摘要
石油焦碳具有无序的微晶结构。１３００℃煅烧后，其石墨化度提高甚微，而在２６００℃处理后，其石墨化度则大大提高。随着石墨化度的提高，其（００２）晶面衍射峰的半高宽减少，平均晶粒尺寸（Ｌｃ）增加。相应地，材料的比容量、充放电寿命均有很大提高。为了合理地应用石墨材料，必须仔细选用电解液。试验表明，碳酸丙烯酯溶剂含量较多的电解液会使其初充放电效率下降，而且还可能发生溶剂分子在石墨结构中的共嵌入反应。
Petroleum coke produced in Fushun also has a disordered structure with small size of the crystallities.After its calcination at 1300℃,the improvement of graphitization degree is rather small,but near 2600℃,its turbostratic disorder is easily changed into graphite with smaller half width of (002) peak and larger dimensions of crystal grain (Lc).Correspodingly,its specific energy and cyclic life are obviously increased.For better use of this synthetic graphite,the electrolytes have to be selected.Tests show that the electrolytes with more propylene carbonate solvent cause lower coulombic efficienty during the initial chargedischarge process and the cointercalation of solvent molecula in graphite structure will probably take place.
出处
《电源技术》
CAS
CSCD
北大核心
1998年第3期96-98,共3页
Chinese Journal of Power Sources
关键词
蓄电池
石油焦碳
锂电池
负极
电极
intercalation reaction,lithium ion battery,petroleum coke, synthetic graphite
