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Negative electrode for rechargeable lithium battery and rechargeable lithium battery including same

A lithium battery and recharging technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of poor impregnation of electrodes and poor battery performance.

Inactive Publication Date: 2015-11-25
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poor impregnation of electrodes can subsequently degrade battery performance such as cycle life

Method used

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  • Negative electrode for rechargeable lithium battery and rechargeable lithium battery including same
  • Negative electrode for rechargeable lithium battery and rechargeable lithium battery including same
  • Negative electrode for rechargeable lithium battery and rechargeable lithium battery including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 6 and comparative example 1 to 5

[0109] In the weight ratio provided in the following table 1, graphite, carboxymethyl cellulose (sodium carboxymethyl cellulose, CMC-Na) with the weight average molecular weight and the degree of substitution provided in the following table 1 and the Styrene-butadiene rubber (SBR) provided with an average particle diameter (D50) was added to water as a solvent to prepare a slurry. This slurry was coated on copper foil and dried, then rolled to produce negative electrodes with the loading levels provided in Table 1 below.

[0110] With the weight ratio of 97.5:1.25:1.25 LiCoO 2 , polyvinylidene fluoride (PVdF) and carbon black were added to N-methylpyrrolidone (NMP) as a solvent to prepare a slurry. The slurry was coated on an aluminum (Al) thin film and dried, followed by rolling to manufacture a positive electrode.

[0111] Ethylene carbonate, ethylmethyl carbonate, and dimethyl carbonate were mixed at a volume ratio of 2:4:4, and 1.15M LiPF6 was added to the mixed solvent ...

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Abstract

Disclosed herein is a negative electrode for a rechargeable lithium battery including a negative active material and a binder, wherein the binder includes carboxylmethyl cellulose and a styrene-butadiene rubber, and the carboxylmethyl cellulose has a weight average molecular weight of about 300,000 g / mol to about 500,000 g / mol, and a rechargeable lithium battery including the same.

Description

technical field [0001] The technology described herein generally relates to rechargeable lithium batteries. Background technique [0002] Lithium rechargeable batteries have recently attracted attention as power sources for small portable electronic devices and using organic electrolytes. A lithium battery can have a discharge voltage twice that of a conventional battery using an alkaline aqueous solution or higher, and thus has a high energy density. [0003] For cathode active materials for rechargeable lithium batteries, lithium-transition metal oxides with structures capable of intercalating lithium ions, such as LiCoO 2 , LiMn 2 o 4 、LiNi 1-x co x o 2 (0<x<1) etc. For negative electrode active materials, various carbon-based materials that can intercalate and deintercalate lithium ions, such as artificial graphite, natural graphite, and hard carbon, are generally used. [0004] The electrode may be formed by coating a slurry in which an active material, a ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/622H01M10/052H01M4/134H01M10/0568H01M10/0569H01M2004/027H01M2220/30H01M2300/0028Y02E60/10
Inventor 张云硕文桢基金侑贤高永山
Owner SAMSUNG SDI CO LTD