Research progress on soft-hard carbon negative electrode materials for sodium-ion batteries
Sodium-ion batteries have attracted widespread attention in recent years because of their lack of resource con-straints and relatively low cost,and have a similar working principle to lithium-ion batteries,which have the potential to play an important role in the field of large-scale energy storage.As a key component of sodium-ion battery,the structure of nega-tive electrode material directly affects the performance of the battery.Therefore,this paper introduces carbon-based anode materials for sodium-ion batteries,including soft carbon,hard carbon and soft-hard carbon,from the aspects of basic con-cept,structural characteristics,performance advantages and sodium storage mechanism,and elaborates the shortcomings of soft carbon and hard carbon respectively and the improvement methods.The research status and preparation methods of soft and hard carbon composite materials with advantages of both soft carbon and hard carbon are summarized in detail.The ap-plication potential of soft and hard carbon materials in the field of negative electrode materials for sodium-ion batteries is al-so pointed out.
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