending rate of the battery graphite negative electrode is (5.95±0.51) and the porosity is (28.5%±1.3%); the tortuosity of the positive electrode is (3.74±0.38), the porosity is (21.5%±0.25%), and the tortuosity is high Predicted value based on Brugman's relationship. Ganter et al. took out the positive electrode of LiFePO4 battery
whose capacity had decayed by 20% after cycling, and performed electrochemical lithiation or chemical lithiation, which can restore the performance of the positive electrode. This may be a low-energy regeneration method of lithium iron phosphate battery positive electrode. u003c/pu003eu003cpu003eu003cpu003eDubarry et al. analyzed the capacity decay characteristics of power and energy lithium iron phosphate batteries. For high-power batteries, the capacity decay during the first 300 cycles is mainly related to the loss of active lithium; The situation of the energy battery is a little more complicated. By analyzing the capacity decay behavior and dQ/dV curve during charging and discharging at different rates, it can be concluded that the loss of active lithium and the active material in the negative electrode discharge state during the first 120 cycles The main factor is the loss of the anode. At the same time, the active surface area of u200bu200bthe positive electrode increases, and the phenomenon of electrochemical grinding may occur. u003c/pu003eu003c/pu003eu003c/pu003e
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