Lithium titanophosphate as cathode, anode and electrolyte for lithium batteries

The electrochemical properties and ionic conductivity of the LiTi2(PO4)33 (S.g. R-3c) synthesized via mechanical activation (MA) route have been investigated. It was shown that MA decreases temperature and time of synthesis facilitating preparation of more homogeneous final compound. The cycling studies were carried out with electrochemical cell LiTi2(PO4)3 (С) / LiPF6 + EC + DMC / Li in galvanostatic regime. It was shown that practical electrochemical capacity of the compounds prepared using MA is about 20% higher than for ceramic ones in the 2.0-3.5 V range. It was found that LiTi2(PO4)3, NaTi2(PO4)3 and КТi2(PO4)3 are able to cycle reversibly in the 0.2-1.5 V range, possibly due to irreversible chemical changes of the electrode materials with participation of P04-groups. It was shown that the conductivity of LiTi2(PO4)3 and Li1.3Al0.3Ti1.7(PO4)3 obtained via MA is 2-3 orders of magnitude higher than for ceramic compounds due to reduction of grain boundary resistance.