Novel borate solvent for lithium-ion secondary battery
A secondary battery and lithium-ion technology, applied in the field of electrochemical and chemical power supply products, can solve the problems of flammable safety, low flash point, and restrictions on the large-scale application of lithium-ion batteries, and achieve the effect of small cycle
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Embodiment 1
[0019] In a glove box filled with argon gas, the borate solvent of the present invention is used to prepare an electrolyte, the lithium salt used is LiTFSI, the concentration of LiTFSI in the electrolyte is 1M, and the borate compound used is tri( Ethoxyethylene) borate, the specific structure is as follows:
[0020]
Embodiment 2
[0022] MCMB / Li 2016 button cells were assembled in a glove box filled with argon gas, using the electrolyte prepared from the new solvent described in Example 1, the charge and discharge voltage range was 0-3 V, and the current density was 40 mA / g. The test results are attached by figure 2 It can be seen that for the MCMB anode, the charging specific capacity in the first week is 296 mAh / g (the Coulombic efficiency is 63% in the first week), the charging specific capacity after 100 cycles is 181 mAh / g, and the capacity retention rate is 61%. Compared with the performance of the blank electrolyte of Comparative Example 1 in the electrolyte prepared by the novel solvent used for the MCMB electrode, there is a large difference, indicating that the electrolyte using the novel solvent has poor compatibility with the negative electrode. but from attached image 3 It can be seen that the cyclic voltammetry stability of the MCMB electrode in the borate electrolyte containing film-fo...
Embodiment 3
[0024] Assembling LiFePO in an argon-filled glove box 4 / Li 2016 button battery, using the electrolyte prepared by the new solvent described in Example 1, the charge and discharge voltage range is 3-4 V, and the current density is 40 mA / g. The test results are attached by image 3 Visible, for LiFePO 4 For the positive electrode, the discharge specific capacity in the first week is 103 mAh / g (coulombic efficiency is 74% in the first week), and after 100 cycles, the discharge specific capacity is 107 mAh / g, the capacity has basically no decay, but the capacity is relatively low, indicating that the use of Electrolyte prepared by new solvent for LiFePO 4 The performance of the positive electrode has a certain influence.
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