Electrolyte for lithium ion battery using silica-based material as negative electrode material and lithium ion battery

A technology of lithium-ion batteries and silicon-based materials, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor conductivity, low charge-discharge efficiency, and poor cycle performance of lithium-ion batteries, so as to improve life and charge Discharge efficiency and cycle performance, the effect of not easy to decompose

Active Publication Date: 2013-11-27
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing LiB(C 2 o 4 ) 2 (Lithium oxalate borate) system electrolyte, LiPF 6 (Lithium hexafluorophosphate) system electrolyte, due to its poor conductivity or the inability to form a dense SEI film on the surface of silicon-based materials, thus resulting in low charge and

Method used

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  • Electrolyte for lithium ion battery using silica-based material as negative electrode material and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0018] This embodiment provides a kind of lithium-ion battery electrolyte solution using silicon-carbon composite material as the negative electrode material, including: lithium salt LiPF 6 , non-aqueous organic solvents EC, DEC and FEC (the mass ratio of EC, DEC and FEC is EC:DEC:FEC=6:3:1), film-forming additives VC and TPFPB. Among them, LiPF 6 The concentration of VC is 1M, the content of VC is 2% of the total weight of the electrolyte, and the content of TPFPB is 5% of the total weight of the electrolyte.

[0019] The preparation method of the electrolyte is as follows: the lithium salt LiPF 6 Soluble in the mixed solvent of non-aqueous organic solvents EC, DEC and FEC, wherein the mass ratio of EC, DEC and FEC is EC:DEC:FEC=6:3:1, LiPF 6 The concentration is 1M; then add the film-forming additive VC to the solution, and then add the film-forming additive TPFPB to obtain the electrolyte. Wherein, the content of VC is 2% of the total weight of the electrolyte, and the c...

Embodiment 2

[0036] This embodiment provides a kind of electrolyte solution for lithium-ion battery with silicon material as the negative electrode material, including: lithium salt LiClO 4 , non-aqueous organic solvents EC, DEC and DMC (the mass ratio of EC, DEC and DMC is EC:DEC:DMC=4:4:2), film-forming additives VC and TPFPB. Among them, LiClO 4 The concentration is 0.5M, the content of VC is 2% of the total weight of the electrolyte, and the content of TPFPB is 2% of the total weight of the electrolyte.

[0037] The preparation method of the electrolyte is as follows: Lithium salt LiClO 4 Soluble in a mixed solvent of non-aqueous organic solvents EC, DEC and DMC, wherein the mass ratio of EC, DEC and DMC is EC:DEC:DMC=4:4:2, LiClO 4 The concentration is 0.5M; then add the film-forming additive VC to the solution, and then add the film-forming additive TPFPB to obtain the electrolyte. Wherein, the content of VC is 2% of the total weight of the electrolyte, and the content of TPFPB is...

Embodiment 3

[0041] This embodiment provides a kind of lithium-ion battery electrolyte solution using silicon-copper alloy material as the negative electrode material, including: lithium salt LiPF 6 and LiClO 4 , non-aqueous organic solvents EC, EMC and DMC (the mass ratio of EC, EMC and DMC is EC:EMC:DMC=4:3:3), film-forming additives VC, VEC and TPFPB. Among them, LiPF 6 At a concentration of 0.6M, LiClO 4 The concentration is 0.4M, the content of VC is 2% of the total weight of the electrolyte, the content of VEC is 1% of the total weight of the electrolyte, and the content of TPFPB is 4% of the total weight of the electrolyte.

[0042] The preparation method of the electrolyte is as follows: the lithium salt LiPF 6 and LiClO 4 Soluble in a mixed solvent of non-aqueous organic solvents EC, EMC and DMC, wherein the mass ratio of EC, EMC and DMC is EC:EMC:DMC=4:3:3, LiPF 6 At a concentration of 0.6M, LiClO 4 The concentration is 0.4M; then add film-forming additive VC to this soluti...

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Abstract

The invention discloses an electrolyte for a lithium ion battery using a silica-based material as a negative electrode material and the lithium ion battery. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and a film formation additive, wherein the non-aqueous organic solvent comprises ethylene carbonate; the film formation additive comprises TPFPB Tris(pentafluorophenyl) borane. The TPFPB in the electrolyte is used as the film formation additive of an SEI film, can facilitate the formation of the stable and integral SEI film on the surface of the negative electrode material, and can weaken an efflorescence phenomenon caused by a silicon volume effect when the silica-based material is used as the negative electrode material; the TPFPB can release freely moving lithium ions through the SEI film, so that part of lithium ions consumed during the formation process of the SEI film can be offset, lithium ion consumption can be lowered, and the charging and discharging efficiency and the cycle performance can be improved. The structural characteristic of the TPFPB determines that the TPFPB is relatively stable and not easy to decompose, so that the service life of the electrolyte is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte solution for lithium ion batteries and a lithium ion battery using silicon-based materials as negative electrode materials. Background technique [0002] Lithium-ion batteries have attracted people's attention because of their advantages such as high energy density and good cycle performance, and have been developed rapidly in the past two decades. Electric vehicles are mainly powered by lithium-ion batteries. With the gradual development of electric vehicles, people have put forward higher requirements for the energy density of lithium-ion batteries. The current commercial lithium-ion battery anode material uses graphite anode material, which has a low charge-discharge specific capacity and a theoretical capacity of 372mAh / g. wide range of needs. [0003] Silicon-based materials have become one of the most ideal candidate materials to r...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 朱广燕焦方方
Owner CHERY AUTOMOBILE CO LTD
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