Non-aqueous electrolyte considering high-temperature characteristic and normal-temperature cycle, application thereof and lithium ion battery

A non-aqueous electrolyte, lithium-ion battery technology, applied in the fields of lithium-ion batteries and non-aqueous electrolytes, can solve the problems of large growth of storage DCR, high temperature gas production, poor high temperature characteristics, etc., to reduce damage and slow down oxidative decomposition. Good reaction and stability

CN112531213AInactive Publication Date: 2021-03-19ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-03-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a non-aqueous electrolyte considering high-temperature characteristics and normal-temperature circulation, an application thereof and a lithium ion battery. Based on the totalweight, the non-aqueous electrolyte comprises the following components in percentage by mass: 70-90% of a non-aqueous organic solvent, 5-20% of electrolyte lithium salt and an additive, based on thetotal weight of the non-aqueous electrolyte, the additive comprises 0.1-2.5% of lithium difluorophosphate, 0.1-2.5% of propane sultone, 0.5-3% of lithium bis (fluorosulfonyl) imide, 0.1-1% of tetravinyl silane and 0.1-1.5% of lithium difluorobis (oxalato) phosphate. The non-aqueous electrolyte disclosed by the invention is good in stability under high voltage, relatively good in circularity, relatively small in gas production rate in the aspect of high-temperature storage and relatively small in DCR growth, and can improve the electrochemical characteristics of the lithium ion battery under high temperature and high pressure.
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Description

technical field

[0001] The invention relates to the technical field of electrical storage devices, in particular to a non-aqueous electrolytic solution that takes into account both high-temperature characteristics and normal-temperature circulation, its application, and a lithium-ion battery. Background technique

[0002] In recent years, power storage devices, especially lithium secondary batteries, have been widely used as power sources for small electronic devices such as mobile phones and notebook computers, as power sources for electric vehicles, and for power storage. Among them, in thin electronic devices such as tablet terminals and ultrabooks, as well as in some pure electric new energy vehicles, laminated batteries or prismatic batteries using laminated films such as aluminum laminated films for outer packaging components are often used. Batteries, but these batteries are thin and soft, so they are prone to deformation problems such as expansion due to the generati...

Examples

Embodiment 1

[0039] 1. Preparation of non-aqueous electrolyte:

[0040] Mix EC / EMC / DEC into a non-aqueous organic solvent in a mass ratio of about 3:5:2, and mix the non-aqueous organic solvent with 14wt% LiPF 6 After the non-aqueous solution is mixed, and relative to 100 parts by weight of the non-aqueous electrolytic solution, add 1wt% lithium difluorophosphate, 1wt% LiFSi, 1wt% DTD, 1wt% PS, 0.2wt% VC, 0.2wt% TVS, 0.5 wt ODFP to obtain a non-aqueous electrolyte. In the obtained non-aqueous electrolyte, the mass fraction of non-aqueous organic solvent is 81.1%, LiPF 6 The mass fraction is 14%.

[0041] 2. Preparation of lithium secondary battery:

[0042] Based on the total weight of the positive electrode material, 97wt% NCM (LiNi x co y mn 1-x-y o 2 , x≥0.3, y≤0.3, 1-x-y≤0.5), 2wt% carbon black as a conductive agent, and 1wt% PVDF as a binder were added to the solvent NMP to make a positive electrode mixture slurry. The positive electrode mixture slurry is coated on the positive ...

Embodiment 2

[0066] A kind of nonaqueous electrolytic solution is based on its gross weight, and is made up of the component of following mass fraction:

[0067] Non-aqueous organic solvent 90wt% (EC / EMC / DEC mass ratio is about 3:5:2), LiPF 6 8.7wt%, 0.1wt% lithium difluorophosphate, 0.5wt% LiFSi, 0.1wt% PS, 0.5wt% TVS, 0.1wt% ODFP.

Embodiment 3

[0069] A kind of nonaqueous electrolytic solution is based on its gross weight, and is made up of the component of following mass fraction:

[0070] Non-aqueous organic solvent 70wt% (EC / EMC / DEC is about 3:5:2 by mass ratio), LiPF 6 20wt%, 2.5wt% lithium difluorophosphate, 3wt% LiFSi, 2wt% PS, TVS1wt%, ODFP1.5wt%.