Siloxy compound, electrolyte prepared from siloxy compound and lithium ion battery prepared from siloxy compound
A silicon oxide and compound technology, applied in the field of lithium-ion batteries, can solve the problems of battery performance deterioration, difficulty in forming interfacial film, and poor electrochemical stability of imidazole functional groups, etc., to improve long-term cycle performance, suppress side reactions, and improve the effect. Effect
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Embodiment 1
[0044] This embodiment adopts (A1) as silicon oxide compound;
[0045] Preparation of initial electrolyte: in a glove box filled with argon (H 2 O99.99%), the aprotic solvent ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate were mixed at a volume ratio of 1:1:1, and then the electrolyte lithium hexafluorophosphate was mixed at a concentration of 1mol / L Dissolved in a mixed solvent to obtain the initial electrolyte.
[0046] The silicon oxide compound in this embodiment was added to the initial electrolyte solution according to the mass fraction of 3%, 5% and 7%, respectively, to obtain the electrolyte solution.
[0047] Assembled battery: positive electrode LiNi 0.6 co 0.2 mn 0.2 The pole piece and the negative pole are made of artificial graphite pole piece, and the positive and negative pole pieces are made through processes such as slurry stirring, coating, drying, rolling, slicing, and vacuum drying, and the above-mentioned electrolyte is added to pack...
Embodiment 2
[0058] In this example, the initial electrolyte solution was prepared according to the method of Example 1, and the battery was assembled and tested according to the method of Example 1. The difference was that the silicon oxide compound in this example was (A2), and the mass fraction of the compound was 1 %, 3% and 5%. The discharge specific capacity of the battery of this embodiment at the 200th cycle is recorded in Table 1.
[0059] The reversible specific capacity of the battery prepared in this example and the battery prepared in Comparative Example 1 during long-term cycle is as follows: image 3 shown.
Embodiment 3
[0061] In this example, the initial electrolyte solution was prepared according to the method of Example 1, and the battery was assembled and tested according to the method of Example 1. The difference is that the silicon oxide compound in this example is (A3), and the mass fraction of the compound is 1 %, 3% and 5%.
[0062] The discharge specific capacity of the battery of this embodiment at the 200th cycle is recorded in Table 1.
[0063] The reversible specific capacity of the battery prepared in this example and the battery prepared in Comparative Example 1 during long-term cycle is as follows: Figure 4 shown.
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