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Non-aqueous electrolyte and lithium ion battery
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A non-aqueous electrolyte and non-aqueous solvent technology, applied in the direction of non-aqueous electrolyte storage battery, electrolyte storage battery manufacturing, secondary battery, etc., can solve the problems of high cost, deterioration of cycle performance, etc., to reduce impedance, improve cycle performance, improve The effect of conduction
Pending Publication Date: 2022-04-05
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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Problems solved by technology
Although this technical solution claims to be able to improve the discharge specific capacity of lithium iron phosphate batteries at high temperature and low temperature at the same time, the inventors found that this method will deteriorate the cycle performance, and the electrolyte uses expensive lithium salts as electrolytes, which has a high cost
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Embodiment 1
[0099] Embodiment 1, the preparation of non-aqueous electrolyte
[0100] Prepare a non-aqueous solvent according to the ratio of EC:EMC:DMC 3:4:3, and then dissolve LiPF6, VC, FEC, DTD, TMSP, and VEC in the non-aqueous solvent to prepare a non-aqueous electrolyte.
[0101] Relative to the total mass of the non-aqueous electrolyte, the mass percentage of the above-mentioned LiPF6 is 14%, the mass percentage of VC is 1.5%, the mass percentage of FEC is 1%, and the mass percentage of DTD is 0.5%. , the mass percentage of TMSP is 0.5%, and the mass percentage of VEC is 0.1%.
Embodiment 2
[0102] Embodiment 2, the preparation of non-aqueous electrolyte
[0103] Prepare a non-aqueous solvent according to the ratio of EC:EMC:DMC 3:4:3, and then dissolve LiPF6, VC, FEC, DTD, TMSP, and VEC in the non-aqueous solvent to prepare a non-aqueous electrolyte.
[0104] Relative to the total mass of the non-aqueous electrolyte, the mass percentage of the above-mentioned LiPF6 is 14%, the mass percentage of VC is 3%, the mass percentage of FEC is 0.5%, and the mass percentage of DTD is 0.5%. , the mass percentage of TMSP is 0.1%, and the mass percentage of VEC is 0.5%.
Embodiment 3
[0105] Embodiment 3, the preparation of non-aqueous electrolyte
[0106] Prepare a non-aqueous solvent according to the ratio of EC:EMC:DMC 3:4:3, and then dissolve LiPF6, VC, FEC, DTD, TMSP, and VEC in the non-aqueous solvent to prepare a non-aqueous electrolyte.
[0107] Relative to the total mass of the non-aqueous electrolyte, the mass percentage of LiPF6 is 14%, the mass percentage of VC is 2.5%, the mass percentage of FEC is 0.5%, and the mass percentage of DTD is 0.5%. , the mass percentage of TMSP is 0.5%, and the mass percentage of VEC is 0.3%.
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Abstract
The invention discloses a non-aqueous electrolyte and a lithiumion battery. In the application, the non-aqueous electrolyte comprises a non-aqueous solvent, an electrolyte and an additive, the additives comprise at least two of fluoroethylene carbonate (FEC), vinylene carbonate (VC), tri (trimethylsilane) phosphate (TMSP) and vinyl ethylenecarbonate (VEC). The non-aqueous electrolyte provided by the invention is beneficial to accelerating desolvation of lithium ions on the surface of a negative electrode, and the impedance of a battery cell can be remarkably reduced; liF can be easily generated on the surface of the negative electrode, a compact SEI film can be formed, conduction of lithium ions is improved, and therefore the cycle performance of the battery cell is remarkably improved; while the low-temperature performance of the battery is considered, the high-temperature circulation and storage performance of the battery cell can be improved.
Description
technical field [0001] The invention and the field of secondary batteries particularly relate to non-aqueous electrolytes and lithium ion batteries. Background technique [0002] In recent years, with the gradual shortage of traditional energy sources, new energy electric vehicles and energy storage businesses have shown rapid growth. Among them, as one of the main technical routes of the battery chemical system, lithium iron phosphate materials rely on lower costs, wider sources, High security features occupy a high market share. However, the lithium iron phosphate material itself has low conductivity, high impedance, and poor kinetics at low temperatures, resulting in very poor performance when used in winter. [0003] In the prior art, attempts have been made to improve the composition of the electrolyte to improve the low-temperature performance of the battery, such as adding carboxylate additives to the electrolyte. However, although this method can improve the impeda...
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Application Information
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