锂电池电极中元素分布检测方案

HORIBAScientificEnergy Typical results Application Note Glow Discharge Spectrometry GD 18 Features and Benefits of Pulsed RF GD OES for the characterisation ofelectrodes of Li-ion batteries Patrick Chapon， HORIBA Scientific， 16 rue du Canal， 91160 Longjumeau， France Abstract Pulsed RF Glow Discharge Optical Emission Spectrometry provides Ultra Fast Elemental Depth Profiling and is of great interest for thecharacterisation of both positive and negative electrodes of Li-ion batteries Key words Li-ion batteries， positive and negative electrodes， Depth Profile Analysis， gradients， GD OES， Pulsed RF source， Li bell. A Li-ion battery is a rechargeable battery in which lithium ions movebetween the anode and the cathode creating an electricity flow. Electron and Li-ion move reversely at charging Source Automotive Energy Supply Corporation， 2007 The chemical reactions do not simply take place at the surface of theelectrodes but rather affect depths of several tens of micrometers.Pulsed RF Glow Discharge Optical Emission Spectrometry providesUltra Fast Elemental Depth Profiling of thin and thick films and hasbeen successfully applied for the characterisation of both positive andnegative electrodes of Li ion batteries. HORIBA Scientific has more than 15 references world wide in this field.Most results obtained are protected by Non Disclosure Agreement andcannot be communicated. We therefore invite people interested in thetechnique to contact us so that we could also describe more in depth，the unique proprietary features of our instrument and set up someperformance tests. The GD Profiler2 couples an advanced Pulsed RF Glow Discharge Sourceto a high resolution， wide spectral range Optical Emission Spectrometer. The source (GD plasma) permits on one hand a precise and fast sputteringof a representative part (typically 4mm in diameter) of the electrodeinvestigated. Pulsed RF operation is crucial to avoid damaging the fragileelectrodes and to prevent unwanted diffusion of the elements during themeasurements. The sputtered species are excited on the other hand by the same GDplasma and the spectrometer simultaneously measures all elements ofinterest (Li， Co， H， C， Mn， S， 0， F， Al， P， Ni， V， Ti， Si，B， Cu etc) as a functionof the sputtered depth. GD Profiler 2 60 Pulsed RF GD OES Depth Profile Analysis of the positive electrodeof a battery fully charged and discharged Key Features √Ultra Fast Depth Profiling of both positive and negative electrodes： Typi-cal erosion rate of several microns/minute. √Fast sputtering offers high sample throughput but more importantly ahigher sensitivity as more sputtered materials are excited per unit of time. Ease of Use： The GD source does not require any UHV， the sample toanalyse is simply placed against an o'ring facing the anode tube in whichthe plasma is confined Simultaneous measurement of all elements of interest Averaged information over the sputtered area v√Provide quick access to embedded interfaces for further SEM obser-vation No thermal effects during measurements with Pulsed RF operation Sample handling strategies The electrodes are often soft and fragile. Successful strategies of samplehandling have been developed by HORIBA Scientific to correctly analysethese electrodes including， for the flammable ones， a patented transferchamber：the “Li bell". Schematic view of the Li bell mountedon the GD Profiler 2 instrument Conclusion Whether you study new electrodes or coatings behaviours， charge anddischarge processes， process controls， or perform comparative studies forLi-ion batteries， Pulsed RF Glow Discharge Optical Emission Spectrometryis a valuable companion tool. References Investigation of positive electrodes after cycle testing of high-powerLi-ion battery cells Ⅳ. An approach to the power fading mechanism bydepth profile analysis of electrodes using glow discharge optical emissionspectroscopy. Yoshiyasu Saito， Md. Khalilur Rahman. Journal of Power Sources 174(2007)877-882 The effects of LaPO coating on the electrochemical properties ofLi[Ni0.5Co0.2Mn0.3]0， cathode material. Han Gab Song， Kyu-Sung Park， Yong Joon Park Solid State lon. (2012)，doi：10.1016/j.ssi.2011.12.014 info.sci@horiba.comwww.horiba.com/scientific HORIBAExplore the futureAutomotive Test Systems| Process & Environmentalalll MedicallSemiconductorScientific