富锂锰基层状正极材料电压衰退研究进展

Progress of Voltage Fade in Layered Li-rich Mn-based Cathode Materials

相对于目前己商业化的锂离子电池正极材料,富锂镜基层状正极材料具有灵高的比彖量(>250 mAh/g),得到国内外卢泛重视,被认为是下一代高比能动力电池看选的正极材料。然而,进一步的研老发现,富锂猛基层状正极材料要卖现商业化应用,还有许多关键问题需要鮮决,其中之一就是克放电过程中的电压衰遥问题:近年来人们通过先进表征手段的应用,揭示了电压衰退.与材料表面相变、阴离子氧化还原、过康全厲离子迁移以及材料微观缺陷等密切相关,并从卖用角度开展大量工作,为解决这一问题提出了很多建设性意见。为此,本丈糸统性总结了易年来全世界对于富锂猛基正极材料电压衰退机制的研老及进展,并对进一步发展的方向提出建议。

Comparing to the commercial Li-ion cathode materials,Li・rich Mn-based material shows high capacitywhich is more than 250 mAh/g, arousing great attentionall over the world and is regarded as the primary promisingcandidate for long endurance electric vehicle.However, there are still some unsolved problems to bepromoted on its way to commercialization, one of whichis the voltage fade during cycling. Many research groupsdisclosed that the mechanism of voltage decay relates to the phase transformation on the surface, anion redoxand oxygen release, transition metal-migration and themicrostructural defects bom with LMR using advancedcharacterization technology methods, and thus broughtup lots of constructive advice on the aspect for practicaluse. In this paper, the progress of voltage fade mechanismin LMR materials is systematically reviewed, andsuggestions for further research are offered.