Conductivities of lithium bis（oxalato）borate （LiBOB）-ethyl carbonate （EC）/diethyl carbonaten （DEC） electrolytes at 25℃ and 50℃ were studied. The electrolyte component with the highest conductivity at each te...Conductivities of lithium bis（oxalato）borate （LiBOB）-ethyl carbonate （EC）/diethyl carbonaten （DEC） electrolytes at 25℃ and 50℃ were studied. The electrolyte component with the highest conductivity at each temperature was obtained through changing the concentration of LiBOB and the ratio of EC/DEC. The mass triangle model was applied to calculate the conductivity of Li- BOB-EC/DEC ternary system at 25℃ and 50℃. The results show that the calculated and experimental results have reached a good agreement. Therefore, it is expected that the experimental work can be vastly reduced by introducing the mass triangle model.展开更多
Mass triangle model was applied to lithium ion battery for electrolyte conductivity forecasting. Seven kinds of electrolytes with different proportions of 3 solvents were prepared. The solvent proportions of the seven...Mass triangle model was applied to lithium ion battery for electrolyte conductivity forecasting. Seven kinds of electrolytes with different proportions of 3 solvents were prepared. The solvent proportions of the seven electrolytes varied so as to make the seven coordinate points distribute in the ternary coordinate system to form a forcasting region by the connection of them. Their conductivities were tested and the conductivity value in the forecasting region was calculated based on the tested value by mass triangle model. Conductivity isolines formed in the region and blank area showing no forecasted value existed simultaneously. Optimized electrolyte with superior conductivity was selected according to conductivity variation trendency combined with the attention paid to the no-value-shown blank area. The conductivity of optimized electrolytefre[ethyl carbonate（EC）]：m[propylene carbonate（PC）]：m[ethylmethyl carbonate（EMC）]=0.19：0.22：0.59} was 0.745 mS/cm at-40℃, increased by a factor of 51.4% compared to 0.492 mS/cm of common electrolyte[m（EC）：m（PC）：m（EMC）=l：l：l]. The accuracy of mass triangle model was demonstrated from the perspective that the maximum value existed in the blank area, Batteries with this optimized electrolyte exhibited a better performance.展开更多
基金supported by the National Natural Science Foundation of China(No.50472093)
文摘Conductivities of lithium bis（oxalato）borate （LiBOB）-ethyl carbonate （EC）/diethyl carbonaten （DEC） electrolytes at 25℃ and 50℃ were studied. The electrolyte component with the highest conductivity at each temperature was obtained through changing the concentration of LiBOB and the ratio of EC/DEC. The mass triangle model was applied to calculate the conductivity of Li- BOB-EC/DEC ternary system at 25℃ and 50℃. The results show that the calculated and experimental results have reached a good agreement. Therefore, it is expected that the experimental work can be vastly reduced by introducing the mass triangle model.
基金Supported by the Major Project of the Basic Research and Development Program of China（No.2009CB22010）, the National Natural Science Foundation of China（No.3100021501101）, the Project of Ministry of Technology of China, the Fund of US-China Collaboration on Cutting-edge Technology Development of Electric Vehicle（No.2010DFA72760） and the Beijing Higher Institu- tion Engineering Research Center of Power Battery and Chemical Energy Materials Open Sustentation Fund, China （No. 3100012250902）.
文摘Mass triangle model was applied to lithium ion battery for electrolyte conductivity forecasting. Seven kinds of electrolytes with different proportions of 3 solvents were prepared. The solvent proportions of the seven electrolytes varied so as to make the seven coordinate points distribute in the ternary coordinate system to form a forcasting region by the connection of them. Their conductivities were tested and the conductivity value in the forecasting region was calculated based on the tested value by mass triangle model. Conductivity isolines formed in the region and blank area showing no forecasted value existed simultaneously. Optimized electrolyte with superior conductivity was selected according to conductivity variation trendency combined with the attention paid to the no-value-shown blank area. The conductivity of optimized electrolytefre[ethyl carbonate（EC）]：m[propylene carbonate（PC）]：m[ethylmethyl carbonate（EMC）]=0.19：0.22：0.59} was 0.745 mS/cm at-40℃, increased by a factor of 51.4% compared to 0.492 mS/cm of common electrolyte[m（EC）：m（PC）：m（EMC）=l：l：l]. The accuracy of mass triangle model was demonstrated from the perspective that the maximum value existed in the blank area, Batteries with this optimized electrolyte exhibited a better performance.
