Negative electrode, electrochemical device, and electronic apparatus

An electronic equipment, electrochemical technology, applied in the field of electrochemical devices and electronic equipment, negative electrode, can solve the problems of low capacity retention rate, low migration speed, increased battery internal resistance, etc., to achieve good lithium ion transmission capacity, improve Transmission ability, effect of improving low-temperature performance

Pending Publication Date: 2022-05-24
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Generally, lithium-ion batteries need to be used in a suitable temperature environment. If the temperature is too low (for example, below 0°C), the migration resistance in lithium-ion batteries will increase and the migration speed will decrease, resulting in the capacity of lithium-ion batterie

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  • Negative electrode, electrochemical device, and electronic apparatus
  • Negative electrode, electrochemical device, and electronic apparatus
  • Negative electrode, electrochemical device, and electronic apparatus

Examples

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Example Embodiment

[0054] Example 1

[0055] This embodiment provides a negative electrode, the negative electrode includes a current collector and a negative electrode active material layer disposed on the surface of the current collector, the current collector is a copper foil, and the negative electrode active material layer includes a negative electrode active material, a conductive agent and binder, the mass ratio of negative active material, binder and conductive agent is 96.2:3.3:0.5.

[0056] The negative active material includes a first active material and a second active material, the first active material is artificial graphite, the second active material is hard carbon, the mass ratio of artificial graphite and hard carbon is 9:1, and the binder is Including a first binder and a second binder, the first binder is lithium carboxymethyl cellulose, and the second binder is a styrene-acrylic emulsion, lithium carboxymethyl cellulose and a styrene-acrylic emulsion The mass ratio is 1.5:1.8,

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Abstract

The invention provides a negative electrode, an electrochemical device and electronic equipment, the negative electrode comprises a negative electrode active material layer, the negative electrode active material layer comprises at least two types of negative electrode active materials and at least two types of binders, and the at least two types of binders comprise carboxymethyl cellulose lithium. The negative electrode disclosed by the invention has good low-temperature performance, and the electrochemical device prepared by adopting the negative electrode has relatively high capacity retention ratio at 0 DEG C and-20 DEG C.

Description

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Claims

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Application Information

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Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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