An electrochemical energy storage device

An energy storage device and electrochemical technology, applied in the field of electrochemistry, can solve problems such as threats to people's life and property safety, fire and explosion, and achieve the effect of improving overcharge safety performance and preventing thermal runaway

Active Publication Date: 2020-11-10
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, while lithium-ion secondary batteries benefit mankind, safety issues such as fire and explosion during charging also occur from time to time, posing a great threat to people's lives and property safety.

Method used

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  • An electrochemical energy storage device
  • An electrochemical energy storage device
  • An electrochemical energy storage device

Examples

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preparation example Construction

[0037] In the present invention, the method for preparing an electrochemical energy storage device (for example, lithium ion battery) should be known to those skilled in the art, for example, a positive electrode active material layer can generally include a positive electrode active material, a binder, a conductive agent, etc., the preparation method of the positive electrode sheet may specifically include the following steps: After forming a slurry of the bonding substance, the conductive substance and the overcharge sensitive substance, coating it on the positive electrode current collector to provide a positive electrode current collector loaded with a safety layer ; After mixing the positive electrode active material, binder and conductive agent to form a slurry, apply it on the safety layer. For another example, the negative electrode active material layer can generally include negative electrode active materials, binders, conductive agents, etc., and the preparation meth...

Embodiment 1～31

[0042] Preparation of positive electrode sheet:

[0043] Make the safety layer slurry: take the bonding material, conductive material, and overcharge sensitive material and place them in a planetary stirring tank, then add N-methylpyrrolidone (NMP) 9 times the total weight of the above materials as a dispersion solvent, and stir rapidly for 5 hour to form a uniform and stable slurry. The selection and proportioning of the selected bonding material, conductive material, and overcharge-sensitive material are shown in Table 1. The total mass of the conductive substance and the overcharge-sensitive substance is calculated, and the corresponding percentage content of each substance is the value in Table 1 × 100% (for example, 1 corresponds to 100%, and 0.35 corresponds to 35%). The overcharge sensitive substance parameters used are as follows:

[0044] For the "carbonate of glucose and sucrose mixture" in Examples 1-14 and Comparative Example 1, the ratio of sucrose to glucose is ...

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Abstract

The invention relates to the field of electrochemistry, in particular to an electrochemical energy storage device. The present invention provides an electrochemical energy storage device, comprising a positive pole piece, a negative pole piece, a separator and an electrolyte, the positive pole piece includes a positive current collector, and a positive active material located on at least one side of the positive current collector layer, and a safety layer located between the positive electrode active material layer and the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, and the safety layer includes a binding material, a conductive material, and an overcharge sensitive material; The overcharge-sensitive substance is a polymer including monosaccharide structural units and at least one of carbonate groups and phosphate groups; the electrolyte includes solvents and electrolytes, and the solvents include carbonate solvents . The electrochemical energy storage device provided by the present invention uses a safety layer including overcharge-sensitive substances, and has better reliability, thereby enabling the electrochemical energy storage device to have better safety.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an electrochemical energy storage device. Background technique [0002] Lithium-ion secondary batteries mainly rely on the back-and-forth migration of lithium ions between the positive electrode active material and the negative electrode active material for charging and discharging. Lithium-ion secondary batteries can provide stable voltage and current during use, and the use process is environmentally friendly, so they are widely used in various electrical equipment, such as mobile phones, tablet computers, notebook computers, electric bicycles, electric vehicles, etc. . However, while lithium-ion secondary batteries benefit mankind, safety problems such as fire and explosion during charging also occur from time to time, posing a great threat to people's lives and property safety. Contents of the invention [0003] In view of the above-mentioned shortcomings of the prior art,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/0525H01M4/13
CPCH01M4/13H01M10/4235H01M10/0525Y02E60/10H01M10/052H01M10/44H01M4/628H01M2004/028
Inventor 於洋
Owner CONTEMPORARY AMPEREX TECH CO
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