Coulombic efficiency lithium polymer batteries

Arie et al. [116] investigated the electrochemical characteristics of phosphorus-and boron-doped silicon thin-film (n-type and p-type silicon) anodes integrated with a solid polymer electrolyte in lithium-polymer batteries. The doped silicon electrodes showed enhanced discharge capacity and coulombic efficiency over the un-doped silicon electrode, and the phosphorus-doped, n-type silicon electrode showed the most stable cyclic performance after 40 cycles with a reversible specific capacity of about 2,500 mAh/g. The improved electrochemical performance of the doped silicon electrode was mainly due to enhancement of its electrical and lithium-ion conductivities and stable SEI layer formation on the surface of the electrode. In the case of the un-doped silicon electrode, an unstable surface layer formed on the electrode surface, and the interfacial impedance was relatively high, resulting in high electrode polarization and poor cycling performance. 

Recently Osaka et al [260] studied a lithium/ polypyrrole secondary battery system using PEO-LiC104 as a solid polymer electrolyte. The battery showed fairly high coulombic efficiency of about 95% with an output voltage of 3.0 V and performed very well for 1400 charge-discharge cycles after initial 100 scans required to reach optimum value. However, efficiency... 

Since both neutral and reduced forms of (CH) have good stability in a battery employing lithium perchlorate in tetrahydrofuran solvent, a cell was constructed using the above polymer electrodes. It is the first stable, fully polymer, rechargeable battery with Coulombic efficiencies greater than 99%. A cell of this type, using 7% doped anode, has an open-circuit potential of 1 V and current of approximately 30 Am of (CH). ... 

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