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Negative electrode material, lithium secondary battery, and method for producing negative electrode material

A negative electrode material and metal technology, applied in the field of negative electrode materials, can solve the problems of large volume change, negative electrode damage, internal resistance increase, etc., and achieve the effect of improving cycle characteristics

Active Publication Date: 2015-06-03
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When an active material containing Si or Sn is used for the negative electrode, the volume change caused by the expansion and contraction of the active material generated during the insertion and desorption reaction of lithium is large, so there is a problem that the negative electrode is damaged with the repetition of charging and discharging. The damage is serious, and the electrical contact between the negative electrode and the collector is prone to decrease or the internal resistance increase caused by the interruption of the conductive path in the negative electrode

Method used

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  • Negative electrode material, lithium secondary battery, and method for producing negative electrode material
  • Negative electrode material, lithium secondary battery, and method for producing negative electrode material
  • Negative electrode material, lithium secondary battery, and method for producing negative electrode material

Examples

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Embodiment

[0099] Hereinafter, an Example is shown, and this invention is demonstrated more concretely.

Synthetic example 1

[0101] (synthesis of reactants)

[0102] First, prepare bismuth oxide (Bi 2 o 3 ), polyacrylic acid with a number average molecular weight of 250,000, and water as starting materials. 28 g of polyacrylic acid was dissolved in 2800 ml of water, and 31 g of bismuth oxide was added to prepare a reaction liquid. Next, the reaction liquid was stirred at 80° C. for 3 days, the reaction liquid was concentrated, and then dried under reduced pressure at 120° C. to obtain 58 g of a reaction product.

Synthetic example 2

[0104] First, tin oxide (SnO), polyacrylic acid having a number average molecular weight of 250,000, and water were prepared as starting materials. 28 g of polyacrylic acid was dissolved in 2800 ml of water, and 27 g of tin oxide was further added to prepare a reaction liquid. Next, the reaction solution was stirred for 4 days while being heated to reflux under argon gas, the reaction solution was concentrated, and then dried under reduced pressure at 120° C. to obtain 54 g of a reaction product.

[0105] [Evaluation 1]

[0106] (X-ray diffraction measurement)

[0107] The reactants obtained in Synthesis Example 1 and Synthesis Example 2 were subjected to X-ray diffraction (XRD) measurement. The results are shown in the image 3 and Figure 4 . In addition, bismuth oxide (Bi 2 o 3 ) and tin oxide (SnO) for XRD determination. The results are shown in the Figure 5 and Figure 6 .

[0108] Such as Figure 5 As shown, in Bi 2 o 3 In the XRD measurement results, mult...

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Abstract

The main object of the present invention is to provide an anode material capable of improving cycling characteristics of a lithium secondary battery. The present invention solves the problem by providing an anode material comprising a reactant between: a metal oxide represented by a general formula of MxOy (M is a metal) or a metal represented by a general formula of M, which causes an alloying reaction or a conversion reaction with Li, and a polymer compound having an acid group in a side chain.

Description

technical field [0001] The present invention relates to a negative electrode material capable of improving cycle characteristics of a lithium secondary battery. Background technique [0002] In recent years, with the rapid spread of information-related equipment such as personal computers, video cameras, and mobile phones, and communication equipment, etc., the development of batteries used as their power sources has attracted attention. In addition, in the automotive industry and the like, development of high-output and high-capacity batteries for use in electric vehicles or hybrid vehicles is also underway. At present, among various batteries, lithium secondary batteries attract attention from the viewpoint of high energy density. [0003] As negative electrode active materials for lithium secondary batteries, materials containing Si or Sn having a higher theoretical capacity than carbon have been studied. When an active material containing Si or Sn is used for the negat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/36H01M4/38H01M4/60
CPCH01M4/38H01M4/387H01M4/48H01M4/5825H01M4/604H01M10/052Y02E60/10H01M4/60H01M4/13Y02T10/70
Inventor 山口裕之
Owner TOYOTA JIDOSHA KK