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Lithium secondary battery and preparation method thereof

A lithium secondary battery and lithium salt technology, applied in the field of lithium secondary batteries with good high-temperature performance and its preparation, can solve the problems of poor thermal stability and chemical stability, insufficient high-temperature performance of lithium secondary batteries, etc.

Active Publication Date: 2013-03-20
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of insufficient high temperature performance of existing lithium secondary batteries, and provide a lithium secondary battery with improved high temperature performance and a preparation method thereof
The asymmetric fluorosulfonimide lithium salt can be used to completely or partially replace lithium hexafluorophosphate (LiPF), which is widely used but has many shortcomings. 6 ), can improve its poor thermal stability and chemical stability, especially for lithium secondary batteries with lithium manganese oxide as the positive electrode active material, which has a more significant high-temperature performance improvement effect

Method used

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  • Lithium secondary battery and preparation method thereof
  • Lithium secondary battery and preparation method thereof

Examples

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Embodiment 1

[0047] This embodiment is used to illustrate the non-aqueous electrolyte solution of the lithium secondary battery of the present invention and its preparation method.

[0048] At room temperature, in a glove box, dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) were mixed in a volume ratio of 5:2:3, and (fluorosulfonate Acyl)(perfluorobutylsulfonyl)imide lithium (LiFNFSI) (purchased from Suzhou Fluorite Battery Material Co., Ltd.), stir evenly, and configure the concentration of (fluorosulfonyl)(perfluorobutylsulfonyl)imide lithium A solution of 1 mol / L is the non-aqueous electrolyte of the lithium secondary battery of the present invention. For convenience of description, this non-aqueous electrolytic solution is referred to as A1. The same below.

Embodiment 2、3

[0050] This embodiment is used to illustrate the non-aqueous electrolyte solution of the lithium secondary battery of the present invention and its preparation method.

[0051] The preparation steps of Examples 2 and 3 are the same as in Example 1, except that the content of lithium (fluorosulfonyl) (perfluorobutylsulfonyl)imide accounts for 0.01wt% and 50wt% of the total weight of the non-aqueous electrolyte, respectively %, and the prepared non-aqueous electrolytic solutions are denoted as A2 and A3 respectively.

Embodiment 4

[0053] This embodiment is used to illustrate the non-aqueous electrolyte solution of the lithium secondary battery of the present invention and its preparation method.

[0054]The preparation steps of this example are the same as those of Example 1, except that an SEI film-forming accelerator vinylene carbonate (VC) is added to the non-aqueous electrolyte A1, and the content of VC accounts for 1 wt% of the total weight of the electrolyte. The non-aqueous electrolytic solution of this example is referred to as A4. It should be noted that other feasible SEI film-forming accelerators can be used here, and other functional additives, such as anti-overcharge additives, flame retardants or stabilizers, can also be added at the same time to achieve corresponding improvement purposes.

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Abstract

The invention provides a lithium secondary battery. The lithium secondary battery comprises an anode, a cathode, a nonaqueous electrolytic solution and a diaphragm between the anode and the cathode. The anode comprises at least one anode active material which can realize reversible intercalation / deintercalation of lithium ions. The cathode comprises at least one cathode active material which can realize reversible intercalation / deintercalation of lithium ions. The nonaqueous electrolytic solution comprises a lithium salt and an organic solvent. The lithium secondary battery is characterized in that the at least one anode active material is at least one of a lithium manganese oxide, a doped lithium manganese oxide and a surface-modified lithium manganese oxide; and the lithium salt is an asymmetric lithium fluorosulfimide. The invention also provides a preparation method of the lithium secondary battery.

Description

technical field [0001] The invention relates to a lithium secondary battery and a preparation method thereof, more particularly to a lithium secondary battery with good high-temperature performance and a preparation method thereof. Background technique [0002] As a new type of chemical energy, lithium secondary batteries have the characteristics of high energy density, high working voltage, long cycle life, rich raw material resources, and environmental friendliness, and have been widely used in people's production and life. Lithium secondary batteries are mainly composed of positive electrodes, negative electrodes and electrolytes that conduct lithium ions, which directly affect the performance of lithium secondary batteries. [0003] Cathode materials containing manganese, such as spinel-type LiMn 2 o 4 , which has the advantages of low raw material cost, simple synthesis process, high thermal stability, good overcharge resistance, high discharge voltage platform, etc.,...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0568H01M10/0569H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 周思思黄学杰周志彬李泓聂进韩鸿波
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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