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A combined electrolyte and high specific energy silicon-based lithium ion battery containing the combined electrolyte

A lithium-ion battery, electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as failure to achieve results, and achieve the effects of avoiding negative effects, improving safety, and improving overall performance

Active Publication Date: 2020-07-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • A combined electrolyte and high specific energy silicon-based lithium ion battery containing the combined electrolyte
  • A combined electrolyte and high specific energy silicon-based lithium ion battery containing the combined electrolyte
  • A combined electrolyte and high specific energy silicon-based lithium ion battery containing the combined electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Preparation of Electrolyte 1 and Experimental Battery 1

[0026] (1) Preparation of positive electrode sheet

[0027] Mix the positive electrode active material NMC811 ternary material, conductive agent acetylene black, and binder polytetrafluoroethylene according to the mass ratio NMC811: acetylene black: polytetrafluoroethylene = 95:2.5:2.5, add N-methylpyrrolidone, fully Stir and mix to form a uniform positive electrode slurry, which is evenly coated on a 15-micron thick aluminum foil, and dried to obtain a positive electrode sheet.

[0028] (2) Negative sheet preparation

[0029] Negative electrode active material silicon oxide-graphite (SiO-C) negative electrode material, conductive agent acetylene black, binder styrene-butadiene rubber, thickener sodium carboxymethyl cellulose according to the mass ratio of silicon-based negative electrode material: acetylene black: butadiene Styrene rubber: thickener = 95:2:2:1 for mixing, add deionized water, stir and mix well...

Embodiment 2

[0037]The preparation of combined electrolyte 2 and experimental battery 2 is basically the same as the preparation process of combined electrolyte 1 and experimental battery 1 in Example 1, the only difference is that in step (3) component A is added to account for the entire combined electrolytic Liquid quality 10% fluoroethylene carbonate (FEC), 2% ethylene carbonate (VC); Component B adds trimethylsilane phosphite (TMSPi) accounting for 5% of the entire combined electrolyte mass; In part C, add cyclohexylbenzene (CHB) accounting for 5% of the mass of the entire electrolyte.

[0038] The final high specific energy silicon-based needle-ion battery is denoted as experimental battery 2.

Embodiment 3

[0040] The preparation of combined electrolyte solution 3 and experimental battery 3 is basically the same as the preparation process of combined electrolyte solution 1 and experimental battery 1 in Example 1, the only difference is that in step (3) component A is added to account for the entire combined electrolytic solution Liquid quality 5% fluoroethylene carbonate (FEC), 2% succinic anhydride (SA); Component B added trimethylsilane borate (TMSPi) accounting for 2% of the entire combined electrolyte mass; In part C, hexafluorocyclotriphosphazene (TFPN) accounting for 2% of the mass of the entire combined electrolyte was added.

[0041] The final high specific energy silicon-based needle-ion battery is denoted as experimental battery 3.

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Abstract

The invention discloses combined type electrolyte and a high specific energy silicon-based lithium ion battery containing the combined type electrolyte. The combined type electrolyte is prepared froma component A, a component B and a component C, wherein the component A is electrolyte containing a negative pole film formation additive, the component B is electrolyte containing a positive pole film formation additive, the component C is electrolyte containing a safe additive, and the component A, the component B and the component C are sequentially and respectively injected into a battery body. According to the combined type electrolyte disclosed by the invention, by aiming at different film formation characteristics of a positive pole material and a negative pole material in formation andelectrolyte safety in a use process, different electrolyte additive component design is performed, so that mutual interference between the positive pole film formation additive and the negative polefilm formation addition in a film formation process is avoided; meanwhile, side effects of safe additives to an additive film formation process and electrochemical performance are avoided; thus, safety of the high specific energy silicon-based battery is improved, and the high specific energy silicon-based battery can show more excellent electrochemical performance of capacity, circulation and thelike at the same time.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a combined electrolyte and a high specific energy silicon-based lithium ion battery containing the combined electrolyte. Background technique [0002] With the wide application of power lithium-ion batteries, higher and higher requirements are put forward for its energy density, cycle life and safety performance, and it is necessary to continuously develop new high-energy-density battery systems. Ternary positive electrode materials and silicon-based negative electrode materials have become the best choice for the next generation of new high specific energy battery systems due to their extremely high gram capacity and higher working voltage platform after matching each other. However, in order to overcome the structural instability of electrode materials, especially the expansion problem of silicon-based negative electrodes, and to form a better solid-state electrol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 梁大宇包婷婷高田慧张健
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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