Multilayer structure carbon material for nonaqueous secondary battery, negative electrode for nonaqueous secondary battery using the same, and nonaqueous secondary battery
A multi-layer structure, secondary battery technology, applied in the direction of battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problem of no consideration of graphite particle size, achieve small initial irreversible capacity, reduce side reactions, The effect of excellent negative electrode strength
Active Publication Date: 2018-03-06
MITSUBISHI RAYON CO LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
The literature does not give any consideration to the particle size of the graphite particles
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0428] Spheroidized natural graphite (A) was used as graphitic particles, cracked petroleum heavy oil obtained during thermal cracking of naphtha was mixed as a low-crystalline carbon precursor, and heat treatment at 1300° C. was performed in an inert gas. The obtained calcined product was pulverized and classified to obtain the negative electrode material 1 . The amount of amorphous carbon added to the obtained multilayer structure carbon material powder was 2.6% by mass.
Embodiment 2
[0430] A negative electrode material 2 was obtained in the same manner as in Example 1 except that the amount of amorphous carbon added was 1.4% by mass.
Embodiment 3
[0432] A negative electrode material 3 was obtained in the same manner as in Example 1 except that the amount of amorphous carbon added was 0.6% by mass.
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Abstract
A multilayer-structure carbon material for nonaqueous secondary batteries, which is obtained by coating at least a part of the surface of graphite particles with a carbonaceous material and satisfies the conditions (1)-(3) described below. (1) The average particle diameter (d50) of the multilayer-structure carbon material is from 19.1 mum to 50 mum (inclusive). (2) The circularity of the multilayer-structure carbon material is 0.88 or more. (3) The ratio of the rolling load (P) as defined below to the d50 of the multilayer-structure carbon material, namely P / d50, is 30 or less. P = (the linear pressure (kg / 5 cm) necessary for rolling a negative electrode active material layer using the multilayer-structure carbon material under specific conditions)
Description
technical field [0001] The present invention relates to a multilayer structure carbon material used in a nonaqueous secondary battery, a negative electrode for a nonaqueous secondary battery formed using the material, and a nonaqueous secondary battery having the negative electrode. Background technique [0002] In recent years, demand for high-capacity secondary batteries has gradually increased along with miniaturization of electronic equipment. In particular, non-aqueous secondary batteries having higher energy density and excellent high-current charge-discharge characteristics are attracting attention compared with nickel-cadmium batteries and nickel-hydrogen batteries. [0003] As negative electrode materials for non-aqueous secondary batteries, graphite materials and amorphous carbon are often used in terms of cost and durability. Moreover, in order to solve the problem that the metal in the electrode solvent is precipitated in the form of dendrites when the metal ele...
Claims
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IPC IPC(8): H01M4/587H01M4/36H01M10/0525H01M10/0566
CPCC01B32/05C01P2004/32C01P2004/61H01M4/133H01M4/1393H01M4/366H01M4/587H01M10/0525Y02E60/10H01M10/052
Inventor 山田俊介石渡信亨布施亨
Owner MITSUBISHI RAYON CO LTD