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Lithium ion secondary battery

一种二次电池、锂离子的技术，应用在二次电池、电池、电池电极等方向，能够解决增加电极涂布量、倍率特性存在问题等问题，达到提高初期容量、增加涂布量、改善容量保持率的效果

Active Publication Date: 2016-02-10
HITACHI LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to Si, its powder resistance is 2 digits higher than that of graphite, and the rate characteristics are problematic
In addition, due to the problem of cycle life, there is no discussion on increasing the amount of electrode coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0044] Examples are described below.

[0045] As the negative electrode current collector, a copper foil with a thickness of 10 μm was used, and a negative electrode mixture material with a mass ratio of negative electrode active material, conductive auxiliary material and binder of 93:2:5 was coated on both sides to make a negative electrode. The negative electrode active material is a mixture of natural graphite and Si alloy. The X-ray diffraction (XRD) measurement results of natural graphite show that the interlayer distance d(002) of the carbon hexagonal network surface layer is 0.335nm, and the crystallite size: the stacking direction Lc(002) of the hexagonal network surface is more than 120nm, and the carbon hexagonal network surface layer is 0.335nm. The plane direction La(110) is 110 nm or more. Composition formula Si for Si alloy 70 Ti 10 Fe 10 Al 10 Said that by mixing Si with other metals, it is produced by mechanical alloying. As a binder, polyamideimide was ...

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Abstract

A lithium ion secondary battery includes: a positive electrode including a positive electrode active material; a negative electrode formed by coating a negative electrode active material mixture onto a surface of a negative electrode collector, the negative electrode active material mixture including a negative electrode active material, a conductive additive, and a binder; a separator interposed between the positive electrode and the negative electrode; and an electrolyte, in which the negative electrode active material includes graphite and an Si alloy, inequities of 0.43<=x<=9.0 and 8<=y<18 are satisfied when a mass ratio of the graphite and the Si alloy is defined as x and a coating amount of the negative electrode active material mixture is defined as y (mg / cm<2>). Thus, an initial capacity thereof can be increased and a capacity retention rate thereof can be improved in the lithium ion secondary battery which includes the Si alloy in the negative electrode.

Description

technical field [0001] The present invention relates to lithium ion secondary batteries. Background technique [0002] In recent years, lithium-ion secondary batteries have attracted attention as secondary batteries having high energy density, and research, development, and commercialization thereof have been rapidly advanced. Currently, lithium-ion secondary batteries for small consumer use such as mobile phones and notebook computers are widely used. In addition, due to problems such as global warming, fuel depletion, and the need for nuclear power plants, large-scale secondary batteries with higher capacity than conventional ones are also required as storage batteries for household, industrial, and vehicle applications. [0003] Conventionally, as a measure for increasing the capacity of lithium-ion secondary batteries, it is known to use silicon (Si) or a compound containing Si as a negative electrode material, or to increase the amount of electrode coating. However, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M10/0525
CPCH01M4/133H01M4/134H01M10/0525H01M2220/10H01M2220/20H01M2220/30H01M4/364H01M4/386H01M4/587Y02E60/10
Inventor 关荣二木村尚贵S·申
Owner HITACHI LTD
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