Electrochemical performance of Li2MSiO4 (M=transition metal) Synthesized by Microwave Assisted Sol-Gel Process with Surface Modification
- Electrochemical performance of Li2MSiO4 (M=transition metal) Synthesized by Microwave Assisted Sol-Gel Process with Surface Modification
- 최전진; 임원빈; 장원영; 조병원; 김종학; 정경윤
- lithium orthosilicate; cathode
- Issue Date
- 10th Spring Meeting of the International Society of Electrochemistry
- , 119-119
- Lithium orthosilicate, Li2MSiO4 (M=Fe, Mn, Co and Ni), have recently attracted the
attention of researchers due to high theoretical capacities (>300 mAhg-1) via extraction
of more than one Li+ ion per formula unit and high thermal stability through strong Si-
O bonding. Although the theoretical capacity is quite high, practical capacities
achievable at reasonable cut-off voltages are not as much as expected. Major reasons
for the poor performance of the lithium orthosilicate are poor electronic conductivity
(<10-14 S cm-1 at RT) and ionic diffusivity causing a huge polarization during chargedischarge.
When LiFePO4 was introduced as a cathode material for lithium ion batteries, it
experienced the similar situation that its electrochemical performance is very poor due
to low electronic conductivity. The low electronic conductivity problem of LiFePO4
was later alleviated by doping with metal ions and coating with carbon. In the present
contribution we partly adopted a strategy of carbon coating which was effective on
LiFePO4 to improve the electrochemical performance of Li2MSiO4 (M=transition
metal). In addition to the carbon coating we tried to control the particle size distribution
using microwave assisted sol-gel process. A detailed study on the influence of surface
modification and synthesis routes of microwave assisted sol-gel process on the
electrochemical performance of Li2MnSiO4 will be presented.
The main focus of this contribution will be the improvement of the electrochemical
performance of Li2MSiO4 by combining the high discharge capacity of Li2MnSiO4
with the good cycling stability of Li2FeSiO4. Li2(Mn1-xFex)SiO4 cathode materials have
been synthesized via microwave assisted sol-gel method and high energy ball milling.
Its structural variations during charging and discharging as well as its electrochemical
performances will be discussed in detail at the meeting.
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