Electrochemical Properties of the Mesocarbon Microbeads (MCMBs) in an All-solid-state Electrochemical Cell by use of the Amorphous Solid Electrolyte Li<sub>3</sub>PS<sub>4 </sub>

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  • 非晶質Li<sub>3</sub>PS<sub>4 </sub>を固体電解質として用いた電気化学セルにおける炭素系負極材料(MCMB) の電気化学的特性
  • 非晶質Li₃PS₄を固体電解質として用いた電気化学セルにおける炭素系負極材料(MCMB)の電気化学的特性
  • ヒショウシツ Li ₃ PS ₄ オ コタイ デンカイシツ ト シテ モチイタ デンキ カガク セル ニ オケル タンソケイ フキョク ザイリョウ(MCMB)ノ デンキ カガクテキ トクセイ
  • Electrochemical Properties of the Mesocarbon Microbeads (MCMBs) in an All-solid-state Electrochemical Cell by use of the Amorphous Solid Electrolyte Li3PS4

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Abstract

Electrochemical properties of the mesocarbon microbeads (MCMBs) were investigated as anode active materials for an all-solid-state cell in which amorphous Li3PS4 (a – Li3PS4) was used as solid electrolytes and Li – In alloy was used as a counter electrode. The amount of Li+ ions that were inserted into the MCMBs denoted as x in the notation LixC6 (0 < x < 1). X-ray diffraction measurements suggested that Li+ ions were inserted into the disordered portions of MCMBs at the initial reaction stage with the composition range of 0 < x < 0.13. After the initial reaction stage, Li+ ions were intercalated into the graphite layers of MCMBs in the composition range of 0.13 < x < 0.91. The Li+ ions inserted into the disordered portions of MCMBs could not be extracted in the discharge process and then caused the irreversible capacity of the first charge-discharge cycle. On the other hand, Li+ ions that were intercalated into the graphite layers can be reversibly deintercalated in the composition range of 0.13 < x < 0.91. The charge-discharge capacity of the MCMBs was gradually decreased with an increase in the cycle number. Raman spectroscopy suggested that the capacity fading during the charge-discharge cycles would be caused by the deterioration of the MCMBs’ crystallinity.

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