[HN Gopher] Sieving pores: stable,fast alloying chemistry of Si ...
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       Sieving pores: stable,fast alloying chemistry of Si -electrodes in
       Li-ion batt
        
       Author : bookofjoe
       Score  : 21 points
       Date   : 2025-05-26 16:03 UTC (4 days ago)
        
 (HTM) web link (www.nature.com)
 (TXT) w3m dump (www.nature.com)
        
       | s_tec wrote:
       | I'm not an expert, but my understanding is that silicon really
       | loves to be with lithium, which makes it a really energy-dense
       | anode material for batteries. It's also cheap and abundant. The
       | problem is that absorbing lithium causes silicon to mechanically
       | expand, which quickly destroys cell life. The anode physically
       | crumbles away with repeated charging and discharging.
       | 
       | These researchers have found a way to make a silicon electrode
       | like a sponge, which helps with the mechanical problems. Their
       | test cell has pretty "normal" degradation of 80% capacity
       | retention over 1700 cycles, which is incredibly good for silicon.
       | Normally it would be in the 10's or 100's, iirc.
        
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