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Positive electrode active material, lithium secondary battery, and manufacture methods therefore

A positive active material and lithium secondary battery technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, electrodes, etc., can solve problems such as high output, low Li ion diffusivity, and increased internal resistance of lithium secondary batteries. Achieve the effect of high output and low internal resistance

Inactive Publication Date: 2010-09-15
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the positive electrode active material having the above-mentioned olivine structure has low Li ion diffusivity inside the active material.
In addition, due to the low Li ion diffusivity, the internal resistance of the lithium secondary battery increases, so that high output cannot be obtained.

Method used

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  • Positive electrode active material, lithium secondary battery, and manufacture methods therefore
  • Positive electrode active material, lithium secondary battery, and manufacture methods therefore
  • Positive electrode active material, lithium secondary battery, and manufacture methods therefore

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Embodiment Construction

[0038] The positive electrode active material, the lithium secondary battery, the manufacturing method for the positive electrode active material, and the manufacturing method for the lithium secondary battery of the present invention will be described below.

[0039] First, the cathode active material of the present invention will be described. The positive electrode active material of the present invention can be roughly divided into three embodiments. They are referred to as a first embodiment, a second embodiment, and a third embodiment, and will be described respectively below.

[0040] The positive electrode active material of the first embodiment is characterized in that it has an olivine structure, and the Li x m 1-x PPML 4 (where 06 The interlayer spacing of the layers is larger than that of LiMnPO as the reference material 4 MnO in 6 Layer spacing for layers.

[0041] According to the first embodiment, since the MnO in the positive active material 6 The interl...

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Abstract

The positive electrode active material of the invention has an olivine structure, and is represented by LixM1-xMnPO4 (where 0<x=1, and M is an alkali metal element that is larger in ion radius than Li), and has a construction in which the inter-layer interval of MnO6 layers in the LixM1-xMnPO4 is larger than the inter-layer interval of the MnO6 layers contained in LiMnPO4 as a reference substance.

Description

technical field [0001] The present invention relates to a positive electrode active material (active material) used in lithium secondary batteries and the like. More specifically, the present invention relates to a positive active material having an olivine structure, a lithium secondary battery, and methods for manufacturing the positive active material and the lithium secondary battery. Background technique [0002] With the trend of downsizing of personal computers, video cameras, mobile phones, etc., the field of information-related appliances and communication appliances is experiencing the practicalization and widespread application of lithium secondary batteries, of which lithium secondary batteries are due to their high energy density. are used as a power source for these appliances. Furthermore, in the field of automobiles, electric vehicles are rapidly developing due to environmental problems and resource problems. Lithium secondary batteries are also considered ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45H01M4/62H01M4/04H01M10/40H01M10/052H01M10/058
CPCH01M4/133Y02E60/122H01M4/043H01M4/5825H01M4/625H01M4/0404H01M10/0566C01B25/45H01M10/0525H01M4/621Y10T29/49108Y02E60/10Y02P70/50
Inventor 吉田淳
Owner TOYOTA JIDOSHA KK