Negative electrode material and manufacturing method therefor, and battery and manufacturing method therefor

A negative electrode material and manufacturing method technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of difficulty in increasing rate, low specific capacity of graphite, and poor electrolyte compatibility, and achieve high conductivity, High capacity, the effect of increasing capacity

CN107302081AInactive Publication Date: 2017-10-27HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-10-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

Embodiments of the invention disclose a negative electrode material and a manufacturing method therefor, and a battery and a manufacturing method therefor. The negative electrode material comprises a carbon-containing nuclear body and a shell which coats the surface of the carbon-containing nuclear body; the shell only allows electrons and ions to pass through, wherein the theoretical capacity of the carbon-containing nuclear body for lithium ions is higher than that of the shell for lithium ions; and in a charge-discharge state, the deformation of the shell is smaller than that of the carbon-containing nuclear body, so that the battery manufactured by the negative electrode material provided by the embodiments can obtain high capacity and high conductivity as the carbon-containing nuclear body; in addition, the carbon-containing nuclear body can be isolated by the shell, so that the problems of low initial efficiency and short cycle life of the battery manufactured by the carbon-containing nuclear body caused by poor compatibility between the carbon-containing nuclear body and an electrolyte can be avoided; and the capacity of the battery is increased.
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Description

technical field

[0001] The invention relates to the technical field of batteries, in particular to a negative electrode material and a manufacturing method thereof, and a battery and a manufacturing method thereof. Background technique

[0002] Commercial lithium battery graphite anode materials have many advantages such as long cycle life, high first efficiency, low cost, environmental friendliness and easy processing, and have been widely used in portable electronic devices, electric vehicles and energy storage fields. However, graphite has low theoretical specific capacity (about 372mAh / g), poor compatibility with electrolyte, and poor rate characteristics. Although the compatibility of graphite and electrolyte has been improved through carbon coating technology, its rate performance It has been difficult to improve, and the capacity is close to the limit, making it a bottleneck for increasing battery capacity. Therefore, developing new negative electrode materials has b...

Examples

no. 1 Embodiment

[0081] In the first specific embodiment of the present invention, the manufacturing method of the negative electrode material includes:

[0082] S101: Disperse 1g of nanoscale graphene in 20ml of styrene liquid, then add styrene into 250ml of deionized water with vigorous stirring, stir and emulsify, then add 0.5g of potassium persulfate, heat up to 70°C, stir for 14 hours Stop reaction afterward, obtain the polystyrene nano-microsphere emulsion that comprises graphene, add a small amount of 50% potassium chloride solution demulsification and filter again, and wash, dry and obtain 6.5g nano-polystyrene microsphere that comprises graphene, Wherein, 0.9g sodium dodecylbenzenesulfonate and 3g sodium hydroxide have been added in advance to dissolve in the deionized water;

[0083] S102: Disperse 3g of nano-polystyrene microspheres containing graphene in 30ml of ethanol, add 0.6g of KH550 and stir evenly, then slowly add 6ml of ethanol solution dispersed with 0.6ml of tetrabutyl ti...