14watt 6v solar panel feeding to a TP4056 based charger for charging a Li-ion battery
The maximum input voltage is 8 V (acc. to p. 2 of the datasheet), so the open circuit voltage of your solar panel has to be lower.

The current will be limited by the charger. The maximum current you could achieve is 1 A (for \$R_\mathrm{prog} = 1.2k\$). 

As far as I can see, there won't be any problem with connecting the solar panel to the charger as you don't exceed its limits.

But i see another problem in your use case. If the output power of the solar panel is dropping due to lower solar radiation (e.g., clouds), the charger's input voltage may drop rapidly if it tries to draw too much current.
It has an under voltage lockout which should terminate the charging process in this case. As soon as the charging process is terminated, the input voltage of the charger will rise again as the current is around 0 A (open circuit voltage of the solar panel).
This means the charger will start charging again, which leads to an oscillation of charging/not charging.