Electrolyte, preparation method thereof, lithium ion battery and lithium ion capacitor
An electrolyte and lithium salt technology, applied in the field of electrochemical energy storage, can solve the problems of inability to achieve low-temperature performance and safety performance of batteries, achieve excellent high-power characteristics, excellent low-temperature resistance characteristics and high-power characteristics, and avoid fire and explosion. Effect
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Embodiment 1
[0044] In this embodiment, the electrolyte is prepared according to the following method:
[0045] (1) Formulated ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), ethyl propionate (EP) and ethyl acetate (EA) into solvents;
[0046] (2) Add a formula amount of lithium salt to the solvent described in step (1) and mix to obtain a lithium-containing solution. The lithium salt is lithium hexafluorophosphate (LiPF 6 ) And lithium tetrafluoroborate (LiBF 4 );
[0047] (3) Add a formula amount of additives to the lithium-containing solution in step (2) and mix to obtain the electrolyte. The additives are vinylene carbonate (VC), fluoroethylene carbonate (FEC), sulfuric acid Vinyl ester (DTD) and 1,3-propane sultone (PS).
[0048] The formula of this example is shown in Table 1.
[0049] The conductivity of the electrolyte of this embodiment at room temperature (25±2°C) is shown in Table 2.
[0050] The electrolyte prepared in this embodiment is prepared into a l...
Embodiment 2
[0054] The method for preparing the electrolyte in this embodiment refers to Embodiment 1, and the difference lies in the different formulations.
[0055] The formula of this example is shown in Table 1.
[0056] The conductivity of the electrolyte of this embodiment at room temperature (25±2°C) is shown in Table 2.
[0057] The electrolyte prepared in this embodiment is prepared into a lithium ion battery, and the lithium ion battery has an explosion-proof valve. The positive and negative electrodes of the lithium-ion battery are nickel cobalt lithium manganate ternary material (NCM523) and high-rate layered carbon material. The electrolyte is prepared in this embodiment. The battery design capacity is 10Ah and the working voltage is 2.5- 4.2V.
[0058] The low-temperature performance test of the lithium ion battery prepared in this example was performed, and the test results are shown in Table 3.
[0059] The lithium ion battery prepared in this example was tested for safety against...
Embodiment 3
[0061] The method for preparing the electrolyte in this embodiment refers to Embodiment 1, and the difference lies in the different formulations.
[0062] The formula of this example is shown in Table 1.
[0063] The conductivity of the electrolyte of this embodiment at room temperature (25±2°C) is shown in Table 2.
[0064] The electrolyte prepared in this embodiment is prepared into a lithium ion capacitor. The positive and negative electrodes of the lithium ion capacitor are activated carbon materials and high-rate layered carbon materials, respectively. The electrolyte prepared in this embodiment is used, and the capacitor design capacity is 5000F , The working voltage is 2.2-3.8V.
[0065] The low-temperature performance test of the lithium ion capacitor prepared in this embodiment is performed, and the test results are shown in Table 3.
[0066] The lithium ion capacitor prepared in this embodiment was tested for safety against overcharge, and the test results are shown in Table ...
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